| /* |
| * 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.internal.telephony; |
| |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.Handler; |
| import android.telephony.Rlog; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * The class to describe settings observer |
| */ |
| public class SettingsObserver extends ContentObserver { |
| private final Map<Uri, Integer> mUriEventMap; |
| private final Context mContext; |
| private final Handler mHandler; |
| private static final String TAG = "SettingsObserver"; |
| |
| public SettingsObserver(Context context, Handler handler) { |
| super(null); |
| mUriEventMap = new HashMap<>(); |
| mContext = context; |
| mHandler = handler; |
| } |
| |
| /** |
| * Start observing a content. |
| * @param uri Content URI |
| * @param what The event to fire if the content changes |
| */ |
| public void observe(Uri uri, int what) { |
| mUriEventMap.put(uri, what); |
| final ContentResolver resolver = mContext.getContentResolver(); |
| resolver.registerContentObserver(uri, false, this); |
| } |
| |
| /** |
| * Stop observing a content. |
| */ |
| public void unobserve() { |
| final ContentResolver resolver = mContext.getContentResolver(); |
| resolver.unregisterContentObserver(this); |
| } |
| |
| @Override |
| public void onChange(boolean selfChange) { |
| Rlog.e(TAG, "Should never be reached."); |
| } |
| |
| @Override |
| public void onChange(boolean selfChange, Uri uri) { |
| final Integer what = mUriEventMap.get(uri); |
| if (what != null) { |
| mHandler.obtainMessage(what.intValue()).sendToTarget(); |
| } else { |
| Rlog.e(TAG, "No matching event to send for URI=" + uri); |
| } |
| } |
| } |