├── .gitignore ├── LICENSE ├── README-zh.md ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── li │ │ └── yohan │ │ └── parallaxviewpager │ │ └── ExampleInstrumentedTest.java │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ ├── com │ │ │ └── jakewharton │ │ │ │ └── salvage │ │ │ │ ├── RecycleBin.java │ │ │ │ └── RecyclingPagerAdapter.java │ │ └── li │ │ │ └── yohan │ │ │ └── parallaxviewpager │ │ │ └── MainActivity.java │ └── res │ │ ├── drawable-xxhdpi │ │ └── background.jpg │ │ ├── layout │ │ └── activity_main.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 │ │ └── values │ │ ├── colors.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── li │ └── yohan │ └── parallaxviewpager │ └── ExampleUnitTest.java ├── art ├── rate_0.5.gif └── rate_1.gif ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── library ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── li │ │ └── yohan │ │ └── parallax │ │ └── ParallaxViewPager.java │ └── res │ └── values │ ├── attrs.xml │ └── strings.xml └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | # Built application files 2 | *.apk 3 | *.ap_ 4 | 5 | # Files for the Dalvik VM 6 | *.dex 7 | 8 | # Java class files 9 | *.class 10 | 11 | # Generated files 12 | bin/ 13 | gen/ 14 | 15 | # Gradle files 16 | .gradle/ 17 | build/ 18 | /*/build/ 19 | 20 | # Local configuration file (sdk path, etc) 21 | local.properties 22 | 23 | # Proguard folder generated by Eclipse 24 | proguard/ 25 | 26 | # Log Files 27 | *.log 28 | 29 | .DS_Store 30 | /.idea 31 | *.iml -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright 2016 demoNo 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README-zh.md: -------------------------------------------------------------------------------- 1 | # ParallaxViewPager 2 | 3 | [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) 4 | [![](https://jitpack.io/v/demoNo/ParallaxViewPager.svg)](https://jitpack.io/#demoNo/ParallaxViewPager) 5 | 6 | README: [English](https://github.com/demoNo/ParallaxViewPager/blob/master/README.md) 7 | 8 | 图 1
前景速度是背景速度的2倍 当前 `speedRatio = 0.5` | 图 2
前后速度一致（会有些误差），当前 `speedRatio = 1` 9 | ---|--- 10 | ![](https://raw.githubusercontent.com/demoNo/ParallaxViewPager/master/art/rate_0.5.gif) | ![](https://raw.githubusercontent.com/demoNo/ParallaxViewPager/master/art/rate_1.gif) 11 | 12 | ## 添加依赖 13 | 14 | Gradle 15 | 16 | * 在工程的根目录`build.gralde`配置 17 | ```Gradle 18 | allprojects { 19 | repositories { 20 | ... 21 | maven { url 'https://jitpack.io' } 22 | } 23 | } 24 | ``` 25 | 26 | * 在app目录的`build.gralde`配置 27 | ```Gradle 28 | dependencies { 29 | compile 'com.github.demoNo:ParallaxViewPager:v1.0.0' 30 | } 31 | ``` 32 | 33 | ## 使用 34 | 35 | * 像正常使用ViewPager一样 36 | 37 | ```xml 38 | 42 | ``` 43 | 44 | ```Java 45 | ParallaxViewPager mPager = ((ParallaxViewPager) findViewById(R.id.pager)); 46 | mPager.setAdapter(new Adapter()); 47 | ``` 48 | 49 | 设置背景的方式和普通的 `ViewPager` 基本一致 50 | 51 | 在xml中设置 52 | 53 | `android:background="@drawable/background"` 54 | 55 | 或者在代码中设置 56 | ```Java 57 | setBackgroundResource(int resid) 58 | setBackground(Drawable background) 59 | ``` 60 | 61 | 62 | ## 设置 63 | 64 | * 在xml中设置速率比 65 | ```diff 66 | 71 | ``` 72 | * 在代码中设置速率比 73 | ```diff 74 | ParallaxViewPager mPager = ((ParallaxViewPager) findViewById(R.id.pager)); 75 | mPager.setAdapter(new Adapter()); 76 | +mPager.setSpeedRatio(0.5f); 77 | ``` 78 | 79 | > **默认的速率比是0.5** 80 | 81 | ## 限制 82 | 83 | 1. 背景图片宽度应该大于高度 84 | 2. 背景图片的宽度应该大于 ViewPager 的宽度 85 | 3. ViewPager 不能设置padding 86 | 4. 如果速率比设置不对的话，会自动设置一个合适的值保证图片不会出现超出边界的问题 87 | 88 | ## Licence 89 | 90 | > Apache License, Version 2.0 91 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ParallaxViewPager 2 | 3 | [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) 4 | [![](https://jitpack.io/v/demoNo/ParallaxViewPager.svg)](https://jitpack.io/#demoNo/ParallaxViewPager) 5 | 6 | [中文](https://github.com/demoNo/ParallaxViewPager/blob/master/README-zh.md) 7 | 8 | The first gif
