理解SurfaceFlinger在Android中的作用

时间:2024-07-05 14:55:12
package cn.juwatech.surfaceflingerdemo; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; public class SurfaceFlingerDemoActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new MySurfaceView(this)); } // 自定义SurfaceView class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback { private SurfaceHolder holder; private DrawThread drawThread; public MySurfaceView(Context context) { super(context); holder = getHolder(); holder.addCallback(this); drawThread = new DrawThread(holder, context); } @Override public void surfaceCreated(SurfaceHolder holder) { drawThread.setRunning(true); drawThread.start(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // 处理Surface尺寸的变化 } @Override public void surfaceDestroyed(SurfaceHolder holder) { boolean retry = true; drawThread.setRunning(false); while (retry) { try { drawThread.join(); retry = false; } catch (InterruptedException e) { // 处理线程中断异常 } } } } // 自定义绘图线程 class DrawThread extends Thread { private SurfaceHolder surfaceHolder; private Context context; private boolean isRunning; private Paint paint; public DrawThread(SurfaceHolder holder, Context context) { surfaceHolder = holder; this.context = context; isRunning = false; paint = new Paint(); paint.setColor(Color.RED); paint.setStyle(Paint.Style.FILL); } public void setRunning(boolean run) { isRunning = run; } @Override public void run() { Canvas canvas; while (isRunning) { canvas = null; try { canvas = surfaceHolder.lockCanvas(); synchronized (surfaceHolder) { // 在Canvas上绘制内容 canvas.drawColor(Color.WHITE); canvas.drawRect(100, 100, 300, 300, paint); } } finally { if (canvas != null) { surfaceHolder.unlockCanvasAndPost(canvas); } } } } } }