├── app ├── .gitignore ├── src │ ├── main │ │ ├── res │ │ │ ├── values │ │ │ │ ├── strings.xml │ │ │ │ ├── colors.xml │ │ │ │ └── styles.xml │ │ │ ├── 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 │ │ │ ├── mipmap-anydpi-v26 │ │ │ │ ├── ic_launcher.xml │ │ │ │ └── ic_launcher_round.xml │ │ │ ├── layout │ │ │ │ └── activity_main.xml │ │ │ ├── drawable-v24 │ │ │ │ └── ic_launcher_foreground.xml │ │ │ └── drawable │ │ │ │ └── ic_launcher_background.xml │ │ ├── AndroidManifest.xml │ │ └── java │ │ │ └── com │ │ │ └── zebrostudio │ │ │ └── snappingscrollviewexample │ │ │ └── MainActivity.kt │ ├── test │ │ └── java │ │ │ └── com │ │ │ └── zebrostudio │ │ │ └── snappingscrollviewexample │ │ │ └── ExampleUnitTest.kt │ └── androidTest │ │ └── java │ │ └── com │ │ └── zebrostudio │ │ └── snappingscrollviewexample │ │ └── ExampleInstrumentedTest.kt ├── proguard-rules.pro └── build.gradle ├── snappingscrollview ├── consumer-rules.pro ├── .gitignore ├── src │ ├── main │ │ ├── res │ │ │ └── values │ │ │ │ └── strings.xml │ │ ├── AndroidManifest.xml │ │ └── java │ │ │ └── com │ │ │ └── zebrostudio │ │ │ └── snappingscrollview │ │ │ └── SnappingScrollView.kt │ ├── test │ │ └── java │ │ │ └── com │ │ │ └── zebrostudio │ │ │ └── snappingscrollview │ │ │ └── ExampleUnitTest.kt │ └── androidTest │ │ └── java │ │ └── com │ │ └── zebrostudio │ │ └── snappingscrollview │ │ └── ExampleInstrumentedTest.kt ├── proguard-rules.pro └── build.gradle ├── settings.gradle ├── snappingScroll.gif ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── .gitignore ├── gradle.properties ├── gradlew.bat ├── README.md └── gradlew /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /snappingscrollview/consumer-rules.pro: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /snappingscrollview/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app', ':snappingscrollview' 2 | rootProject.name='SnappingScrollView' 3 | -------------------------------------------------------------------------------- /snappingScroll.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/abhriyaroy/SnappingScrollView/HEAD/snappingScroll.gif -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | SnappingScrollView 3 | 4 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/abhriyaroy/SnappingScrollView/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /snappingscrollview/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | SnappingScrollView 3 | 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/ 5 | .DS_Store 6 | /build 7 | /captures 8 | .externalNativeBuild 9 | .cxx 10 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/abhriyaroy/SnappingScrollView/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/abhriyaroy/SnappingScrollView/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xhdpi/ic_launcher.png: 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-------------------------------------------------------------------------------- https://raw.githubusercontent.com/abhriyaroy/SnappingScrollView/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/abhriyaroy/SnappingScrollView/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/abhriyaroy/SnappingScrollView/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/abhriyaroy/SnappingScrollView/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/abhriyaroy/SnappingScrollView/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /snappingscrollview/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #008577 4 | #00574B 5 | #D81B60 6 | 7 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Tue Feb 18 22:03:24 IST 2020 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-5.4.1-all.zip 7 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/test/java/com/zebrostudio/snappingscrollviewexample/ExampleUnitTest.kt: -------------------------------------------------------------------------------- 1 | package com.zebrostudio.snappingscrollviewexample 2 | 3 | import org.junit.Test 4 | 5 | import org.junit.Assert.* 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * See [testing documentation](http://d.android.com/tools/testing). 11 | */ 12 | class ExampleUnitTest { 13 | @Test 14 | fun addition_isCorrect() { 15 | assertEquals(4, 2 + 2) 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /snappingscrollview/src/test/java/com/zebrostudio/snappingscrollview/ExampleUnitTest.kt: -------------------------------------------------------------------------------- 1 | package com.zebrostudio.snappingscrollview 2 | 3 | import org.junit.Test 4 | 5 | import org.junit.Assert.