`foreground speed = 2*background speed` witch is `speedRatio = 0.5` | the second gif
`foreground speed = background speed` witch is `speedRatio = 1` 9 | ---|--- 10 | ![](https://raw.githubusercontent.com/demoNo/ParallaxViewPager/master/art/rate_0.5.gif) | ![](https://raw.githubusercontent.com/demoNo/ParallaxViewPager/master/art/rate_1.gif) 11 | 12 | ## Add to your project 13 | 14 | Gradle 15 | 16 | * Add it in your root build.gradle at the end of repositories: 17 | ```Gradle 18 | allprojects { 19 | repositories { 20 | ... 21 | maven { url 'https://jitpack.io' } 22 | } 23 | } 24 | ``` 25 | 26 | * Add the dependency 27 | ```Gradle 28 | dependencies { 29 | compile 'com.github.demoNo:ParallaxViewPager:v1.0.0' 30 | } 31 | ``` 32 | 33 | 34 | Maven 35 | 36 | * Add the JitPack repository to your build file 37 | ```xml 38 | 39 | 40 | jitpack.io 41 | https://jitpack.io 42 | 43 | 44 | ``` 45 | 46 | * Add the dependency 47 | ```xml 48 | 49 | com.github.demoNo 50 | ParallaxViewPager 51 | v1.0.0 52 | 53 | ``` 54 | 55 | ## Usage 56 | 57 | * Just like normal ViewPager 58 | 59 | ```xml 60 | 64 | ``` 65 | 66 | ```Java 67 | ParallaxViewPager mPager = ((ParallaxViewPager) findViewById(R.id.pager)); 68 | mPager.setAdapter(new Adapter()); 69 | ``` 70 | 71 | set background image just like ViewPager. 72 | 73 | you can set in xml 74 | 75 | `android:background="@drawable/background"` 76 | 77 | or in code 78 | ```Java 79 | setBackgroundResource(int resid) 80 | setBackground(Drawable background) 81 | ``` 82 | 83 | ## Configuration 84 | 85 | * you can set speed ratio in xml 86 | ```diff 87 | 92 | ``` 93 | * also set in code 94 | ```diff 95 | ParallaxViewPager mPager = ((ParallaxViewPager) findViewById(R.id.pager)); 96 | mPager.setAdapter(new Adapter()); 97 | +mPager.setSpeedRatio(0.5f); 98 | ``` 99 | 100 | > **Note: the default ratio is 0.5f** 101 | 102 | ## Restrictions 103 | 104 | 1. The background image's width should larger than height. 105 | 2. The background image's width should larger than ViewPager's width. 106 | 3. You can't set pager with padding. 107 | 4. If the ratio that user set is not proper, it will be recalculate and reset. 108 | 109 | ## Licence 110 | 111 | > Apache License, Version 2.0 112 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 25 5 | buildToolsVersion "25.0.2" 6 | defaultConfig { 7 | applicationId "li.yohan.parallaxviewpager" 8 | minSdkVersion 9 9 | targetSdkVersion 25 10 | versionCode 1 11 | versionName "1.0" 12 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 13 | } 14 | buildTypes { 15 | release { 16 | minifyEnabled false 17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 18 | } 19 | } 20 | } 21 | 22 | dependencies { 23 | compile fileTree(dir: 'libs', include: ['*.jar']) 24 | androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 25 | exclude group: 'com.android.support', module: 'support-annotations' 26 | }) 27 | compile 'com.android.support:appcompat-v7:25.3.1' 28 | compile 'com.android.support.constraint:constraint-layout:1.0.2' 29 | compile project(':library') 30 | } 31 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in /Users/yohan/Library/Android/sdk/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | 19 | # Uncomment this to preserve the line number information for 20 | # debugging stack traces. 21 | #-keepattributes SourceFile,LineNumberTable 22 | 23 | # If you keep the line number information, uncomment this to 24 | # hide the original source file name. 25 | #-renamesourcefileattribute SourceFile 26 | -------------------------------------------------------------------------------- /app/src/androidTest/java/li/yohan/parallaxviewpager/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package li.yohan.parallaxviewpager; 2 | 3 | import android.content.Context; 4 | import android.support.test.InstrumentationRegistry; 5 | import android.support.test.runner.AndroidJUnit4; 6 | 7 | import org.junit.Test; 8 | import org.junit.runner.RunWith; 9 | 10 | import static org.junit.Assert.