I have mostly stolen some code for drag and drop in a list view from
the android music app, which is here:
http://www.netmite.com/android/mydroid/cupcake/packages/apps/Music/src/com/android/music/TouchInterceptor.java
Somehow with my implementation I can not get the transparency and
background color to work. It seems like the call to
v.setBackgroundColor(Color.LTGRAY); has no effect. Also in the sample
code from the music app the bitmap is partially transparent but on
mine it is a solid black background. I replaced:
int backGroundColor = mContext.getResources().getColor
(R.color.dragndrop_background);
v.setBackgroundColor(backGroundColor);
with
v.setBackgroundColor(Color.LTGRAY);
In the sample code they instantiate a TouchInterceptor as part of a
ListActivity, but in my case I just use a list view in a class that
has been extended from Activity.
I can load a different bitmap then the one passed to the function and
that works fine, but I still get a solid black background on the view.
I am suspecting that it may have to do with the line that gets the
windowManager:
windowManager = (WindowManager)context.getSystemService("window");
since in my case I am not using a ListActivity. But I am really
stumped, if anybody has any suggestions for what I could investigate
or do it would be appreciated.
This is my function:
private void startDragging(Bitmap bm, int y) {
windowParams = new WindowManager.LayoutParams();
windowParams.gravity = Gravity.TOP;
windowParams.x = 0;
windowParams.y = y - dragPoint + coordOffset;
windowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
windowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
windowParams.flags =
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
|
WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
|
WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
|
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
windowParams.format = PixelFormat.TRANSLUCENT;
windowParams.windowAnimations = 0;
ImageView v = new ImageView(context);
//Bitmap bm =
BitmapFactory.decodeResource(context.getResources(),
R.drawable.icon);
v.setBackgroundColor(Color.LTGRAY);
v.setImageBitmap(bm);
if (dragBitmap != null) {
dragBitmap.recycle();
}
dragBitmap = bm;
windowManager =
(WindowManager)context.getSystemService("window");
windowManager.addView(v, windowParams);
dragView = v;
}
}
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