Full Code of cketti/EmailIntentBuilder for AI

Repository: cketti/EmailIntentBuilder
Branch: master
Commit: 137148deee5e
Files: 27
Total size: 55.3 KB

Directory structure:
gitextract_qxd252kg/

├── .github/
│   ├── FUNDING.yml
│   └── workflows/
│       └── android.yml
├── .gitignore
├── LICENSE
├── README.md
├── android-mvn-push.gradle
├── build.gradle
├── gradle/
│   └── wrapper/
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradle.properties
├── gradlew
├── gradlew.bat
├── library/
│   ├── .gitignore
│   ├── build.gradle
│   └── src/
│       ├── main/
│       │   ├── AndroidManifest.xml
│       │   └── java/
│       │       └── de/
│       │           └── cketti/
│       │               └── mailto/
│       │                   └── EmailIntentBuilder.java
│       └── test/
│           └── java/
│               └── de/
│                   └── cketti/
│                       └── mailto/
│                           └── EmailIntentBuilderTest.java
├── sample/
│   ├── .gitignore
│   ├── build.gradle
│   └── src/
│       └── main/
│           ├── AndroidManifest.xml
│           ├── java/
│           │   └── de/
│           │       └── cketti/
│           │           └── mailto/
│           │               └── sample/
│           │                   └── MainActivity.java
│           └── res/
│               ├── layout/
│               │   └── activity_main.xml
│               ├── menu/
│               │   └── activity_main.xml
│               └── values/
│                   ├── dimens.xml
│                   ├── strings.xml
│                   └── styles.xml
└── settings.gradle

================================================
FILE CONTENTS
================================================

================================================
FILE: .github/FUNDING.yml
================================================
github: cketti


================================================
FILE: .github/workflows/android.yml
================================================
name: Android CI

on: [push]

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
    - name: set up JDK 1.8
      uses: actions/setup-java@v1
      with:
        java-version: 1.8
    - name: Build with Gradle
      run: ./gradlew build


================================================
FILE: .gitignore
================================================
.gradle
/local.properties
/.idea/
.DS_Store
/build
*.iml


================================================
FILE: LICENSE
================================================

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================================================
FILE: README.md
================================================
# Email Intent Builder

[![Maven Central](https://maven-badges.herokuapp.com/maven-central/de.cketti.mailto/email-intent-builder/badge.svg)](https://maven-badges.herokuapp.com/maven-central/de.cketti.mailto/email-intent-builder)

An Android Library for the creation of [SendTo](https://developer.android.com/reference/android/content/Intent.html#ACTION_SENDTO) Intents with [mailto:](https://tools.ietf.org/html/rfc6068) URI

Read the article [Android: Sending Email using Intents](https://medium.com/@cketti/android-sending-email-using-intents-3da63662c58f) if you want to learn what motivated the creation of this library.


## Include the library

Add this to your `dependencies` block in `build.gradle`:

```groovy
implementation 'de.cketti.mailto:email-intent-builder:2.0.0'
```


## Usage

Creating a simple email intent is as easy as this:

```java
Intent emailIntent = EmailIntentBuilder.from(activity)
        .to("alice@example.org")
        .subject("Feedback")
        .build();
```

This will build an intent with the action `android.intent.action.SENDTO` and the data
`mailto:alice@example.org?subject=Feedback`.


You can also use `EmailIntentBuilder` to add a couple of other fields and directly launch the intent:

```java
EmailIntentBuilder.from(activity)
        .to("alice@example.org")
        .cc("bob@example.org")
        .bcc("charles@example.org")
        .subject("Message from an app")
        .body("Some text here")
        .start();
```


