I have an app that used SurfaceView to draw dynamic 2D graphs. It worked ok
but transformations 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 not accelerated (the view
is) does not display initially but if I touch the
screen onSurfaceTextureUpdated (currently with no code inside) is called
and it displays???
protected void RenderCanvas(){
//mCanvas = null;
Canvas c = null;
//synchronized (mCanvas) {
//mCanvas = null;
try {
c = mChartView.lockCanvas(null);
if (!c.isHardwareAccelerated()) {
Log.w("GVIEW", "A TextureView or a subclass can only be "
+ "used with hardware acceleration enabled.");
}
synchronized (mCanvas) {
c.drawBitmap(buffBitmap, 0, 0, null);
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
mChartView.unlockCanvasAndPost(c);
//mSurfaceHolder.updateTexImage();
}
}
}
I implement the SurfaceTextureListener within my TextureView and all of the
program flow seems fine a real surface is handed to the plotting thread by
@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);
mChart.Redraw(true)
}
This void finishes with the RenderCanvas() above.
Redrawing the view also doesn't work unless i again touch the screen.
Cannot I not use TextureView like this?
Does it have to be openGl content stream?
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