Question

I just started learning how to program for android and cant seem to get the x positions for when someone clicks on the screen to appear in log cat. (im using an emulator if that has to do with anything) when i do click on the screen nothing happens. Here is my program on startup i get no errors. also using a relative layout

package com.practice;

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;


public class PracticeActivity extends Activity implements OnTouchListener{


    int touchX;
    int touchY;


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

    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {

        onTouchEvent(event);
        touchX = (int) event.getX();
        touchY = (int) event.getY(); 

        Log.d( "MOUSE", String.valueOf(touchX) );


        return true;
    }



}

Answer 1

Your OnTouchListener won’t get called until you register it with a view. For example:

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

    // Find a view in the layout
    View view = findViewById(android.id.content);

    // register the listener
    view.setOnTouchListener(this);
}