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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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* 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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*/
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public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
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private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
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public interface OnCompleteListener {
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void onComplete();
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}
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private Context mContext;
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private NotificationManager mNotifiManager;
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private GTaskManager mTaskManager;
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private OnCompleteListener mOnCompleteListener;
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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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public void cancelSync() {
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mTaskManager.cancelSync();
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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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}
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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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}
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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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}
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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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}
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}
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}
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