[英]How do I join the thread to stop it?
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mProgressBar = (ProgressBar)findViewById(R.id.adprogress_progressBar);
final Thread timerThread = new Thread() {
private volatile boolean running = true;
public void terminate() {
running = false;
}
@Override
public void run() {
while(running) {
mbActive = true;
try {
int waited = 0;
while(mbActive && (waited < TIMER_RUNTIME)) {
sleep(200);
if(mbActive) {
waited += 200;
updateProgress(waited);
}
}
} catch(InterruptedException e) {
running=false;
}
}
}
};
timerThread.start();
}
public void onLocationChanged(Location location) {
if (location != null) {
TextView text;
text = (TextView) findViewById(R.id.t2);
String str= "Latitude is " + location.getLatitude() + "\nLongitude is " + location.getLongitude();
text.setText(str);
text.postInvalidate();
}
}
How would I stop the thread in onCreate from onLocationChanged? 如何从onLocationChanged停止onCreate中的线程? I need to stop the progressbar once the GPS provides the coordinates. GPS提供坐标后,我需要停止进度栏。 I need to join the threads using join(). 我需要使用join()加入线程。 Solution will be helpful. 解决方案将有所帮助。
使timerThread为类成员,而不是语言环境变量,通过这种方式,您应该从onLocationChanged方法访问它
改用AsyncTask,存储Future并自己停止线程。
If this is not a home work assignment, then I see no need to join()
. 如果这不是家庭作业,那么我看不到join()
。 Even more so when you're trying to join the UI thread with an arbitrary thread, effectively casuing an ANR . 更重要的是,当您尝试将UI线程与任意线程连接时,会有效地引起ANR 。
Either: 要么:
Create you own class extending Thread
, implement your terminate()
method, and then call it whenever you want. 创建您自己的扩展Thread
的类,实现您的terminate()
方法,然后在需要时调用它。
Create your own class extending AsyncTask , implementing LocationListener, and use its onProgressUpdate() method. 创建扩展AsyncTask的自己的类,实现LocationListener,并使用其onProgressUpdate()方法。
You can simply declare in your Activity a member : 您只需在Activity中声明一个成员:
private Thread mTimerThread = null;
then in your onCreate() replace : 然后在您的onCreate()中替换:
final Thread timerThread = new Thread() {
with 与
mTimerThread = new Thread() {
and in onLocationChanged : 并在onLocationChanged中:
if (mTimerThread != null && mTimerThread.isAlive()) {
mTimerThread.terminate();
}
to achieve what you want. 实现您想要的。
However, as others mentioned, I would also recommend using custom AsyncTask
as it would be most clear way of threading in your case. 但是,正如其他人提到的那样,我也建议您使用自定义AsyncTask
因为这将是您情况下最清晰的线程处理方式。
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