Java ScheduledExecutorService作为超时显示无警报对话框
我正在尝试在我的应用程序中实现超时行为。在超时实际发生前5秒,还应该有一个警告(alertdialog) 我想使用ScheduledExecutorService来执行此操作 以下是我目前的相关代码:Java ScheduledExecutorService作为超时显示无警报对话框,java,android,timeout,android-alertdialog,scheduledexecutorservice,Java,Android,Timeout,Android Alertdialog,Scheduledexecutorservice,我正在尝试在我的应用程序中实现超时行为。在超时实际发生前5秒,还应该有一个警告(alertdialog) 我想使用ScheduledExecutorService来执行此操作 以下是我目前的相关代码: private final Context context = this; private ScheduledExecutorService sExService = Executors.newScheduledThreadPool(2); private RunnableScheduledF
private final Context context = this;
private ScheduledExecutorService sExService = Executors.newScheduledThreadPool(2);
private RunnableScheduledFuture<?> sFutureTimeout;
private RunnableScheduledFuture<?> sFutureDisconnect;
private final Runnable timeoutRunnable = new Runnable(){
@Override
public void run() {
showTimeoutAlertDialog();
}
};
private final Runnable disconnectRunnable = new Runnable(){
@Override
public void run() {
disconnect();
}
};
private final Context=this;
private ScheduledExecutorService sExService=Executors.newScheduledThreadPool(2);
私有RunnableScheduledFuture sFutureTimeout;
私有可运行的可调度未来sFutureDisconnect;
private final Runnable timeoutRunnable=new Runnable(){
@凌驾
public void run(){
showTimeoutAlertDialog();
}
};
private final Runnable disconnectRunnable=new Runnable(){
@凌驾
公开募捐{
断开连接();
}
};
以及处理超时行为的方法:
private void setTimeout(){
sFutureTimeout = (RunnableScheduledFuture<?>) sExService.schedule(timeoutRunnable, 5, TimeUnit.SECONDS);
}
private void setTimeout(){
sFutureTimeout=(RunnableScheduledFuture)sExService.schedule(timeoutRunnable,5,TimeUnit.SECONDS);
}
setTimeout在onCreate()中调用,因此应用程序应在启动后5秒断开连接
private void showTimeoutAlertDialog(){
new AlertDialog.Builder(context)
.setTitle("Disconnect in 5s")
.setCancelable(false)
.setPositiveButton("Abort",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
sFutureDisconnect.cancel(false);
setTimeout();
}
}).show();
sFutureDisconnect = (RunnableScheduledFuture<?>) sExService.schedule(disconnectRunnable, 5, TimeUnit.SECONDS);
}
private void showTimeoutAlertDialog(){
新建AlertDialog.Builder(上下文)
.setTitle(“断开5s连接”)
.setCancelable(错误)
.setPositiveButton(“中止”,
新建DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface对话框,int-id){
sFutureDisconnect.cancel(假);
setTimeout();
}
}).show();
sFutureDisconnect=(RunnableScheduledFuture)sExService.schedule(disconnectRunnable,5,TimeUnit.SECONDS);
}
以下是我面临的问题:
- 如果在“setTimeout”中调用的runnable设置为“disconnectRunnable”,则运行正常,应用程序在5s后断开连接
- 当我将其设置为“timeoutRunnable”时,不会显示alertDialog+即使在“showTimeoutAlertDialog”中5秒后应调用“disconnectRunnable”,应用程序也不会断开连接
感谢您的帮助:)您试图显示AlertDialog而不是从UI线程,因此它将永远无法工作。方法
showTimeoutAlertDialog()
是从计划线程池中创建的工作线程调用的。您可以使用处理程序
实现以下目的:
public class MyActivity extends Activity {
private final Context context = this;
private static Handler mHandler = new Handler();
private final Runnable timeoutRunnable = new Runnable(){
@Override
public void run() {
showTimeoutAlertDialog();
}
};
private final Runnable disconnectRunnable = new Runnable(){
@Override
public void run() {
disconnect();
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTimeout();
}
private void disconnect() {
Log.e("MyActivity", "Disconnected");
}
private void setTimeout(){
mHandler.postDelayed(timeoutRunnable, 5000);
}
private void showTimeoutAlertDialog(){
new AlertDialog.Builder(context)
.setTitle("Disconnect in 5s")
.setCancelable(false)
.setPositiveButton("Abort",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
mHandler.removeCallbacks(disconnectRunnable);
setTimeout();
}
}).show();
mHandler.postDelayed(disconnectRunnable, 5000);
}
}
非常感谢。我以前试过使用处理器。我不知道。removeCallbacks(r)方法:)还有一个问题:现在线程怎么样?整个超时行为现在都在ui线程上运行,不是吗?如果是,是否有将超时功能保留在单独线程中的解决方法?如果此处将执行长时间运行的作业,则可以在
disconnect()
方法中启动新线程mHandler.postDelayed(…)
不会阻止UI线程,它只会将Runnable放入消息队列,并将其延迟指定的时间。如果需要,还可以从此Runnable启动新线程。