Convert the tap and drop live wallpaper commands coordinates to screen space.

src/com/android/launcher2/CellLayout.java

@@ -565,8 +565,11 @@ public class CellLayout extends ViewGroup {
                 if (lp.dropped) {
                     lp.dropped = false;
 
+                    final int[] cellXY = mCellXY;
+                    getLocationOnScreen(cellXY);
                     mWallpaperManager.sendWallpaperCommand(getWindowToken(), "android.home.drop",
-                            childLeft + lp.width / 2, childTop + lp.height / 2, 0, null);
+                            cellXY[0] + childLeft + lp.width / 2,
+                            cellXY[1] + childTop + lp.height / 2, 0, null);
                 }
             }
         }

src/com/android/launcher2/Workspace.java

@@ -637,12 +637,14 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
             case MotionEvent.ACTION_UP:
                 
                 if (mTouchState != TOUCH_STATE_SCROLLING) {
-                    
                     final CellLayout currentScreen = (CellLayout)getChildAt(mCurrentScreen);
                     if (!currentScreen.lastDownOnOccupiedCell()) {
+                        getLocationOnScreen(mTempCell);
                         // Send a tap to the wallpaper if the last down was on empty space
                         mWallpaperManager.sendWallpaperCommand(getWindowToken(), 
-                                "android.wallpaper.tap", (int) ev.getX(), (int) ev.getY(), 0, null);
+                                "android.wallpaper.tap",
+                                mTempCell[0] + (int) ev.getX(),
+                                mTempCell[1] + (int) ev.getY(), 0, null);
                     }
                 }