ActionBarOnDestinationChangedListener.java
/*
* Copyright 2018 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 androidx.navigation.ui;
import android.graphics.drawable.Drawable;
import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
import androidx.annotation.StringRes;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
/**
* The OnDestinationChangedListener specifically for keeping the ActionBar updated.
* This handles both updating the title and updating the Up Indicator, transitioning between
* the drawer icon and up arrow as needed.
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY)
class ActionBarOnDestinationChangedListener extends
AbstractAppBarOnDestinationChangedListener {
private final AppCompatActivity mActivity;
ActionBarOnDestinationChangedListener(@NonNull AppCompatActivity activity,
@NonNull AppBarConfiguration configuration) {
super(activity.getDrawerToggleDelegate().getActionBarThemedContext(), configuration);
mActivity = activity;
}
@Override
protected void setTitle(CharSequence title) {
ActionBar actionBar = mActivity.getSupportActionBar();
actionBar.setTitle(title);
}
@Override
protected void setNavigationIcon(Drawable icon,
@StringRes int contentDescription) {
ActionBar actionBar = mActivity.getSupportActionBar();
if (icon == null) {
actionBar.setDisplayHomeAsUpEnabled(false);
} else {
actionBar.setDisplayHomeAsUpEnabled(true);
ActionBarDrawerToggle.Delegate delegate = mActivity.getDrawerToggleDelegate();
delegate.setActionBarUpIndicator(icon, contentDescription);
}
}
}