Hi all
I want to display an image, on custom class (BufferView) derived from the
SurfaceView class. The image is loaded from an intent which allows user to
select of of the pictures in the default Android's gallery.
Unfortunately, the view is occcluded by the gallery intent so lockCanvas()
returns null when the root Activity tries to render the RGBA buffer
retrieved from the image. (The image is fine---I can render the image to
the view by pressing a "display" button afterwards) I also tried to render
the image in "onResume" method yet it doesn't work.
The image is loaded from an intent of Android's default gallery, so I put
the render function in the onActivityResult() like this:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent
data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == 1 && data != null) {
Uri contentURI = Uri.parse(data.getDataString());
ContentResolver cr = getContentResolver();
InputStream in = null;
try {
in = cr.openInputStream(contentURI);
BitmapFactory.Options options = new
BitmapFactory.Options();
Bitmap galleryFile =
BitmapFactory.decodeStream(in,null,options);
imgHeight = galleryFile.getHeight();
imgWidth = galleryFile.getWidth();
img = new int[imgWidth * imgHeight];
galleryFile.getPixels(img, 0, imgWidth, 0, 0, imgWidth,
imgHeight);
bufferView.render(img, imgWidth, imgHeight);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
}
In bufferView.render(), it contains a typical routine of rendering a RGBA
buffer:
public void render(int buf[], int w, int h) {
if (buf != null) {
canvas = holder.lockCanvas();
if (canvas != null) {
canvas.drawBitmap(buf, 0, w, 0, 0, w, h, false, null);
holder.unlockCanvasAndPost(canvas);
}
}
}
I wonder if there is any method, better without creating a new thread, to
display the image in the view (i.e. the lockCanvas does not return null)?
Thanks very much,
TH
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