*; 11 | 12 | /** 13 | * Instrumentation test, which will execute on an Android device. 14 | * 15 | * @see Testing documentation 16 | */ 17 | @RunWith(AndroidJUnit4.class) 18 | public class ExampleInstrumentedTest { 19 | @Test 20 | public void useAppContext() throws Exception { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("li.yohan.parallaxviewpager", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /app/src/main/java/com/jakewharton/salvage/RecycleBin.java: -------------------------------------------------------------------------------- 1 | package com.jakewharton.salvage; 2 | 3 | import android.os.Build; 4 | import android.util.SparseArray; 5 | import android.view.View; 6 | 7 | /** 8 | * The RecycleBin facilitates reuse of views across layouts. The RecycleBin has two levels of 9 | * storage: ActiveViews and ScrapViews. ActiveViews are those views which were onscreen at the 10 | * start of a layout. By construction, they are displaying current information. At the end of 11 | * layout, all views in ActiveViews are demoted to ScrapViews. ScrapViews are old views that 12 | * could potentially be used by the adapter to avoid allocating views unnecessarily. 13 | *

14 | * This class was taken from Android's implementation of {@link android.widget.AbsListView} which 15 | * is copyrighted 2006 The Android Open Source Project. 16 | */ 17 | public class RecycleBin { 18 | /** 19 | * Views that were on screen at the start of layout. This array is populated at the start of 20 | * layout, and at the end of layout all view in activeViews are moved to scrapViews. 21 | * Views in activeViews represent a contiguous range of Views, with position of the first 22 | * view store in mFirstActivePosition. 23 | */ 24 | private View[] activeViews = new View[0]; 25 | private int[] activeViewTypes = new int[0]; 26 | 27 | /** Unsorted views that can be used by the adapter as a convert view. */ 28 | private SparseArray[] scrapViews; 29 | 30 | private int viewTypeCount; 31 | 32 | private SparseArray currentScrapViews; 33 | 34 | public void setViewTypeCount(int viewTypeCount) { 35 | if (viewTypeCount < 1) { 36 | throw new IllegalArgumentException("Can't have a viewTypeCount < 1"); 37 | } 38 | //noinspection unchecked 39 | SparseArray[] scrapViews = new SparseArray[viewTypeCount]; 40 | for (int i = 0; i < viewTypeCount; i++) { 41 | scrapViews[i] = new SparseArray(); 42 | } 43 | this.viewTypeCount = viewTypeCount; 44 | currentScrapViews = scrapViews[0]; 45 | this.scrapViews = scrapViews; 46 | } 47 | 48 | protected boolean shouldRecycleViewType(int viewType) { 49 | return viewType >= 0; 50 | } 51 | 52 | /** @return A view from the ScrapViews collection. These are unordered. */ 53 | View getScrapView(int position, int viewType) { 54 | if (viewTypeCount == 1) { 55 | return retrieveFromScrap(currentScrapViews, position); 56 | } else if (viewType >= 0 && viewType < scrapViews.length) { 57 | return retrieveFromScrap(scrapViews[viewType], position); 58 | } 59 | return null; 60 | } 61 | 62 | /** 63 | * Put a view into the ScrapViews list. These views are unordered. 64 | * 65 | * @param scrap The view to add 66 | */ 67 | void addScrapView(View scrap, int position, int viewType) { 68 | if (viewTypeCount == 1) { 69 | currentScrapViews.put(position, scrap); 70 | } else { 71 | scrapViews[viewType].put(position, scrap); 72 | } 73 | 74 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 75 | scrap.setAccessibilityDelegate(null); 76 | } 77 | } 78 | 79 | /** Move all views remaining in activeViews to scrapViews. */ 80 | void scrapActiveViews() { 81 | final View[] activeViews = this.activeViews; 82 | final int[] activeViewTypes = this.activeViewTypes; 83 | final boolean multipleScraps = viewTypeCount > 1; 84 | 85 | SparseArray scrapViews = currentScrapViews; 86 | final int count = activeViews.length; 87 | for (int i = count - 1; i >= 0; i--) { 