MainActivity.java

package com.example.customview;

import com.example.custumview.R;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		final MyOwnView btn = (MyOwnView) findViewById(R.id.btn_hello);
		btn.setOnTouchListener(new OnTouchListener() {
			int[] temp = new int[] { 0, 0 };

			public boolean onTouch(View v, MotionEvent event) {

				int eventaction = event.getAction();
				Log.i("&&&", "onTouchEvent:" + eventaction);

				int x = (int) event.getRawX();
				int y = (int) event.getRawY();

				switch (eventaction) {
				case MotionEvent.ACTION_DOWN: // touch down so check if the
					temp[0] = (int) event.getX();
					temp[1] = y - v.getTop();
					break;

				case MotionEvent.ACTION_MOVE: // touch drag with the ball
					v.layout(x - temp[0], y - temp[1], x + v.getWidth()
							- temp[0], y - temp[1] + v.getHeight());
					v.postInvalidate(); // redraw
					break;
				case MotionEvent.ACTION_UP:
					break;
				}

				return false;
			}
		});
	}
}