¿Qué tal intentar GLSurfaceView:
http://developer.android.com/resources/articles/glsurfaceview.html
Dentro de Android SDK hay un ejemplo en conseguir superficie translúcida (app/TranslucentActivity.java), estableciendo esencialmente el canal alfa:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Create our Preview view and set it as the content of our
// Activity
mGLSurfaceView = new GLSurfaceView(this);
// We want an 8888 pixel format because that's required for
// a translucent window.
// And we want a depth buffer.
mGLSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
// Tell the cube renderer that we want to render a translucent version
// of the cube:
mGLSurfaceView.setRenderer(new CubeRenderer(true));
// Use a surface format with an Alpha channel:
mGLSurfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
setContentView(mGLSurfaceView);
}
para otros hilos sobre el uso de canal alfa se refieren a:
Alpha Channel Blur
How can I blur and dim an image to be used as an activity background?
blur a image at android
Otro ejemplo es la aplicación/TranslucentBlurActivity.java (de Android SDK):
public class TranslucentBlurActivity extends Activity {
/**
* Initialization of the Activity after it is first created. Must at least
* call {@link android.app.Activity#setContentView setContentView()} to
* describe what is to be displayed in the screen.
*/
@Override
protected void onCreate(Bundle icicle) {
// Be sure to call the super class.
super.onCreate(icicle);
// Have the system blur any windows behind this one.
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
// See assets/res/any/layout/translucent_background.xml for this
// view layout definition, which is being set here as
// the content of our screen.
setContentView(R.layout.translucent_background);
}
}
no estoy seguro, no intento de u poner esto en etiqueta en Manifiesto? android: theme = "@ android: style/Theme.Dialog" –