Hi All: I have tried this sample, it works great. But when I change lockCanvas(null) into lockCanvas(new Rect(x, y, x+20, y+20)), the example starts to flicker. It seems 'lockCanvas(Rect)' can not work well for TextureView or any other reasons?
I am using Motorola XOOM with android 4.0.3. Thanks for any help! 在 2012年10月4日星期四UTC+8上午6时06分00秒，Romain Guy (Google)写道： > > Here is a fully working example of Canvas & TextureView: > > http://pastebin.com/J4uDgrZ8 > > On Wed, Oct 3, 2012 at 3:01 PM, Romain Guy <[email protected]<javascript:>> > wrote: > > The problem is that you are calling updateTexImage() yourself. Do > > *not* do this. You are interfering with TextureView, preventing it > > from receiving the events that it uses to refresh the screen. > > > > On Tue, Oct 2, 2012 at 7:40 AM, Conrad Chapman > > <[email protected]<javascript:>> > wrote: > >> Also asked in StackOverflow here > >> > http://stackoverflow.com/questions/12688409/android-textureview-canvas-drawing-problems > > >> > >> I have an app that used SurfaceView to draw dynamic 2D graphs. It > worked ok > >> but transormations etc as we know are not supported. So I went to > >> TextureView. My old code used another class/thread to do the drawing > via the > >> Surfaceholder.lockCanvas(); So I changed this to > TextureView.lockcanvas. > >> When this runs the canvas is not accelerated (the view is). It does not > >> display initially but if I touch the screen it displays??? The touch is > >> handled by the main activity. > >> > >> Obviously it works as it will display eventually but why doesn't it > display > >> immediately? > >> > >> The TextureView class implements SurfaceTextureListener as such below. > >> @Override > >> public void onSurfaceTextureAvailable(SurfaceTexture surface, int > width, > >> int height) { > >> // TODO Auto-generated method stub > >> isRunning = true; > >> mySurface = surface; > >> mChart.setTextureSurface(surface); > >> mChart.setSurfaceSize(width, height); > >> mPaint.setColor(ZOOM_BUTTONS_COLOR); > >> //mySurface.setOnFrameAvailableListener(frameready); > >> mChart.Redraw(true); > >> } > >> @Override > >> public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) { > >> // TODO Auto-generated method stub > >> isRunning = false; > >> return false; > >> } > >> this block below also workswhen manipluating the view later on (pan and > >> zoom) > >> public void Render(Bitmap buffmap){ > >> //mCanvas = null; > >> post(new Runnable() { > >> public void run() { > >> invalidate(); > >> mySurface.updateTexImage(); > >> } > >> }); > >> > >> > >> The drawing from the worker thread/class is > >> protected void RenderCanvas(){ > >> //mCanvas = null; > >> Canvas c = null; > >> //synchronized (mCanvas) { > >> //mCanvas = null; > >> try { > >> c = mChartView.lockCanvas(null); > >> > >> synchronized (mCanvas) { > >> c.drawBitmap(buffBitmap, 0, 0, null); > >> > >> } > >> } finally { > >> if (c != null) { > >> mChartView.unlockCanvasAndPost(c); > >> } > >> } > >> mChartView.Render(null); > >> } > >> > >> Can I work like this? Non-GL content in a TextureView? > >> Please help desperate for an answer. > >> > >> -- > >> You received this message because you are subscribed to the Google > >> Groups "Android Developers" group. > >> To post to this group, send email to > >> [email protected]<javascript:> > >> To unsubscribe from this group, send email to > >> [email protected] <javascript:> > >> For more options, visit this group at > >> http://groups.google.com/group/android-developers?hl=en > > > > > > > > -- > > Romain Guy > > Android framework engineer > > [email protected] <javascript:> > > > > -- > Romain Guy > Android framework engineer > [email protected] <javascript:> > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
