dinesh707 dinesh707 - 3 months ago 8
Java Question

How to "wait" a Thread in Android

private void startGameTimeElapseThread(){
new Thread(new Runnable() {
Date d = new Date();
public void run() {
while (gameOn){
Log.d(TAG,""+d.getTime()+" "+gameStatus.getLastTimeUpdated());

postInvalidate(795, 150, 1024, 300);
try {
synchronized (this) {
wait(1000);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
Log.d(TAG, "Waiting didnt work!!");
e.printStackTrace();
}
}
}
}).start();
}


Here I wanted to make call the "Log.d" and "postInvalidate" every one second. But when i check it from LogCat it seems loop runs faster than i want it to be. Why doesnt this loop just wait for 1000ms ?

Following are the output in LogCat. So you can see its not sleeping for a 1 second at all. I used Thread.sleep as well ( after you suggesting )

05-27 11:40:10.060: DEBUG/NOPSA-P(4546): 1306496408950 1306496387535
05-27 11:40:10.070: DEBUG/NOPSA-P(4546): 1306496410037 1306496387535
05-27 11:40:10.232: DEBUG/NOPSA-P(4546): 1306496410201 1306496387535
05-27 11:40:10.250: DEBUG/NOPSA-P(4546): 1306496408214 1306496387535
05-27 11:40:10.310: DEBUG/NOPSA-P(4546): 1306496405988 1306496387535
05-27 11:40:10.361: DEBUG/NOPSA-P(4546): 1306496409327 1306496387535
05-27 11:40:10.431: DEBUG/NOPSA-P(4546): 1306496410398 1306496387535
05-27 11:40:10.521: DEBUG/NOPSA-P(4546): 1306496409478 1306496387535
05-27 11:40:10.593: DEBUG/NOPSA-P(4546): 1306496410566 1306496387535
05-27 11:40:11.230: DEBUG/NOPSA-P(4546): 1306496409678 1306496387535
05-27 11:40:11.230: DEBUG/NOPSA-P(4546): 1306496410201 1306496387535
05-27 11:40:11.241: DEBUG/NOPSA-P(4546): 1306496409878 1306496387535
05-27 11:40:11.241: DEBUG/NOPSA-P(4546): 1306496410037 1306496387535
05-27 11:40:11.241: DEBUG/NOPSA-P(4546): 1306496408950 1306496387535
05-27 11:40:11.260: DEBUG/NOPSA-P(4546): 1306496408214 1306496387535
05-27 11:40:11.314: DEBUG/NOPSA-P(4546): 1306496405988 1306496387535
05-27 11:40:11.314: DEBUG/NOPSA-P(4546): 1306496411254 1306496387535
05-27 11:40:11.361: DEBUG/NOPSA-P(4546): 1306496409327 1306496387535
05-27 11:40:11.431: DEBUG/NOPSA-P(4546): 1306496410398 1306496387535
05-27 11:40:11.520: DEBUG/NOPSA-P(4546): 1306496409478 1306496387535
05-27 11:40:11.551: DEBUG/NOPSA-P(4546): 1306496411508 1306496387535
05-27 11:40:11.712: DEBUG/NOPSA-P(4546): 1306496410566 1306496387535
05-27 11:40:11.881: DEBUG/NOPSA-P(4546): 1306496411865 1306496387535
