Android Drag And Drop Demo

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/main_note_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="20dip"
		android:layout_centerHorizontal="true"
		android:background="@color/note_bg"
		android:text="@string/note1"
		android:textSize="24sp"
		android:padding="10dip"  />
    
    <TextView
        android:id="@+id/main_note_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
		android:layout_below="@id/main_note_1"
        android:layout_marginTop="20dip"
		android:layout_centerHorizontal="true"
		android:background="@color/note_bg"
		android:text="@string/note2"
		android:textSize="24sp"
		android:padding="10dip"  />

    <ImageView
        android:id="@+id/main_trash"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
		android:layout_centerHorizontal="true"
		android:layout_marginBottom="20dip"
        android:src="@drawable/trash" />

</RelativeLayout>

DragAndDropActivity.java

package com.viyu.draganddropdemo;

import com.viyu.dradanddropdemo.R;

import android.app.Activity;
import android.content.ClipData;
import android.content.ClipDescription;
import android.os.Bundle;
import android.util.Log;
import android.view.DragEvent;
import android.view.View;
import android.view.View.DragShadowBuilder;
import android.view.View.OnDragListener;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

 

public class MainActivity extends Activity{
	private TextView mNote_1 = null;
	private TextView mNote_2 = null;
	
	private ImageView trashView = null;
	
   private static final String TAG_NOTE_1 = "Note_1";
   private static final String TAG_NOTE_2 = "Note_2";

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

      trashView = (ImageView)findViewById(R.id.main_trash);
      
      mNote_1 = (TextView)findViewById(R.id.main_note_1);
      mNote_1.setTag(TAG_NOTE_1);
      mNote_1.setOnLongClickListener(new View.OnLongClickListener() {
         @Override
         public boolean onLongClick(View v) {
            ClipData.Item item = new ClipData.Item((CharSequence)v.getTag());
            String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
            ClipData dragData = new ClipData(v.getTag().toString(), 
            mimeTypes, item);
            View.DragShadowBuilder myShadow = new DragShadowBuilder(mNote_1);
            v.startDrag(dragData, myShadow, null, 0);
            return true;
         }
      });
      
      mNote_2 = (TextView)findViewById(R.id.main_note_2);
      mNote_2.setTag(TAG_NOTE_2);
      mNote_2.setOnLongClickListener(new View.OnLongClickListener() {
         @Override
         public boolean onLongClick(View v) {
            ClipData.Item item = new ClipData.Item((CharSequence)v.getTag());
            String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
            ClipData dragData = new ClipData(v.getTag().toString(), mimeTypes, item);
            View.DragShadowBuilder myShadow = new DragShadowBuilder(mNote_2);
            v.startDrag(dragData, myShadow, null, 0);
            return true;
         }
      });

      trashView.setOnDragListener( new OnDragListener(){
         @Override
         public boolean onDrag(View v,  DragEvent event){
         switch(event.getAction())                   
         {
            case DragEvent.ACTION_DROP:
               Log.d("trash view", "ACTION_DROP event");
               ClipData data = event.getClipData();
               CharSequence noteName = data.getItemAt(0).getText();
               if(noteName.equals(TAG_NOTE_1)) {
            	   mNote_1.setVisibility(View.GONE);
            	   Toast.makeText(MainActivity.this, "Note 1 has been removed.", Toast.LENGTH_SHORT).show();
               } else if(noteName.equals(TAG_NOTE_2)) {
            	   Toast.makeText(MainActivity.this, "Note 2 has been removed.", Toast.LENGTH_SHORT).show();
            	   mNote_2.setVisibility(View.GONE);
               }
               break;
            default: break;
            }
            return true;
         }
      });
   }
}