Drag and drop on Android

package com.example.android.myapplication; import android.app.Activity; import android.content.ClipData; import android.content.ClipDescription; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.util.Log; import android.view.DragEvent; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView; import android.widget.RelativeLayout; public class MainActivity extends Activity { ImageView img; String msg; private android.widget.RelativeLayout.LayoutParams layoutParams; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); img=(ImageView)findViewById(R.id.imageView); img.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 View.DragShadowBuilder(img); v.startDrag(dragData,myShadow,null,0); return true; } }); img.setOnDragListener(new View.OnDragListener() { @Override public boolean onDrag(View v, DragEvent event) { switch(event.getAction()) { case DragEvent.ACTION_DRAG_STARTED: layoutParams = (RelativeLayout.LayoutParams)v.getLayoutParams(); Log.d(msg, "Action is DragEvent.ACTION_DRAG_STARTED"); // Do nothing break; case DragEvent.ACTION_DRAG_ENTERED: Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENTERED"); int x_cord = (int) event.getX(); int y_cord = (int) event.getY(); break; case DragEvent.ACTION_DRAG_EXITED : Log.d(msg, "Action is DragEvent.ACTION_DRAG_EXITED"); x_cord = (int) event.getX(); y_cord = (int) event.getY(); layoutParams.leftMargin = x_cord; layoutParams.topMargin = y_cord; v.setLayoutParams(layoutParams); break; case DragEvent.ACTION_DRAG_LOCATION : Log.d(msg, "Action is DragEvent.ACTION_DRAG_LOCATION"); x_cord = (int) event.getX(); y_cord = (int) event.getY(); break; case DragEvent.ACTION_DRAG_ENDED : Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENDED"); // Do nothing break; case DragEvent.ACTION_DROP: Log.d(msg, "ACTION_DROP event"); // Do nothing break; default: break; } return true; } }); img.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { ClipData data = ClipData.newPlainText("", ""); View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(img); img.startDrag(data, shadowBuilder, img, 0); img.setVisibility(View.INVISIBLE); return true; } else { return false; } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }