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@ -1,11 +1,34 @@
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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.gtask.remote;
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/*异步操作类,实现GTask的异步操作过程
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/*
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* Service是在一段不定的时间运行在后台,不和用户交互的应用组件
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* 主要方法:
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* private void showNotification(int tickerId, String content) 向用户提示当前同步的状态,是一个用于交互的方法
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* protected Integer doInBackground(Void... unused) 此方法在后台线程执行,完成任务的主要工作,通常需要较长的时间
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* protected void onProgressUpdate(String... progress) 可以使用进度条增加用户体验度。 此方法在主线程执行,用于显示任务执行的进度。
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* protected void onPostExecute(Integer result) 相当于Handler 处理UI的方式,在这里面可以使用在doInBackground 得到的结果处理操作UI
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* private void startSync() 启动一个同步工作
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* private void cancelSync() 取消同步
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* public void onCreate()
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* public int onStartCommand(Intent intent, int flags, int startId) service生命周期的组成部分,相当于重启service(比如在被暂停之后),而不是创建一个新的service
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* public void onLowMemory() 在没有内存的情况下如果存在service则结束掉这的service
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* public IBinder onBind()
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* public void sendBroadcast(String msg) 发送同步的相关通知
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* public static void startSync(Activity activity)
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* public static void cancelSync(Context context)
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* public static boolean isSyncing() 判读是否在进行同步
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* public static String getProgressString() 获取当前进度的信息
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*/
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import android.app.Activity;
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import android.app.Service;
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@ -13,96 +36,109 @@ import android.content.Context;
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import android.content.Intent;
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import android.os.Bundle;
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import android.os.IBinder;
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public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
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public class GTaskSyncService extends Service {
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public final static String ACTION_STRING_NAME = "sync_action_type";
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public final static int ACTION_START_SYNC = 0;
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private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
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public final static int ACTION_CANCEL_SYNC = 1;
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public interface OnCompleteListener {
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void onComplete();
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}
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public final static int ACTION_INVALID = 2;
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private Context mContext;
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public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";
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private NotificationManager mNotifiManager;
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public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";
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private GTaskManager mTaskManager;
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public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";
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private OnCompleteListener mOnCompleteListener;
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private static GTaskASyncTask mSyncTask = null;
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public GTaskASyncTask(Context context, OnCompleteListener listener) {
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mContext = context;
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mOnCompleteListener = listener;
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mNotifiManager = (NotificationManager) mContext
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.getSystemService(Context.NOTIFICATION_SERVICE);
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mTaskManager = GTaskManager.getInstance();
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}
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private static String mSyncProgress = "";
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public void cancelSync() {
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mTaskManager.cancelSync();
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//开始一个同步的工作
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private void startSync() {
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if (mSyncTask == null) {
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mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
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public void onComplete() {
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mSyncTask = null;
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sendBroadcast("");
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stopSelf();
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}
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});
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sendBroadcast("");
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mSyncTask.execute(); //这个函数让任务是以单线程队列方式或线程池队列方式运行
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}
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}
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public void publishProgess(String message) { // 发布进度单位,系统将会调用onProgressUpdate()方法更新这些值
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publishProgress(new String[] {
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message
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});
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}
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private void showNotification(int tickerId, String content) {
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Notification notification = new Notification(R.drawable.notification, mContext
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.getString(tickerId), System.currentTimeMillis());
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notification.defaults = Notification.DEFAULT_LIGHTS; // 调用系统自带灯光
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notification.flags = Notification.FLAG_AUTO_CANCEL; // 点击清除按钮或点击通知后会自动消失
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PendingIntent pendingIntent; //一个描述了想要启动一个Activity、Broadcast或是Service的意图
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if (tickerId != R.string.ticker_success) {
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pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
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NotesPreferenceActivity.class), 0); //如果同步不成功,那么从系统取得一个用于启动一个NotesPreferenceActivity的PendingIntent对象
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} else {
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pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
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NotesListActivity.class), 0); //如果同步成功,那么从系统取得一个用于启动一个NotesListActivity的PendingIntent对象
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private void cancelSync() {
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if (mSyncTask != null) {
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mSyncTask.cancelSync();
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}
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notification.setLatestEventInfo(mContext, mContext.getString(R.string.app_name), content,
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pendingIntent);
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mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);//通过NotificationManager对象的notify()方法来执行一个notification的消息
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}
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@Override
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protected Integer doInBackground(Void... unused) {
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publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
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.getSyncAccountName(mContext))); //利用getString,将把 NotesPreferenceActivity.getSyncAccountName(mContext))的字符串内容传进sync_progress_login中
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return mTaskManager.sync(mContext, this); //进行后台同步具体操作
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public void onCreate() { //初始化一个service
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mSyncTask = null;
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}
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@Override
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protected void onProgressUpdate(String... progress) {
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showNotification(R.string.ticker_syncing, progress[0]);
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if (mContext instanceof GTaskSyncService) { //instanceof 判断mContext是否是GTaskSyncService的实例
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((GTaskSyncService) mContext).sendBroadcast(progress[0]);
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public int onStartCommand(Intent intent, int flags, int startId) {
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Bundle bundle = intent.getExtras();
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if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
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switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
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//两种情况,开始同步或者取消同步
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case ACTION_START_SYNC:
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startSync();
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break;
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case ACTION_CANCEL_SYNC:
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cancelSync();
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break;
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default:
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break;
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}
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return START_STICKY; //等待新的intent来是这个service继续运行
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}
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return super.onStartCommand(intent, flags, startId);
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}
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@Override
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protected void onPostExecute(Integer result) { //用于在执行完后台任务后更新UI,显示结果
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if (result == GTaskManager.STATE_SUCCESS) {
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showNotification(R.string.ticker_success, mContext.getString(
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R.string.success_sync_account, mTaskManager.getSyncAccount()));
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NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis()); //设置最新同步的时间
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} else if (result == GTaskManager.STATE_NETWORK_ERROR) {
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showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
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} else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
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showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
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} else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
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showNotification(R.string.ticker_cancel, mContext
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.getString(R.string.error_sync_cancelled));
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} //几种不同情况下的结果显示
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if (mOnCompleteListener != null) {
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new Thread(new Runnable() { //这里好像是方法内的一个线程,但是并不太懂什么意思
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public void run() { //完成后的操作,使用onComplete()将所有值都重新初始化,相当于完成一次操作
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mOnCompleteListener.onComplete();
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}
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}).start();
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public void onLowMemory() {
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if (mSyncTask != null) {
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mSyncTask.cancelSync();
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}
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}
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}
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public IBinder onBind(Intent intent) { //不知道干吗用的
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return null;
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}
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public void sendBroadcast(String msg) {
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mSyncProgress = msg;
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Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME); //创建一个新的Intent
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intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null); //附加INTENT中的相应参数的值
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intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg);
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sendBroadcast(intent); //发送这个通知
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}
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public static void startSync(Activity activity) {//执行一个service,service的内容里的同步动作就是开始同步
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GTaskManager.getInstance().setActivityContext(activity);
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Intent intent = new Intent(activity, GTaskSyncService.class);
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intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC);
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activity.startService(intent);
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}
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public static void cancelSync(Context context) {//执行一个service,service的内容里的同步动作就是取消同步
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Intent intent = new Intent(context, GTaskSyncService.class);
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intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC);
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context.startService(intent);
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}
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public static boolean isSyncing() {
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return mSyncTask != null;
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}
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public static String getProgressString() {
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return mSyncProgress;
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}
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}
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