adding dynamic view using WindowManager.addView

Question

I have a code on ICS for tablets. I want to add a Imageview dynamicly to a fragment. The fragment already contains preferencelist. The code for adding the view dynamically is as follows. I am coding this drag and drop functionality. This part of the code is taken from TouchInterceptor.java file from android music app.

mWindowParams = new WindowManager.LayoutParams();
mWindowParams.gravity = Gravity.TOP ;
mWindowParams.x = 0;
mWindowParams.y = y
mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
    | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
    | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
    | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
mWindowParams.format = PixelFormat.TRANSLUCENT;
mWindowParams.windowAnimations = 0;

ImageView v = new ImageView(mContext);
int backGroundColor = mContext.getResources().getColor(R.color.bg_background);
v.setBackgroundColor(backGroundColor);
v.setImageBitmap(bm);

mWindowManager = (WindowManager)mContext.getSystemService("window");
mWindowManager.addView(v, mWindowParams);

I am specifying the x coordinate of windowlayout param as 0. Eventthen when the view is displayed , itstead of displaying from the leftside of the fragment(the right pane) ,the view is displayed from middle of the right pane and is spanning to the right pane . What I am doing wrong ? Whats has to be done to correct this ?

score 8 · Accepted Answer · edited Mar 10 '14 at 15:25

8

Try setting gravity to Gravity.TOP | Gravity.LEFT

edited Mar 10 '14 at 15:25

frogatto

28,539
11
83
129

answered May 17 '12 at 23:55

james

96
1
2

score 2 · Answer 2 · edited Apr 12 '17 at 11:49

I m working exatly on the same code taken from the old Google Music open souce project.

Like you I guess, I had a TouchInterceptor in a fragment. My problem was that the fragment does not take all the screen widht, it has an other fragment on its left.

I tried a lot using mWindowParams.gravity to be able to specify an absolute x,y but I couldn't find a solution. Eventually I solved it with mWindowParams.horizontalMargin.

Here is the code I came up with:

private int getAbsoluteLeft(){
    ViewGroup parent;
    View child = this;
    int left_absolute_position = 0;
    try{
        while( (parent = (ViewGroup) child.getParent()) != null) {
            left_absolute_position += child.getLeft();
            child = parent;
        }
    }catch(ClassCastException e){
    }

    return left_absolute_position;
}

private void startDragging(Bitmap bm, int x, int y) {
    stopDragging();
    //build the view
    Context context = getContext();
    ImageView v = new ImageView(context);
    //int backGroundColor = context.getResources().getColor(R.color.dragndrop_background);
    //v.setBackgroundColor(backGroundColor);
    //v.setBackgroundResource(R.drawable.playlist_tile_drag);
    v.setPadding(0, 0, 0, 0);
    v.setImageBitmap(bm);
    mDragBitmap = bm;

    mWindowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);

    //Build Params
    mWindowParams = new WindowManager.LayoutParams();
    mWindowParams.gravity = Gravity.TOP | Gravity.LEFT;
    mWindowParams.x = ( x - mDragPointX + mXOffset );
    mWindowParams.y = ( y - mDragPointY + mYOffset );

    DisplayMetrics metrics = new DisplayMetrics();
    mWindowManager.getDefaultDisplay().getMetrics(metrics);
    mWindowParams.horizontalMargin = (float)getAbsoluteLeft() / (float)metrics.widthPixels;

    mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
    mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
    mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
            | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
            | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
            | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
            | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS;
    mWindowParams.format = PixelFormat.TRANSLUCENT;
    mWindowParams.windowAnimations = 0;

    mWindowManager.addView(v, mWindowParams);
    mDragView = v;
}

The part I added is:

DisplayMetrics metrics = new DisplayMetrics();
mWindowManager.getDefaultDisplay().getMetrics(metrics);
mWindowParams.horizontalMargin = (float)getAbsoluteLeft() / (float)metrics.widthPixels;

This parameter mWindowParams.horizontalMargin specify the margin of the window from the specified gravity side (Gravity.Left) as a % € [0,1].

So with getAbsoluteLeft() I go up to the View tree to get the absolute distance of the list from the left side.

Dividing it by the window's width, you get percent of margin you need.

adding dynamic view using WindowManager.addView

2 Answers2

Linked