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首先，我试着搜索这个ans并不成功。如果我的问题已经回答了，有人可以请我指出它吗？非常感谢你通过观察这个来帮助我，或者通过掠过这些并指引我朝着正确的方向。我真的很感激！在AlertDialog中启动一个服务并绑定一个外部活动
我的困境：我有一个活动，并在该活动有listview。该列表视图中有多个项目，最需要调用AlertDialog。 AlertDialog调用一个服务，说：“嘿，你需要更新一些数据。”该服务会侦听并成功执行更新。
问题在于我的活动不承认服务。我想知道的是，我并不完全了解服务的运作方式，并且如果您可以将相同的服务启用/运行多次。
请注意，我的示例与The Android Dev Reference for Service上的想法有些类似。
的实施例：
public class MyActivity extends Activity implements IMainActivity
{
ListView _list;
private RefreshConnector _serviceConnector;
private boolean _isBound;
public MyActivity() {}
public fillList()
{
//this won't trigger within the service
}
private void doBindService()
{
// Establish a connection with the service. We use an explicit
// class name because we want a specific service implementation that
// we know will be running in our own process (and thus won't be
// supporting component replacement by other applications).
getApplicationContext().bindService(new Intent(this, UpdateScheduleService.class), _serviceConnector, BIND_AUTO_CREATE);
_isBound= true;
}
private void doUnbindService()
{
if (_isScheduleBound)
{
// Detach our existing connection.
getApplicationContext().unbindService(_serviceConnector);
_isBound= false;
}
}
@Override
protected void onDestroy()
{
super.onDestroy();
doUnbindService();
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
_isBound= false;
_list = (ListView) findViewById(R.id.TheList);
_list.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id)
{
if (view != null)
{
CheckBox selectedFlag = (CheckBox) view.findViewById(R.id.selectedItem);
selectedFlag.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view)
{
doBindService();
Bundle extras = new Bundle();
extras.putBoolean(BundleLocations.BUNDLE_ENABLED, ((CheckBox) view).isChecked());
extras.putLong(BundleLocations.BUNDLE_SCHEDULE_ID, 123); //123 is an example of an id being passed
extras.putString(BundleLocations.ACTION, BundleLocations.ACTION_SELECTED);
Intent updateSelection = new Intent("ChangeItems");
updateSelection.putExtras(extras);
view.getContext().startService(updateSelection);
}
});
TextView description = (TextView) view.findViewById(R.id.description);
description.setText(s.getDescription());
description.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view)
{
doBindService();
ChangeDescriptionDialog dia = new ChangeDescriptionDialog(view.getContext());
dia.setTitle(view.getContext().getResources().getString(R.string.DESCRIPTION_TITLE));
dia.setAction(BundleLocations.ACTION_DESCRIPTION);
dia.setDescription("something new"); //simplified for example...
dia.create();
dia.show();
}
});
}
}
};
}
RefreshConnector：
public class RefreshConnector implements ServiceConnection
{
private UpdateService service;
public IMainActivity getActivity()
{
return activity;
}
public void setActivity(IMainActivity value)
{
this.activity = value;
}
public UpdateScheduleService getService()
{
return service;
}
private IMainActivity activity;
public void onServiceConnected(ComponentName componentName, IBinder iBinder)
{
service = ((UpdateService.UpdateBinder)iBinder).getService();
if(activity != null)
activity.fillList();
}
public void onServiceDisconnected(ComponentName componentName)
{
service = null;
}
}
的UpdateService
public class UpdateService extends Service
{
final public IBinder binder = new UpdateBinder();
@Override
public IBinder onBind(Intent intent)
{
return binder;
}
public class UpdateBinderextends Binder
{
public UpdateService getService()
{
return UpdateService .this;
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
if (intent == null)
{
stopSelf();
return START_STICKY;
}
if(action.equals(BundleLocations.ACTION_SELECTED))
{
long id = intent.getExtras().getLong(BundleLocations.BUNDLE_ID);
boolean enabled = intent.getExtras().getBoolean(BundleLocations.BUNDLE_ENABLED);
if(id < 0)
{
return START_STICKY;
}
String item = intent.getExtras().getString(BundleLocations.BUNDLE_ITEM);
if (item == null || action.equals("")) return START_STICKY;
//do some work with saving the description, which it does
return START_STICKY;
}
return START_STICKY;
}
@Override
public void onDestroy()
{
super.onDestroy();
}
}
DescriptionDialog截断（构造），同时，这是从AlertDialog.Builder类延长。我也有一个在所有基本上存储_context的对话框中常见的类。所以在这里的情况下，上下文保存在超级。 _context受保护...
public ChangeDescriptionDialog(Context context)
{
super(context);
DialogInterface.OnClickListener onClickListenerPositive = new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
//dispatch change
Intent ChangeItems = new Intent("ChangeItems");
Bundle extras = new Bundle();
extras.putParcelable(BundleLocations.BUNDLE_ITEM, _description);
extras.putString(BundleLocations.ACTION, _action);
ChangeItems.putExtras(extras);
//
// my question is partly here
// I start this service...
//
// How would my activity see it... right now it doesn't seem that way even though I do the binding before this call
//
_context.startService(ChangeItems);
}
};
this.setPositiveButton(context.getResources().getString(R.string.DIALOG_POS), onClickListenerPositive);
}
再次注意发生弹出之前发生的绑定。第二，请注意我在绑定中启动服务。我做错了什么或只是没有得到？
再次谢谢大家， 凯利
你的服务更新数据后你想要做什么？ – Noel
嗨诺埃尔，我想有活动刷新数据列表 – KellyTheDev