Repository: NightlyNexus/ViewStatePagerAdapter
Branch: master
Commit: ee35f709f8a1
Files: 27
Total size: 45.5 KB

Directory structure:
gitextract_3oak_3gv/

├── .gitignore
├── .travis.yml
├── CHANGELOG.md
├── LICENSE.txt
├── README.md
├── RELEASING.md
├── build.gradle
├── checkstyle.xml
├── gradle/
│   ├── gradle-mvn-push.gradle
│   └── wrapper/
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradle.properties
├── gradlew
├── settings.gradle
├── viewstatepageradapter/
│   ├── build.gradle
│   ├── gradle.properties
│   └── src/
│       └── main/
│           ├── AndroidManifest.xml
│           └── java/
│               └── com/
│                   └── nightlynexus/
│                       └── viewstatepageradapter/
│                           └── ViewStatePagerAdapter.java
└── viewstatepageradapter-sample/
    ├── build.gradle
    └── src/
        └── main/
            ├── AndroidManifest.xml
            ├── java/
            │   └── com/
            │       └── nightlynexus/
            │           └── viewstatepageradaptersample/
            │               ├── ViewPagerActivity.java
            │               └── ViewPagerAdapter.java
            └── res/
                ├── layout/
                │   ├── page_bottom.xml
                │   ├── page_top.xml
                │   └── pagers.xml
                └── values/
                    ├── dimens.xml
                    └── strings.xml

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

================================================
FILE: .gitignore
================================================
# IntelliJ IDEA
.idea
*.iml

# Gradle
.gradle
gradlew.bat
build
local.properties

lint-reports

# Mac OS
.DS_Store


================================================
FILE: .travis.yml
================================================
language: android

jdk:
- oraclejdk8

before_install:
# Install SDK license so Android Gradle plugin can install deps.
- mkdir "$ANDROID_HOME/licenses" || true
- echo "24333f8a63b6825ea9c5514f83c2829b004d1fee" > "$ANDROID_HOME/licenses/android-sdk-license"
# Install the rest of tools (e.g., avdmanager).
- sdkmanager tools
# Install the system image.
- sdkmanager "system-images;android-19;default;armeabi-v7a"
# Create and start emulator for the script. Meant to race the install task.
- echo no | avdmanager create avd --force -n test -k "system-images;android-19;default;armeabi-v7a"
- $ANDROID_HOME/emulator/emulator -avd test -no-audio -no-window &

install: ./gradlew clean assemble --stacktrace

before_script:
- android-wait-for-emulator
- adb shell settings put global window_animation_scale 0 &
- adb shell settings put global transition_animation_scale 0 &
- adb shell settings put global animator_duration_scale 0 &
- adb shell input keyevent 82 &

script: ./gradlew check connectedCheck --stacktrace

env:
  global:
  - ADB_INSTALL_TIMEOUT=8

notifications:
  email: false

sudo: false

cache:
  directories:
  - $HOME/.gradle


================================================
FILE: CHANGELOG.md
================================================
Change Log
==========

Version 1.1.0 *(2019-03-02)*
----------------------------

 * New: Update to androidx.


Version 1.0.4 *(2017-01-07)*
----------------------------

 * New: Update to support v4 split to reduce method count.


Version 1.0.3 *(2016-08-04)*
----------------------------

 * New: Expose the SavedState final type via `saveState()`.


Version 1.0.2 *(2016-06-11)*
----------------------------

 * Fix: Revert last fix. The wrong Parcelable being restored is always a consumer error, as far as has been observed.


Version 1.0.1 *(2016-06-05)*
----------------------------

 * Fix: Fail silently with wrong restored Parcelable.


Version 1.0.0 *(2016-06-04)*
----------------------------

 * Initial version.


================================================
FILE: LICENSE.txt
================================================

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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================================================
FILE: README.md
================================================
ViewStatePagerAdapter
=====================

Saves and restores View states in ViewPagers.

