├── .gitignore ├── .idea ├── .name ├── compiler.xml ├── copyright │ └── profiles_settings.xml ├── encodings.xml ├── gradle.xml ├── misc.xml ├── modules.xml └── runConfigurations.xml ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── me │ │ └── chunyu │ │ └── spike │ │ └── wcl_snowfall_demo │ │ └── ApplicationTest.java │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── me │ │ │ └── chunyu │ │ │ └── spike │ │ │ └── wcl_snowfall_demo │ │ │ ├── MainActivity.java │ │ │ ├── RandomGenerator.java │ │ │ └── views │ │ │ ├── SnowFlake.java │ │ │ └── SnowView.java │ └── res │ │ ├── drawable │ │ └── christmas.png │ │ ├── layout │ │ └── activity_main.xml │ │ ├── mipmap-hdpi │ │ └── ic_launcher.png │ │ ├── mipmap-mdpi │ │ └── ic_launcher.png │ │ ├── mipmap-xhdpi │ │ └── ic_launcher.png │ │ ├── mipmap-xxhdpi │ │ └── ic_launcher.png │ │ ├── mipmap-xxxhdpi │ │ └── ic_launcher.png │ │ ├── values-v21 │ │ └── styles.xml │ │ ├── values-w820dp │ │ └── dimens.xml │ │ └── values │ │ ├── colors.xml │ │ ├── dimens.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── me │ └── chunyu │ └── spike │ └── wcl_snowfall_demo │ └── ExampleUnitTest.java ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/workspace.xml 5 | /.idea/libraries 6 | .DS_Store 7 | /build 8 | /captures 9 | -------------------------------------------------------------------------------- /.idea/.name: -------------------------------------------------------------------------------- 1 | wcl-snowfall-demo -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /.idea/copyright/profiles_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | -------------------------------------------------------------------------------- /.idea/encodings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 22 | 23 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | 14 | 26 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | Android 46 | 47 | 48 | Android Lint 49 | 50 | 51 | Java 52 | 53 | 54 | Java language level migration aidsJava 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 76 | 77 | 78 | 79 | 80 | 1.8 81 | 82 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 98 | 99 | 100 | 101 | 102 | 103 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # wcl-snowfall-demo 2 | 3 | 实现漫天飞雪的动画效果 4 | 5 | > 欢迎Follow我的[GitHub](https://github.com/SpikeKing) 6 | 7 | 博客: http://www.wangchenlong.org/ 8 | 9 | 本文: http://www.wangchenlong.org/2016/03/22/1603/222-snowflake-anim/ 10 | 11 | [参考文章](http://www.wangchenlong.org/2016/03/22/1603/222-snowflake-anim/) 12 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 'Google Inc.:Google APIs:23' 5 | buildToolsVersion "23.0.2" 6 | 7 | defaultConfig { 8 | applicationId "me.chunyu.spike.wcl_snowfall_demo" 9 | minSdkVersion 14 10 | targetSdkVersion 23 11 | versionCode 1 12 | versionName "1.0" 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 | testCompile 'junit:junit:4.12' 25 | compile 'com.android.support:appcompat-v7:23.1.0' 26 | compile 'com.android.support:design:23.1.0' 27 | } 28 | -------------------------------------------------------------------------------- /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/wangchenlong/Installations/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 | -------------------------------------------------------------------------------- /app/src/androidTest/java/me/chunyu/spike/wcl_snowfall_demo/ApplicationTest.java: -------------------------------------------------------------------------------- 1 | package me.chunyu.spike.wcl_snowfall_demo; 2 | 3 | import android.app.Application; 4 | import android.test.ApplicationTestCase; 5 | 6 | /** 7 | * Testing Fundamentals 8 | */ 9 | public class ApplicationTest extends ApplicationTestCase { 10 | public ApplicationTest() { 11 | super(Application.class); 12 | } 13 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 11 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /app/src/main/java/me/chunyu/spike/wcl_snowfall_demo/MainActivity.java: -------------------------------------------------------------------------------- 1 | package me.chunyu.spike.wcl_snowfall_demo; 2 | 3 | import android.os.Bundle; 4 | import android.support.v7.app.AppCompatActivity; 5 | 6 | public class MainActivity extends AppCompatActivity { 7 | 8 | @Override 9 | protected void onCreate(Bundle savedInstanceState) { 10 | super.onCreate(savedInstanceState); 11 | setContentView(R.layout.activity_main); 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /app/src/main/java/me/chunyu/spike/wcl_snowfall_demo/RandomGenerator.java: -------------------------------------------------------------------------------- 1 | package me.chunyu.spike.wcl_snowfall_demo; 2 | 3 | import java.util.Random; 4 | 5 | /** 6 | * 随机生成器 7 | *

