在Android中重用-为什么我不能设置一个重复警报,并使用同一个PendingEvent实例取消它?
在同一活动中将onClick in activity_main.xml绑定为将报警设置为一个按钮,并将报警取消设置为另一个按钮时,单击链接到取消设置报警方法的按钮时,以下代码将不允许您取消设置报警在Android中重用-为什么我不能设置一个重复警报,并使用同一个PendingEvent实例取消它?,android,field,reusability,android-pendingintent,Android,Field,Reusability,Android Pendingintent,在同一活动中将onClick in activity_main.xml绑定为将报警设置为一个按钮,并将报警取消设置为另一个按钮时,单击链接到取消设置报警方法的按钮时,以下代码将不允许您取消设置报警 ...package name and includes ommitted... public class MainActivity extends Activity { private AlarmManager alarmManager; private PendingInten
...package name and includes ommitted...
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");
}
}
解决方案是,正如我在“未设置报警”方法中重新创建PendingEvent中所提供的那样:
public void unsetAlarm(View v) {
Intent myIntent = new Intent(MainActivity.this,
NotificationService.class);
notifyIntent = PendingIntent.getService(MainActivity.this, 0,
myIntent, 0); // recreate it here before calling cancel
alarmManager.cancel(notifyIntent);
Log.v(TAG, "cancelling notification");
}
我的问题是:为什么我不能重用pendingent,它存储在第一个代码片段的notifyIntent字段中?为什么我必须重新创建才能取消它?我已经将MainActivity的属性设置为android:launchMode=singleInstance,所以当我单击NotificationService中创建的通知时,我应该相信它使用的是同一个实例,我已经通知了它,但它只是显示了一个通知