I'm developing a painting app, with canvas and SurfaceView, and I want to
record user operations, and generate video.
In this moment I'm trying:
public static Bitmap captureView(View v) {
Log.v(CAPTURE_TAG, "init");
v.setDrawingCacheEnabled(true);
v.buildDrawingCache(true);
Bitmap b = Bitmap.createBitmap(v.getDrawingCache());
//v.destroyDrawingCache();
v.setDrawingCacheEnabled(false); // clear drawing cache
Log.v(CAPTURE_TAG, "Fin:");
return b;
}
and I call this every 50ms, using timer, and AsynTask, on AsynkTask, on
onPostExecute method I save the bitmap in external storage:
public class takeCaptureTask extends AsyncTask<View, Void, Bitmap> {
@Override
protected void onPostExecute(Bitmap result) {
Log.v("taskCapt", "Fin - InitSave");
new saveCaptureTask().execute(result);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.v("taskCapt", "init");
}
@Override
protected Bitmap doInBackground(View... params) {
return Utils.captureView(params[0]);
}
}
And finally generate video using NDK and ffmpeg.
My problem is the performance, using this, every screenshot take 200ms
(5FPS), and I need at least 15 FPS.
My questions are:<br />
1- I'm in the correct way to do the screen recording without root? <br />
2- can I take screenshot of canvas using other methods?<br />
-> I found two methods, this, and save copy of canvas bitmap, but
two solutions have very poor performance
3- It's posible take screenshots from NDK without root? in this case,
how?<br />
4- It's faster save data to External Storage using NDK?<br />
5- How buffer a lot of images to process it later?
My appologies for my bad English.
Thanks a lot for your help!
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