Implement GestureDetector/OnGestureListener to detect Fling, and ObjectAnimator for ImageView

In this exercise, I will implement GestureDetector with OnGestureListener for a ImageView of icon. Once the user fling on the icon, it will be moved (animated using ObjectAnimator).

package com.example.androidanimatefling;

import android.os.Bundle;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.util.DisplayMetrics;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.OnGestureListener;
import android.view.View.OnTouchListener;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 TextView info;
 ImageView flingObj;
 FrameLayout mainScreen;

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

        info = (TextView)findViewById(R.id.info);
        flingObj = (ImageView)findViewById(R.id.flingobject);
        mainScreen = (FrameLayout)findViewById(R.id.mainscreen);
        
        final GestureDetector myGesture = new GestureDetector(this, new MyOnGestureListener());
        
        flingObj.setOnTouchListener(new OnTouchListener(){

   @Override
   public boolean onTouch(View v, MotionEvent event) {
    return myGesture.onTouchEvent(event);
   }});
        
        flingObj.setClickable(true);
        
    }

    class MyOnGestureListener implements OnGestureListener{
     
     int MIN_DIST = 100;

  @Override
  public boolean onDown(MotionEvent arg0) {
   // TODO Auto-generated method stub
   return false;
  }

  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    float velocityY) {
   float e1X = e1.getX();
   float e1Y = e1.getY();
   float e2X = e2.getX();
   float e2Y = e2.getY();
   float distX = e2X - e1X;
   float distY = e2Y - e1Y;
   
   info.setText(
     "e1X   e1Y : " + String.valueOf(e1X) + " : " + String.valueOf(e1Y) + "\n" +
     "e2X   e2Y : " + String.valueOf(e2X) + " : " + String.valueOf(e2Y) + "\n" +
     "velocityX : " + String.valueOf(velocityX) + "\n" +
     "velocityY : " + String.valueOf(velocityY));
   
   //Get the Y OFfset
   DisplayMetrics displayMetrics = new DisplayMetrics();
   getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
   int offsetY = displayMetrics.heightPixels - mainScreen.getMeasuredHeight();
   
   int[] location = new int[2];
   flingObj.getLocationOnScreen(location);
   float orgX = location[0];
   float orgY = location[1] - offsetY;
   
   float stopX = orgX + distX;
   float stopY = orgY + distY;
   
   if (distX > MIN_DIST) {
    //Fling Right
    ObjectAnimator flingAnimator = ObjectAnimator.ofFloat(flingObj, "translationX", orgX, stopX);
          flingAnimator.setDuration(1000);
          flingAnimator.start();
   }else if(distX < - MIN_DIST){
    //Fling Left
    ObjectAnimator flingAnimator = ObjectAnimator.ofFloat(flingObj, "translationX", orgX, stopX);
          flingAnimator.setDuration(1000);
          flingAnimator.start();
   }else if (distY > MIN_DIST) {
    //Fling Down
    ObjectAnimator flingAnimator = ObjectAnimator.ofFloat(flingObj, "translationY", orgY, stopY);
          flingAnimator.setDuration(1000);
          flingAnimator.start();
   }else if(distY < - MIN_DIST){
    //Fling Up
    ObjectAnimator flingAnimator = ObjectAnimator.ofFloat(flingObj, "translationY", orgY, stopY);
          flingAnimator.setDuration(1000);
          flingAnimator.start();
   }
   
   return true;
  }

  @Override
  public void onLongPress(MotionEvent e) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public boolean onScroll(MotionEvent e1, MotionEvent e2,
    float distanceX, float distanceY) {
   // TODO Auto-generated method stub
   return false;
  }

  @Override
  public void onShowPress(MotionEvent e) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public boolean onSingleTapUp(MotionEvent e) {
   // TODO Auto-generated method stub
   return false;
  }};

}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/mainscreen">
    
    <TextView 
        android:id="@+id/info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <ImageView
        android:id="@+id/flingobject"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="@dimen/padding_medium"
        android:src="@drawable/ic_launcher"
        tools:context=".MainActivity" />

</FrameLayout>

In order to use android.animation.ObjectAnimator, minSdkVersion="11" is needed.

Download the files.