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所以我试图创建一个简单的计时器应用程序,将经过的时间输出到屏幕。我正在尝试加入一个暂停按钮。它似乎工作,除非暂停按钮被关闭到x:x:1〜(min:sec:milli)的值,如果您再次取消暂停和快速重新使用,则下一个显示值将在x:x:N(N> 1)而不是x:x-1:9〜。下面的Logcat输出。 DISPLAY是显示的时间(剩余时间,应该总是减少,但不是)。经过时间是经过内部时间(总是越来越多,所以看起来这是确定)低于定时器textview显示不总是显示递减值,不同步
10-09 23:28:16.152: D/ClockView(16547): ELAPSED TIME 1728
10-09 23:28:16.152: D/ClockView(16547): DISPLAY 0:8:272
10-09 23:28:16.252: D/ClockView(16547): ELAPSED TIME 1829
10-09 23:28:16.252: D/ClockView(16547): DISPLAY 0:8:171
10-09 23:28:16.282: D/ClockView(16547): PAUSE PRESSED
10-09 23:28:16.983: D/ClockView(16547): PAUSE PRESSED
10-09 23:28:16.983: D/ClockView(16547): ELAPSED TIME 1868
10-09 23:28:16.983: D/ClockView(16547): DISPLAY 0:8:132
10-09 23:28:17.083: D/ClockView(16547): ELAPSED TIME 1968
10-09 23:28:17.083: D/ClockView(16547): DISPLAY 0:8:32
10-09 23:28:17.123: D/ClockView(16547): PAUSE PRESSED
10-09 23:28:21.348: D/ClockView(16547): PAUSE PRESSED
10-09 23:28:21.348: D/ClockView(16547): ELAPSED TIME 2010
10-09 23:28:21.348: D/ClockView(16547): DISPLAY 0:7:990
10-09 23:28:21.448: D/ClockView(16547): ELAPSED TIME 2110
10-09 23:28:21.448: D/ClockView(16547): DISPLAY 0:7:890
代码:
public class ClockCallable implements Callable<Long> {
private long startTime = SystemClock.elapsedRealtime();
private long elapsedTime = 0;
private long pausedStartTime = 0;
private long pausedTime = 0;
Object o = new Object();
private volatile boolean paused = false;
public void pause() {
paused = true;
synchronized(o) {
pausedStartTime = SystemClock.elapsedRealtime();
}
}
public void resume() {
paused = false;
synchronized(o) {
pausedTime = SystemClock.elapsedRealtime() - pausedStartTime;
startTime += pausedTime;
o.notifyAll();
}
}
public void reset() {
paused = false;
synchronized(o) {
clockCallable.startTime = SystemClock.elapsedRealtime();
clockCallable.elapsedTime = 0;
clockCallable.pausedStartTime = 0;
clockCallable.pausedTime = 0;
o.notifyAll();
}
}
@Override
public Long call() throws Exception {
try {
while (elapsedTime < maxTime && !Thread.currentThread().isInterrupted()) {
if (!paused) {
elapsedTime = SystemClock.elapsedRealtime() - startTime;
Log.d(TAG, "ELAPSED TIME " + elapsedTime);
handler.post(new Runnable() { //To post to UI thread
@Override
public void run() {
synchronized(o) {
updateTextView(elapsedTime);
}
}
});
Thread.sleep(100); //Prevent too much work on its main thread
if (Thread.currentThread().isInterrupted()) {
return (long) -1; //For future.cancel() handling
}
}
else {
try {
while(paused) {
synchronized(o) {
o.wait();
}
}
}
catch (InterruptedException e) {}
}
}
}
catch (InterruptedException e) {
e.printStackTrace();
return (long) -1; //For future.cancel() handling
}
return (long) 1;
}
}