## Changelog

**Version 2.0.0 (2019-11-26)**
- Use `org.jetbrains:annotations` for nullability annotations
- No functional changes

**Version 1.0.0 (2015-12-19)**
- Initial release

## License

    Copyright 2015-2019 cketti

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


================================================
FILE: android-mvn-push.gradle
================================================
if (!(hasProperty("nexusUsername") && hasProperty("nexusPassword"))) {
    return
}

apply plugin: 'maven'
apply plugin: 'signing'

afterEvaluate { project ->
    project.version = android.defaultConfig.versionName
    project.group = project.pom.group

    uploadArchives {
        repositories {
            mavenDeployer {
                beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }

                pom.artifactId = project.pom.artifactId

                repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
                    authentication(userName: nexusUsername, password: nexusPassword)
                }
                snapshotRepository(url: "https://oss.sonatype.org/content/repositories/snapshots") {
                    authentication(userName: nexusUsername, password: nexusPassword)
                }

                pom.project {
                    name project.pom.name
                    packaging 'aar'
                    description project.pom.description
                    url project.pom.url

                    scm {
                        url project.pom.scmUrl
                        connection project.pom.scmConnection
                        developerConnection project.pom.scmDevConnection
                    }

                    licenses {
                        license {
                            name project.pom.licenseName
                            url project.pom.licenseUrl
                            distribution project.pom.licenseDist
                        }
                    }

                    developers {
                        developer {
                            id project.pom.developerId
                            name project.pom.developerName
                        }
                    }
                }
            }
        }
    }

    signing {
        required { gradle.taskGraph.hasTask("uploadArchives") }
        sign configurations.archives
    }

    task androidJavadocs(type: Javadoc) {
        source = android.sourceSets.main.java.srcDirs
        classpath += project.files(android.getBootClasspath().join(File.pathSeparator))

        options {
            linksOffline "http://d.android.com/reference", "${android.sdkDirectory}/docs/reference"
        }
    }

    task androidJavadocsJar(type: Jar, dependsOn: androidJavadocs) {
        classifier = 'javadoc'
        from androidJavadocs.destinationDir
    }

    task androidSourcesJar(type: Jar) {
        classifier = 'sources'
        from android.sourceSets.main.java.srcDirs
    }

    artifacts {
        archives androidSourcesJar
        archives androidJavadocsJar
    }
}


================================================
FILE: build.gradle
================================================
buildscript {
    repositories {
        mavenCentral()
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.2'
    }
}

allprojects {
    repositories {
        mavenCentral()
        google()
        jcenter()
    }
}


================================================
FILE: gradle/wrapper/gradle-wrapper.properties
================================================
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists


================================================
FILE: gradle.properties
================================================
# Project-wide Gradle settings.

# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.

# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html

# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
# Default value: -Xmx10248m -XX:MaxPermSize=256m
# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true
android.enableJetifier=true
android.useAndroidX=true


================================================
FILE: gradlew
================================================
#!/usr/bin/env sh

#
# Copyright 2015 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

##############################################################################
##
##  Gradle start up script for UN*X
##
##############################################################################

# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
    ls=`ls -ld "$PRG"`
    link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '/.*' > /dev/null; then
        PRG="$link"
    else
        PRG=`dirname "$PRG"`"/$link"
    fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null

APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`

# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'

# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"

warn () {
    echo "$*"
}

die () {
    echo
    echo "$*"
    echo
    exit 1
}

# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
  CYGWIN* )
    cygwin=true
    ;;
  Darwin* )
    darwin=true
    ;;
  MINGW* )
    msys=true
    ;;
  NONSTOP* )
    nonstop=true
    ;;
esac

CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar

# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD="$JAVA_HOME/jre/sh/java"
    else
        JAVACMD="$JAVA_HOME/bin/java"
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
else
    JAVACMD="java"
    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi

# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
    MAX_FD_LIMIT=`ulimit -H -n`
    if [ $? -eq 0 ] ; then
        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
            MAX_FD="$MAX_FD_LIMIT"
        fi
        ulimit -n $MAX_FD
        if [ $? -ne 0 ] ; then
            warn "Could not set maximum file descriptor limit: $MAX_FD"
        fi
    else
        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
    fi
fi

# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi

# For Cygwin or MSYS, switch paths to Windows format before running java
if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
    JAVACMD=`cygpath --unix "$JAVACMD"`

    # We build the pattern for arguments to be converted via cygpath
    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
    SEP=""
    for dir in $ROOTDIRSRAW ; do
        ROOTDIRS="$ROOTDIRS$SEP$dir"
        SEP="|"
    done
    OURCYGPATTERN="(^($ROOTDIRS))"
    # Add a user-defined pattern to the cygpath arguments
    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
    fi
    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    i=0
    for arg in "$@" ; do
        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option

        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
        else
            eval `echo args$i`="\"$arg\""
        fi
        i=`expr $i + 1`
    done
    case $i in
        0) set -- ;;
        1) set -- "$args0" ;;
        2) set -- "$args0" "$args1" ;;
        3) set -- "$args0" "$args1" "$args2" ;;
        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
    esac
fi

# Escape application args
save () {
    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
    echo " "
}
APP_ARGS=`save "$@"`

# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"

exec "$JAVACMD" "$@"


================================================
FILE: gradlew.bat
================================================
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem      https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem

@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem  Gradle startup script for Windows
@rem
@rem ##########################################################################

@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal

set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%

@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome

set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto init

echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.

goto fail

:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe

if exist "%JAVA_EXE%" goto init

echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.

goto fail

:init
@rem Get command-line arguments, handling Windows variants

if not "%OS%" == "Windows_NT" goto win9xME_args

:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2

:win9xME_args_slurp
if "x%~1" == "x" goto execute

set CMD_LINE_ARGS=%*

:execute
@rem Setup the command line

set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar

@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%

:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd

:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1

:mainEnd
if "%OS%"=="Windows_NT" endlocal

:omega


================================================
FILE: library/.gitignore
================================================
/build


================================================
FILE: library/build.gradle
================================================
apply plugin: 'com.android.library'

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.3"

    defaultConfig {
        versionName "2.0.0"
        minSdkVersion 14
    }
}

dependencies {
    api 'org.jetbrains:annotations:18.0.0'

    testImplementation 'junit:junit:4.12'
    testImplementation 'org.mockito:mockito-core:2.21.0'
    testImplementation 'org.robolectric:robolectric:4.3.1'
    testImplementation 'com.squareup.assertj:assertj-android:1.2.0'
}

project.ext {
    pom = [
            group: "de.cketti.mailto",
            artifactId: "email-intent-builder",
            name: "Email Intent Builder",
            description: "An Android Library for creation of SendTo Intents with mailto: URI",
            url: "https://github.com/cketti/EmailIntentBuilder",

            scmUrl: "https://github.com/cketti/EmailIntentBuilder",
            scmConnection: "scm:git@github.com:cketti/EmailIntentBuilder.git",
            scmDevConnection: "scm:git@github.com:cketti/EmailIntentBuilder.git",

            licenseName: "The Apache Software License, Version 2.0",
            licenseUrl: "http://www.apache.org/licenses/LICENSE-2.0.txt",
            licenseDist: "repo",

            developerId: "cketti",
            developerName: "cketti"
    ]
}

apply from: '../android-mvn-push.gradle'


================================================
FILE: library/src/main/AndroidManifest.xml
================================================
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.cketti.mailto">

</manifest>


================================================
FILE: library/src/main/java/de/cketti/mailto/EmailIntentBuilder.java
================================================
/*
 * Copyright 2015-2019 cketti
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.cketti.mailto;


import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.util.Patterns;

import org.jetbrains.annotations.NotNull;


