在我的android清单中,我已经定义了一个这样的broadcastReceiver:
package com.myexample.mycompany.countdownapp;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//10 seconds later
Calendar cal = Calendar.getInstance();
cal.add(Calendar.SECOND, 0);
AlarmManager alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, WarningReceiver.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
alarmMgr.set(AlarmManager.ELAPSED_REALTIME,
cal.getTimeInMillis(), alarmIntent);
}
public static class WarningReceiver extends BroadcastReceiver {
public Void sendWarningEvent() throws Exception {
// fire off warning event
Log.v("WarningReceiver", "sendWarningEvent called from WarningReceiver");
return null;
}
@Override
public void onReceive(Context context, Intent intent) {
try {
Toast.makeText(context,
"WarningReceiver.onReceive()",
Toast.LENGTH_LONG).show();
sendWarningEvent();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
然后在我的mainActivity中我有一个WarningReceiver类。整个mainActivity非常小,看起来像这样:
{{1}}
当我运行应用程序时,没有任何东西被解雇。我做错了什么?
答案 0 :(得分:3)
试试这个:
alarmMgr.set(AlarmManager.RTC_WAKEUP,cal.getTimeInMillis(), alarmIntent);
而不是:
alarmMgr.set(AlarmManager.ELAPSED_REALTIME,cal.getTimeInMillis(), alarmIntent);