CODEWITHSUNDEEP
javaandroidxmlandroid-activityup-button
RedBassett
RedBassett

Reputation: 3587

Settings activity up button

I have a SettingsActivity that should have an up button linking back to MainActivity. The button appears, but doesn't do anything when clicked. The back button works fine.

AndroidManifest.xml:

<activity
        android:name=".SettingsActivity"
        android:label="@string/title_activity_settings"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.myapp.MainActivity" />
</activity>

I tried adding an action to onOptionsItemSelected for R.id.home with no luck. I also tried adding getActionBar().setDisplayHomeAsUpEnabled(true); to onCreate(), but it crashes the app with the following error:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapp/com.example.myapp.SettingsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)'

Upvotes: 4

Views: 689

Answers (1)

Will
Will

Reputation: 496

I suppose your code base was generated by Android Studio because I met the same problem. You can add the following code into your SettingsActivity.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == android.R.id.home) {
        finish(); // or go to another activity
        return true;
    }
    return super.onOptionsItemSelected(item);
}

This will make sure the up button works.

Upvotes: 5

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