8 | * Created by wangchenlong on 16/1/24. 9 | */ 10 | public class RandomGenerator { 11 | private static final Random RANDOM = new Random(); 12 | 13 | // 区间随机 14 | public float getRandom(float lower, float upper) { 15 | float min = Math.min(lower, upper); 16 | float max = Math.max(lower, upper); 17 | return getRandom(max - min) + min; 18 | } 19 | 20 | // 上界随机 21 | public float getRandom(float upper) { 22 | return RANDOM.nextFloat() * upper; 23 | } 24 | 25 | // 上界随机 26 | public int getRandom(int upper) { 27 | return RANDOM.nextInt(upper); 28 | } 29 | } 30 | 31 | -------------------------------------------------------------------------------- /app/src/main/java/me/chunyu/spike/wcl_snowfall_demo/views/SnowFlake.java: -------------------------------------------------------------------------------- 1 | package me.chunyu.spike.wcl_snowfall_demo.views; 2 | 3 | import android.graphics.Canvas; 4 | import android.graphics.Paint; 5 | import android.graphics.Point; 6 | 7 | import me.chunyu.spike.wcl_snowfall_demo.RandomGenerator; 8 | 9 | /** 10 | * 雪花的类, 移动, 移出屏幕会重新设置位置. 11 | *

12 | * Created by wangchenlong on 16/1/24. 13 | */ 14 | public class SnowFlake { 15 | // 雪花的角度 16 | private static final float ANGE_RANGE = 0.1f; // 角度范围 17 | private static final float HALF_ANGLE_RANGE = ANGE_RANGE / 2f; // 一般的角度 18 | private static final float HALF_PI = (float) Math.PI / 2f; // 半PI 19 | private static final float ANGLE_SEED = 25f; // 角度随机种子 20 | private static final float ANGLE_DIVISOR = 10000f; // 角度的分母 21 | 22 | // 雪花的移动速度 23 | private static final float INCREMENT_LOWER = 2f; 24 | private static final float INCREMENT_UPPER = 4f; 25 | 26 | // 雪花的大小 27 | private static final float FLAKE_SIZE_LOWER = 7f; 28 | private static final float FLAKE_SIZE_UPPER = 20f; 29 | 30 | private final RandomGenerator mRandom; // 随机控制器 31 | private final Point mPosition; // 雪花位置 32 | private float mAngle; // 角度 33 | private final float mIncrement; // 雪花的速度 34 | private final float mFlakeSize; // 雪花的大小 35 | private final Paint mPaint; // 画笔 36 | 37 | private SnowFlake(RandomGenerator random, Point position, float angle, float increment, float flakeSize, Paint paint) { 38 | mRandom = random; 39 | mPosition = position; 40 | mIncrement = increment; 41 | mFlakeSize = flakeSize; 42 | mPaint = paint; 43 | mAngle = angle; 44 | } 45 | 46 | public static SnowFlake create(int width, int height, Paint paint) { 47 | RandomGenerator random = new RandomGenerator(); 48 | int x = random.getRandom(width); 49 | int y = random.getRandom(height); 50 | Point position = new Point(x, y); 51 | float angle = random.getRandom(ANGLE_SEED) / ANGLE_SEED * ANGE_RANGE + HALF_PI - HALF_ANGLE_RANGE; 52 | float increment = random.getRandom(INCREMENT_LOWER, INCREMENT_UPPER); 53 | float flakeSize = random.getRandom(FLAKE_SIZE_LOWER, FLAKE_SIZE_UPPER); 54 | return new SnowFlake(random, position, angle, increment, flakeSize, paint); 55 | } 56 | 57 | // 绘制雪花 58 | public void draw(Canvas canvas) { 59 | int width = canvas.getWidth(); 60 | int height = canvas.getHeight(); 61 | move(width, height); 62 | canvas.drawCircle(mPosition.x, mPosition.y, mFlakeSize, mPaint); 63 | } 64 | 65 | // 移动雪花 66 | private void move(int width, int height) { 67 | double x = mPosition.x + (mIncrement * Math.cos(mAngle)); 68 | double y = mPosition.y + (mIncrement * Math.sin(mAngle)); 69 | 70 | mAngle += mRandom.getRandom(-ANGLE_SEED, ANGLE_SEED) / ANGLE_DIVISOR; // 随机晃动 71 | 72 | mPosition.set((int) x, (int) y); 73 | 74 | // 移除屏幕, 重新开始 75 | if (!isInside(width, height)) { 76 | reset(width); 77 | } 78 | } 79 | 80 | // 判断是否在其中 81 | private boolean isInside(int width, int height) { 82 | int x = mPosition.x; 83 | int y = mPosition.y; 84 | return x >= -mFlakeSize - 1 && x + mFlakeSize <= width && y >= -mFlakeSize - 1 && y - mFlakeSize < height; 85 | } 86 | 87 | // 重置雪花 88 | private void reset(int width) { 89 | mPosition.x = mRandom.getRandom(width); 90 | mPosition.y = (int) (-mFlakeSize - 1); // 最上面 91 | mAngle = mRandom.getRandom(ANGLE_SEED) / ANGLE_SEED * ANGE_RANGE + HALF_PI - HALF_ANGLE_RANGE; 92 | } 93 | } 94 | -------------------------------------------------------------------------------- /app/src/main/java/me/chunyu/spike/wcl_snowfall_demo/views/SnowView.java: -------------------------------------------------------------------------------- 1 | package me.chunyu.spike.wcl_snowfall_demo.views; 2 | 3 | import android.annotation.TargetApi; 4 | import android.content.Context; 5 | import android.graphics.Canvas; 6 | import android.graphics.Color; 7 | import android.graphics.Paint; 8 | import android.util.AttributeSet; 9 | import android.view.View; 10 | 11 | /** 12 | * 雪花视图, DELAY时间重绘, 绘制NUM_SNOWFLAKES个雪花 13 | *

14 | * Created by wangchenlong on 16/1/24. 15 | */ 16 | public class SnowView extends View { 17 | 18 | private static final int NUM_SNOWFLAKES = 150; // 雪花数量 19 | private static final int DELAY = 5; // 延迟 20 | private SnowFlake[] mSnowFlakes; // 雪花 21 | 22 | public SnowView(Context context) { 23 | super(context); 24 | } 25 | 26 | public SnowView(Context context, AttributeSet attrs) { 27 | super(context, attrs); 28 | } 29 | 30 | public SnowView(Context context, AttributeSet attrs, int defStyleAttr) { 31 | super(context, attrs, defStyleAttr); 32 | } 33 | 34 | @TargetApi(21) 35 | public SnowView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 36 | super(context, attrs, defStyleAttr, defStyleRes); 37 | } 38 | 39 | @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { 40 | super.onSizeChanged(w, h, oldw, oldh); 41 | if (w != oldw || h != oldh) { 42 | initSnow(w, h); 43 | } 44 | } 45 | 46 | private void initSnow(int width, int height) { 47 | Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // 抗锯齿 48 | paint.setColor(Color.WHITE); // 白色雪花 49 | paint.setStyle(Paint.Style.FILL); // 填充; 50 | mSnowFlakes = new SnowFlake[NUM_SNOWFLAKES]; 51 | for (int i = 0; i < NUM_SNOWFLAKES; ++i) { 52 | mSnowFlakes[i] = SnowFlake.create(width, height, paint); 53 | } 54 | } 55 | 56 | @Override protected void onDraw(Canvas canvas) { 57 | super.onDraw(canvas); 58 | for (SnowFlake s : mSnowFlakes) { 59 | s.draw(canvas); 60 | } 61 | // 隔一段时间重绘一次, 动画效果 62 | getHandler().postDelayed(runnable, DELAY); 63 | } 64 | 65 | // 重绘线程 66 | private Runnable runnable = new Runnable() { 67 | @Override 68 | public void run() { 69 | invalidate(); 70 | } 71 | }; 72 | } 73 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/christmas.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SpikeKing/wcl-snowfall-demo/5f7af9c12883cd842b76bdaf94795a14863a6efa/app/src/main/res/drawable/christmas.png -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 10 | 11 | 17 | 18 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SpikeKing/wcl-snowfall-demo/5f7af9c12883cd842b76bdaf94795a14863a6efa/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SpikeKing/wcl-snowfall-demo/5f7af9c12883cd842b76bdaf94795a14863a6efa/app/src/main/res/mipmap-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SpikeKing/wcl-snowfall-demo/5f7af9c12883cd842b76bdaf94795a14863a6efa/app/src/main/res/mipmap-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SpikeKing/wcl-snowfall-demo/5f7af9c12883cd842b76bdaf94795a14863a6efa/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SpikeKing/wcl-snowfall-demo/5f7af9c12883cd842b76bdaf94795a14863a6efa/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/values-v21/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 6 | -------------------------------------------------------------------------------- /app/src/main/res/values-w820dp/dimens.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 64dp 6 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #303F9F 5 | #FF4081 6 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/dimens.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 16dp 4 | 16dp 5 | 6 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | wcl-snowfall-demo 3 | 4 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 |