[`ViewStatePagerAdapter`](viewstatepageradapter/src/main/java/com/nightlynexus/viewstatepageradapter/ViewStatePagerAdapter.java) is simply an implementation of `androidx.viewpager.widget.PagerAdapter` and automatically saves and restores View states when returning to pages (previously removed Views in the ViewPager) and after ViewPager's state restoration.
`ViewStatePagerAdapter` is similar to [`androidx.fragment.app.FragmentStatePagerAdapter`](https://developer.android.com/reference/androidx/fragment/app/FragmentStatePagerAdapter/) but for use with just Views, rather than Fragments.

### Sample

The sample application shows the difference between the use of a `ViewStatePagerAdapter` and a `ViewPagerAdapter` (with no saving and restoring of View state).

![](images/sample.gif)

Download
--------

Gradle:

```groovy
compile 'com.nightlynexus.viewstatepageradapter:viewstatepageradapter:1.1.0'
```

License
--------

    Copyright 2016 Eric Cochran

    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: RELEASING.md
================================================
Releasing
========

 1. Change the version in `gradle.properties` to a non-SNAPSHOT version.
 2. Update the `CHANGELOG.md` for the impending release.
 3. Update the `README.md` with the new version.
 4. `git commit -am "Prepare for release X.Y.Z."` (where X.Y.Z is the new version)
 5. `./gradlew clean uploadArchives`.
 6. Visit [Sonatype Nexus](https://oss.sonatype.org/) and promote the artifact.
 7. `git tag -a X.Y.X -m "Version X.Y.Z"` (where X.Y.Z is the new version)
 8. Update the `gradle.properties` to the next SNAPSHOT version.
 9. `git commit -am "Prepare next development version."`
 10. `git push && git push --tags`

If step 5 or 6 fails, drop the Sonatype repo, fix the problem, commit, and start again at step 5.


================================================
FILE: build.gradle
================================================
buildscript {
  dependencies {
    classpath 'com.android.tools.build:gradle:3.3.1'
    classpath 'net.ltgt.gradle:gradle-errorprone-plugin:0.0.16'
  }

  repositories {
    google()
    mavenCentral()
    maven { url 'https://plugins.gradle.org/m2/' }
  }
}

allprojects {
  tasks.withType(JavaCompile) {
    options.compilerArgs += ['-Xlint:all',
                             '-Xlint:-deprecation',
                             '-Werror']
  }

  apply plugin: 'net.ltgt.errorprone'
  apply plugin: 'checkstyle'

  repositories {
    google()
    jcenter() // Needed for Lint.
  }

  dependencies {
    errorprone 'com.google.errorprone:error_prone_core:2.3.3'
  }

  task checkstyle(type: Checkstyle) {
    configFile rootProject.file('checkstyle.xml')
    source 'src'
    include '**/*.java'
    exclude '**/gen/**'

    classpath = files()
  }

  checkstyle {
    toolVersion = '7.7'
  }
}


================================================
FILE: checkstyle.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
  <property name="charset" value="UTF-8"/>
  <module name="SuppressWarningsFilter"/>
  <module name="NewlineAtEndOfFile"/>
  <module name="FileLength"/>
  <module name="FileTabCharacter"/>

  <!-- Trailing spaces -->
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>

  <!-- Space after 'for' and 'if' -->
  <module name="RegexpSingleline">
    <property name="format" value="^\s*(for|if)\b[^ ]"/>
    <property name="message" value="Space needed before opening parenthesis."/>
  </module>

  <!-- For each spacing -->
  <module name="RegexpSingleline">
    <property name="format" value="^\s*for \(.*?([^ ]:|:[^ ])"/>
    <property name="message" value="Space needed around ':' character."/>
  </module>

