Question

我目前正在尝试设置日期选择器和时间选择器，以便在到达时间时发出通知。我在MainActivity中创建了一个方法，这是从AlarmReceiver调用的。每次计时器达到设定的数量时，应用程序都会崩溃，并且logcat中没有显示任何错误。

我知道这是从AlarmReceiver调用此方法的事情，我只是不知道问题是什么。此方法当前也链接到按下时按下的按钮（buttonStopAlarm）按需要按下时触发通知）所以整个方法确实有效，从另一个类调用它时就不起作用了。

任何帮助将不胜感激！谢谢！

AlarmReceiver

package servicealarmdemo.test2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver {

MainActivity main = new MainActivity();

@Override
public void onReceive(Context arg0, Intent arg1) {
    Toast.makeText(arg0, "Alarm received!", Toast.LENGTH_LONG).show();

    main.addNotification();

}

}

Answer 1

通过执行此操作MainActivity main = new MainActivity();，您只是创建MainActivity的实例，但它不会context意味着this，这基本上是Activity {1}}由OS

启动

所以在Notification code移动你Receiver并使用arg0作为context

public class AlarmReceiver extends BroadcastReceiver {

//MainActivity main = new MainActivity();

    Context cxt;

    @Override
    public void onReceive(Context arg0, Intent arg1) {
        Toast.makeText(arg0, "Alarm received!", Toast.LENGTH_LONG).show();
        cxt = arg0;

        //main.addNotification();
        addNotification();

    }

    public void addNotification() {
        NotificationCompat.Builder builder =
                new NotificationCompat.Builder(cxt)
                        .setSmallIcon(R.drawable.icon_transperent)
                        .setContentTitle("Achieve Alert!")
                        .setContentText("This is a reminder for your deadline!");

        Intent notificationIntent = new Intent(cxt, MainActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(cxt, 0, notificationIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(contentIntent);

        // Add as notification
        NotificationManager manager = (NotificationManager)cxt.getSystemService(Context.NOTIFICATION_SERVICE);
        builder.setVibrate(new long[] { 0, 1000, 1000, 1000, 1000 });
        manager.notify(0, builder.build());
    }

}

AlarmReceiver＆amp;导致崩溃的通知方法？

1 个答案: