Get coordinates of ActionEvent

Question

I got a little problem. In the following sample the first TextView has to show the type of MotionEvent-it works fine. The second TextView has to show the coordinates of the MotionEvent-but it doesn't work. I don't know why but maybe its only a small error ? Does anyone has an idea? Thanks for your help! Here is the Code:

package de.androidnewcomer.motionevent;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;

import static android.R.attr.x;
import static android.R.attr.y;

public class MainActivity extends AppCompatActivity implements View.OnTouchListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    FrameLayout Spielbereich=(FrameLayout)findViewById(R.id.Spielbereich);
    Spielbereich.setOnTouchListener(this);
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    TextView textView1=(TextView)findViewById(R.id.textView1);
    TextView textView2=(TextView)findViewById(R.id.textView2);
    TextView textView3=(TextView)findViewById(R.id.textView3);
    TextView textView4=(TextView)findViewById(R.id.textView4);
    int x1,x2,y1,y2;
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            x1 = (int)event.getX();
            y1 = (int)event.getY();
            textView1.setText("Action Down");
            textView2.setText(x1,y1);
            return true;
        }
        case MotionEvent.ACTION_UP: {
            x2 = (int)event.getX();
            y2 = (int)event.getY();
            textView3.setText("Action Up");
            textView4.setText(x2,y2);
            return true;
        }
    } return false;
}
}

score 1 · Accepted Answer · answered Apr 04 '17 at 05:26

1

I think u are using setText(...) wrong. In the docs you can See that TextView has the following setText methods:

final void setText(int resid) Sets the text to be displayed using a string resource identifier.
final void setText(CharSequence text) Sets the text to be displayed.
void setText(CharSequence text, TextView.BufferType type) Sets the text to be displayed and the TextView.BufferType.
final void setText(int resid, TextView.BufferType type) Sets the text to be displayed using a string resource identifier and the TextView.BufferType.
final void setText(char[] text, int start, int len) Sets the TextView to display the specified slice of the specified char array.

You are trying to use a setText(int,int) which is not supported. You should do something like textView2.setText(x1+" "+y1);

answered Apr 04 '17 at 05:26

Jérôme

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Thanks for this fast answer. I will try it like this. But I also try ... textView.setText(x1); and it also doesnt work... – rcode Apr 04 '17 at 06:07
`text.setText(x1)` will set the text to be displayed using a **string resource identifier.** So it will not work as you expect. – Jérôme Apr 04 '17 at 06:36
I try textView.setText(x1+" "+y1). It was the only error - now it works fine. Thank you very mouch! – rcode Apr 04 '17 at 14:01

Get coordinates of ActionEvent

1 Answers1