  <module name="TreeWalker">
    <module name="Indentation">
      <property name="basicOffset" value="2"/>
      <property name="braceAdjustment" value="0"/>
      <property name="caseIndent" value="2"/>
      <property name="throwsIndent" value="4"/>
      <property name="lineWrappingIndentation" value="4"/>
      <property name="arrayInitIndent" value="2"/>
    </module>
    <!-- Checks for Javadoc comments.                     -->
    <!-- See http://checkstyle.sf.net/config_javadoc.html -->
    <!--module name="JavadocMethod"/-->
    <!--module name="JavadocType"/-->
    <!--module name="JavadocVariable"/-->
    <module name="JavadocStyle"/>


    <!-- Checks for Naming Conventions.                  -->
    <!-- See http://checkstyle.sf.net/config_naming.html -->
    <!--<module name="ConstantName"/>-->
    <!--<module name="LocalFinalVariableName"/>-->
    <!--<module name="LocalVariableName"/>-->
    <!--<module name="MemberName"/>-->
    <module name="MethodName"/>
    <!--<module name="PackageName"/>-->
    <!--<module name="ParameterName"/>-->
    <!--<module name="StaticVariableName"/>-->
    <module name="TypeName"/>


    <!-- Checks for imports                              -->
    <!-- See http://checkstyle.sf.net/config_import.html -->
    <module name="AvoidStarImport"/>
    <module name="IllegalImport"/>
    <!-- defaults to sun.* packages -->
    <module name="RedundantImport"/>
    <module name="UnusedImports">
      <property name="processJavadoc" value="true"/>
    </module>


    <!-- Checks for Size Violations.                    -->
    <!-- See http://checkstyle.sf.net/config_sizes.html -->
    <module name="LineLength">
      <property name="max" value="100"/>
    </module>
    <module name="MethodLength">
      <property name="max" value="200"/>
    </module>


    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
    <module name="GenericWhitespace"/>
    <module name="EmptyForIteratorPad"/>
    <module name="MethodParamPad"/>
    <!--<module name="NoWhitespaceAfter"/>-->
    <!--<module name="NoWhitespaceBefore"/>-->
    <module name="OperatorWrap"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround">
      <property name="tokens"
          value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN,
          COLON, DIV, DIV_ASSIGN, DO_WHILE, EQUAL, GE, GT, LAND, LCURLY, LE, LITERAL_CATCH,
          LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN,
          LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS,
          MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, SL, SLIST,
          SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, LITERAL_ASSERT, TYPE_EXTENSION_AND"/>
    </module>


    <!-- Modifier Checks                                    -->
    <!-- See http://checkstyle.sf.net/config_modifiers.html -->
    <module name="ModifierOrder"/>
    <!-- Some View constructors are invoked with reflection. -->
    <!--<module name="RedundantModifier"/>-->


    <!-- Checks for blocks. You know, those {}'s         -->
    <!-- See http://checkstyle.sf.net/config_blocks.html -->
    <module name="AvoidNestedBlocks"/>
    <!--<module name="EmptyBlock"/>-->
    <module name="LeftCurly"/>
    <!--<module name="NeedBraces"/>-->
    <module name="RightCurly"/>


    <!-- Checks for common coding problems               -->
    <!-- See http://checkstyle.sf.net/config_coding.html -->
    <module name="CovariantEquals"/>
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <module name="IllegalInstantiation"/>
    <module name="InnerAssignment"/>
    <module name="MissingSwitchDefault"/>
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>

    <!-- Checks for class design                         -->
    <!-- See http://checkstyle.sf.net/config_design.html -->
    <module name="DesignForExtension"/>
    <module name="FinalClass"/>
    <module name="HideUtilityClassConstructor"/>
    <module name="InterfaceIsType"/>
    <!--<module name="VisibilityModifier"/>-->


    <!-- Miscellaneous other checks.                   -->
    <!-- See http://checkstyle.sf.net/config_misc.html -->
    <module name="ArrayTypeStyle"/>
    <!--<module name="TodoComment"/>-->
    <module name="UpperEll"/>

    <!-- Make the @SuppressWarnings annotations available to Checkstyle -->
    <module name="SuppressWarningsHolder"/>
  </module>
</module>


