Move View Touch Listener Example

MoveViewTouchListener.java

import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * @author Simon Lightfoot <simon@demondevelopers.com>
 */
public class MoveViewTouchListener
	implements View.OnTouchListener
{
	private GestureDetector mGestureDetector;
	private View mView;


	public MoveViewTouchListener(View view)
	{
		mGestureDetector = new GestureDetector(view.getContext(), mGestureListener);
		mView = view;
	}

	@Override
	public boolean onTouch(View v, MotionEvent event)
	{
		return mGestureDetector.onTouchEvent(event);
	}

	private GestureDetector.OnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener()
	{
		private float mMotionDownX, mMotionDownY;

		@Override
		public boolean onDown(MotionEvent e)
		{
			mMotionDownX = e.getRawX() - mView.getTranslationX();
			mMotionDownY = e.getRawY() - mView.getTranslationY();
			return true;
		}

		@Override
		public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
		{
			mView.setTranslationX(e2.getRawX() - mMotionDownX);
			mView.setTranslationY(e2.getRawY() - mMotionDownY);
			return true;
		}
	};
}

TestActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;


public class TestActivity
	extends AppCompatActivity
{
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_test);

		final View testItem = findViewById(R.id.test_item);
		testItem.setOnTouchListener(new MoveViewTouchListener(testItem));
	}
}