/**
 * A helper to create email intents, i.e. {@link Intent#ACTION_SENDTO} with a {@code mailto:} URI.
 *
 * <p>Example usage:</p>
 * <pre>
 * <code>
 * EmailIntentBuilder.from(activity)
 *         .to("alice@example.org")
 *         .subject("Bug report for 'My awesome app'")
 *         .body("Something went wrong :(")
 *         .start();
 * </code>
 * </pre>
 * <p>This creates an intent containing the following {@code mailto:} URI:</p>
 * <pre>
 * <code>
 * mailto:alice@example.org?subject=Bug%20report%20for%20'My%20awesome%20app'&amp;body=Something%20went%20wrong%20%3A(
 * </code>
 * </pre>
 *
 * @see #from(Context)
 */
@SuppressWarnings("WeakerAccess")
public final class EmailIntentBuilder {
    private final Context context;
    private final Set<String> to = new LinkedHashSet<>();
    private final Set<String> cc = new LinkedHashSet<>();
    private final Set<String> bcc = new LinkedHashSet<>();
    private String subject;
    private String body;


    private EmailIntentBuilder(@NotNull Context context) {
        this.context = checkNotNull(context);
    }

    /**
     * Create a builder to create an {@link Intent#ACTION_SENDTO} intent or to launch that intent.
     *
     * @param context
     *         The {@code Context} that will be used to launch the intent
     *
     * @return An email intent builder
     */
    @NotNull
    public static EmailIntentBuilder from(@NotNull Context context) {
        return new EmailIntentBuilder(context);
    }

    /**
     * Add an email address to be used in the "to" field.
     *
     * @param to
     *         the email address to add
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder to(@NotNull String to) {
        checkEmail(to);
        this.to.add(to);
        return this;
    }

    /**
     * Add a list of email addresses to be used in the "to" field.
     *
     * @param to
     *         the email addresses to add
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder to(@NotNull Collection<String> to) {
        checkNotNull(to);
        for (String email : to) {
            checkEmail(email);
        }
        this.to.addAll(to);

        return this;
    }

    /**
     * Add an email address to be used in the "cc" field.
     *
     * @param cc
     *         the email address to add
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder cc(@NotNull String cc) {
        checkEmail(cc);
        this.cc.add(cc);
        return this;
    }

    /**
     * Add an email address to be used in the "cc" field.
     *
     * @param cc
     *         the email addresses to add
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder cc(@NotNull Collection<String> cc) {
        checkNotNull(cc);
        for (String email : cc) {
            checkEmail(email);
        }
        this.cc.addAll(cc);

        return this;
    }

    /**
     * Add an email address to be used in the "bcc" field.
     *
     * @param bcc
     *         the email address to add
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder bcc(@NotNull String bcc) {
        checkEmail(bcc);
        this.bcc.add(bcc);
        return this;
    }

    /**
     * Add an email address to be used in the "bcc" field.
     *
     * @param bcc
     *         the email addresses to add
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder bcc(@NotNull Collection<String> bcc) {
        checkNotNull(bcc);
        for (String email : bcc) {
            checkEmail(email);
        }
        this.bcc.addAll(bcc);

        return this;
    }

    /**
     * Set the subject line for this email intent.
     *
     * @param subject
     *         the email subject line
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder subject(@NotNull String subject) {
        checkNotNull(subject);
        checkNoLineBreaks(subject);
        this.subject = subject;
        return this;
    }

    /**
     * Set the text body for this email intent.
     *
     * @param body
     *         the text body
     *
     * @return This {@code EmailIntentBuilder} for method chaining
     */
    @NotNull
    public EmailIntentBuilder body(@NotNull String body) {
        checkNotNull(body);
        this.body = fixLineBreaks(body);
        return this;
    }

    /**
     * Launch the email intent.
     *
     * @return {@code false} if no activity to handle the email intent could be found; {@code true} otherwise
     */
    public boolean start() {
        Intent emailIntent = build();
        try {
            startActivity(emailIntent);
        } catch (ActivityNotFoundException e) {
            return false;
        }

        return true;
    }

    private void startActivity(Intent intent) {
        if (!(context instanceof Activity)) {
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        }

        context.startActivity(intent);
    }

    /**
     * Build the {@link Intent#ACTION_SENDTO} intent.
     *
     * @return the intent containing the provided information
     */
    @NotNull
    public Intent build() {
        Uri mailtoUri = constructMailtoUri();
        return new Intent(Intent.ACTION_SENDTO, mailtoUri);
    }

