How do I detect touch input on the Android

Question

Right now all I am trying to do is detect when the screen is pressed and then display a log message to confirm it happened. My code so far is modified off of the CameraPrevi

Answer 1

Here is a simple example on how to detect a simple on touch event, get coords and show a toast. The event in this exmple are Action Down, Move and Action up.

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.Toast;

public class MainActivity extends Activity {

    private boolean isTouch = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        int X = (int) event.getX();
        int Y = (int) event.getY();
        int eventaction = event.getAction();

        switch (eventaction) {
            case MotionEvent.ACTION_DOWN:
                Toast.makeText(this, "ACTION_DOWN AT COORDS "+"X: "+X+" Y: "+Y, Toast.LENGTH_SHORT).show();
                isTouch = true;
                break;

            case MotionEvent.ACTION_MOVE:
                Toast.makeText(this, "MOVE "+"X: "+X+" Y: "+Y, Toast.LENGTH_SHORT).show();
                break;

            case MotionEvent.ACTION_UP:
                Toast.makeText(this, "ACTION_UP "+"X: "+X+" Y: "+Y, Toast.LENGTH_SHORT).show();
                break;
        }
        return true;
    }
}