88 | final View victim = activeViews[i]; 89 | if (victim != null) { 90 | int whichScrap = activeViewTypes[i]; 91 | 92 | activeViews[i] = null; 93 | activeViewTypes[i] = -1; 94 | 95 | if (!shouldRecycleViewType(whichScrap)) { 96 | continue; 97 | } 98 | 99 | if (multipleScraps) { 100 | scrapViews = this.scrapViews[whichScrap]; 101 | } 102 | scrapViews.put(i, victim); 103 | 104 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 105 | victim.setAccessibilityDelegate(null); 106 | } 107 | } 108 | } 109 | 110 | pruneScrapViews(); 111 | } 112 | 113 | /** 114 | * Makes sure that the size of scrapViews does not exceed the size of activeViews. 115 | * (This can happen if an adapter does not recycle its views). 116 | */ 117 | private void pruneScrapViews() { 118 | final int maxViews = activeViews.length; 119 | final int viewTypeCount = this.viewTypeCount; 120 | final SparseArray[] scrapViews = this.scrapViews; 121 | for (int i = 0; i < viewTypeCount; ++i) { 122 | final SparseArray scrapPile = scrapViews[i]; 123 | int size = scrapPile.size(); 124 | final int extras = size - maxViews; 125 | size--; 126 | for (int j = 0; j < extras; j++) { 127 | scrapPile.remove(scrapPile.keyAt(size--)); 128 | } 129 | } 130 | } 131 | 132 | static View retrieveFromScrap(SparseArray scrapViews, int position) { 133 | int size = scrapViews.size(); 134 | if (size > 0) { 135 | // See if we still have a view for this position. 136 | for (int i = 0; i < size; i++) { 137 | int fromPosition = scrapViews.keyAt(i); 138 | View view = scrapViews.get(fromPosition); 139 | if (fromPosition == position) { 140 | scrapViews.remove(fromPosition); 141 | return view; 142 | } 143 | } 144 | int index = size - 1; 145 | View r = scrapViews.valueAt(index); 146 | scrapViews.remove(scrapViews.keyAt(index)); 147 | return r; 148 | } else { 149 | return null; 150 | } 151 | } 152 | } 153 | -------------------------------------------------------------------------------- /app/src/main/java/com/jakewharton/salvage/RecyclingPagerAdapter.java: -------------------------------------------------------------------------------- 1 | package com.jakewharton.salvage; 2 | 3 | import android.support.v4.view.PagerAdapter; 4 | import android.view.View; 5 | import android.view.ViewGroup; 6 | import android.widget.AdapterView; 7 | 8 | /** 9 | * A {@link PagerAdapter} which behaves like an {@link android.widget.Adapter} with view types and 10 | * view recycling. 11 | */ 12 | public abstract class RecyclingPagerAdapter extends PagerAdapter { 13 | static final int IGNORE_ITEM_VIEW_TYPE = AdapterView.ITEM_VIEW_TYPE_IGNORE; 14 | 15 | private final RecycleBin recycleBin; 16 | 17 | public RecyclingPagerAdapter() { 18 | this(new RecycleBin()); 19 | } 20 | 21 | RecyclingPagerAdapter(RecycleBin recycleBin) { 22 | this.recycleBin = recycleBin; 23 | recycleBin.setViewTypeCount(getViewTypeCount()); 24 | } 25 | 26 | @Override public void notifyDataSetChanged() { 27 | recycleBin.scrapActiveViews(); 28 | super.notifyDataSetChanged(); 29 | } 30 | 31 | @Override public final Object instantiateItem(ViewGroup container, int position) { 32 | int viewType = getItemViewType(position); 33 | View view = null; 34 | if (viewType != IGNORE_ITEM_VIEW_TYPE) { 35 | view = recycleBin.getScrapView(position, viewType); 36 | } 37 | view = getView(position, view, container); 38 | container.addView(view); 39 | return view; 40 | } 41 | 42 | @Override public final void destroyItem(ViewGroup container, int position, Object object) { 43 | View view = (View) object; 44 | container.removeView(view); 45 | int viewType = getItemViewType(position); 46 | if (viewType != IGNORE_ITEM_VIEW_TYPE) { 47 | recycleBin.addScrapView(view, position, viewType); 48 | } 49 | } 50 | 51 | @Override public final boolean isViewFromObject(View view, Object object) { 52 | return view == object; 53 | } 54 | 55 | /** 56 | *