================================================
FILE: gradle/gradle-mvn-push.gradle
================================================
/*
 * Copyright 2013 Chris Banes
 *
 * 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.
 */

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

def isReleaseBuild() {
  return VERSION_NAME.contains("SNAPSHOT") == false
}

def getRepositoryUsername() {
  return hasProperty('SONATYPE_NEXUS_USERNAME') ? SONATYPE_NEXUS_USERNAME : ""
}

def getRepositoryPassword() {
  return hasProperty('SONATYPE_NEXUS_PASSWORD') ? SONATYPE_NEXUS_PASSWORD : ""
}

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

        pom.groupId = GROUP
        pom.artifactId = POM_ARTIFACT_ID
        pom.version = VERSION_NAME

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

        pom.project {
          name POM_NAME
          packaging POM_PACKAGING
          description POM_DESCRIPTION
          url POM_URL

          scm {
            url POM_SCM_URL
            connection POM_SCM_CONNECTION
            developerConnection POM_SCM_DEV_CONNECTION
          }

          licenses {
            license {
              name POM_LICENCE_NAME
              url POM_LICENCE_URL
              distribution POM_LICENCE_DIST
            }
          }

          developers {
            developer {
              id POM_DEVELOPER_ID
              name POM_DEVELOPER_NAME
            }
          }
        }
      }
    }
  }

  signing {
    required { isReleaseBuild() && 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))

    if (JavaVersion.current().isJava8Compatible()) {
      allprojects {
        tasks.withType(Javadoc) {
          options.addStringOption('Xdoclint:none', '-quiet')
        }
      }
    }
  }

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

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

  artifacts {
    archives androidSourcesJar
    archives androidJavadocsJar
  }
}


================================================
FILE: gradle/wrapper/gradle-wrapper.properties
================================================
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-all.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists


================================================
FILE: gradle.properties
================================================
VERSION_NAME=1.1.0
GROUP=com.nightlynexus.viewstatepageradapter

POM_DESCRIPTION=Saves and restores View states in ViewPagers.
POM_URL=https://github.com/NightlyNexus/ViewStatePagerAdapter/
POM_SCM_URL=https://github.com/NightlyNexus/ViewStatePagerAdapter/
POM_SCM_CONNECTION=scm:git@github.com/NightlyNexus/ViewStatePagerAdapter.git
POM_SCM_DEV_CONNECTION=scm:git@github.com:NightlyNexus/ViewStatePagerAdapter.git
POM_LICENCE_NAME=The Apache Software License, Version 2.0
POM_LICENCE_URL=http://www.apache.org/licenses/LICENSE-2.0.txt
POM_LICENCE_DIST=repo
POM_DEVELOPER_ID=NightlyNexus
POM_DEVELOPER_NAME=Eric Cochran


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

##############################################################################
##
##  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"'

# 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, switch paths to Windows format before running java
if $cygwin ; then
    APP_HOME=`cygpath --path --mixed "$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`="\"$arg\""
        fi
        i=$((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"

# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
  cd "$(dirname "$0")"
fi

exec "$JAVACMD" "$@"


================================================
FILE: settings.gradle
================================================
include ':viewstatepageradapter', ':viewstatepageradapter-sample'


================================================
FILE: viewstatepageradapter/build.gradle
================================================
apply plugin: 'com.android.library'
apply from: rootProject.file('gradle/gradle-mvn-push.gradle')

android {
  compileSdkVersion 28

  defaultConfig {
    minSdkVersion 15
  }

  lintOptions {
    abortOnError true
    warningsAsErrors true
    textReport true
    textOutput 'stdout'
    htmlReport true
    htmlOutput rootProject.file("lint-reports/${name}.html")
  }

  // TODO: Replace with https://issuetracker.google.com/issues/72050365 once released.
  libraryVariants.all {
    it.generateBuildConfig.enabled = false
  }
}

dependencies {
  api 'androidx.viewpager:viewpager:1.0.0'
}


================================================
FILE: viewstatepageradapter/gradle.properties
================================================
POM_NAME=ViewStatePagerAdapter
POM_ARTIFACT_ID=viewstatepageradapter
POM_PACKAGING=aar


