小编Asa*_*Ali的帖子

当我使用微调器下拉列表或setOnItemSelectedListener发生错误时:

nav_login.xml:

<Spinner
    android:layout_width="20dp"
    android:layout_height="12dp"
    android:id="@+id/spinner"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="false"
    android:layout_alignParentTop="false"
    android:layout_alignWithParentIfMissing="false"
    android:layout_marginRight="30dp"
    android:layout_marginBottom="12dp"
    android:entries="@array/items" />

strinarray:

<string-array name="items">
    <item>Log Out</item>
    <item>Setting</item>
</string-array>

主要活动:

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    Firebase.setAndroidContext(this);
    Firebase rootRef = new Firebase("https://intense-heat-4844.firebaseio.com/property");

    navigationView = (NavigationView) findViewById(R.id.nav_view);
    View mLoginButton = navigationView.inflateHeaderView(R.layout.nav_header);
    mLoginButton.findViewById(R.id.Login);
    if (!myBooleanVariable) {
        mLoginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Calling activity LoginRegister
                Intent intent = new Intent(getApplication(), LoginRegister.class);
                startActivity(intent);
            }
        });
    }

    Intent intent = getIntent();
    if (null …