How to drag and drop in ANDROID?

By | September 18, 2010

The following code helps you to do a drag and drop in ANDROID.

package com.pack;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.AbsoluteLayout;
import android.widget.Button;
import android.widget.ImageView;

public class Touch extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MyView tx = new MyView(this);
MyView2 tx2 = new MyView2(this);
tx.setText("Drag Me");
int imgID = getResources().getIdentifier("icon", "drawable", "com.pack");
tx2.setImageResource(imgID);
AbsoluteLayout l = new AbsoluteLayout(this);

AbsoluteLayout.LayoutParams p = new AbsoluteLayout.LayoutParams(
AbsoluteLayout.LayoutParams.WRAP_CONTENT,
AbsoluteLayout.LayoutParams.WRAP_CONTENT,0,0);
l.addView(tx,p);
l.addView(tx2,p);
setContentView(l);

}

// events when touching the screen

public boolean onTouchEvent(MotionEvent event) {

int eventaction = event.getAction();
int X = (int)event.getX();
int Y = (int)event.getY();
System.out.println("SCR X="+X+" SCR y="+Y);
switch (eventaction ) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
break;
}
return true;
}

/******************* Class 1 ************************************/
class MyView extends Button
{
public MyView(Context c){
super(c);
}

@Override
public boolean dispatchTouchEvent(MotionEvent event) {

int mCurX = (int)event.getRawX();
int mCurY = (int)event.getRawY();;
System.out.println("scrollx "+this.getScrollX());

int action = event.getAction();

if ( action == MotionEvent.ACTION_MOVE ) {

System.out.println("X="+mCurX+" y="+mCurY);
this.setText("x: " + mCurX + ",y: " + mCurY );
AbsoluteLayout.LayoutParams p = new AbsoluteLayout.LayoutParams(AbsoluteLayout.LayoutParams.WRAP_CONTENT,
AbsoluteLayout.LayoutParams.WRAP_CONTENT,mCurX-50,mCurY-50);
this.setLayoutParams (p);
}
return true;
}

public void draw(Canvas canvas) {
super.draw(canvas);
}

}

/******************* Class 2 ************************************/

class MyView2 extends ImageView
{
public MyView2(Context c){
super(c);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {

int mCurX = (int)event.getRawX();
int mCurY = (int)event.getRawY();;
System.out.println("scrollx "+this.getScrollX());

int action = event.getAction();

if ( action == MotionEvent.ACTION_MOVE ) {

System.out.println("X="+mCurX+" y="+mCurY);
int imgID = getResources().getIdentifier("icon", "drawable", "com.pack");
this.setImageResource(imgID);
AbsoluteLayout.LayoutParams p = new AbsoluteLayout.LayoutParams(AbsoluteLayout.LayoutParams.WRAP_CONTENT,
AbsoluteLayout.LayoutParams.WRAP_CONTENT,this.getScrollX()+ mCurX,this.getScrollY()+mCurY);
this.setLayoutParams (p);
}
return true;
}

@Override
public void draw(Canvas canvas) {
super.draw(canvas);

}
}
}

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