    @NotNull
    private Uri constructMailtoUri() {
        StringBuilder mailto = new StringBuilder(1024);
        mailto.append("mailto:");
        addRecipients(mailto, to);

        boolean hasQueryParameters;
        hasQueryParameters = addRecipientQueryParameters(mailto, "cc", cc, false);
        hasQueryParameters = addRecipientQueryParameters(mailto, "bcc", bcc, hasQueryParameters);
        hasQueryParameters = addQueryParameter(mailto, "subject", subject, hasQueryParameters);
        addQueryParameter(mailto, "body", body, hasQueryParameters);

        return Uri.parse(mailto.toString());
    }

    private boolean addQueryParameter(StringBuilder mailto, String field, String value, boolean hasQueryParameters) {
        if (value == null) {
            return hasQueryParameters;
        }

        mailto.append(hasQueryParameters ? '&' : '?').append(field).append('=').append(Uri.encode(value));

        return true;
    }

    private boolean addRecipientQueryParameters(StringBuilder mailto, String field, Set<String> recipients,
            boolean hasQueryParameters) {
        if (recipients.isEmpty()) {
            return hasQueryParameters;
        }

        mailto.append(hasQueryParameters ? '&' : '?').append(field).append('=');
        addRecipients(mailto, recipients);

        return true;
    }

    private void addRecipients(StringBuilder mailto, Set<String> recipients) {
        if (recipients.isEmpty()) {
            return;
        }

        for (String recipient : recipients) {
            mailto.append(encodeRecipient(recipient));
            mailto.append(',');
        }

        mailto.setLength(mailto.length() - 1);
    }

    private void checkEmail(String email) {
        checkNotNull(email);

        if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
            throw new IllegalArgumentException("Argument is not a valid email address (according to " +
                    "Patterns.EMAIL_ADDRESS)");
        }
    }

    private void checkNoLineBreaks(String text) {
        boolean containsCarriageReturn = text.indexOf('\r') != -1;
        boolean containsLineFeed = text.indexOf('\n') != -1;

        if (containsCarriageReturn || containsLineFeed) {
            throw new IllegalArgumentException("Argument must not contain line breaks");
        }
    }

    @NotNull
    private static <T> T checkNotNull(T object) {
        if (object == null) {
            throw new IllegalArgumentException("Argument must not be null");
        }

        return object;
    }

    @NotNull
    static String encodeRecipient(String recipient) {
        int index = recipient.lastIndexOf('@');
        String localPart = recipient.substring(0, index);
        String host = recipient.substring(index + 1);
        return Uri.encode(localPart) + "@" + Uri.encode(host);
    }

    @NotNull
    static String fixLineBreaks(String text) {
        return text.replaceAll("\r\n", "\n").replace('\r', '\n').replaceAll("\n", "\r\n");
    }
}


================================================
FILE: library/src/test/java/de/cketti/mailto/EmailIntentBuilderTest.java
================================================
package de.cketti.mailto;


import java.util.Arrays;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;

import static org.assertj.android.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;


@RunWith(RobolectricTestRunner.class)
@Config(sdk = 28)
public class EmailIntentBuilderTest {

    @Mock
    private Context context;


    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);
    }

    @SuppressWarnings("ConstantConditions")
    @Test(expected = IllegalArgumentException.class)
    public void from_withNullArgument_shouldThrow() {
        EmailIntentBuilder.from(null);
    }

