Making Custom Android SurfaceView Transparent
Possible Duplicate:
how to make surfaceview transparent
I am trying to make a custom surface view semi translucent. Currently the activity is transparent so I can see the activity before it underneath, but as soon as I add my custom view that is 20dp * 20 dp (called ControlsOverlayView) it shows up as a black square on the screen. I have seen this post How to make a ListView transparent in Android? and have tried setting background color, cachehint and alpha of the view to no avail.
The transparent activity housing the view is ControlsOverlayActivity.java:
public class ControlsOverlayActivity extends Activity {
private ControlsOverlayView overlay;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
TextView textView = (TextView) findViewById(R.id.test_text);
try {
textView.setText("test");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
The test.xml layout including a sample TextView and my custom ControlsOverlayView is:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/test"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:id="@+id/test_text"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<wp.ui.ControlsOverlayView
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#00000000"
android:cacheColorHint="#00000000"
android:alpha="0"
/>
</FrameLayout>
and view:
public class ControlsOverlayView extends SurfaceView implements Runnable, Callback{
public ControlsOverlayView(Context context, AttributeSet attrs) {
super(context, attrs);
// make sure we get key events
setFocusable(true);
setFocusableInTouchMode(true);
requestFocus();
// register our interest in hearing about changes to our surface
getHolder().addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
//resize(getWidth(), getHeight());
//paintControls();
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
@Override
public void run() {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
also in my manifest i have:
<activity android:name=".ui.ControlsOverlayActivity" android:theme="@style/Theme.Transparent">
</activity>
and the Theme.Transparent is defined as:
<style name="Theme.Transparent" parent="android:Theme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>
Again it is just the custom view that can`t get to be transparent. Any ideas?
显然，因为你是从SurfaceView继承你不能获得透明度，请参阅StackOverflow答案制作SurfaceView透明
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