Cách bắt toạ độ khi Touch vào màn hình trên android

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    RelativeLayout mh;
    // Can nho: setOnTouchListenner, evet.getX, event.getY    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mh = (RelativeLayout) findViewById(R.id.ManHinh);
        mh.setOnTouchListener(new View.OnTouchListener() {
            @Override            public boolean onTouch(View v, MotionEvent event) {
                float x= event.getX();
                float y = event.getY();
                Toast.makeText(MainActivity.this, "x: "+x+"y: "+y,Toast.LENGTH_LONG).show();

                return false;
            }
        });
    }