57 | * Returns the number of types of Views that will be created by 58 | * {@link #getView}. Each type represents a set of views that can be 59 | * converted in {@link #getView}. If the adapter always returns the same 60 | * type of View for all items, this method should return 1. 61 | *

62 | *

63 | * This method will only be called when when the adapter is set on the 64 | * the {@link AdapterView}. 65 | *

66 | * 67 | * @return The number of types of Views that will be created by this adapter 68 | */ 69 | public int getViewTypeCount() { 70 | return 1; 71 | } 72 | 73 | /** 74 | * Get the type of View that will be created by {@link #getView} for the specified item. 75 | * 76 | * @param position The position of the item within the adapter's data set whose view type we 77 | * want. 78 | * @return An integer representing the type of View. Two views should share the same type if one 79 | * can be converted to the other in {@link #getView}. Note: Integers must be in the 80 | * range 0 to {@link #getViewTypeCount} - 1. {@link #IGNORE_ITEM_VIEW_TYPE} can 81 | * also be returned. 82 | * @see #IGNORE_ITEM_VIEW_TYPE 83 | */ 84 | @SuppressWarnings("UnusedParameters") // Argument potentially used by subclasses. 85 | public int getItemViewType(int position) { 86 | return 0; 87 | } 88 | 89 | /** 90 | * Get a View that displays the data at the specified position in the data set. You can either 91 | * create a View manually or inflate it from an XML layout file. When the View is inflated, the 92 | * parent View (GridView, ListView...) will apply default layout parameters unless you use 93 | * {@link android.view.LayoutInflater#inflate(int, ViewGroup, boolean)} 94 | * to specify a root view and to prevent attachment to the root. 95 | * 96 | * @param position The position of the item within the adapter's data set of the item whose view 97 | * we want. 98 | * @param convertView The old view to reuse, if possible. Note: You should check that this view 99 | * is non-null and of an appropriate type before using. If it is not possible to convert 100 | * this view to display the correct data, this method can create a new view. 101 | * Heterogeneous lists can specify their number of view types, so that this View is 102 | * always of the right type (see {@link #getViewTypeCount()} and 103 | * {@link #getItemViewType(int)}). 104 | * @param parent The parent that this view will eventually be attached to 105 | * @return A View corresponding to the data at the specified position. 106 | */ 107 | public abstract View getView(int position, View convertView, ViewGroup container); 108 | } 109 | -------------------------------------------------------------------------------- /app/src/main/java/li/yohan/parallaxviewpager/MainActivity.java: -------------------------------------------------------------------------------- 1 | package li.yohan.parallaxviewpager; 2 | 3 | import android.graphics.Color; 4 | import android.graphics.Typeface; 5 | import android.os.Bundle; 6 | import android.support.v7.app.AppCompatActivity; 7 | import android.util.TypedValue; 8 | import android.view.Gravity; 9 | import android.view.View; 10 | import android.view.ViewGroup; 11 | import android.widget.TextView; 12 | 13 | import com.jakewharton.salvage.RecyclingPagerAdapter; 14 | 15 | import li.yohan.parallax.ParallaxViewPager; 16 | 17 | 18 | public class MainActivity extends AppCompatActivity { 19 | 20 | private ParallaxViewPager mPager; 21 | 22 | @Override 23 | protected void onCreate(Bundle savedInstanceState) { 24 | super.onCreate(savedInstanceState); 25 | setContentView(R.layout.activity_main); 26 | mPager = ((ParallaxViewPager) findViewById(R.id.pager)); 27 | mPager.setAdapter(new Adapter()); 28 | } 29 | 30 | class Adapter extends RecyclingPagerAdapter { 31 | 32 | @Override 33 | public View getView(int position, View convertView, ViewGroup container) { 34 | if (convertView == null) { 35 | convertView = new TextView(container.getContext()); 36 | ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup 37 | .LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); 38 | ((TextView) convertView).setGravity(Gravity.CENTER); 39 | ((TextView) convertView).setTextSize(TypedValue.COMPLEX_UNIT_SP, 60); 40 | ((TextView) convertView).setTypeface(null, Typeface.BOLD); 41 | ((TextView) convertView).setTextColor(Color.parseColor("#ffffff")); 42 | convertView.setLayoutParams(layoutParams); 43 | } 44 | ((TextView) convertView).setText(position + ""); 45 | return convertView; 46 | } 47 | 48 | @Override 49 | public int getCount() { 50 | return 4; 51 | } 52 | } 53 | 54 | } 55 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-xxhdpi/background.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/drawable-xxhdpi/background.jpg -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-hdpi/ic_launcher_round.png 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https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #303F9F 5 | #FF4081 6 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | ParallaxViewPager 3 | 4 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/test/java/li/yohan/parallaxviewpager/ExampleUnitTest.java: -------------------------------------------------------------------------------- 1 | package li.yohan.parallaxviewpager; 2 | 3 | import org.junit.Test; 4 | 5 | import static org.junit.Assert.*; 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * @see Testing documentation 11 | */ 12 | public class ExampleUnitTest { 13 | @Test 14 | public void addition_isCorrect() throws Exception { 15 | assertEquals(4, 2 + 2); 16 | } 17 | } -------------------------------------------------------------------------------- /art/rate_0.5.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/art/rate_0.5.gif -------------------------------------------------------------------------------- /art/rate_1.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/art/rate_1.gif -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | // Top-level build file where you can add configuration options common to all sub-projects/modules. 2 | 3 | buildscript { 4 | repositories { 5 | jcenter() 6 | } 7 | dependencies { 8 | classpath 'com.android.tools.build:gradle:2.3.1' 9 | classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5' 10 | 11 | // NOTE: Do not place your application dependencies here; they belong 12 | // in the individual module build.gradle files 13 | } 14 | } 15 | 16 | allprojects { 17 | repositories { 18 | jcenter() 19 | } 20 | } 21 | 22 | task clean(type: Delete) { 23 | delete rootProject.buildDir 24 | } 25 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | 3 | # IDE (e.g. Android Studio) users: 4 | # Gradle settings configured through the IDE *will override* 5 | # any settings specified in this file. 6 | 7 | # For more details on how to configure your build environment visit 8 | # http://www.gradle.org/docs/current/userguide/build_environment.html 9 | 10 | # Specifies the JVM arguments used for the daemon process. 11 | # The setting is particularly useful for tweaking memory settings. 12 | org.gradle.jvmargs=-Xmx1536m 13 | 14 | # When configured, Gradle will run in incubating parallel mode. 15 | # This option should only be used with decoupled projects. More details, visit 16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 17 | # org.gradle.parallel=true 18 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/demoNo/ParallaxViewPager/7604ab4a6799a7a478396fc69ec4f077009a96d7/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Tue Apr 18 17:53:58 CST 2017 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-3.3-all.