* 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * See [testing documentation](http://d.android.com/tools/testing). 11 | */ 12 | class ExampleUnitTest { 13 | @Test 14 | fun addition_isCorrect() { 15 | assertEquals(4, 2 + 2) 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /snappingscrollview/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/androidTest/java/com/zebrostudio/snappingscrollviewexample/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.zebrostudio.snappingscrollviewexample 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.zebrostudio.snappingscrollview", appContext.packageName) 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /snappingscrollview/src/androidTest/java/com/zebrostudio/snappingscrollview/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.zebrostudio.snappingscrollview 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.zebrostudio.snappingscrollview.test", appContext.packageName) 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /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/java/com/zebrostudio/snappingscrollviewexample/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.zebrostudio.snappingscrollviewexample 2 | 3 | import android.os.Build 4 | import android.os.Bundle 5 | import android.view.ViewTreeObserver 6 | import androidx.appcompat.app.AppCompatActivity 7 | import kotlinx.android.synthetic.main.activity_main.* 8 | 9 | class MainActivity : AppCompatActivity() { 10 | 11 | override fun onCreate(savedInstanceState: Bundle?) { 12 | super.onCreate(savedInstanceState) 13 | setContentView(R.layout.activity_main) 14 | snappingScrollView.viewTreeObserver.addOnGlobalLayoutListener(object : 15 | ViewTreeObserver.OnGlobalLayoutListener { 16 | override fun onGlobalLayout() { 17 | // Remove the layout listener 18 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 19 | snappingScrollView.viewTreeObserver.removeOnGlobalLayoutListener(this) 20 | } else { 21 | snappingScrollView.viewTreeObserver.removeGlobalOnLayoutListener(this) 22 | } 23 | // Set the view to be snapped on scrolling 24 | snappingScrollView.setSnappingView(view2) 25 | } 26 | }) 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | apply plugin: 'kotlin-android' 4 | 5 | apply plugin: 'kotlin-android-extensions' 6 | 7 | android { 8 | compileSdkVersion 29 9 | buildToolsVersion "29.0.3" 10 | defaultConfig { 11 | applicationId "com.zebrostudio.snappingscrollview" 12 | minSdkVersion 15 13 | targetSdkVersion 29 14 | versionCode 1 15 | versionName "1.0" 16 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 17 | } 18 | buildTypes { 19 | release { 20 | minifyEnabled false 21 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 22 | } 23 | } 24 | } 25 | 26 | dependencies { 27 | implementation fileTree(dir: 'libs', include: ['*.jar']) 28 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 29 | implementation 'androidx.appcompat:appcompat:1.1.0' 30 | implementation 'androidx.core:core-ktx:1.2.0' 31 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3' 32 | 33 | implementation project(':snappingscrollview') 34 | testImplementation 'junit:junit:4.12' 35 | androidTestImplementation 'androidx.test.ext:junit:1.1.0' 36 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1' 37 | } 38 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 16 | 17 | 21 | 22 | 26 | 27 | 32 | 33 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | -------------------------------------------------------------------------------- /snappingscrollview/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.library' 2 | apply plugin: 'kotlin-android' 3 | apply plugin: 'kotlin-android-extensions' 4 | apply plugin: 'com.novoda.bintray-release' 5 | 6 | 7 | publish { 8 | def groupProjectID = 'com.zebrostudio.snappingscrollview' 9 | def artifactProjectID = 'snappingscrollview' 10 | def publishVersionID = '1.0.0' 11 | 12 | userOrg = 'abhriyaroy' 13 | repoName = 'SnappingScrollView' 14 | groupId = groupProjectID 15 | artifactId = artifactProjectID 16 | publishVersion = publishVersionID 17 | desc = 'A scrollview for Android that follows drag path and snaps to the top or bottom.' 