Question

I have searched the web for solution to my problem and can't seem to find anything that will work. I have implemented the following into my app and it does work. However, I would like to to add a toolbar at the top with the left arrow to allow the user to go back. can anyone help me out with this.

public class ActivitySettings extends PreferenceActivity {

     @Override
     public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
     }

     public static class MyPreferenceFragment extends PreferenceFragment {

          @Override
          public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          addPreferencesFromResource(R.xml.preferences);
          }
     }
}

Thanks for any and all help.

Answer 1

This is the exact use case of the Preferences Support Library - it allows you to not use PreferenceActivity and instead use a PreferenceFragmentCompat. This allows you to use AppCompatActivity and the Toolbar support built into it.

Answer 2

The PreferenceActivity doesn't extend the AppCompatActivity.

As solution you can use the PreferenceFragmentCompat with any Activity or AppCompatActivity

In this case you have to set preferenceTheme in your theme:

<style name="AppTheme" parent="@style/Theme.AppCompat.Light">
  ...
  <item name="preferenceTheme">@style/PreferenceThemeOverlay</item>
</style>

In this way you can customize the preferenceTheme to style the layouts used for each preference.

Moreover with the new 22.1+ appcompat you can use the AppCompatDelegate to extend AppCompat's support to any Activity.

You can check this official link to AppCompatPreferenceActivity, where you can find an example of this technique.

Toolbar in a settings activity/fragment

2 个答案: