目前，我正在开发一个类似于“待办任务清单”的应用程序。我已经成功地在应用程序中实现了NotificationService和SchedularService，并且我能够按时收到任务的提醒通知。
以下是我的查询：
- 如果我重启手机，这段代码会删除我的闹钟吗？如果是的话，如何解决？
- 我为任务添加了“优先级”功能。但是我想要的机制是，如果用户选择“高”优先级，那么他应该在任务时间之前三次接收通知，比如在30分钟前、15分钟前和设定的时间点。怎样实现这个功能呢？
- 当通知被触发时，我想让手机震动。怎样实现这个功能呢？
- 我想了解关于NotifyService.java中已弃用的方法和构造函数可以做些什么。这些在API级别11中已被弃用：
Notification notification = new Notification(icon, text, time);和notification.setLatestEventInfo(this, title, text, contentIntent);在developer.android.com上，他们建议使用Notification.Builder代替。那么怎样使我的应用程序兼容所有的API级别呢？
这是我用于调度闹钟的代码片段：
...
scheduleClient.setAlarmForNotification(c, tmp_task_id);
...
这是 ScheduleClient.java 类的代码：
public class ScheduleClient {
private ScheduleService mBoundService;
private Context mContext;
private boolean mIsBound;
public ScheduleClient(Context context)
{
mContext = context;
}
public void doBindService()
{
mContext.bindService(new Intent(mContext, ScheduleService.class), mConnection, Context.BIND_AUTO_CREATE);
mIsBound = true;
}
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
mBoundService = ((ScheduleService.ServiceBinder) service).getService();
}
public void onServiceDisconnected(ComponentName className) {
mBoundService = null;
}
};
public void setAlarmForNotification(Calendar c, int tmp_task_id){
mBoundService.setAlarm(c, tmp_task_id);
}
public void doUnbindService() {
if (mIsBound)
{
mContext.unbindService(mConnection);
mIsBound = false;
}
}
}
这是 ScheduleService.java 的代码:
public class ScheduleService extends Service {
int task_id;
public class ServiceBinder extends Binder {
ScheduleService getService() {
return ScheduleService.this;
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
private final IBinder mBinder = new ServiceBinder();
public void setAlarm(Calendar c, int tmp_task_id) {
new AlarmTask(this, c, tmp_task_id).run();
}
}
这里是AlarmTask.java的代码：
public class AlarmTask implements Runnable{
private final Calendar date;
private final AlarmManager am;
private final Context context;
int task_id;
public AlarmTask(Context context, Calendar date, int tmp_task_id) {
this.context = context;
this.am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
this.date = date;
task_id = tmp_task_id;
}
@Override
public void run() {
Intent intent = new Intent(context, NotifyService.class);
intent.putExtra(NotifyService.INTENT_NOTIFY, true);
intent.putExtra("task_id", task_id);
PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);
am.set(AlarmManager.RTC, date.getTimeInMillis(), pendingIntent);
}
}
这是NotifyService.java文件：
public class NotifyService extends Service {
public class ServiceBinder extends Binder
{
NotifyService getService()
{
return NotifyService.this;
}
}
int task_id;
private static final int NOTIFICATION = 123;
public static final String INTENT_NOTIFY = "com.todotaskmanager.service.INTENT_NOTIFY";
private NotificationManager mNM;
SQLiteDatabase database;
@Override
public void onCreate() {
mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String tmp_task_brief = null;
task_id = intent.getIntExtra("task_id", 0);
loadDatabase();
Cursor cursor = database.query("task_info", new String[]{"task_brief"}, "task_id=?", new String[]{task_id+""}, null, null, null);
while(cursor.moveToNext())
{
tmp_task_brief = cursor.getString(0);
}
cursor.close();
if(intent.getBooleanExtra(INTENT_NOTIFY, false))
showNotification(tmp_task_brief);
return START_NOT_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
private final IBinder mBinder = new ServiceBinder();
private void showNotification(String tmp_task_brief) {
CharSequence title = "To Do Task Notification!!";
int icon = R.drawable.e7ca62cff1c58b6709941e51825e738f;
CharSequence text = tmp_task_brief;
long time = System.currentTimeMillis();
Notification notification = new Notification(icon, text, time);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, TaskDetails.class), 0);
notification.setLatestEventInfo(this, title, text, contentIntent);
notification.flags |= Notification.FLAG_AUTO_CANCEL;
mNM.notify(NOTIFICATION, notification);
stopSelf();
}
void loadDatabase()
{
database = openOrCreateDatabase("ToDoDatabase.db",
SQLiteDatabase.OPEN_READWRITE, null);
}
}
BroadCastReceiver比较陌生。 - Chintan Soni