    @Test
    public void build_shouldReturnIntentWithSendToAction() {
        Intent intent = EmailIntentBuilder.from(context).build();

        assertThat(intent).hasAction(Intent.ACTION_SENDTO);
    }

    @Test
    public void build_withSingleToValue_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .to("john@example.org")
                .build();

        assertThat(intent).hasData("mailto:john@example.org");
    }

    @Test
    public void build_withListToValue_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .to(Arrays.asList("bob@example.org", "alice@example.org"))
                .build();

        assertThat(intent).hasData("mailto:bob@example.org,alice@example.org");
    }

    @Test
    public void build_withSingleCcValue_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .cc("john@example.org")
                .build();

        assertThat(intent).hasData("mailto:?cc=john@example.org");
    }

    @Test
    public void build_withListCcValue_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .cc(Arrays.asList("bob@example.org", "alice@example.org"))
                .build();

        assertThat(intent).hasData("mailto:?cc=bob@example.org,alice@example.org");
    }

    @Test
    public void build_withSingleBccValue_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .bcc("john@example.org")
                .build();

        assertThat(intent).hasData("mailto:?bcc=john@example.org");
    }

    @Test
    public void build_withListBccValue_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .bcc(Arrays.asList("alice@example.org", "bob@example.org"))
                .build();

        assertThat(intent).hasData("mailto:?bcc=alice@example.org,bob@example.org");
    }

    @Test
    public void build_withSubject_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .subject("hi there")
                .build();

        assertThat(intent).hasData("mailto:?subject=hi%20there");
    }

    @Test
    public void build_withBodyContainingImproperLineBreak_shouldReturnFixedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .body("this is\na test")
                .build();

        assertThat(intent).hasData("mailto:?body=this%20is%0D%0Aa%20test");
    }

    @Test
    public void build_withAllExtras_shouldReturnExpectedResult() {
        Intent intent = EmailIntentBuilder.from(context)
                .to(Arrays.asList("leia@example.org", "luke@example.org"))
                .cc("obi.wan@example.org")
                .cc("han@example.org")
                .bcc("chewbacca@example.org")
                .subject("rebel stuff")
                .body("start execution of secret plan & good luck")
                .build();

        assertThat(intent).hasData("mailto:" +
                "leia@example.org,luke@example.org" +
                "?cc=obi.wan@example.org,han@example.org" +
                "&bcc=chewbacca@example.org" +
                "&subject=rebel%20stuff" +
                "&body=start%20execution%20of%20secret%20plan%20%26%20good%20luck");
    }

    @Test
    public void start_fromActivity_shouldCreateIntentWithoutNewTaskFlag() {
        Activity activity = mock(Activity.class);

        EmailIntentBuilder.from(activity)
                .to("john@example.org")
                .start();

        Intent intent = getIntentFromStartActivityInvocation(activity);
        assertThat(intent).hasFlags(0);
    }

    @Test
    public void start_fromContext_shouldCreateIntentWithNewTaskFlag() {
        EmailIntentBuilder.from(context)
                .to("john@example.org")
                .start();

        Intent intent = getIntentFromStartActivityInvocation(context);
        assertThat(intent).hasFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    }

    @Test
    public void start_withoutError_shouldReturnTrue() {
        boolean success = EmailIntentBuilder.from(context).start();

        assertThat(success).isTrue();
    }

    @Test
    public void start_withActivityNotFoundException_shouldReturnFalse() {
        doThrow(new ActivityNotFoundException()).when(context).startActivity(any(Intent.class));

        boolean success = EmailIntentBuilder.from(context).start();

        assertThat(success).isFalse();
    }

    @Test
    public void encodeRecipient_withComplicatedEmailOne_shouldReturnExpectedResult() {
        String encoded = EmailIntentBuilder.encodeRecipient("\"not@me\"@example.org");

        assertThat(encoded).isEqualTo("%22not%40me%22@example.org");
    }

    @Test
    public void encodeRecipient_withComplicatedEmailTwo_shouldReturnExpectedResult() {
        String encoded = EmailIntentBuilder.encodeRecipient("\"oh\\\\no\"@example.org");

        assertThat(encoded).isEqualTo("%22oh%5C%5Cno%22@example.org");
    }

    @Test
    public void encodeRecipient_withComplicatedEmailThree_shouldReturnExpectedResult() {
        String encoded = EmailIntentBuilder.encodeRecipient("\"\\\\\\\"it's\\ ugly\\\\\\\"\"@example.org");

        assertThat(encoded).isEqualTo("%22%5C%5C%5C%22it's%5C%20ugly%5C%5C%5C%22%22@example.org");
    }

