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POAndroid, manupulate camera preview frames
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copied!<p>I want to make an Android application that uses the camera and applies image processing filters on the preview frames. </p> <pre><code>package alex.filter; import java.io.IOException; import android.content.Context; import android.graphics.Canvas; import android.hardware.Camera; import android.hardware.Camera.PreviewCallback; import android.view.SurfaceHolder; import android.view.SurfaceView; class Preview extends SurfaceView implements SurfaceHolder.Callback { SurfaceHolder mHolder; public Camera camera; Preview(Context context) { super(context); mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { camera = Camera.open(); try { camera.setPreviewDisplay(holder); camera.setPreviewCallback(new PreviewCallback() { public void onPreviewFrame(byte[] data, Camera arg1) { for( int i = 0 ; i < data.length ; i ++ ){ data[ i] = 0; // or some sirius filter } Preview.this.invalidate(); } }); } catch (IOException e) { e.printStackTrace(); } } public void surfaceDestroyed(SurfaceHolder holder) { camera.stopPreview(); camera = null; } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { Camera.Parameters parameters = camera.getParameters(); parameters.setPreviewSize(w, h); camera.setParameters(parameters); camera.startPreview(); } @Override public void draw(Canvas canvas) { super.draw(canvas); } } </code></pre> <p>However, I see no changes in the emulator no matter what I do in the <code>onPreviewFrame</code> method.</p>

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