这是我的代码:
public class MainActivity extends Activity {
private ComponentName mService;
private Servicio serviceBinder;
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
serviceBinder = ((Servicio.MyBinder)service).getService();
}
public void onServiceDisconnected(ComponentName className) {
serviceBinder = null;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Intent bindIntent = new Intent(this, Servicio.class);
bindService(bindIntent, mConnection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStart() {
serviceBinder.somethingThatTakesTooMuch();
super.onStart();
}
public class Servicio extends Service {
private final IBinder binder = new MyBinder();
@Override
public IBinder onBind(Intent intent) {
return binder;
}
public int somethingThatTakesTooMuch() {
return 1;
}
public class MyBinder extends Binder {
Servicio getService() {
return Servicio.this;
}
}
当我运行它时,
它在这一行中得到一个 NullPointerException:
serviceBinder.somethingThatTakesTooMuch();
Your onStart
在与服务的连接完成之前被调用。这不是即时的。
您只能保证在调用 onServiceConnected 之后服务已连接。然后才能调用serviceBinder上的方法。
尝试打电话serviceBinder.somethingThatTakesTooMuch()
之后上线serviceBinder = ((Servicio.MyBinder)service).getService();
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