Using buttons on android - newbie

Question

I am a newbie to android development, trying to get buttons working. every time i use this code below, the error message "unfortunately the app has stopped". but when i remove the code the app runs but obviously the buttons do nothing. here is the code ive tried

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

    Button button1 = (Button) findViewById(R.id.ExerciseButton);
    button1.setOnClickListener (new View.OnClickListener(){


        public void onClick(View v) {
        setContentView(R.layout.exercises);

}

});
}
}

anybody able to help me out there? thanks

by On click, are you trying to load another xml? Or migrate to another activity? — ngrashia, Aug 06 '14 at 10:04
Unfortunately, the app has stopped is not enough to identify the problem you need to post exception details displayed in Android Monitor > logcat (in android studio) — Palak, Mar 26 '16 at 06:29

score 1 · Answer 1 · answered Aug 06 '14 at 10:07

1

Don't try to load another View in the current activity. Navigate to a new ExercisesActivity.
Use:

public void onClick(View v) {
    Intent intent = new Intent(ExercisesActivity.this, WcActivity.class);
    startActivity(intent);
}

answered Aug 06 '14 at 10:07

userM1433372

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score 0 · Answer 2 · edited May 23 '17 at 11:45

0

You can't call setContentView anymore after the view has loaded (which it obviously has to receive button clicks). Use a different approach, like showing and hiding views or using a ViewFlipper (see Calling setContentView() multiple times), using fragments (see Fragments) or starting a new activity.

edited May 23 '17 at 11:45

Community

1
1

answered Aug 06 '14 at 10:07

0101100101

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score 0 · Answer 3 · answered Aug 06 '14 at 10:09

Well, from your code, I see a couple of things:

I am usually familiar to using the onClickListener of the Button class if I want to use it for a button. Makes sense, doesn't it?

buttonOne.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
        //Do stuff here
}

Second thing:

Start a new Activity (if that is what you want) by using an Intent:

Intent myIntent = new Intent(this, exercises.class);
startActivity(myIntent);

score 0 · Answer 4 · answered Aug 06 '14 at 11:10

You CAN absolutaly call setContentView on any event, even after the view has loaded I tried your code in a demo project and it is working fine. So, i think the error will be some where in your layout.(Let me know more if you need more help on this)

Using buttons on android - newbie

4 Answers4