    @SuppressWarnings("ConstantConditions")
    @Test(expected = IllegalArgumentException.class)
    public void to_withNullArgument_shouldThrow() {
        EmailIntentBuilder.from(context)
                .to((String) null);
    }

    @Test(expected = IllegalArgumentException.class)
    public void to_withArgumentStartingWithAt_shouldThrow() {
        EmailIntentBuilder.from(context)
                .to("@example.org");
    }

    @Test(expected = IllegalArgumentException.class)
    public void to_withArgumentEndingInAt_shouldThrow() {
        EmailIntentBuilder.from(context)
                .to("hi@");
    }

    @Test(expected = IllegalArgumentException.class)
    public void to_withArgumentNotContainingAt_shouldThrow() {
        EmailIntentBuilder.from(context)
                .to("bob(at)example.org");
    }

    @SuppressWarnings("ConstantConditions")
    @Test(expected = IllegalArgumentException.class)
    public void subject_withNullArgument_shouldThrow() {
        EmailIntentBuilder.from(context)
                .subject(null);
    }

    @Test(expected = IllegalArgumentException.class)
    public void subject_withArgumentContainingCarriageReturn_shouldThrow() {
        EmailIntentBuilder.from(context)
                .subject("This is an important\rsubject");
    }

    @Test(expected = IllegalArgumentException.class)
    public void subject_withArgumentContainingLineFeed_shouldThrow() {
        EmailIntentBuilder.from(context)
                .subject("Keep\nreading");
    }

    @Test(expected = IllegalArgumentException.class)
    public void subject_withArgumentContainingCrLf_shouldThrow() {
        EmailIntentBuilder.from(context)
                .subject("One\r\nTwo");
    }

    @Test
    public void fixLineBreaks_withArgumentContainingCr_shouldReturnExpectedResult() {
        String result = EmailIntentBuilder.fixLineBreaks("\r2nd");

        assertThat(result).isEqualTo("\r\n2nd");
    }

    @Test
    public void fixLineBreaks_withArgumentContainingLf_shouldReturnExpectedResult() {
        String result = EmailIntentBuilder.fixLineBreaks("hi\nthere");

        assertThat(result).isEqualTo("hi\r\nthere");
    }

    @Test
    public void fixLineBreaks_withArgumentContainingCrLf_shouldReturnExpectedResult() {
        String result = EmailIntentBuilder.fixLineBreaks("line one\r\nline two");

        assertThat(result).isEqualTo("line one\r\nline two");
    }

    private Intent getIntentFromStartActivityInvocation(Context context) {
        ArgumentCaptor<Intent> argumentCaptor = ArgumentCaptor.forClass(Intent.class);
        verify(context).startActivity(argumentCaptor.capture());
        return argumentCaptor.getValue();
    }
}


================================================
FILE: sample/.gitignore
================================================
/build


================================================
FILE: sample/build.gradle
================================================
apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.3"

    defaultConfig {
        applicationId "de.cketti.mailto.sample"
        minSdkVersion 16
        targetSdkVersion 28

        versionCode 1
        versionName "1.0"
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation project(':library')
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.0.0'
}


================================================
FILE: sample/src/main/AndroidManifest.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.cketti.mailto.sample" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="de.cketti.mailto.sample.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.SEND" />
                <data android:mimeType="*/*" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>


