我正在制作一个仅用于教育目的的示例应用程序,我每分钟都会创建一个通知。我还有一个取消闹钟的按钮。
我所做的是,当通知到来时,我单击它并单击我设置为运行 unsetAlarm() 的未设置按钮。但它每分钟都在困扰着我。
如何停止通知?会不会是活动以某种方式重复?如果是这种情况,我如何确保只有一个 MainActivity 实例?
MainActivity 类
package no.perandersen.notifyontimeexample;
import java.util.Calendar;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
public class MainActivity extends Activity {
private AlarmManager alarmManager;
private PendingIntent notifyIntent;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
}
public void setAlarm(View v) {
Intent myIntent = new Intent(MainActivity.this,
NotificationService.class);
notifyIntent = PendingIntent.getService(MainActivity.this, 0,
myIntent, 0);
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MINUTE, 1);
Log.v(TAG, "time for alarm trigger:" + calendar.getTime().toString());
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
calendar.getTimeInMillis(), 1 * 60 * 1000, notifyIntent);
}
public void unsetAlarm(View v) {
alarmManager.cancel(notifyIntent);
Log.v(TAG, "cancelling notification");
}
}
通知服务类
package no.perandersen.notifyontimeexample;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
public class NotificationService extends Service {
private NotificationManager nm;
private static final String TAG = "NotificationService";
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
Log.v(TAG, "on onCreate");
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Log.v(TAG, "on onStartCommand");
Intent mainActivityIntent = new Intent(this, MainActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, mainActivityIntent, 0);
Notification notification = new NotificationCompat.Builder(this)
.setContentTitle("bothering you")
.setContentText("Just bothering you from example code")
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pIntent)
.build();
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.flags |= Notification.FLAG_SHOW_LIGHTS;
notification.defaults |= Notification.DEFAULT_SOUND;
notification.defaults |= Notification.DEFAULT_VIBRATE;
notification.defaults|= Notification.DEFAULT_LIGHTS;
nm.notify(0, notification);
return super.onStartCommand(intent, flags, startId);
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
}