How to reset alarm after reboot Android Studio

问题

I'm making an Alarm app which opens an activity based on time picked by User. Everything's working perfectly fine but alarm gets reset by reboot. I made an ON BOOT RECEIVER which works but I want to restart the Alarm only if the user wants it to go. I tried to use .putExtra to send data to ON BOOT broadcast but that data gets reset after reboot. I tried to set conditions using SharedPreference in broadcast but I'm stuck on how to use it. MainActivity

public class MainActivity extends AppCompatActivity {
NumberPicker hour;
NumberPicker min;
Button start;
Button stop;
TextView number;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    hour = (NumberPicker) findViewById(R.id.hour);
    min = (NumberPicker) findViewById(R.id.min);
    start = (Button) findViewById(R.id.starter);
    stop = (Button) findViewById(R.id.stopper);

    number = (TextView) findViewById(R.id.textView);

    hour.setMinValue(0);
    hour.setMaxValue(23);
    hour.setWrapSelectorWheel(false);

    min.setMinValue(1);
    min.setMaxValue(59);
    min.setWrapSelectorWheel(false);

    SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
    final int myIntValue = sp.getInt("your_int_key", -1);

    Intent myIntent = new Intent(MainActivity.this, BootCompletedReceiver.class);

    if (myIntValue == 1){

        myIntent.putExtra("alarm", 3);
        sendBroadcast(myIntent);

    }
    else if (myIntValue == 2){

       myIntent.putExtra("alarm", 4);
       sendBroadcast(myIntent);

    }
    else
    { stop.setBackgroundColor(Color.RED); }


    start.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Calendar calendar = Calendar.getInstance();
            calendar.set(Calendar.HOUR_OF_DAY, hour.getValue());
            calendar.set(Calendar.MINUTE, min.getValue());

            Intent intent = new Intent(getApplicationContext(),notification.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 120*1000, pendingIntent);


            SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
            SharedPreferences.Editor editor = sp.edit();
            editor.putInt("your_int_key", 1);
            editor.apply();

        }
    });

    stop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(getApplicationContext(),notification.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarmManager.cancel(pendingIntent);

            SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
            SharedPreferences.Editor editor = sp.edit();
            editor.putInt("your_int_key", 2);
            editor.apply();

        }
    });

}}

Broadcast

public class BootCompletedReceiver extends BroadcastReceiver {



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

 if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {

        Intent i = new Intent(context, RestartAlarmsService.class);

        //ComponentName service = context.startService(i);
        context.startService(i);


    }
}}

Service

public class RestartAlarmsService extends Service {

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}
public int onStartCommand(Intent intent, int flags, int startId) {

    //code to restart Alarm

    return START_NOT_STICKY;
}

}

Thank you.

来源：https://stackoverflow.com/questions/39442607/how-to-reset-alarm-after-reboot-android-studio