java - AlarmManager 重置显示错误 在 onCreate() 之前系统服务不可用于 Activity

Question

Android 手机重新启动后，我通过 SQLi 的查询日期重置 Alarmmanager 以设置 Alarmmanager。

这是手机重启后的 AlarmReset 类，该类查询数据以与 setAlarm() 方法一起使用。

public class AlarmReset  extends BroadcastReceiver {

    SQLiteDatabase db;
    DBHelper dbHelper ;
    Cursor cursor;
    String sNotes;

    @Override
    public void onReceive(Context context, Intent intent) {

        AlarmUtils au = new AlarmUtils();
        dbHelper = new DBHelper(context);

        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            // Set the alarm here.

            db = dbHelper.getWritableDatabase();

            String[] queryColumns = new String[]{DBHelper.COL_DATE,DBHelper.COL_RQCODE , DBHelper.COL_VEHICLE_TYPE, DBHelper.COL_OPTION_NAME};
           cursor = db.query(DBHelper.TABLE_NAME, queryColumns,null,null,null,null,null);

                while (cursor.moveToNext()) {

                    au.setAlarm(context,cursor.getString(0), Integer.parseInt(cursor.getString(1)), "Test !");

                }

            }
            db.close();

    }

}

这是类 AlarmUtils，用于创建方法 setAlarm()，它设置了 Alarmmanager。

public class AlarmUtils  extends AppCompatActivity {

    public void setAlarm(Context context, String alarmDate, int rq_Code, String sNotes) {


        String[] parts = alarmDate.split("-");

        String day = parts[0];
        String month = parts[1];
        String year = parts[2];
        Calendar next1 = Calendar.getInstance();
        next1.set(Calendar.YEAR, Integer.parseInt(year));//year...
        next1.set(Calendar.MONTH, Integer.parseInt(month)-1);  //first month is 0!!! January is zero!!!
        next1.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day)-1);  //1-31

        next1.set(Calendar.HOUR_OF_DAY,19);  //HOUR
        next1.set(Calendar.MINUTE,0);       //MIN
        next1.set(Calendar.SECOND, 2);       //SEC

        Intent myIntent = new Intent(context, AlarmReceiver.class);
        myIntent.putExtra("Title", "Title");
        myIntent.putExtra("Notes", sNotes);


        PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, rq_Code, myIntent, 0);


        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, next1.getTimeInMillis(), DateUtils.DAY_IN_MILLIS,pendingIntent1);

    }

}

当我运行此代码时，它显示这样的错误。

10-30 00:07:09.889 3303-3303/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.max.driver_app, PID: 3303
java.lang.RuntimeException: Unable to start receiver com.example.max.driver_app.AlarmReset: java.lang.IllegalStateException: System services not available to Activities before onCreate()
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2438)
    at android.app.ActivityThread.access$1700(ActivityThread.java:143)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1285)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5059)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:818)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
    at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate()
    at android.app.Activity.getSystemService(Activity.java:4600)
    at com.example.max.driver_app.AlarmUtils.setAlarm(AlarmUtils.java:61)
    at com.example.max.driver_app.AlarmReset.onReceive(AlarmReset.java:64)
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2431)
    at android.app.ActivityThread.access$1700(ActivityThread.java:143) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1285) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:136) 
    at android.app.ActivityThread.main(ActivityThread.java:5059) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:818) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634) 
    at dalvik.system.NativeStart.main(Native Method) 

setAlarm(AlarmUtils.java:61) 是类 AlarmUtils 行

AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

onReceive(AlarmReset.java:64) 是类 AlarmReset 行

au.setAlarm(context,cursor.getString(0), Integer.parseInt(cursor.getString(1)), "Test !");

如何解决？

Answer 1

只需使用上下文初始化 AlarmManager，以便进行更改
AlarmManager AlarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

to:   

AlarmManager AlarmManager = (AlarmManager) context.getSystemService(ALARM_SERVICE);