利用SurfaceView实现墨迹天气雪花效果
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先看看效果图吧(小雪花的图片不是特别好,见谅)!
分析: 雪花太多, 用动画实现比较复杂, 可以借助SurfaceView控件, 为啥用SurfaceView呢, 它和View的区别: SurfeceView是在一个新启的单独的线程中绘制界面(双缓冲),不会阻碍UI线程, 而View必须在主线程即UI线程中更新界面,可能会导致UI线程的阻塞.SurfaceView在处理touch事件时会创建一个队列eventquene
什么时候用view,什么时候用SurfaceView? 如果是主动的更新界面, 需要一个单独的线程重绘状态,避免UI线程阻塞,这时用View就不方便了, 可以使用SurfaceView.
废话不多说,直接上代码:
import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.RectF;import android.util.AttributeSet;import android.util.Log;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.ViewGroup;import com.zchz.app.test.Snow;import java.util.ArrayList;import java.util.Random;/** * 作者：Dch on 2017/3/31 10:41 * 描述：仿墨迹天气雪花效果 */public class SnowingSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Runnable { private int snow_count = 5; Bitmap bitmap_snows[] = new Bitmap[5];//雪花图片 Bitmap bitmap_bg;//雪地背景 Thread thread; private boolean isRunning = true;//图片是否在移动 private float screenWidth; private float screenHeight; private static Random random = new Random(); private ArrayList<Snow> snowArrayList1 = new ArrayList<>(); private ArrayList<Snow> snowArrayList2 = new ArrayList<>(); private ArrayList<Snow> snowArrayList3 = new ArrayList<>(); private ArrayList<Snow> snowArrayList4 = new ArrayList<>(); private ArrayList<Snow> snowArrayList5 = new ArrayList<>(); private SurfaceHolder holder; public SnowingSurfaceView(Context context) { super(context); this.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); holder = getHolder(); holder.addCallback(this); //设置顶层绘制surfaceview透明 holder.setFormat(PixelFormat.RGBA_8888); initViewSize(context); initSnowImage(); addRandowSnow(); } /** * 初始化雪花,加载到集合中 */ private void addRandowSnow() { for (int i = 0; i < snow_count; i++) { snowArrayList1.add(new Snow(bitmap_snows[0], random.nextFloat() * screenWidth, random.nextFloat() * screenHeight, 8f, 1 - random.nextFloat() * 2 )); snowArrayList2.add(new Snow(bitmap_snows[1], random.nextFloat() * screenWidth, random.nextFloat() * screenHeight, 6f, 1 - random.nextFloat() * 2 )); snowArrayList3.add(new Snow(bitmap_snows[2], random.nextFloat() * screenWidth, random.nextFloat() * screenHeight, 4f, 1 - random.nextFloat() * 2 )); snowArrayList4.add(new Snow(bitmap_snows[3], random.nextFloat() * screenWidth, random.nextFloat() * screenHeight, 3f, 1 - random.nextFloat() * 2 )); snowArrayList5.add(new Snow(bitmap_snows[4], random.nextFloat() * screenWidth, random.nextFloat() * screenHeight, 2f, 1 - random.nextFloat() * 2 )); } } /** * 加载雪花图片到内存中 */ private void initSnowImage() { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 8; /*图片长宽方向缩小倍数*/ bitmap_snows[0] = BitmapFactory.decodeResource(getResources(), R.drawable.snow,options); bitmap_snows[1] = BitmapFactory.decodeResource(getResources(), R.drawable.snow2,options); bitmap_snows[2] = BitmapFactory.decodeResource(getResources(), R.drawable.snow,options); bitmap_snows[3] = BitmapFactory.decodeResource(getResources(), R.drawable.snow2,options); bitmap_snows[4] = BitmapFactory.decodeResource(getResources(), R.drawable.snow,options); bitmap_bg = BitmapFactory.decodeResource(getResources(), R.drawable.snow_bg); } private void initViewSize(Context context) { this.screenWidth = context.getResources().getDisplayMetrics().widthPixels; this.screenHeight = context.getResources().getDisplayMetrics().heightPixels; Log.e("屏幕宽高", screenWidth + "--" + screenHeight); } public SnowingSurfaceView(Context context, AttributeSet attrs) { super(context, attrs); } @Override public void run() { while (isRunning) { Canvas canvas = null; try { //第一步 锁定画布 canvas = holder.lockCanvas(); if (canvas != null) { //画雪花 drawSnow(canvas); Snow snow = null; for (int i = 0;i<snow_count;i++){ snow = snowArrayList1.get(i); snowDrop(snow); } for (int i = 0;i<snow_count;i++){ snow = snowArrayList2.get(i); snowDrop(snow); } for (int i = 0;i<snow_count;i++){ snow = snowArrayList3.get(i); snowDrop(snow); } for (int i = 0;i<snow_count;i++){ snow = snowArrayList4.get(i); snowDrop(snow); } for (int i = 0;i<snow_count;i++){ snow = snowArrayList5.get(i); snowDrop(snow); } } Thread.sleep(20); } catch (Exception e) { } finally { if (canvas != null) { holder.unlockCanvasAndPost(canvas); } } } } private void snowDrop(Snow snow) { if (snow.x > screenWidth || snow.x < 0 || snow.y > screenHeight){ snow.x = random.nextFloat()*screenWidth; snow.y = 0; } snow.x += snow.offSet; // 下落水平偏移量 snow.y += snow.speed; } private void drawSnow(Canvas canvas) { Paint paint = new Paint(); paint.setAntiAlias(true); //行锯齿 paint.setFilterBitmap(true);//防止画布抖动 RectF rectF = new RectF(0, 0, screenWidth, screenHeight); canvas.drawBitmap(bitmap_bg, null, rectF, paint); Snow snow = null; for (int i = 0; i < snow_count; i++) { snow = snowArrayList1.get(i); canvas.drawBitmap(snow.bitmap, snow.x, snow.y, paint); snow = snowArrayList2.get(i); canvas.drawBitmap(snow.bitmap, snow.x, snow.y, paint); snow = snowArrayList3.get(i); canvas.drawBitmap(snow.bitmap, snow.x, snow.y, paint); snow = snowArrayList4.get(i); canvas.drawBitmap(snow.bitmap, snow.x, snow.y, paint); snow = snowArrayList5.get(i); canvas.drawBitmap(snow.bitmap, snow.x, snow.y, paint); } } @Override public void surfaceCreated(SurfaceHolder holder) { thread = new Thread(this); thread.start(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { isRunning = false; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK){ isRunning = true; } return super.onKeyDown(keyCode, event); }}Activtity中:
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); UIUtils.setStatusbarTrans(this); SnowingSurfaceView snowingSurfaceView = new SnowingSurfaceView(this); setContentView(snowingSurfaceView);}
Snow.java/** * 作者：Dch on 2017/3/31 10:56 * 描述： * 邮箱： */public class Snow { /** * 雪花图片 */ public Bitmap bitmap; /** * 雪花开始飘落的横坐标 */ public float x; /** * 雪花开始飘落的纵坐标 */ public float y; /** * 雪花下落的速度 */ public float speed; /** * 雪花飘落的偏移值 */ public float offSet; public Snow(Bitmap bitmap, float x, float y, float speed, float offSet) { this.bitmap = bitmap; this.x = x; this.y = y; this.speed = speed; this.offSet = offSet; } public Snow() { }}
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