我正在实现一个SurfaceView子类,在其中运行一个单独的线程来绘制到SurfaceHolders Canvas上。
我在调用lockCanvas()
之前和之后测量时间,结果从约70毫秒到100毫秒不等。
有人能指出为什么会出现如此高的计时吗?
以下是相关代码:
public class TestView extends SurfaceView implements SurfaceHolder.Callback {
....
boolean created;
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
mThread = new DrawingThread(mHolder, true);
mThread.onWindowResize(width, height);
mThread.start();
}
public void surfaceCreated(SurfaceHolder holder) {
created = true;
}
public void surfaceDestroyed(SurfaceHolder holder) {
created = false;
}
class DrawingThread extends Thread {
public void run() {
while(created) {
Canvas canvas = null;
try {
long t0 = System.currentTimeMillis();
canvas = holder.lockCanvas(null);
long t1 = System.currentTimeMillis();
Log.i(TAG, "Timing: " + ( t1 - t0) );
} finally {
holder.unlockCanvasAndPost(canvas);
}
}