gitProject/other/07_210340172杨馥银_代码标注/remote/GTaskASyncTask.java

/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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 net.micode.notes.gtask.remote;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;

import net.micode.notes.R;
import net.micode.notes.ui.NotesListActivity;
import net.micode.notes.ui.NotesPreferenceActivity;

//实现GTask的异步操作过程
public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {

    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;

    //通过interface实现多个接口，初始化异步的功能。
    public interface OnCompleteListener {
        void onComplete();
    }

    //文本内容
    private Context mContext;

    //实例化通知管理器
    private NotificationManager mNotifiManager;

    //实例化任务管理器
    private GTaskManager mTaskManager;

    //实例化监听器
    private OnCompleteListener mOnCompleteListener;

    //GTaskASyncTask类的构造函数
    public GTaskASyncTask(Context context, OnCompleteListener listener) {
        mContext = context;
        mOnCompleteListener = listener;
        mNotifiManager = (NotificationManager) mContext
                .getSystemService(Context.NOTIFICATION_SERVICE);
        mTaskManager = GTaskManager.getInstance();
    }

    //中断同步
    public void cancelSync() {
        mTaskManager.cancelSync();
    }

    //调用onProgressUpdate方法来更新进度条
    public void publishProgess(String message) {
        publishProgress(new String[] {
            message
        });
    }

    //向用户显示当前的同步状态
    private void showNotification(int tickerId, String content) {
        PendingIntent pendingIntent;
        // 如果同步失败，那么从系统取得一个用于启动一个NotesPreferenceActivity的PendingIntent对象
        if (tickerId != R.string.ticker_success) {
            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
                    NotesPreferenceActivity.class), 0);

        } else {
            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
                    NotesListActivity.class), 0);
        }


        Notification.Builder builder = new Notification.Builder(mContext)
                .setAutoCancel(true)
                .setContentTitle(mContext.getString(R.string.app_name))
                .setContentText(content)
                .setContentIntent(pendingIntent)
                .setWhen(System.currentTimeMillis())
                .setOngoing(true);
        Notification notification=builder.getNotification();
        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
    }

    @Override
    //异步执行后台线程将要完成的任务
    protected Integer doInBackground(Void... unused) {
        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
                .getSyncAccountName(mContext)));
        return mTaskManager.sync(mContext, this);
    }

    @Override
    //用于显示任务执行的进度
    protected void onProgressUpdate(String... progress) {
        showNotification(R.string.ticker_syncing, progress[0]);
        if (mContext instanceof GTaskSyncService) {
            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
        }
    }

    @Override
    //用于设置任务
    protected void onPostExecute(Integer result) {
        //若同步成功，则显示成功并展示出同步的账户与最新同步时间，若同步出现网络错误，则显示相应错误
        if (result == GTaskManager.STATE_SUCCESS) {
            showNotification(R.string.ticker_success, mContext.getString(
                    R.string.success_sync_account, mTaskManager.getSyncAccount()));
            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
        } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
        } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
        } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
            showNotification(R.string.ticker_cancel, mContext
                    .getString(R.string.error_sync_cancelled));
        }
        if (mOnCompleteListener != null) {
            new Thread(new Runnable() {

                //执行完后调用然后返回主线程中
                public void run() {
                    mOnCompleteListener.onComplete();
                }
            }).start();
        }
    }
}