Autostart和BroadcastReceiver

Question

我有一个在固定时间执行AlarmReceiver的类(在android启动后启动)。我添加了sharedpreferences来禁用和启用警报。如果我禁用并重新启用，则报警不会运行。我需要重启模拟器。我可以避免模拟器重启吗？谢谢!

public class AutoStart extends BroadcastReceiver {

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    CheckboxPreference = prefs.getBoolean("checkboxPref", true);
Calendar cal4 = Calendar.getInstance(TimeZone.getDefault(), Locale.getDefault());
    cal4.set(Calendar.DATE,31);
    cal4.set(Calendar.MONTH,Calendar.DECEMBER); 
    cal4.set(Calendar.YEAR,2012);//year...
    cal4.set(Calendar.HOUR_OF_DAY, 23);  
    cal4.set(Calendar.MINUTE, 59);       
    cal4.set(Calendar.SECOND, 00);       

Intent intent2 = new Intent(context, AlarmReceiver.class);
    PendingIntent Alarm1 = PendingIntent.getBroadcast(context, 0, intent2, 0);

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal4.getTimeInMillis(), DateUtils.DAY_IN_MILLIS, Alarm1);

清单：

<receiver android:name="AutoStart">
        <intent-filter>
        <action
        android:name="android.intent.action.BOOT_COMPLETED" />
        <category android:name="android.intent.category.HOME" />
        </intent-filter>
        </receiver>

Answer 1

您要做的第一件事是创建一个静态方法，使警报放在AutoStart中

public static modifyAlarm (Context context, boolean cancel)
{
  Calendar cal4 = Calendar.getInstance(TimeZone.getDefault(), Locale.getDefault());
  cal4.set(Calendar.DATE,31);
  cal4.set(Calendar.MONTH,Calendar.DECEMBER); 
  cal4.set(Calendar.YEAR,2012);//year...
  cal4.set(Calendar.HOUR_OF_DAY, 23);  
  cal4.set(Calendar.MINUTE, 59);       
  cal4.set(Calendar.SECOND, 00);       

  Intent intent2 = new Intent(context, AlarmReceiver.class);
  PendingIntent Alarm1 = PendingIntent.getBroadcast(context, 0, intent2, 0);

  AlarmManager alarmManager = (AlarmManager) context.getSystemService (Context.ALARM_SERVICE);
  if (cancel)
    alarmManager.cancel (Alarm1);
  else
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal4.getTimeInMillis(), DateUtils.DAY_IN_MILLIS, Alarm1);
}

在AutoStart的onReceive()中这样调用它：

@Override
public void onReceive (Context context, Intent intent)
{
  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);     
  makeAlarm (context, prefs.getBoolean("checkboxPref", true));
}

现在，您的首选项必须是某个Activity的一部分。为了简单起见，我们将负责处理该活动的onPause()中的警报；

@Override
protected void onPause()
{
  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
  boolean alarmEnabled = prefs.getBoolean("checkboxPref", true);
  AutoStart.modifyAlarm (this, alarmEnabled);
  super.onPause();
}

现在，当用户取消或重新启用您的警报时，您的代码会处理此问题。如果您在PendingIntent上调用cancel，它将在有效时取消警报，如果无效则不执行任何操作，因此我们不必担心检查警报是否已经存在。

Answer 2

<receiver android:name=".AutoStart">
        <intent-filter>
           <action android:name="android.intent.action.BOOT_COMPLETED" />
           <category android:name="android.intent.category.HOME" />
        </intent-filter>
</receiver>

更新：

SharedPreferences yourPreferences = getSharedPreferences("prefName", MODE_PRIVATE);
if (!yourPreferences.getBoolean("prefName", false)) {
        Editor editor = yourPreferences.edit();
        editor.clear();
        // add your logic here
        //editor.putBoolean("prefName", false);
        //editor.putInt("userId", -1);
        editor.commit();
 }

然后使用如下所示的代码

userId = yourPreferences.getBoolean("userId", -1);