05-27 11:40:12.051: DEBUG/NOPSA-P(4546): 1306496412025 1306496387535
05-27 11:40:12.211: DEBUG/NOPSA-P(4546): 1306496412198 1306496387535
05-27 11:40:12.231: DEBUG/NOPSA-P(4546): 1306496409678 1306496387535
05-27 11:40:12.242: DEBUG/NOPSA-P(4546): 1306496410201 1306496387535
05-27 11:40:12.251: DEBUG/NOPSA-P(4546): 1306496408950 1306496387535
05-27 11:40:12.251: DEBUG/NOPSA-P(4546): 1306496409878 1306496387535
05-27 11:40:12.251: DEBUG/NOPSA-P(4546): 1306496410037 1306496387535
05-27 11:40:12.261: DEBUG/NOPSA-P(4546): 1306496408214 1306496387535
05-27 11:40:12.311: DEBUG/NOPSA-P(4546): 1306496405988 1306496387535
05-27 11:40:12.341: DEBUG/NOPSA-P(4546): 1306496411254 1306496387535
05-27 11:40:12.371: DEBUG/NOPSA-P(4546): 1306496409327 1306496387535
05-27 11:40:12.442: DEBUG/NOPSA-P(4546): 1306496410398 1306496387535
05-27 11:40:12.471: DEBUG/NOPSA-P(4546): 1306496412431 1306496387535
05-27 11:40:12.521: DEBUG/NOPSA-P(4546): 1306496409478 1306496387535
05-27 11:40:12.553: DEBUG/NOPSA-P(4546): 1306496411508 1306496387535
05-27 11:40:12.671: DEBUG/NOPSA-P(4546): 1306496412639 1306496387535
05-27 11:40:12.711: DEBUG/NOPSA-P(4546): 1306496410566 1306496387535
05-27 11:40:12.841: DEBUG/NOPSA-P(4546): 1306496412813 1306496387535
05-27 11:40:12.891: DEBUG/NOPSA-P(4546): 1306496411865 1306496387535
05-27 11:40:13.001: DEBUG/NOPSA-P(4546): 1306496412983 1306496387535
05-27 11:40:13.051: DEBUG/NOPSA-P(4546): 1306496412025 1306496387535
05-27 11:40:13.193: DEBUG/NOPSA-P(4546): 1306496413166 1306496387535
05-27 11:40:13.231: DEBUG/NOPSA-P(4546): 1306496409678 1306496387535
05-27 11:40:13.251: DEBUG/NOPSA-P(4546): 1306496410201 1306496387535
05-27 11:40:13.251: DEBUG/NOPSA-P(4546): 1306496409878 1306496387535
05-27 11:40:13.251: DEBUG/NOPSA-P(4546): 1306496410037 1306496387535
05-27 11:40:13.251: DEBUG/NOPSA-P(4546): 1306496408950 1306496387535
05-27 11:40:13.261: DEBUG/NOPSA-P(4546): 1306496408214 1306496387535
05-27 11:40:13.271: DEBUG/NOPSA-P(4546): 1306496412198 1306496387535
05-27 11:40:13.321: DEBUG/NOPSA-P(4546): 1306496405988 1306496387535
05-27 11:40:13.341: DEBUG/NOPSA-P(4546): 1306496411254 1306496387535
05-27 11:40:13.371: DEBUG/NOPSA-P(4546): 1306496409327 1306496387535
05-27 11:40:13.431: DEBUG/NOPSA-P(4546): 1306496413405 1306496387535
05-27 11:40:13.441: DEBUG/NOPSA-P(4546): 1306496410398 1306496387535
05-27 11:40:13.481: DEBUG/NOPSA-P(4546): 1306496412431 1306496387535
05-27 11:40:13.532: DEBUG/NOPSA-P(4546): 1306496409478 1306496387535