================================================
FILE: viewstatepageradapter/src/main/AndroidManifest.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.nightlynexus.viewstatepageradapter"/>


================================================
FILE: viewstatepageradapter/src/main/java/com/nightlynexus/viewstatepageradapter/ViewStatePagerAdapter.java
================================================
/*
 * Copyright (C) 2016 Eric Cochran
 *
 * 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 com.nightlynexus.viewstatepageradapter;

import android.os.Parcel;
import android.os.Parcelable;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import androidx.viewpager.widget.PagerAdapter;

public abstract class ViewStatePagerAdapter extends PagerAdapter {
  private final SparseArray<View> attached;
  private SparseArray<SparseArray<Parcelable>> detached;

  public ViewStatePagerAdapter() {
    this(3);
  }

  /**
   * @param capacity the initial capacity of the collection of attached Views.
   */
  public ViewStatePagerAdapter(int capacity) {
    attached = new SparseArray<>(capacity);
  }

  protected abstract View createView(ViewGroup container, int position);

  protected void destroyView(ViewGroup container, int position, View view) {
  }

  @Override public final SavedState saveState() {
    for (int i = 0, size = attached.size(); i < size; i++) {
      int position = attached.keyAt(i);
      View view = attached.valueAt(i);
      putInDetached(position, view);
    }
    return new SavedState(detached);
  }

  @Override public final void restoreState(Parcelable state, ClassLoader loader) {
    SavedState savedState = (SavedState) state;
    detached = savedState.detached;
  }

  @Override public final Object instantiateItem(ViewGroup container, int position) {
    if (detached == null) {
      detached = new SparseArray<>();
    }
    View view = createView(container, position);
    if (view == null) {
      throw new NullPointerException(
          "createView must not return null. (position: " + position + ")");
    }
    SparseArray<Parcelable> viewState = detached.get(position);
    if (viewState != null) {
      view.restoreHierarchyState(viewState);
    }
    container.addView(view);
    attached.put(position, view);
    return view;
  }

  @Override public final void destroyItem(ViewGroup container, int position, Object object) {
    View view = (View) object;
    destroyView(container, position, view);
    putInDetached(position, view);
    container.removeView(view);
    attached.remove(position);
  }

  private void putInDetached(int position, View view) {
    SparseArray<Parcelable> viewState = new SparseArray<>();
    view.saveHierarchyState(viewState);
    detached.put(position, viewState);
  }

  @Override public final Object instantiateItem(View container, int position) {
    throw new UnsupportedOperationException();
  }

  @Override public final void destroyItem(View container, int position, Object object) {
    throw new UnsupportedOperationException();
  }

  @Override public final boolean isViewFromObject(View view, Object object) {
    return view == object;
  }

  public static final class SavedState implements Parcelable {
    final SparseArray<SparseArray<Parcelable>> detached;

    SavedState(SparseArray<SparseArray<Parcelable>> detached) {
      this.detached = detached;
    }

    @Override public void writeToParcel(Parcel dest, int flags) {
      writeNestedSparseArray(dest, detached, flags);
    }

    public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
      @Override public SavedState createFromParcel(Parcel in) {
        SparseArray<SparseArray<Parcelable>> detached =
            readNestedSparseArray(in, SavedState.class.getClassLoader());
        return new SavedState(detached);
      }

      @Override public SavedState[] newArray(int size) {
        return new SavedState[size];
      }
    };