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /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 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 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 Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /library/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /library/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.library' 2 | //JitPack Maven 3 | apply plugin: 'com.github.dcendents.android-maven' 4 | 5 | group='com.github.demoNo' 6 | 7 | android { 8 | compileSdkVersion 25 9 | buildToolsVersion "25.0.2" 10 | 11 | defaultConfig { 12 | minSdkVersion 9 13 | targetSdkVersion 25 14 | versionCode 1 15 | versionName "1.0" 16 | } 17 | buildTypes { 18 | release { 19 | minifyEnabled false 20 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 21 | } 22 | } 23 | } 24 | 25 | dependencies { 26 | compile fileTree(dir: 'libs', include: ['*.jar']) 27 | compile 'com.android.support:support-core-ui:25.3.1' 28 | } 29 | -------------------------------------------------------------------------------- /library/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in /Users/yohan/Library/Android/sdk/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | 19 | # Uncomment this to preserve the line number information for 20 | # debugging stack traces. 21 | #-keepattributes SourceFile,LineNumberTable 22 | 23 | # If you keep the line number information, uncomment this to 24 | # hide the original source file name. 25 | #-renamesourcefileattribute SourceFile 26 | -------------------------------------------------------------------------------- /library/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /library/src/main/java/li/yohan/parallax/ParallaxViewPager.java: -------------------------------------------------------------------------------- 1 | package li.yohan.parallax; 2 | 3 | import android.content.Context; 4 | import android.content.res.TypedArray; 5 | import android.graphics.Bitmap; 6 | import android.graphics.BitmapFactory; 7 | import android.graphics.Canvas; 8 | import android.graphics.Rect; 9 | import android.graphics.drawable.BitmapDrawable; 10 | import android.graphics.drawable.Drawable; 11 | import android.support.annotation.DrawableRes; 12 | import android.support.v4.view.ViewPager; 13 | import android.util.AttributeSet; 14 | import android.util.Log; 15 | 16 | import li.yohan.library.R; 17 | 18 | /** 19 | * Created by yohan on 2017/4/18. 20 | */ 21 | 22 | public class ParallaxViewPager extends ViewPager { 23 | 24 | private static final String TAG = "ParallaxViewPager"; 25 | 26 | // bitmap source rect 27 | private Rect src = new Rect(); 28 | // bitmap destination rect 29 | private Rect dst = new Rect(); 30 | // background bitmap 31 | private Bitmap mBitmap; 32 | // bitmap each section width / pager page width 33 | private float ratio; 34 | // background bitmap move speed / page move speed 35 | private float speedRatio = DEFAULT_SPEED_RATIO; 36 | 37 | private static final float DEFAULT_SPEED_RATIO = 0.5f; 38 | 39 | // bitmap scale 40 | private float bitmapScale = 0.0f; 41 | 42 | private int oldCount = 0; 43 | 44 | public ParallaxViewPager(Context context, AttributeSet attrs) { 45 | super(context, attrs); 46 | if (getBackground() != null) { 47 | if (getBackground() instanceof BitmapDrawable) { 48 | mBitmap = ((BitmapDrawable) getBackground()).getBitmap(); 49 | } 50 | } 51 | if (attrs != null) { 52 | TypedArray array = context.obtainStyledAttributes(attrs, R.styleable 53 | .ParallaxViewPager, 0, 0); 54 | try { 55 | speedRatio = array.getFloat(R.styleable.ParallaxViewPager_speedRatio, 56 | DEFAULT_SPEED_RATIO); 57 | } finally { 58 | array.recycle(); 59 | } 60 | } 61 | initSource(); 62 | } 63 | 64 | @Override 65 | protected void onAttachedToWindow() { 66 | super.onAttachedToWindow(); 67 | addOnPageChangeListener(mOnPageChangeListener); 68 | } 69 | 70 | @Override 71 | protected void onDetachedFromWindow() { 72 | super.onDetachedFromWindow(); 73 | removeOnPageChangeListener(mOnPageChangeListener); 74 | } 75 | 76 | SimpleOnPageChangeListener mOnPageChangeListener = new SimpleOnPageChangeListener() { 77 | @Override 78 | public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 79 | super.onPageScrolled(position, positionOffset, positionOffsetPixels); 80 | if (mBitmap != null) { 81 | float