Question

我把手机连接到Eclipse，但是在手机“完全”启动并且我的接收器（应用程序）崩溃之前我无法看到logcat，所以我无法调试它。我确定它必须对上下文和意图做一些事情：

由于上下文问题，我的接收器在启动时崩溃了：我确定：

 public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Calendar c2 = Calendar.getInstance();               
    int hour = c2.get(Calendar.HOUR_OF_DAY);
    int minute = c2.get(Calendar.MINUTE);
    int sek = c2.get(Calendar.SECOND);

    int dan;
    int dodaj;

    milivreme = ((hour * 60 * 60 * 1000)+ (minute * 60 * 1000) + (sek * 1000));

    Cursor cursor = DatabaseManager.getAllData();

    cursor.moveToFirst();
    if (!cursor.isAfterLast())
    {
        do
        {               
    milibaza = cursor.getInt(3);
    razlika = milibaza - milivreme;

    Intent intent1 = new Intent(context, AlarmReceiver.class);
    PendingIntent pendingintent = PendingIntent.getService(context, 2, intent1, PendingIntent.FLAG_CANCEL_CURRENT);
    AlarmManager am = (AlarmManager) context.getSystemService(context.ALARM_SERVICE);

    am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + razlika, pendingintent);
        }
        while (cursor.moveToNext());
    }
}

更新，最终设法捕获异常：

01-06 02:21:19.920: E/AndroidRuntime(7360): java.lang.RuntimeException: Unable to start receiver com.example.prva.OnBootReceiver: java.lang.NullPointerException

Answer 1

你应该只使用上下文，用上下文替换上下文，你应该没问题。

Answer 2

由于您的代码问题不明确，但有一些建议可供您使用。

1）您的变量milivreme，milibaza等必须是long类型而不是int。

2）代替下面的代码，只需使用milivreme = System.currentTimeMillis();，它以毫秒为单位给出当前时间。

    Calendar c = Calendar.getInstance();                
    int hour = c.get(Calendar.HOUR_OF_DAY);
    int minute = c.get(Calendar.MINUTE);
    int sek = c.get(Calendar.SECOND);
    int dan;
    int dodaj;

    milivreme = ((hour * 60 * 60 * 1000)+ (minute * 60 * 1000) + (sek * 1000));

3）检查游标是否为空。在cursor.moveToFirst();之前

4）看到这一行＆gt;＆gt;

PendingIntent pendingintent = PendingIntent.getService(context, 2, intent1, PendingIntent.FLAG_CANCEL_CURRENT);
        AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

Answer 3

您应该使用Context context，而不是Context contextic。

private Context contextic;    //    NEEDLEES !
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Calendar c = Calendar.getInstance();                
    int hour = c.get(Calendar.HOUR_OF_DAY);
    int minute = c.get(Calendar.MINUTE);
    int sek = c.get(Calendar.SECOND);
    int dan;
    int dodaj;

    milivreme = ((hour * 60 * 60 * 1000)+ (minute * 60 * 1000) + (sek * 1000));

    Cursor cursor = DatabaseManager.getAllData();

    cursor.moveToFirst();
    if (!cursor.isAfterLast())
    {
        do
        {               
    milibaza = cursor.getInt(3);
    razlika = milibaza - milivreme;

    Intent intent1 = new Intent(context, AlarmReceiver.class);
    PendingIntent pendingintent = PendingIntent.getService(context, 2, intent1, PendingIntent.FLAG_CANCEL_CURRENT);
    AlarmManager am = (AlarmManager) context.getSystemService(context.ALARM_SERVICE); //CONTEXT ! 

    am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + razlika, pendingintent);
        }
        while (cursor.moveToNext());
    }}

我的问题：为什么你写while (cursor.moveToNext());（问题是你在循环后使用分号）？

如果我的回答没有帮助，请给堆叠跟踪。

Android On Boot Receiver崩溃

3 个答案: