├── app ├── .gitignore ├── src │ └── main │ │ ├── res │ │ ├── drawable-nodpi │ │ │ ├── daredevil.jpg │ │ │ ├── grandtour.jpg │ │ │ └── johnoliver.jpg │ │ ├── mipmap-hdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-mdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-xhdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxhdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxxhdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── values │ │ │ ├── colors.xml │ │ │ ├── dimens.xml │ │ │ ├── strings.xml │ │ │ └── styles.xml │ │ ├── mipmap-anydpi-v26 │ │ │ ├── ic_launcher.xml │ │ │ └── ic_launcher_round.xml │ │ ├── drawable-v24 │ │ │ └── ic_launcher_foreground.xml │ │ ├── layout │ │ │ ├── item_show.xml │ │ │ └── activity_main.xml │ │ └── drawable │ │ │ └── ic_launcher_background.xml │ │ ├── java │ │ └── com │ │ │ └── patrickiv │ │ │ └── demo │ │ │ └── parallax │ │ │ ├── util │ │ │ ├── SlowPagerSnapHelper.kt │ │ │ └── SlowLinearSmoothScroller.kt │ │ │ ├── extensions │ │ │ └── ViewGroupExtensions.kt │ │ │ ├── recyclerview │ │ │ ├── ShowAdapter.kt │ │ │ └── ShowViewHolder.kt │ │ │ ├── Show.kt │ │ │ └── MainActivity.kt │ │ └── AndroidManifest.xml ├── proguard-rules.pro └── build.gradle ├── settings.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── .idea ├── encodings.xml ├── vcs.xml ├── misc.xml ├── runConfigurations.xml └── gradle.xml ├── .gitignore ├── gradle.properties ├── gradlew.bat └── gradlew /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /.idea/encodings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-nodpi/daredevil.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/drawable-nodpi/daredevil.jpg -------------------------------------------------------------------------------- /app/src/main/res/drawable-nodpi/grandtour.jpg: -------------------------------------------------------------------------------- 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/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/patrick-elmquist/Demo-RecyclerViewParallax/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Wed Oct 31 18:34:17 CET 2018 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-5.0-rc-3-all.zip 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #FFFEFEFE 4 | #FFFEFEFE 5 | #FFEF6C53 6 | 7 | #1A000000 8 | 9 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/util/SlowPagerSnapHelper.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax.util 2 | 3 | import android.content.Context 4 | import androidx.recyclerview.widget.PagerSnapHelper 5 | import androidx.recyclerview.widget.RecyclerView.LayoutManager 6 | 7 | class SlowPagerSnapHelper(private val context: Context) : PagerSnapHelper() { 8 | override fun createScroller(lm: LayoutManager?) = SlowLinearSmoothScroller(context) 9 | } 10 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/extensions/ViewGroupExtensions.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax.extensions 2 | 3 | import android.view.LayoutInflater 4 | import android.view.View 5 | import android.view.ViewGroup 6 | import androidx.annotation.LayoutRes 7 | 8 | /** 9 | * Inflate the given layout resource 10 | */ 11 | fun ViewGroup.inflate(@LayoutRes layoutRes: Int, attach: Boolean = false): View { 12 | return LayoutInflater.from(context).inflate(layoutRes, this, attach) 13 | } 14 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 14 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/main/res/values/dimens.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 4dp 5 | 8dp 6 | 12dp 7 | 16dp 8 | 32dp 9 | 10 | 96dp 11 | 152dp 12 | 6dp 13 | 14 | 280dp 15 | 4dp 16 | 17 | 128dp 18 | 19 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/util/SlowLinearSmoothScroller.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax.util 2 | 3 | import android.content.Context 4 | import android.util.DisplayMetrics 5 | import androidx.recyclerview.widget.LinearSmoothScroller 6 | import androidx.recyclerview.widget.RecyclerView 7 | 8 | private const val DEFAULT_TARGET = RecyclerView.NO_POSITION 9 | private const val SCROLL_SLOW_FACTOR = 4.0f 10 | class SlowLinearSmoothScroller(context: Context, target: Int = DEFAULT_TARGET) : LinearSmoothScroller(context) { 11 | init { 12 | targetPosition = target 13 | } 14 | override fun calculateSpeedPerPixel(dm: DisplayMetrics?) = super.calculateSpeedPerPixel(dm) * SCROLL_SLOW_FACTOR 15 | } -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/recyclerview/ShowAdapter.