offset = (position + positionOffset) * getMeasuredWidth(); 82 | src.left = ((int) (offset * ratio * speedRatio)); 83 | src.right = (int) (src.left + getMeasuredWidth() / bitmapScale); 84 | 85 | dst.left = (int) offset; 86 | dst.right = dst.left + getMeasuredWidth(); 87 | invalidate(); 88 | } 89 | } 90 | }; 91 | 92 | @Override 93 | public void setBackgroundResource(@DrawableRes int resid) { 94 | if (mBitmap == null) { 95 | mBitmap = BitmapFactory.decodeResource(getResources(), resid); 96 | initSource(); 97 | } 98 | } 99 | 100 | @Override 101 | public void setBackground(Drawable background) { 102 | if (mBitmap == null) { 103 | mBitmap = ((BitmapDrawable) background).getBitmap(); 104 | initSource(); 105 | } 106 | } 107 | 108 | @Override 109 | protected void onLayout(boolean changed, int l, int t, int r, int b) { 110 | super.onLayout(changed, l, t, r, b); 111 | if (getAdapter() != null && getAdapter().getCount() > 0 && mBitmap != null) { 112 | int curCount = getAdapter().getCount(); 113 | if (curCount != oldCount) { 114 | calculateRatio(); 115 | } 116 | oldCount = curCount; 117 | } 118 | } 119 | 120 | @Override 121 | protected void onSizeChanged(int w, int h, int oldw, int oldh) { 122 | super.onSizeChanged(w, h, oldw, oldh); 123 | // when size changed reConfig destination rect 124 | dst.left = 0; 125 | dst.right = w; 126 | dst.top = 0; 127 | dst.bottom = h; 128 | } 129 | 130 | /** 131 | * calculate the size and ratio after bitmap stretching 132 | */ 133 | private void calculateRatio() { 134 | if (mBitmap.getWidth() < getMeasuredWidth()) { 135 | Log.w(TAG, "Invalidate background bitmap, bitmap width must larger than ViewPager width"); 136 | } 137 | 138 | bitmapScale = ((float) getMeasuredHeight()) / ((float) mBitmap.getHeight()); 139 | src.right = (int) (getMeasuredWidth() / bitmapScale); 140 | 141 | int sectionWidth = mBitmap.getWidth() / getAdapter().getCount(); 142 | ratio = ((float) sectionWidth) / ((float) getMeasuredWidth()); 143 | 144 | // final source rect right edge 145 | int finalSourceRight = (int) (getMeasuredWidth() / bitmapScale + ((getAdapter().getCount 146 | () - 1) * getMeasuredWidth() * ratio * speedRatio)); 147 | if (finalSourceRight > mBitmap.getWidth()) { 148 | // lager than bitmap width then reset speedRatio 149 | speedRatio = (mBitmap.getWidth() - getMeasuredWidth() / bitmapScale) / ((getAdapter() 150 | .getCount() - 1) * getMeasuredWidth() * ratio); 151 | speedRatio = speedRatio <= 0 ? 1 : speedRatio; 152 | } 153 | } 154 | 155 | /** 156 | * init viewpager configuration 157 | */ 158 | private void initSource() { 159 | if (mBitmap != null) { 160 | src = new Rect(); 161 | src.top = 0; 162 | src.bottom = mBitmap.getHeight(); 163 | src.left = 0; 164 | } 165 | } 166 | 167 | /** 168 | * get background move speed ratio 169 | * 170 | * @return speed ratio 171 | */ 172 | public float getSpeedRatio() { 173 | return speedRatio; 174 | } 175 | 176 | /** 177 | * set background move speed ratio the lager the value the slower the speed vice versa, the 178 | * value must be between 0 and 1 179 | * 180 | * @param speedRatio 181 | */ 182 | public void setSpeedRatio(float speedRatio) { 183 | if (speedRatio <= 0 || speedRatio >= 1) 184 | throw new IllegalArgumentException("Illegal argument: speedRatio must be between 0 " + 185 | "and 1"); 186 | this.speedRatio = speedRatio; 187 | } 188 | 189 | @Override 190 | protected void onDraw(Canvas canvas) { 191 | super.onDraw(canvas); 192 | if (mBitmap != null) { 193 | canvas.drawBitmap(mBitmap, src, dst, null); 194 | } 195 | } 196 | } 197 | -------------------------------------------------------------------------------- /library/src/main/res/values/attrs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /library/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | Library 3 | 4 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app', ':library' 2 | --------------------------------------------------------------------------------