android - 将图像添加到android中的表面 View

Question

我想将图像添加到 Surface View 。所以我使用了下面的代码

public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{

     Bitmap myicon;
     Canvas canvas;
     private Paint   mBitmapPaint;

     Paint p= new Paint();


       @Override
        protected void onDraw(Canvas canvas) {
           Bitmap myicon=BitmapFactory.decodeResource(getResources(),R.drawable.icon);
           canvas.drawColor(Color.BLACK);
           canvas.drawBitmap(myicon, 0,0, p);
           // canvas.drawBitmap(myicon, 0,0, null);
           // canvas.drawBitmap(myicon, 25,25, null);
       }
        public MySurfaceView(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
        }

        public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub

        }

        public void surfaceCreated(SurfaceHolder holder) {
            // TODO Auto-generated method stub

        }

        public void surfaceDestroyed(SurfaceHolder arg0) {
            // TODO Auto-generated method stub

        }
    }

但是它显示黑屏。我没有明白我在上面的代码中做错了什么。

请解决问题

提前致谢。

Answer 1

这是您的解决方案，伙计，另请查看我从中获得 solution 的链接

MainAct.java

public class MainAct extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mySurfaceView mySurfaceView = new mySurfaceView(getApplicationContext());
        setContentView(mySurfaceView);
    }
}

mySurfaceView.java

public class mySurfaceView extends SurfaceView implements
        SurfaceHolder.Callback {

    private TutorialThread _thread;

    public mySurfaceView(Context context) {
        super(context);
        getHolder().addCallback(this);
        _thread = new TutorialThread(getHolder(), this);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Bitmap _scratch = BitmapFactory.decodeResource(getResources(),
                R.drawable.icon);
        canvas.drawColor(Color.BLACK);
        canvas.drawBitmap(_scratch, 10, 10, null);

    }

    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
    }

    public void surfaceCreated(SurfaceHolder arg0) {
        _thread.setRunning(true);
        _thread.start();
    }

    public void surfaceDestroyed(SurfaceHolder arg0) {
        boolean retry = true;
        _thread.setRunning(false);
        while (retry) {
            try {
                _thread.join();
                retry = false;
            } catch (InterruptedException e) {
            }
        }
    }

    class TutorialThread extends Thread {
        private SurfaceHolder _surfaceHolder;
        private mySurfaceView _panel;
        private boolean _run = false;

        public TutorialThread(SurfaceHolder surfaceHolder, mySurfaceView panel) {
            _surfaceHolder = surfaceHolder;
            _panel = panel;
        }

        public void setRunning(boolean run) {
            _run = run;
        }

        @Override
        public void run() {
            Canvas c;
            while (_run) {
                c = null;
                try {
                    c = _surfaceHolder.lockCanvas(null);
                    synchronized (_surfaceHolder) {
                        _panel.onDraw(c);
                    }
                } finally {
                    if (c != null) {
                        _surfaceHolder.unlockCanvasAndPost(c);
                    }
                }
            }
        }
    }
}

编辑:

droidnova 网站不再可用。我找到了替代网站 here具有相同的来源。

希望对您有所帮助!!