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax.recyclerview 2 | 3 | import android.view.ViewGroup 4 | import androidx.recyclerview.widget.RecyclerView 5 | import com.patrickiv.demo.parallax.R 6 | import com.patrickiv.demo.parallax.Show 7 | import com.patrickiv.demo.parallax.extensions.inflate 8 | 9 | class ShowAdapter(private val items: List) : RecyclerView.Adapter() { 10 | init { 11 | setHasStableIds(true) 12 | } 13 | override fun getItemCount() = items.size 14 | override fun getItemId(position: Int) = items[position].hashCode().toLong() 15 | override fun onCreateViewHolder(parent: ViewGroup, vt: Int) = ShowViewHolder(parent.inflate(R.layout.item_show)) 16 | override fun onBindViewHolder(holder: ShowViewHolder, position: Int) = holder.bind(items[position]) 17 | } -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | TV Shows 3 | 4 | With parallax 5 | Without parallax 6 | 7 | The Grand Tour 8 | Follow Jeremy, Richard, and James, as they embark on an adventure across the globe. 9 | 10 | "Daredevil" 11 | "A blind lawyer by day, vigilante by night. Matt Murdock fights the crime of New York as Daredevil." 12 | 13 | Last Week Tonight with John Oliver 14 | Former Daily Show host and correspondent John Oliver brings his persona to this new weekly news satire program. 15 | 16 | 17 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/Show.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax 2 | 3 | import androidx.annotation.DrawableRes 4 | import androidx.annotation.StringRes 5 | 6 | data class Show(@StringRes val title: Int, @StringRes val description: Int, @DrawableRes val image: Int) 7 | 8 | object ShowRepository { 9 | fun getAll(): List { 10 | return listOf( 11 | Show( 12 | R.string.the_grand_tour_title, 13 | R.string.the_grand_tour_description, 14 | R.drawable.grandtour 15 | ), 16 | Show( 17 | R.string.daredevil_title, 18 | R.string.daredevil_description, 19 | R.drawable.daredevil 20 | ), 21 | Show( 22 | R.string.john_oliver_title, 23 | R.string.john_oliver_description, 24 | R.drawable.johnoliver 25 | ) 26 | ) 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 7 | 14 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 13 | 14 | 17 | 18 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | apply plugin: 'kotlin-android' 3 | apply plugin: 'kotlin-android-extensions' 4 | 5 | android { 6 | compileSdkVersion 28 7 | defaultConfig { 8 | applicationId 'com.patrickiv.demo.parallax' 9 | minSdkVersion 24 10 | targetSdkVersion 28 11 | versionCode 1 12 | versionName "0.0.1" 13 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 14 | } 15 | buildTypes { 16 | release { 17 | minifyEnabled false 18 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 19 | } 20 | } 21 | } 22 | 23 | dependencies { 24 | implementation fileTree(include: ['*.jar'], dir: 'libs') 25 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 26 | implementation 'androidx.appcompat:appcompat:1.0.0' 27 | implementation 'androidx.recyclerview:recyclerview:1.0.0' 28 | implementation 'androidx.core:core-ktx:1.0.0' 29 | testImplementation 'junit:junit:4.12' 30 | androidTestImplementation 'androidx.test:runner:1.1.0' 31 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0' 32 | } 33 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | # IDE (e.g. Android Studio) users: 3 | # Gradle settings configured through the IDE *will override* 4 | # any settings specified in this file. 5 | # For more details on how to configure your build environment visit 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html 7 | # Specifies the JVM arguments used for the daemon process. 8 | # The setting is particularly useful for tweaking memory settings. 9 | org.gradle.jvmargs=-Xmx1536m 10 | # When configured, Gradle will run in incubating parallel mode. 11 | # This option should only be used with decoupled projects. More details, visit 12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 13 | # org.gradle.parallel=true 14 | # AndroidX package structure to make it clearer which packages are bundled with the 15 | # Android operating system, and which are packaged with your app's APK 16 | # https://developer.android.com/topic/libraries/support-library/androidx-rn 17 | android.useAndroidX=true 18 | # Automatically convert third-party libraries to use AndroidX 19 | android.enableJetifier=true 20 | # Kotlin code style for this project: "official" or "obsolete": 21 | kotlin.code.style=official 22 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/recyclerview/ShowViewHolder.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax.recyclerview 2 | 3 | import android.graphics.Matrix 4 | import android.view.View 5 | import androidx.core.view.doOnPreDraw 6 | import androidx.interpolator.view.animation.FastOutLinearInInterpolator 7 | import androidx.recyclerview.widget.RecyclerView.ViewHolder 8 | import com.patrickiv.demo.parallax.Show 9 | import kotlinx.android.synthetic.main.item_show.view.* 10 | import kotlin.math.abs 11 | 12 | class ShowViewHolder(view: View) : ViewHolder(view) { 13 | private val title = itemView.title 14 | private val description = itemView.description 15 | private val thumbnail = itemView.thumbnail 16 | private val poster = itemView.poster 17 | 18 | private val interpolator = FastOutLinearInInterpolator() 19 | 20 | /** 21 | * Offset the thumbnail and text with a factor [-1.0..1.0] of the total width 22 | */ 23 | var offset: Float = 0f 24 | set(v) { 25 | // Ensure that the value is in the range [-1.0..1.0] 26 | field = v.coerceIn(-1f, 1f) 27 | 28 | // The interpolator wants an input value in the [0.0..1.0] range so 29 | // let's preserve the direction (field < 0 = left, field > 0 = right)... 30 | val direction = if (field < 0) -1f else 1f 31 | 32 | // ...and provide the absolute field value to the interpolator. 33 | val interpolatedValue = interpolator.getInterpolation(abs(field)) 34 | 35 | // Calculate the translation... 36 | val translationX = direction * itemView.measuredWidth * interpolatedValue 37 | 38 | // ...and apply it to the thumbnail, title and description 39 | title.translationX = translationX 40 | description.translationX = translationX 41 | thumbnail.translationX = translationX 42 | } 43 | 44 | fun bind(viewModel: Show) { 45 | title.setText(viewModel.title) 46 | description.setText(viewModel.description) 47 | thumbnail.setImageResource(viewModel.image) 48 | poster.setImageResource(viewModel.image) 49 | poster.doOnPreDraw { 50 | val m = Matrix(poster.imageMatrix) 51 | val scaleX = poster.measuredWidth / poster.drawable.intrinsicWidth.toFloat() 52 | m.preScale(scaleX, scaleX) 53 | m.postTranslate(0f, -poster.drawable.intrinsicHeight * scaleX / 2.5f) 54 | poster.imageMatrix = m 55 | } 56 | } 57 | } -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /app/src/main/res/layout/item_show.xml: -------------------------------------------------------------------------------- 1 | 2 | 11 | 12 | 19 | 20 | 34 | 35 | 43 | 44 | 54 | 55 | 56 | 57 | 67 | 68 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 10 | 11 | 18 | 19 | 23 | 24 | 34 | 35 | 42 | 43 | 47 | 48 | 58 | 59 | 67 | 68 | 72 | 73 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/java/com/patrickiv/demo/parallax/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.patrickiv.demo.parallax 2 | 3 | import android.animation.Animator 4 | import android.animation.AnimatorSet 5 | import android.animation.ObjectAnimator 6 | import android.os.Bundle 7 | import android.os.Handler 8 | import android.view.MotionEvent 9 | import android.view.View 10 | import androidx.appcompat.app.AppCompatActivity 11 | import androidx.core.animation.doOnEnd 12 | import androidx.recyclerview.widget.LinearLayoutManager 13 | import androidx.recyclerview.widget.PagerSnapHelper 14 | import androidx.recyclerview.widget.RecyclerView 15 | import androidx.recyclerview.widget.RecyclerView.OnScrollListener 16 | import androidx.recyclerview.widget.RecyclerView.State 17 | import com.patrickiv.demo.parallax.Direction.LEFT 18 | import com.patrickiv.demo.parallax.Direction.RIGHT 19 | import com.patrickiv.demo.parallax.recyclerview.ShowAdapter 20 | import com.patrickiv.demo.parallax.recyclerview.ShowViewHolder 21 | import com.patrickiv.demo.parallax.util.SlowLinearSmoothScroller 22 | import kotlinx.android.synthetic.main.activity_main.* 23 | 24 | private const val START_DELAY = 750L 25 | private const val SCROLL_DELAY = 1250L 26 | private const val ACTIVE_ALPHA = 1f 27 | private const val DISABLED_ALPHA = 0.28f 28 | 29 | private enum class Direction { LEFT, RIGHT } 30 | 31 | class MainActivity : AppCompatActivity() { 32 | 33 | private val tvShows = ShowRepository.getAll() 34 | private val handler = Handler() 35 | private val scrollTask = { handleScroll() } 36 | 37 | private lateinit var activeView: View 38 | 39 | private var switchListAnimator: Animator? = null 40 | private var index = 0 41 | private var direction = RIGHT 42 | private var hasTouch = false 43 | 44 | override fun onCreate(savedInstanceState: Bundle?) { 45 | super.onCreate(savedInstanceState) 46 | setContentView(R.layout.activity_main) 47 | setSupportActionBar(toolbar) 48 | 49 | setupList(topList, parallax = true) 50 | setupList(bottomList, parallax = false) 51 | 52 | activeView = topList 53 | topLabel.alpha = ACTIVE_ALPHA 54 | topList.alpha = ACTIVE_ALPHA 55 | bottomLabel.alpha = DISABLED_ALPHA 56 | bottomList.alpha = DISABLED_ALPHA 57 | } 58 | 59 | override fun onResume() = super.onResume().also { startShowcaseAnimation() } 60 | override fun onPause() = super.onPause().also { endShowcaseAnimation() } 61 | 62 | private fun setupList(recyclerView: RecyclerView, parallax: Boolean) { 63 | recyclerView.apply { 64 | adapter = ShowAdapter(tvShows) 65 | layoutManager = object : LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false) { 66 | override fun smoothScrollToPosition(recyclerView: RecyclerView?, state: State?, position: Int) { 67 | // Override the default smoothScroll to make the scroll animation behave like a user scroll 68 | startSmoothScroll(SlowLinearSmoothScroller(context, position)) 69 | } 70 | } 71 | 72 | PagerSnapHelper().attachToRecyclerView(this) 73 | 74 | if (parallax) { 75 | setupParallaxScrollListener() 76 | } 77 | setupTouchListener() 78 | } 79 | } 80 | 81 | private fun RecyclerView.setupParallaxScrollListener() { 82 | addOnScrollListener(object : OnScrollListener() { 83 | override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { 84 | val layoutManager = layoutManager as? LinearLayoutManager ?: return 85 | 86 | val scrollOffset = recyclerView.computeHorizontalScrollOffset() 87 | val offsetFactor = (scrollOffset % measuredWidth) / measuredWidth.toFloat() 88 | 89 | val firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition() 90 | findViewHolderForAdapterPosition(firstVisibleItemPosition)?.let { 91 | (it as? ShowViewHolder)?.offset = -offsetFactor // Moves from 0 to 1 92 | } 93 | 94 | val lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition() 95 | if (firstVisibleItemPosition != lastVisibleItemPosition) { 96 | findViewHolderForAdapterPosition(lastVisibleItemPosition)?.let { 97 | (it as? ShowViewHolder)?.offset = 1 - offsetFactor // Moves from -1 to 0 98 | } 99 | } 100 | } 101 | }) 102 | } 103 | 104 | private fun RecyclerView.setupTouchListener() { 105 | setOnTouchListener { _, event -> 106 | hasTouch = when (event.action) { 107 | MotionEvent.ACTION_DOWN -> true 108 | MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> false 109 | else -> hasTouch 110 | } 111 | return@setOnTouchListener false 112 | } 113 | } 114 | 115 | private fun startShowcaseAnimation() = handler.postDelayed(scrollTask, START_DELAY) 116 | 117 | private fun endShowcaseAnimation() { 118 | switchListAnimator?.end() 119 | switchListAnimator = null 120 | handler.removeCallbacksAndMessages(null) 121 | } 122 | 123 | private fun scrollActiveList(index: Int) = when (activeView) { 124 | topList -> topList.smoothScrollToPosition(index) 125 | else -> bottomList.smoothScrollToPosition(index) 126 | } 127 | 128 | private fun switchActiveList(onFinishedAction: () -> Unit) { 129 | activeView = when (activeView) { 130 | topList -> bottomList 131 | else -> topList 132 | } 133 | 134 | switchListAnimator = AnimatorSet().apply { 135 | val topAlpha = if (topList == activeView) ACTIVE_ALPHA else DISABLED_ALPHA 136 | val bottomAlpha = if (bottomList == activeView) ACTIVE_ALPHA else DISABLED_ALPHA 137 | 138 | playTogether( 139 | ObjectAnimator.ofFloat(topLabel, View.ALPHA, topAlpha), 140 | ObjectAnimator.ofFloat(topList, View.ALPHA, topAlpha), 141 | ObjectAnimator.ofFloat(bottomLabel, View.ALPHA, bottomAlpha), 142 | ObjectAnimator.ofFloat(bottomList, View.ALPHA, bottomAlpha) 143 | ) 144 | 145 | doOnEnd { onFinishedAction() } 146 | 147 | start() 148 | } 149 | } 150 | 151 | private fun handleScroll() { 152 | if (hasTouch) { 153 | handler.postDelayed(scrollTask, SCROLL_DELAY) 154 | return 155 | } 156 | 157 | var switchActiveList = false 158 | when (direction) { 159 | LEFT -> { 160 | if (index - 1 < 0) { 161 | direction = RIGHT 162 | index += 1 163 | switchActiveList = true 164 | } else { 165 | index -= 1 166 | } 167 | } 168 | RIGHT -> { 169 | if (index + 1 >= tvShows.size) { 170 | direction = LEFT 171 | index -= 1 172 | } else { 173 | index += 1 174 | } 175 | } 176 | } 177 | 178 | if (switchActiveList) { 179 | switchActiveList { 180 | scrollActiveList(index) 181 | handler.postDelayed(scrollTask, SCROLL_DELAY) 182 | } 183 | } else { 184 | scrollActiveList(index) 185 | handler.postDelayed(scrollTask, SCROLL_DELAY) 186 | } 187 | } 188 | } 189 | --------------------------------------------------------------------------------