Strange View.getHitRect() behaviour

Question

I have a simple layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="animate"
    android:text="animate" />

</LinearLayout>

and in my Activity I am printing hit rect of button after changing its ylocation:

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

public void animate(View view) {
    printHitRect();
    findViewById(R.id.button1).setY(50);
    printHitRect();
}
private void printHitRect() { 
    Rect rect = new Rect();
    findViewById(R.id.button1).getHitRect(rect);
    Log.d(">>button1 hit rect", rect.flattenToString()); 
} 
}

EXPECTED OUTPUT

button1 hit rect: 0 0 116 72

button1 hit rect: 0 50 116 122

ACTUAL OUTPUT

button1 hit rect: 0 0 116 72

button1 hit rect: -58 14 58 86

Can someone explain this output, am I doing something wrong or is it a bug? Basically I am using this getHitRect() in my custom ViewGroup to detect which child user has touched. Is there a better way to get the child at a particular point, may be a function like getChildAt(x, y)?

Instead of setY(), I have tried setTranslateY(). I also have used NineOldAndroid library as well as built in animation framework. Same behaviour can be seen if I use findViewById(R.id.button1).animate().y(50) instead of setY().

UPDATE:

I ended up writing utility method using nineoldandroid library that is working now:

private static void getHitRect(View v, Rect rect) {
    rect.left = (int) com.nineoldandroids.view.ViewHelper.getX(v);
    rect.top = (int) com.nineoldandroids.view.ViewHelper.getY(v);
    rect.right = rect.left + v.getWidth();
    rect.bottom = rect.top + v.getHeight();
}

Answer 1

getHitRect() had a bug and would not apply transforms properly. We fixed this bug internally and the fix will be made available in the next public release of Android.