18 | website = 'https://github.com/abhriyaroy/SnappingScrollView' 19 | } 20 | 21 | android { 22 | compileSdkVersion 29 23 | buildToolsVersion "29.0.3" 24 | 25 | 26 | defaultConfig { 27 | minSdkVersion 15 28 | targetSdkVersion 29 29 | versionCode 1 30 | versionName "1.0" 31 | 32 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 33 | consumerProguardFiles 'consumer-rules.pro' 34 | } 35 | 36 | buildTypes { 37 | release { 38 | minifyEnabled false 39 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 40 | } 41 | } 42 | 43 | } 44 | 45 | dependencies { 46 | implementation fileTree(dir: 'libs', include: ['*.jar']) 47 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 48 | implementation 'androidx.appcompat:appcompat:1.1.0' 49 | implementation 'androidx.core:core-ktx:1.2.0' 50 | testImplementation 'junit:junit:4.12' 51 | androidTestImplementation 'androidx.test.ext:junit:1.1.0' 52 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1' 53 | } 54 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /snappingscrollview/src/main/java/com/zebrostudio/snappingscrollview/SnappingScrollView.kt: -------------------------------------------------------------------------------- 1 | package com.zebrostudio.snappingscrollview 2 | 3 | import android.animation.ObjectAnimator 4 | import android.content.Context 5 | import android.util.AttributeSet 6 | import android.view.MotionEvent 7 | import android.view.View 8 | import android.view.animation.DecelerateInterpolator 9 | import androidx.core.widget.NestedScrollView 10 | 11 | private const val DELAY_MILLIS = 40L 12 | private const val SCROLLY_PROPERTY = "scrollY" 13 | 14 | class SnappingScrollView : NestedScrollView { 15 | 16 | private var mOnScrollChangedListener: OnScrollChangedListener? = null 17 | private var snappingView: View? = null 18 | private var offset = 0f 19 | private var wasActionMoveStarted = false 20 | private var startY = 0 21 | private var endY = 0 22 | private var flingListener: OnFlingListener? = null 23 | private var scrollChecker: Runnable? = null 24 | private var mPreviousPosition: Int = 0 25 | private var flingStartingPosition = 0 26 | private var isScrollable: Boolean = true 27 | 28 | interface OnScrollChangedListener { 29 | fun onScrollChanged(isExpanded: Boolean, newY: Int) 30 | } 31 | 32 | interface OnFlingListener { 33 | fun onFlingStarted() 34 | fun onFlingStopped() 35 | } 36 | 37 | constructor(context: Context) : super(context) { 38 | initScrollChecker() 39 | } 40 | 41 | constructor(context: Context, attrs: AttributeSet) : super(context, attrs) { 42 | initScrollChecker() 43 | } 44 | 45 | constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super( 46 | context, 47 | attrs, 48 | defStyle 49 | ) { 50 | initScrollChecker() 51 | } 52 | 53 | override fun onScrollChanged(l: Int, t: Int, oldl: Int, oldt: Int) { 54 | super.onScrollChanged(l, t, oldl, oldt) 55 | if (scrollY in offset..0f && (oldt - t) > 0) { 56 | smoothScrollTo(0, 0) 57 | } 58 | if (mOnScrollChangedListener != null) { 59 | mOnScrollChangedListener!!.onScrollChanged(scrollY >= offset, scrollY) 60 | } 61 | } 62 | 63 | override fun onTouchEvent(ev: MotionEvent): Boolean { 64 | return when (ev.action) { 65 | MotionEvent.ACTION_MOVE -> { 66 | if (!wasActionMoveStarted) { 67 | wasActionMoveStarted = true 68 | startY = scrollY 69 | } 70 | isScrollable && super.onTouchEvent(ev) 71 | } 72 | MotionEvent.ACTION_UP -> { 73 | endY = scrollY 74 | wasActionMoveStarted = false 75 | if ((endY - startY >= 50) && scrollY < offset) { 76 | slowSmoothScrollTo(offset.toInt()) 77 | false 78 | } else if ((endY - startY < 50) && scrollY < offset) { 79 | smoothScrollTo(0, 0) 80 | false 81 | } else { 82 | isScrollable && super.onTouchEvent(ev) 83 | } 84 | } 85 | else -> isScrollable && super.onTouchEvent(ev) 86 | } 87 | } 88 | 89 | override fun fling(velocityY: Int) { 90 | super.fling(velocityY) 91 | if (flingListener != null) { 92 | flingListener?.onFlingStarted() 93 | handler.post(scrollChecker) 94 | } 95 | } 96 | 97 | fun setOnScrollChangedListener(listener: OnScrollChangedListener) { 98 | mOnScrollChangedListener = listener 99 | } 100 | 101 | fun setSnappingView(view: View) { 102 | snappingView = view 103 | offset = view.y 104 | flingListener = object : OnFlingListener { 105 | override fun onFlingStarted() { 106 | flingStartingPosition = scrollY 107 | } 108 | 109 | override fun onFlingStopped() { 110 | if (scrollY < offset.toInt() && flingStartingPosition - scrollY > 0) { 111 | smoothScrollTo(0, 0) 112 | } 113 | } 114 | } 115 | } 116 | 117 | fun setScrollingEnabled(enabled: Boolean) { 118 | isScrollable = enabled 119 | } 120 | 121 | private fun initScrollChecker() { 122 | scrollChecker = Runnable { 123 | val position = scrollY 124 | if (mPreviousPosition - position == 0) { 125 | flingListener?.onFlingStopped() 126 | removeCallbacks(scrollChecker) 127 | } else { 128 | mPreviousPosition = scrollY 129 | postDelayed(scrollChecker, DELAY_MILLIS) 130 | } 131 | } 132 | } 133 | 134 | private fun slowSmoothScrollTo(scrollTo: Int) { 135 | ObjectAnimator.ofInt(this, SCROLLY_PROPERTY, scrollY, scrollTo).apply { 136 | duration = 150 137 | interpolator = DecelerateInterpolator() 138 | }.start() 139 | } 140 | } 141 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # SnappingScrollView 2 | A custom scrollview implementation for Android that follows drag path and snaps to the top or bottom. 3 | 4 | ## Table of Contents 5 | - [Introduction](#introduction) 6 | - [Sample](#sample) 7 | - [Installation](#installation) 8 | - [Library Details](#library-details) 9 | - [Usage Examples](#usage-examples) 10 | - [How to Contribute](#how-to-contribute) 11 | - [About the Author](#about-the-author) 12 | - [License](#license) 13 | 14 | ## Introduction 15 | 16 | SnappingScrollView serves as an improvement over the default scrollview implementation of android by bringing `Bottom Sheet` like `snapping` behaviour to the scrollview. 17 | 18 | ## Sample 19 |

20 | 21 |

22 | 23 | ## Installation 24 | 25 | [![Download](https://api.bintray.com/packages/abhriyaroy/SnappingScrollView/snappingscrollview/images/download.svg)](https://bintray.com/abhriyaroy/SnappingScrollView/snappingscrollview/_latestVersion) 26 | 27 | Add the dependency in your app module's build.gradle file 28 | 29 | dependencies { 30 | ... 31 | implementation "com.zebrostudio.snappingscrollview:snappingscrollview:{latest_version}" 32 | } 33 | 34 | ## Library Details 35 | 36 | - Extends the scrollview class 37 | - Min sdk 15 38 | - Written in kotlin 39 | - Offers disable scroll helper method 40 | 41 | ## Usage Example 42 | 43 | Add to your layout in your `XML` file - 44 | 45 | 50 | 51 | 55 | 56 | 60 | 61 | 66 | 67 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | And then in your class file add to you `onCreate()` or any other lifecycle method - 79 | 80 | snappingScrollView.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener { 81 | override fun onGlobalLayout() { 82 | // Remove the layout listener 83 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 84 | snappingScrollView.viewTreeObserver.removeOnGlobalLayoutListener(this) 85 | } else { 86 | snappingScrollView.viewTreeObserver.removeGlobalOnLayoutListener(this) 87 | } 88 | // Set the view to be snapped on scrolling 89 | snappingScrollView.setSnappingView(view2) 90 | } 91 | }) 92 | 93 | ## How to Contribute 94 | 95 | Please feel free to raise an Issue/Pr in-case you come across a bug or even if you have any minor suggestion. 96 | 97 | ## About the Author 98 | 99 | ### Abhriya Roy 100 | 101 | Android Developer with 2 years of experience in building apps that look and feel great. 102 | Enthusiastic towards writing clean and maintainable code. 103 | Open source contributor. 104 | 105 | LinkedIn   106 | Twitter 107 |   108 | Stack Overflow 109 |   110 | Angel List 111 |   112 | Angel List 113 | 114 |
115 | 116 | ## License 117 | 118 | Copyright 2020 Abhriya Roy 119 | 120 | Licensed under the Apache License, Version 2.0 (the "License"); 121 | you may not use this file except in compliance with the License. 122 | You may obtain a copy of the License at 123 | 124 | http://www.apache.org/licenses/LICENSE-2.0 125 | 126 | Unless required by applicable law or agreed to in writing, software 127 | distributed under the License is distributed on an "AS IS" BASIS, 128 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 129 | See the License for the specific language governing permissions and 130 | limitations under the License. 131 | -------------------------------------------------------------------------------- /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 | --------------------------------------------------------------------------------