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From: Romain Guy <romain...@android.com>
Date: Wed, 3 Oct 2012 15:03:30 -0700
Message-ID: <CACtN5468K9_Cu_ArpngZnAD=nH1c3b1vsGqEuFaMj75Wu35...@mail.gmail.com>
Subject: Re: [android-developers] TextureView canvas drawing problems
To: Android Developers <android-developers@googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1

Here is a fully working example of Canvas & TextureView:

http://pastebin.com/J4uDgrZ8

On Wed, Oct 3, 2012 at 3:01 PM, Romain Guy <romain...@android.com> 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 <chapman.con...@gmail.com> 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.
>>
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>
>
>
> --
> Romain Guy
> Android framework engineer
> romain...@android.com



-- 
Romain Guy
Android framework engineer
romain...@android.com