Drag and drop image in android

Ever wonder how to drag and drop in android. Lets check how to drag and drop image in android.

MainActivity.java

package com.example.dragdrop;

import android.app.Activity;
import android.content.ClipData;
import android.content.ClipDescription;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.util.Log;
import android.view.DragEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.DragShadowBuilder;
import android.view.View.OnClickListener;
import android.view.View.OnDragListener;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.ImageView.ScaleType;
import android.widget.RelativeLayout;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity  {
 ImageView img_model, img_chain;
 private static final String IMAGEVIEW_TAG = "Android Logo";
 private android.widget.RelativeLayout.LayoutParams layoutParams;
 String msg;
 int windowwidth, windowheight;
 float x, y, dx, dy;
 Bitmap bMap;
 //SeekBar seek;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 
  img_chain = (ImageView) findViewById(R.id.img2);
  img_model = (ImageView) findViewById(R.id.img1);
  bMap = BitmapFactory
    .decodeResource(getResources(), R.drawable.chainsss);
 
  img_chain.setOnTouchListener(new OnTouchListener() {

   @Override
   public boolean onTouch(View v, MotionEvent event) {

    // TODO Auto-generated method stub
    layoutParams = (RelativeLayout.LayoutParams) img_chain
      .getLayoutParams();
    /*
     * switch(event.getActionMasked()) {
     */

    Matrix matrix = new Matrix();
    img_chain.setScaleType(ScaleType.MATRIX); // required
    matrix.postRotate((float) 30, 20, 50);

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN: {
     x = event.getX();// 2.3 not supported
     y = event.getY();// 2.3 not supported
     dx = x - img_chain.getX();// 2.3 not supported
     dy = y - img_chain.getY();// 2.3 not supported
    }

     return true;
    case MotionEvent.ACTION_MOVE: {
     img_chain.setX(event.getX() - dx);// 2.3 not supported
     img_chain.setY(event.getY() - dy);// 2.3 not supported

    }
     return true;
    case MotionEvent.ACTION_UP: {
     // your stuff
    }
     return true;
    }
    return false;

   }
  });
 }

}

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.dragdrop.MainActivity" >
 <ImageView
            android:id="@+id/img1"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:layout_gravity="center"
            android:src="@drawable/model" />
        <ImageView
            android:id="@+id/img2"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@drawable/chainsss"
            android:layout_gravity="center"
            android:layout_marginTop="60dp" /> 
</RelativeLayout>