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/*
* Copyright (C) 2017 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.settings.notification;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Handler;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;
import com.android.internal.annotations.VisibleForTesting;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.settingslib.core.lifecycle.Lifecycle;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnPause;
import com.android.settingslib.core.lifecycle.events.OnResume;
public abstract class SettingPrefController extends AbstractPreferenceController
implements PreferenceControllerMixin, LifecycleObserver, OnResume, OnPause {
protected static final int DEFAULT_ON = 1;
private SettingsPreferenceFragment mParent;
protected SettingsObserver mSettingsObserver;
protected SettingPref mPreference;
public SettingPrefController(Context context, SettingsPreferenceFragment parent,
Lifecycle lifecycle) {
super(context);
mParent = parent;
if (lifecycle != null) {
lifecycle.addObserver(this);
}
}
@Override
public void displayPreference(PreferenceScreen screen) {
mPreference.init(mParent);
super.displayPreference(screen);
if (isAvailable()) {
mSettingsObserver = new SettingsObserver();
}
}
@Override
public String getPreferenceKey() {
return mPreference.getKey();
}
@Override
public boolean isAvailable() {
return mPreference.isApplicable(mContext);
}
@Override
public void updateState(Preference preference) {
mPreference.update(mContext);
}
@Override
public void onResume() {
if (mSettingsObserver != null) {
mSettingsObserver.register(true /* register */);
}
}
@Override
public void onPause() {
if (mSettingsObserver != null) {
mSettingsObserver.register(false /* register */);
}
}
@VisibleForTesting
final class SettingsObserver extends ContentObserver {
public SettingsObserver() {
super(new Handler());
}
public void register(boolean register) {
final ContentResolver cr = mContext.getContentResolver();
if (register) {
cr.registerContentObserver(mPreference.getUri(), false, this);
} else {
cr.unregisterContentObserver(this);
}
}
@Override
public void onChange(boolean selfChange, Uri uri) {
super.onChange(selfChange, uri);
if (mPreference.getUri().equals(uri)) {
mPreference.update(mContext);
}
}
}
}
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