首先,我想为我的糟糕英语道歉。
这是我的问题:
我有一个在Android上运行的服务,当活动正在运行时,它在后台运行(此服务使用指定的时间间隔将用户数据与服务器同步)。
public class CService extends Service
{
private Boolean isDestroyed;
@Override
public int onStartCommand (Intent intent, int flags, int startId)
{
if (intent != null)
{
new Thread(new Runnable()
{
//run new thread to disable flush memory for android and destroy this service
@Override
public void run ()
{
this.isDestroyed = Boolean.FALSE
while(!this.isDestroyed)
{
//loop until service isn't destroyed
}
}
}).start();
}
return Service.START_NOT_STICKY;
}
@Override
public void onDestroy ()
{
//THIS ISNT CALLED FROM uncaughtException IN ACTIVITY BUT from onDestroy method is this called.
//when is service destroyed then onDestroy is called and loop finish
this.isDestroyed = Boolean.TRUE;
}
}
这个功能从onCreate方法中开始执行,该活动实现了Thread.UncaughtExceptionHandler并在onCreate方法中注册以捕获活动中的所有意外异常。当活动中的某些内容抛出异常时,uncaughtException方法被调用,并且服务应该使用stopService(serviceIntent)停止。但是,在服务中没有调用onDestoy。但是,当用户按下后退按钮并调用活动中的onDestroy方法时,服务成功停止并调用CService中的onDestoroy。
public class CActivity extends Activity implements Thread.UncaughtExceptionHandler
{
private Thread.UncaughtExceptionHandler defaultUEH;
@Override
protected void onCreate (Bundle savedInstanceState)
{
this.defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
// create intent for service
Intent serviceIntent = new Intent(this, CService.class);
// run service
startService(serviceIntent);
//set default handler when application crash
Thread.setDefaultUncaughtExceptionHandler(this);
super.onCreate(savedInstanceState);
}
@Override
public void uncaughtException (Thread thread, Throwable ex)
{
//THIS DOESN'T WORK
//when global exception in activity is throws then this method is called.
Intent serviceIntent = new Intent(this, CService.class);
//method to service stop is called. BUT THIS METHOD DON'T CALL onDestroy in CService
stopService(serviceIntent);
defaultUEH.uncaughtException(thread, ex);
}
@Override
public void onDestroy ()
{
//this work fine
Intent serviceIntent = new Intent(this, CService.class);
stopService(serviceIntent);
super.onDestroy();
}
}
我需要在活动崩溃时停止后台服务。因为当Android关闭活动并在堆栈中启动先前的活动(即登录屏幕)时,没有用户登录。
谢谢您的建议。