================================================
FILE: sample/src/main/java/de/cketti/mailto/sample/MainActivity.java
================================================
package de.cketti.mailto.sample;


import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;

import androidx.appcompat.app.AppCompatActivity;
import com.google.android.material.snackbar.Snackbar;
import de.cketti.mailto.EmailIntentBuilder;


public class MainActivity extends AppCompatActivity {
    private View mainContent;
    private EditText emailTo;
    private EditText emailCc;
    private EditText emailBcc;
    private EditText emailSubject;
    private EditText emailBody;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mainContent = findViewById(R.id.main_content);
        emailTo = findViewById(R.id.email_to);
        emailCc = findViewById(R.id.email_cc);
        emailBcc = findViewById(R.id.email_bcc);
        emailSubject = findViewById(R.id.email_subject);
        emailBody = findViewById(R.id.email_body);

        findViewById(R.id.button_send_email).setOnClickListener(v -> sendEmail());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.menu_feedback) {
            sendFeedback();
        }
        return true;
    }

    private void sendFeedback() {
        boolean success = EmailIntentBuilder.from(this)
                .to("cketti@gmail.com")
                .subject(getString(R.string.feedback_subject))
                .body(getString(R.string.feedback_body))
                .start();

        if (!success) {
            Snackbar.make(mainContent, R.string.error_no_email_app, Snackbar.LENGTH_LONG).show();
        }
    }

    void sendEmail() {
        String to = emailTo.getText().toString();
        String cc = emailCc.getText().toString();
        String bcc = emailBcc.getText().toString();
        String subject = emailSubject.getText().toString();
        String body = emailBody.getText().toString();

        EmailIntentBuilder builder = EmailIntentBuilder.from(this);

        try {
            if (!TextUtils.isEmpty(to)) {
                builder.to(to);
            }
            if (!TextUtils.isEmpty(cc)) {
                builder.cc(cc);
            }
            if (!TextUtils.isEmpty(bcc)) {
                builder.bcc(bcc);
            }
            if (!TextUtils.isEmpty(subject)) {
                builder.subject(subject);
            }
            if (!TextUtils.isEmpty(body)) {
                builder.body(body);
            }

            boolean success = builder.start();
            if (!success) {
                Snackbar.make(mainContent, R.string.error_no_email_app, Snackbar.LENGTH_LONG).show();
            }
        } catch (IllegalArgumentException e) {
            String errorMessage = getString(R.string.argument_error, e.getMessage());
            Snackbar.make(mainContent, errorMessage, Snackbar.LENGTH_LONG).show();
        }
    }
}


================================================
FILE: sample/src/main/res/layout/activity_main.xml
================================================
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin">

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/email_to"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/title_to"
                android:inputType="textEmailAddress" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/email_cc"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/title_cc"
                android:inputType="textEmailAddress" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/email_bcc"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/title_bcc"
                android:inputType="textEmailAddress" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/email_subject"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/title_subject"
                android:inputType="textEmailSubject" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/email_body"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/title_body"
                android:inputType="textMultiLine"
                tools:ignore="TextFields" />
        </com.google.android.material.textfield.TextInputLayout>

        <Button
            android:id="@+id/button_send_email"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button_label_send_email" />
    </LinearLayout>
</ScrollView>


================================================
FILE: sample/src/main/res/menu/activity_main.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/menu_feedback"
        android:title="@string/menu_feedback" />
</menu>


================================================
FILE: sample/src/main/res/values/dimens.xml
================================================
<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
</resources>


================================================
FILE: sample/src/main/res/values/strings.xml
================================================
<resources>
    <string name="app_name">Email Intent Builder</string>

    <string name="button_label_send_email">Send email</string>
    <string name="title_to">To</string>
    <string name="title_cc">Cc</string>
    <string name="title_bcc">Bcc</string>
    <string name="title_subject">Subject</string>
    <string name="title_body">Body</string>
    <string name="menu_feedback">Feedback</string>
    <string name="feedback_subject">Feedback for EmailIntentBuilder</string>
    <string name="error_no_email_app">No email app found</string>
    <string name="feedback_body">[Your feedback here]</string>
    <string name="argument_error">Error: %s</string>
</resources>


================================================
FILE: sample/src/main/res/values/styles.xml
================================================
<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>


================================================
FILE: settings.gradle
================================================
include ':sample', ':library'