I am developing an application and I need drawingg to run in a different thread. Now my code is:
public class PainterView extends View implements DrawingListener { //private GestureDetector detector; private Context context; private Painter painter; private Bitmap background; private Bitmap bitmap; private Paint bitmapPaint; private Path path; private Paint paint; private float x; private float y; private boolean isErasing=false; private boolean isTextDrawing=false; private ExecutorService pool; public PainterView(Context context, Painter painter) { super(context); this.context = context; this.painter = painter; pool=Executors.newFixedThreadPool(3); //detector = new GestureDetector(context, new GestureListener()); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(final Canvas canvas) { if (bitmap != null) { pool.submit(new Runnable() { @Override public void run() { // TODO Auto-generated method stub synchronized (PainterView.this) { canvas.drawBitmap(background, 0, 0, bitmapPaint); canvas.drawBitmap(bitmap, 0, 0, bitmapPaint); canvas.drawPath(path, paint); } } }); } } @Override public boolean onTouchEvent(MotionEvent event) { //detector.onTouchEvent(event); x = event.getX(); y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: painter.touchStart(x, y); break; case MotionEvent.ACTION_MOVE: painter.touchMove(x, y); break; case MotionEvent.ACTION_UP: painter.touchUp(); break; } return true; } @Override public void onPictureUpdate(Bitmap background, Bitmap bitmap, Paint bitmapPaint, Path path, Paint paint) { this.background=background; this.bitmap = bitmap; this.bitmapPaint = bitmapPaint; this.path = path; this.paint = paint; invalidate(); } public void setPainter(Painter painter) { this.painter = painter; } }
I thought that if I use ExecutorService, then the application can draw in a different thread, but this will not work - when I draw the device’s blinking screen. So, tell me, how can I use multithreading for painting using SurfaceHolder and other elements? I need to make as few changes in my code as possible.
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