Question

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void scheduleAlarm(View V){
        //Long time= new GregorianCalendar().getTimeInMillis()+24*60*60*1000;
        Long time= new GregorianCalendar().getTimeInMillis()+30*1000;
            Intent intentAlarm= new Intent(this, AlarmReceiver.class);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, time, PendingIntent.getBroadcast(this, 1, intentAlarm, PendingIntent.FLAG_UPDATE_CURRENT));
        Toast.makeText(this, "Alarm Scheduled for 30 repetd", Toast.LENGTH_LONG).show();
    }


}

AlarmReceiverClass

   public class AlarmReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub

            Toast.makeText(context, "Alarm Triggered and SMS Sent", Toast.LENGTH_LONG);
        }

    }

这是我的代码我试图设置警报并在每30秒显示警报消息但是我无法在吐司中显示警报混乱，而我写代码所有的事情都正确但我不知道在哪里做错了请看看我的代码，请告诉我哪里出错了。

Answer 1

首先请在吐司中添加.show()。即Toast.makeText(context, "Alarm Triggered and SMS Sent", Toast.LENGTH_LONG).show();

编辑

请使用以下代码：

清单中的

 <receiver android:name=".alarm.manager.Alarm" >
        </receiver>

创建一个名为AlarmService.java

的新类

public class AlarmService extends Service {
    Alarm alarm = new Alarm();

    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        alarm.SetAlarm(AlarmService.this);
        return START_STICKY;
    }

    public void onStart(Context context, Intent intent, int startId) {
        alarm.SetAlarm(context);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

另一类alarm.java

package alarm.manager;


import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.PowerManager;
import android.util.Log;





public class Alarm extends BroadcastReceiver  {


    public static final String ALARM_SERVICE = "alarm";

    public Alarm() {

    }




    Context mContext;

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @SuppressLint("NewApi")
    @Override
    public void onReceive(Context context, Intent intent) {

        PowerManager pm = (PowerManager) context
                .getSystemService(Context.POWER_SERVICE);
        PowerManager.WakeLock wl = pm.newWakeLock(
                PowerManager.PARTIAL_WAKE_LOCK, "");
        wl.acquire();
        mContext = context;


        Log.d("App", "Alarm manager invoked");



        wl.release();
    }


    public void SetAlarm(Context context) {
        AlarmManager am = (AlarmManager) context
                .getSystemService(Context.ALARM_SERVICE);

        Intent i = new Intent(context, Alarm.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
        am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
                1000, pi); 

    }

    /**
     * Stop alarm
     * 
     * @param context
     *            = context of activity
     */
    public void CancelAlarm(Context context) {
        Intent intent = new Intent(context, Alarm.class);
        PendingIntent sender = PendingIntent
                .getBroadcast(context, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) context
                .getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(sender);
    }



}

你班上的

叫这些行

Alarm alarm = new Alarm();
alarm.SetAlarm(getApplicationContext());

Answer 2

您错过了为.show()调用Toast方法。所以它将是

Toast.makeText(context, "Alarm Triggered and SMS Sent", Toast.LENGTH_LONG).show();

设置警报时无法显示警报消息

2 个答案: