SubScreenFragment.java 文件源码

@Override
public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mSharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
        @Override
        public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) {
            final SubScreenFragment fragment = SubScreenFragment.this;
            final Context context = fragment.getActivity();
            if (context == null || fragment.getPreferenceScreen() == null) {
                final String tag = fragment.getClass().getSimpleName();
                // TODO: Introduce a static function to register this class and ensure that
                // onCreate must be called before "onSharedPreferenceChanged" is called.
                Log.w(tag, "onSharedPreferenceChanged called before activity starts.");
                return;
            }
            new BackupManager(context).dataChanged();
            fragment.onSharedPreferenceChanged(prefs, key);
        }
    };
    getSharedPreferences().registerOnSharedPreferenceChangeListener(
            mSharedPreferenceChangeListener);
}