    @Override public int describeContents() {
      return 0;
    }

    static SparseArray<SparseArray<Parcelable>> readNestedSparseArray(Parcel in,
        ClassLoader loader) {
      int size = in.readInt();
      if (size == -1) {
        return null;
      }
      SparseArray<SparseArray<Parcelable>> map = new SparseArray<>(size);
      while (size != 0) {
        int key = in.readInt();
        SparseArray<Parcelable> value = readSparseArray(in, loader);
        map.append(key, value);
        size--;
      }
      return map;
    }

    static SparseArray<Parcelable> readSparseArray(Parcel in, ClassLoader loader) {
      int size = in.readInt();
      if (size == -1) {
        return null;
      }
      SparseArray<Parcelable> map = new SparseArray<>(size);
      while (size != 0) {
        int key = in.readInt();
        Parcelable value = in.readParcelable(loader);
        map.append(key, value);
        size--;
      }
      return map;
    }

    static void writeNestedSparseArray(Parcel dest, SparseArray<SparseArray<Parcelable>> map,
        int flags) {
      if (map == null) {
        dest.writeInt(-1);
        return;
      }
      int size = map.size();
      dest.writeInt(size);
      int i = 0;
      while (i != size) {
        dest.writeInt(map.keyAt(i));
        writeSparseArray(dest, map.valueAt(i), flags);
        i++;
      }
    }

    static void writeSparseArray(Parcel dest, SparseArray<Parcelable> map, int flags) {
      if (map == null) {
        dest.writeInt(-1);
        return;
      }
      int size = map.size();
      dest.writeInt(size);
      int i = 0;
      while (i != size) {
        dest.writeInt(map.keyAt(i));
        dest.writeParcelable(map.valueAt(i), flags);
        i++;
      }
    }
  }
}


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

android {
  compileSdkVersion 28

  defaultConfig {
    applicationId "com.nightlynexus.viewstatepageradaptersample"
    minSdkVersion 15
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
  }

  lintOptions {
    abortOnError true
    // warningsAsErrors true
    textReport true
    textOutput 'stdout'
    htmlReport true
    htmlOutput rootProject.file("lint-reports/${name}.html")
  }
}

dependencies {
  implementation project(':viewstatepageradapter')
}


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

  <application
      android:allowBackup="true"
      android:fullBackupContent="true"
      android:label="@string/label_application"
      android:supportsRtl="true"
      tools:ignore="GoogleAppIndexingWarning,MissingApplicationIcon">

    <activity android:name=".ViewPagerActivity">
      <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.LAUNCHER"/>
      </intent-filter>
    </activity>
  </application>
</manifest>


================================================
FILE: viewstatepageradapter-sample/src/main/java/com/nightlynexus/viewstatepageradaptersample/ViewPagerActivity.java
================================================
package com.nightlynexus.viewstatepageradaptersample;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.viewpager.widget.ViewPager;
import com.nightlynexus.viewstatepageradapter.ViewStatePagerAdapter;

public final class ViewPagerActivity extends Activity {
  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.pagers);
    ViewPager withState = findViewById(R.id.with_state);
    ViewPager withoutState = findViewById(R.id.without_state);
    withState.setAdapter(new SampleEditTextViewStatePagerAdapter(withState.getContext()));
    withoutState.setAdapter(new SampleEditTextViewPagerAdapter(withoutState.getContext()));
  }

  private static final class SampleEditTextViewStatePagerAdapter extends ViewStatePagerAdapter {
    private final Context context;

    SampleEditTextViewStatePagerAdapter(Context context) {
      this.context = context;
    }

    @SuppressLint("SetTextI18n") @Override
    protected View createView(ViewGroup container, int position) {
      View view = LayoutInflater.from(context).inflate(R.layout.page_top, container, false);
      TextView pagerNumber = view.findViewById(R.id.page_number);
      pagerNumber.setText(Integer.toString(position));
      return view;
    }

    @Override public int getCount() {
      return 10;
    }
  }

  private static final class SampleEditTextViewPagerAdapter extends ViewPagerAdapter {
    private final Context context;

    SampleEditTextViewPagerAdapter(Context context) {
      this.context = context;
    }

    @SuppressLint("SetTextI18n") @Override
    protected View createView(ViewGroup container, int position) {
      View view = LayoutInflater.from(context).inflate(R.layout.page_bottom, container, false);
      TextView pagerNumber = view.findViewById(R.id.page_number);
      pagerNumber.setText(Integer.toString(position));
      return view;
    }

