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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settingslib.collapsingtoolbar;
import androidx.fragment.app.FragmentActivity;
import androidx.preference.PreferenceFragmentCompat;
import com.android.settingslib.utils.BuildCompatUtils;
import com.android.settingslib.widget.R;
import com.google.android.material.appbar.AppBarLayout;
/**
* A base fragment that supports multi-fragments in one activity. The activity likes to switch the
* different fragments which extend this base fragment and must use the following code to add the
* fragment to stack.
*
* protected void onCreate(Bundle savedState) {
* // omitted…
* getFragmentManager()
* .beginTransaction()
* .add(R.id.content_frame, new Your_Fragment())
* // Add root page to back-history
* .addToBackStack( null)
* .commit();
* // omitted
* }
*/
public abstract class BasePreferencesFragment extends PreferenceFragmentCompat {
/**
* Gets the title which the fragment likes to show on app bar. The child class must implement
* this
* function.
*
* @return The title of the fragment will show on app bar.
*/
public abstract CharSequence getTitle();
@Override
public void onResume() {
super.onResume();
FragmentActivity activity = getActivity();
if (activity != null) {
activity.setTitle(getTitle());
if (BuildCompatUtils.isAtLeastS()) {
AppBarLayout appBarLayout = (AppBarLayout) activity.findViewById(R.id.app_bar);
if (appBarLayout != null) {
appBarLayout.setExpanded(/* expanded= */ true);
}
}
}
}
}
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