DrawImage SurfaceView 多层绘制透明图

package com.ador.draw; import java.io.InputStream; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.util.AttributeSet; import android.view.SurfaceHolder; import android.view.SurfaceView; public class CustomSurfaceView extends SurfaceView implements SurfaceHolder.Callback { SurfaceHolder holder; private Paint paint; private int[] imgs = new int[]{R.drawable.abc0,R.drawable.abc1,R.drawable.abc2,R.drawable.abc3}; boolean flag = false; public CustomSurfaceView(Context context) { super(context); holder = this.getHolder();//获取holder holder.addCallback(this); paint = new Paint(); } public CustomSurfaceView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); holder = this.getHolder();//获取holder holder.addCallback(this); paint = new Paint(); } public CustomSurfaceView(Context context, AttributeSet attrs) { super(context, attrs); holder = this.getHolder();//获取holder holder.addCallback(this); paint = new Paint(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { new Thread(new MyThread()).start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { } //内部类的内部类 class MyThread implements Runnable{ @Override public void run() { Bitmap bmp; Bitmap bmp1; int i = 0; while(true){ while(flag){ Canvas canvas = holder.lockCanvas(null);//获取画布 int imgId = imgs[i]; bmp = setAlpha(readBitmap(getResources(), imgId), 50); Matrix matrix=new Matrix(); canvas.drawBitmap(bmp, matrix, paint); holder.unlockCanvasAndPost(canvas);//解锁画布，提交画好的图像 Canvas canvas1 = holder.lockCanvas(null);//获取画布 int imgId1 = imgs[i]; bmp1 = setAlpha(readBitmap(getResources(), imgId1), 50); Matrix matrix1=new Matrix(); canvas.drawBitmap(bmp1, matrix1, paint); holder.unlockCanvasAndPost(canvas1);//解锁画布，提交画好的图像 i += 1; if(i == imgs.length){ i = 0; } try { new Thread().sleep(2000); if(bmp!=null) bmp.recycle(); if(bmp1!=null) bmp1.recycle(); } catch (InterruptedException e) { e.printStackTrace(); } } try { new Thread().sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } } public static Bitmap readBitmap(Resources r, int resId) { // BitmapFactory.Options opt = new BitmapFactory.Options(); // opt.inPreferredConfig = Bitmap.Config.RGB_565; // opt.inPurgeable = true; // opt.inInputShareable = true; InputStream is = r.openRawResource(resId); return BitmapFactory.decodeStream(is); } public static Bitmap setAlpha(Bitmap sourceImg, int number) { int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()]; sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 获得图片的ARGB值 number = number * 255 / 100; for (int i = 0; i < argb.length; i++) { argb[i] = (number << 24) | (argb[i] & 0x00FFFFFF);// 修改最高2位的值 } sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888); return sourceImg; } public boolean isFlag() { return flag; } public void setFlag(boolean flag) { this.flag = flag; } }