    @Override public int getCount() {
      return 10;
    }
  }
}


================================================
FILE: viewstatepageradapter-sample/src/main/java/com/nightlynexus/viewstatepageradaptersample/ViewPagerAdapter.java
================================================
package com.nightlynexus.viewstatepageradaptersample;

import android.view.View;
import android.view.ViewGroup;
import androidx.viewpager.widget.PagerAdapter;

abstract class ViewPagerAdapter extends PagerAdapter {
  protected abstract View createView(ViewGroup container, int position);

  protected void destroyView(ViewGroup container, int position, View view) {
  }

  @Override public final Object instantiateItem(ViewGroup container, int position) {
    View view = createView(container, position);
    if (view == null) {
      throw new NullPointerException(
          "createView must not return null. (position: " + position + ")");
    }
    container.addView(view);
    return view;
  }

  @Override public final void destroyItem(ViewGroup container, int position, Object object) {
    View view = (View) object;
    destroyView(container, position, view);
    container.removeView(view);
  }

  @Override public final Object instantiateItem(View container, int position) {
    throw new UnsupportedOperationException();
  }

  @Override public final void destroyItem(View container, int position, Object object) {
    throw new UnsupportedOperationException();
  }

  @Override public final boolean isViewFromObject(View view, Object object) {
    return view == object;
  }
}


================================================
FILE: viewstatepageradapter-sample/src/main/res/layout/page_bottom.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="@dimen/page_padding"
    >

  <EditText
      android:id="@+id/text"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_above="@+id/page_number"
      android:inputType="text"
      android:textSize="@dimen/page_text_text_size"
      />

  <TextView
      android:id="@id/page_number"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_centerHorizontal="true"
      android:gravity="center_horizontal"
      android:textSize="@dimen/page_number_text_size"
      />
</RelativeLayout>


================================================
FILE: viewstatepageradapter-sample/src/main/res/layout/page_top.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="@dimen/page_padding"
    >

  <TextView
      android:id="@+id/page_number"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center_horizontal"
      android:gravity="center_horizontal"
      android:textSize="@dimen/page_number_text_size"
      />

  <EditText
      android:id="@+id/text"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="center_vertical"
      android:inputType="text"
      android:textSize="@dimen/page_text_text_size"
      />
</LinearLayout>


================================================
FILE: viewstatepageradapter-sample/src/main/res/layout/pagers.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="@dimen/pagers_margin_vertical"
    android:layout_marginBottom="@dimen/pagers_margin_vertical"
    android:orientation="vertical"
    >

  <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="center_horizontal"
      android:gravity="center_horizontal"
      android:text="@string/pager_with_state"
      android:textSize="@dimen/pager_title_text_size"
      />

  <androidx.viewpager.widget.ViewPager
      android:id="@+id/with_state"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_weight="1"
      />

  <androidx.viewpager.widget.ViewPager
      android:id="@+id/without_state"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_weight="1"
      />

  <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="center_horizontal"
      android:gravity="center_horizontal"
      android:text="@string/pager_without_state"
      android:textSize="@dimen/pager_title_text_size"
      />
</LinearLayout>


================================================
FILE: viewstatepageradapter-sample/src/main/res/values/dimens.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<resources>
  <dimen name="pagers_margin_vertical">16dp</dimen>
  <dimen name="pager_title_text_size">16sp</dimen>
  <dimen name="page_padding">32dp</dimen>
  <dimen name="page_number_text_size">24sp</dimen>
  <dimen name="page_text_text_size">32sp</dimen>
</resources>


================================================
FILE: viewstatepageradapter-sample/src/main/res/values/strings.xml
================================================
<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="label_application">ViewStatePagerAdapter Sample</string>
  <string name="pager_with_state">With State</string>
  <string name="pager_without_state">With<i>out</i> State</string>
</resources>