一切正常,当我开始我的应用程序。但是当我进入下一个活动并返回SurfaceView时,它看起来像black
。当我调试时,我可以看到需要在画布上绘制的线条,但没有显示出来。
这里是我的代码:恢复到SurfaceView显示黑屏
public class DrawView extends SurfaceView implements Runnable
{
Thread thread = null;
SurfaceHolder holder;
Bitmap background;
Canvas canvas;
Matrix matrixUP = new Matrix();
Matrix matrixDOWN = new Matrix();
boolean ok = false;
public DrawView(Context context)
{
super(context);
holder = getHolder();
}
public void run()
{
while(ok)
{
if(!holder.getSurface().isValid())
{
continue;
}
watch_hand = Bitmap.createScaledBitmap(watch_hand, width/4, height/6, false);
watch_hand_down = Bitmap.createScaledBitmap(watch_hand_down, width/4, height/6, false);
background = BitmapFactory.decodeResource(getResources(), R.drawable.needles);
background = Bitmap.createScaledBitmap(background, width, height/2+20, false);
canvas = holder.lockCanvas();
matrixUP.setTranslate(CENTER_X - watch_hand.getWidth()/2, height/4 - watch_hand.getHeight() - 40);
matrixUP.preRotate((float) degreUP , watch_hand.getWidth()/2 , watch_hand.getHeight()-10);
matrixDOWN.setTranslate(CENTER_X - watch_hand_down.getWidth()/2, height/2 - watch_hand_down.getHeight() - 20);
matrixDOWN.preRotate((float) degreDOWN , watch_hand_down.getWidth()/2 , 10);
canvas.drawARGB(255, 255, 255, 255);
canvas.drawBitmap(background, 0, 0, null);
canvas.drawBitmap(watch_hand, matrixUP, null);
canvas.drawBitmap(watch_hand_down, matrixDOWN, null);
holder.unlockCanvasAndPost(canvas);
}
}
public void pause()
{
ok = false;
while(true)
{
try
{
thread.join();
}catch (InterruptedException e)
{
e.printStackTrace();
}
break;
}
thread = null;
}
public void resume()
{
ok = true;
thread = new Thread(this);
thread.start();
}
}
当你看到我使用的是恢复和暂停功能。他们从onCreate被调用。 为什么会发生这种情况,我该如何解决这个问题?
谢谢!
同样的事情发生在我的情况下,你可以分享的解决方案。 – 2013-03-23 13:33:10