This is the latest Code.
gameOn
is a boolean, for now it's true.

private void startGameTimeElapseThread(){
if (gameOn){
new Thread(new Runnable() {
Date d = new Date();
public void run() {

Log.d(TAG,""+d.getTime()+"ms "+d.getTime()/1000+"sec");
postInvalidate(795, 150, 1024, 300);
android.os.SystemClock.sleep(1000);
startGameTimeElapseThread();

}
}).start();
}
}


The output is

05-27 12:00:51.211: DEBUG/NOPSA-P(5098): 1306497650761ms 1306497650sec
05-27 12:00:51.211: DEBUG/NOPSA-P(5098): 1306497650786ms 1306497650sec
05-27 12:00:51.221: DEBUG/NOPSA-P(5098): 1306497650764ms 1306497650sec
05-27 12:00:51.221: DEBUG/NOPSA-P(5098): 1306497650763ms 1306497650sec
05-27 12:00:51.221: DEBUG/NOPSA-P(5098): 1306497650769ms 1306497650sec
05-27 12:00:51.231: DEBUG/NOPSA-P(5098): 1306497650749ms 1306497650sec
05-27 12:00:51.231: DEBUG/NOPSA-P(5098): 1306497650736ms 1306497650sec
05-27 12:00:51.231: DEBUG/NOPSA-P(5098): 1306497650742ms 1306497650sec
05-27 12:00:51.241: DEBUG/NOPSA-P(5098): 1306497650746ms 1306497650sec
05-27 12:00:51.241: DEBUG/NOPSA-P(5098): 1306497650848ms 1306497650sec
05-27 12:00:51.251: DEBUG/NOPSA-P(5098): 1306497650729ms 1306497650sec
05-27 12:00:51.271: DEBUG/NOPSA-P(5098): 1306497650739ms 1306497650sec
05-27 12:00:51.271: DEBUG/NOPSA-P(5098): 1306497650739ms 1306497650sec
05-27 12:00:51.271: DEBUG/NOPSA-P(5098): 1306497650868ms 1306497650sec
05-27 12:00:51.271: DEBUG/NOPSA-P(5098): 1306497650798ms 1306497650sec
05-27 12:00:51.281: DEBUG/NOPSA-P(5098): 1306497650870ms 1306497650sec
05-27 12:00:51.291: DEBUG/NOPSA-P(5098): 1306497651020ms 1306497651sec
05-27 12:00:51.551: DEBUG/NOPSA-P(5098): 1306497651498ms 1306497651sec
05-27 12:00:51.551: DEBUG/NOPSA-P(5098): 1306497651502ms 1306497651sec
05-27 12:00:51.642: DEBUG/NOPSA-P(5098): 1306497651523ms 1306497651sec
05-27 12:00:51.651: DEBUG/NOPSA-P(5098): 1306497651537ms 1306497651sec
05-27 12:00:51.691: DEBUG/NOPSA-P(5098): 1306497651529ms 1306497651sec
05-27 12:00:51.701: DEBUG/NOPSA-P(5098): 1306497651534ms 1306497651sec
05-27 12:00:51.784: DEBUG/NOPSA-P(5098): 1306497651527ms 1306497651sec
05-27 12:00:51.801: DEBUG/NOPSA-P(5098): 1306497651570ms 1306497651sec
05-27 12:00:51.801: DEBUG/NOPSA-P(5098): 1306497651564ms 1306497651sec
05-27 12:00:51.891: DEBUG/NOPSA-P(5098): 1306497651682ms 1306497651sec
05-27 12:00:51.891: DEBUG/NOPSA-P(5098): 1306497651690ms 1306497651sec
05-27 12:00:51.891: DEBUG/NOPSA-P(5098): 1306497651685ms 1306497651sec
05-27 12:00:51.901: DEBUG/NOPSA-P(5098): 1306497651693ms 1306497651sec
05-27 12:00:51.914: DEBUG/NOPSA-P(5098): 1306497651647ms 1306497651sec
05-27 12:00:51.914: DEBUG/NOPSA-P(5098): 1306497651667ms 1306497651sec
05-27 12:00:51.921: DEBUG/NOPSA-P(5098): 1306497651666ms 1306497651sec
05-27 12:00:51.921: DEBUG/NOPSA-P(5098): 1306497651658ms 1306497651sec
05-27 12:00:51.921: DEBUG/NOPSA-P(5098): 1306497651663ms 1306497651sec
05-27 12:00:51.932: DEBUG/NOPSA-P(5098): 1306497651688ms 1306497651sec
05-27 12:00:51.941: DEBUG/NOPSA-P(5098): 1306497651711ms 1306497651sec
05-27 12:00:51.961: DEBUG/NOPSA-P(5098): 1306497651792ms 1306497651sec
05-27 12:00:51.971: DEBUG/NOPSA-P(5098): 1306497651629ms 1306497651sec
05-27 12:00:51.981: DEBUG/NOPSA-P(5098): 1306497651714ms 1306497651sec
05-27 12:00:52.083: DEBUG/NOPSA-P(5098): 1306497652048ms 1306497652sec

Answer

You need the sleep method of the Thread class.

public static void sleep (long time)

Causes the thread which sent this message to sleep for the given interval of time (given in milliseconds). The precision is not guaranteed - the Thread may sleep more or less than requested.

Parameters

time The time to sleep in milliseconds.

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