我设置了一个首选项屏幕,其中有一个列表首选项,允许用户选择通知他们的时间间隔。
他们可以选择是否每 2、4、8、10 或 12 小时通知一次。
这是我的列表偏好:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<ListPreference
android:title="Notification Timer"
android:summary="Select when to Notify"
android:dialogTitle="Show Notification after every:"
android:positiveButtonText="OK"
android:negativeButtonText="Cancel"
android:entries="@array/entries"
android:entryValues="@array/entries"
android:key="listPrefs" />
</PreferenceScreen>
这是我的 Settings.class 文件:
public class Settings extends PreferenceActivity implements OnPreferenceChangeListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
ListPreference listPreference = (ListPreference) findPreference("listPrefs");
listPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
return false;
}
});
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
// TODO Auto-generated method stub
return false;
}
}
每次用户更改通知他/她的时间间隔时,我都想更新或重置警报。对于前 - 如果用户选择 4 小时,则必须在 4 小时后通知他/她,或者如果用户选择 10 小时,则必须在 10 小时后通知他/她!
最佳答案
请按照以下步骤操作:
将以下方法复制到您的 Setting.java 文件中:
private final int NOTIFICATION_TIMER = 11; public void setAlarm(Context mContext,int requestCode,long time) { Intent myIntent = new Intent(mContext, AlarmReceiver.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, requestCode, myIntent,0); cancelAlarmIfExists(mContext,requestCode,myIntent); AlarmManager alarmManager = (AlarmManager)mContext.getSystemService(ALARM_SERVICE); alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, (System.currentTimeMillis()+time), time, pendingIntent); } public void cancelAlarmIfExists(Context mContext,int requestCode,Intent intent){ try { PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, requestCode, intent,0); AlarmManager am=(AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE); am.cancel(pendingIntent); } catch (Exception e) { e.printStackTrace(); } }
从
onPreferenceChange()
方法中调用它们。像这样:listPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object newValue) { long time = 34352355253; // calculate millisecons from change value by user. setAlarm(Settings.this,NOTIFICATION_TIMER,time); return false; } });
关于android - 如何编辑/重置警报管理器?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25009195/