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androidbuttonlistenerpreference

onClickListener in PreferenceActivity

I have this onClickListener in onCreate method of my PreferenceActivity, but it gives me error.

Here is the PrefereceActivity:

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);

        Button button = (Button) findViewById(R.id.button2);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
             // do something.
            } 
        });
}

it gives me this error:

unable to start activity componentinfo java.lang.nullpointerexception

any idea what am I doing wrong?

EDIT: My SettingsPreference opens Dialog that holds that "button2".

Solution

  • The Button is causing your NullPointerException because you haven't set a layout and therefore it is null. You shouldn't need to use buttons in a PreferenceActivity anyway.

    There's a perfectly good example of using PreferenceActivity over at the Android developer site: http://developer.android.com/reference/android/preference/PreferenceActivity.html