小编Dan*_*evi的帖子

我的Android应用程序需要一些帮助.我开始使用谷歌firebase和我的应用程序每次在启动器活动时崩溃,我从firebase对象得到null,请帮忙!

错误:

    E/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.workthree.todo, PID: 4011
              java.lang.NullPointerException: Attempt to invoke interface method 'void com.google.firebase.auth.FirebaseAuth$AuthStateListener.onAuthStateChanged(com.google.firebase.auth.FirebaseAuth)' on a null object reference
                  at com.google.firebase.auth.FirebaseAuth$1.run(Unknown Source)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6119)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

代码SplashScreen.java(启动器活动)

public class SplashScreen extends AppCompatActivity {

private final static String TAG = SplashScreen.class.getSimpleName();
private static final String  USER_IS_LOGIN= "UserIsLogin";
private static final String  UI_ID_FIREBASE= "UiIdFirebase";
// Duration of wait
private final int SPLASH_DISPLAY_LENGTH = 2000;

private FirebaseAuth.AuthStateListener mAuthListener; …