我有一些位置查找代码,当我在等待读取相应的准确度时,我也希望暂停并使用读取的最佳位置。
我似乎误解了如何取消和重新启动计时器。
我想在开始搜索时启动超时计时器,并在每次重复搜索时重启计时器...
private void refreshLocation() {
if (locationTimeoutTimer != null) {
locationTimeoutTimer.cancel();
locationTimeoutTimer.purge();
}
locationTimeoutTimer = new Timer();
locationTimeoutTimer.schedule(timeoutReached, 60000);
//Do other things...
}
但是,每当第二次调用此refreshLocation时,我都会收到以下错误。
java.lang.IllegalStateException: TimerTask is scheduled already
答案 0 :(得分:3)
您的代码与我的代码非常相似 - 这是有效的。但我注意到的一些差异是
locationTimer = new Timer("locationtimer", true);
locationTimer.schedule(new timeoutReached(), 60000);
答案 1 :(得分:0)
计时器在UI上无法正常运行。决不。 使用处理程序。您也可以参加我的课程: 它启动/停止计时并在已注册的TextView字段中显示时间和/或日期。
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import android.os.Handler;
import android.widget.TextView;
/**
* The class for creating and refreshing many different fields on different layouts,
* that can hold actual time and/or date in different formats
* The formats should be as in http://developer.android.com/reference/java/text/SimpleDateFormat.html.
* Only present and visible fields are being actualized, so there is no need to clean the clock list after closing an activity
*
* Examples of use:
*
* Clock.registerClock((TextView) findViewById(R.id.TimeField), "HH:mm");
* Clock.registerClock((TextView) findViewById(R.id.DateField), "d.M.yyyy EEE");
* Clock.start(10000L);
*
* @author Petr Gangnus
*/
public final class Clock {
/**
* the handler that works instead of timer and supports UI
*/
static private Handler handler = new Handler();
/**
* the interval of the time refreshing
*/
static private long refreshStep;
/**
* pairs TextView timer+time/date format
*/
private TextView clockFace;
private String format;
private Clock(TextView clockFace, String format){
this.clockFace=clockFace;
this.format=format;
}
// here is the list of views containing the visual timers that should be held actual
static private ArrayList<Clock> clocks=new ArrayList<Clock>();
/**
* fills all timer fields by actual time value, according to their formats.
*/
static private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
for(Clock clock:clocks){
showActualTimeDate(clock);
}
handler.postDelayed(this,refreshStep);
}
};
//============================================ public members ====================================================================
/**
* add a clock to the list of updating clocks
* @param clockFace - the place where the time or date will be shown
* @param format - the format of the time/date
* @return
*/
public static boolean registerClock(TextView clockFace, String format){
if (clockFace==null) return false;
if(clocks.contains(clockFace)){
// old clockFace
clocks.get(clocks.indexOf(clockFace)).format=format;
} else {
// new clockFace
clocks.add(new Clock(clockFace, format));
}
return true;
}
/**
* remove a clock from the updating list
* @param clockFace
* @return
*/
public static boolean unRegisterClock(TextView clockFace){
if (clockFace==null) return false;
if(clocks.contains(clockFace)){
// found clockFace
clocks.remove(clocks.indexOf(clockFace));
} else {
// not found clockFace
return false;
}
return true;
}
/**
* put in the "place" the actual date/time in the appropriate "format"
* @param place
* @param format
*/
public static void showActualTimeDate(Clock clock){
if (clock.clockFace==null) return;
if (clock.clockFace.getVisibility()!=TextView.VISIBLE) return;
Date thisDate=new Date();
SimpleDateFormat df=new SimpleDateFormat(clock.format);
clock.clockFace.setText(df.format(thisDate));
}
/**
* start the ticking for all clocks
* @param step the tick interval
*/
public static void start(long step) {
refreshStep=step;
handler.removeCallbacks(mUpdateTimeTask);
handler.postDelayed(mUpdateTimeTask, 0);
}
/**
* Stopping ticking all clocks (not removing them)
* the calling could be put somewhere in onStop
*/
public static void stop() {
handler.removeCallbacks(mUpdateTimeTask);
}
}