Java 如何停止 Handler Runnable？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/18671067/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to stop Handler Runnable?
提问by user2745636
I am using a handler in the following program and I want to stop it when i=5 but the handler doesn't stop and run continuously.
我在以下程序中使用了一个处理程序，我想在 i=5 时停止它，但处理程序不会停止并连续运行。
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
handler = new Handler();
runnable = new Runnable() {
public void run() {
try {
Toast.makeText(getApplicationContext(), "Handler is working", Toast.LENGTH_LONG).show();
System.out.print("Handler is working");
if(i==5){
//Thread.currentThread().interrupt();
handler.removeCallbacks(runnable);
System.out.print("ok");
Toast.makeText(getApplicationContext(), "ok", Toast.LENGTH_LONG).show();
}
i++;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
handler.postDelayed(this, 5000);
}
};
handler.postDelayed(runnable, 5000);
//return;
}
});
回答by Ahmed Ekri
protected void onStop() {
super.onStop();
handler.removeCallbacks(runnable);
}
you can stop it like this
你可以像这样停止
回答by M-WaJeEh
Because you call postDelayed()again after removing call backs. Please use this code:
因为您postDelayed()在删除回调后再次调用。请使用此代码：
final Handler handler = new Handler();
final Runnable runnable = new Runnable() {
public void run() {
Log.d("Runnable","Handler is working");
if(i == 5){ // just remove call backs
handler.removeCallbacks(this);
Log.d("Runnable","ok");
} else { // post again
i++;
handler.postDelayed(this, 5000);
}
}
};
//now somewhere in a method
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
handler.removeCallbacks(runnable);
handler.postDelayed(runnable, 5000);
}
});
回答by Glenn Pavel
I found a solution which works for me. This is an example of code, where I expect a timer stop, but I saw it was alive, even if I was out of activity:
我找到了一个对我有用的解决方案。这是一个代码示例，我希望计时器停止，但我看到它还活着，即使我没有活动：
boolean bFlagForceExit = false;
Handler timerHandler = new Handler();
private Runnable timerRunnable = new Runnable() {
@Override
public void run() {
if (bFlagForceExit )
MyProcessForExit();
if (bSomeflagForRunAction)
RunProcess();
timerHandler.postDelayed(this, MILISEGUNDOS_ESPERA); }
};
private void MyProcessForExit()
{
timerHandler.removeCallbacks(timerRunnable);
// close activity or whatever
finish();
}
private void RunProcess()
{
// action that i do when tick
// time to leave or stop
bFlagForceExit = true;
}
Then I found that this works if removeCallbacks(timerRunnable)was called for
other threads, so, I solved the problem like this.
然后我发现如果removeCallbacks(timerRunnable)被其他线程调用，这会起作用，所以，我解决了这样的问题。
boolean bFlagForceExit = false;
Handler timerHandler = new Handler();
private Runnable timerRunnable = new Runnable() {
@Override
public void run() {
if (bFlagForceExit )
{
// add a thred for run your stop handler
new Thread(new Runnable() {
public void run() {
SalirDeProceso();
}
}).start();
}
if (bSomeflagForRunAction)
RUnProcess();
timerHandler.postDelayed(this, MILISEGUNDOS_ESPERA); }
};
回答by Zod
Just saw this question. I would use CountDownTimer() instead. Run it for 5 seconds total and every second:
刚看到这个问题。我会改用 CountDownTimer() 。总共运行 5 秒，每秒运行一次：
new CountDownTimer(5000, 1000) {
public void onTick(long milsecRemain) {
// Code to run every second
Log.i("Seconds left", String.valueOf(milsecRemain/1000));
}
public void onFinish() {
// 10 seconds have passed
}
}.start();
