Android Studio 1.1.0 Facebook SDK登录

Question

我尝试用facebook SDK测试登录.

所以我加上compile 'com.facebook.android:facebook-android-sdk:4.0.0'.

然后添加FacebookSdk.sdkInitialize(getApplicationContext()); 到MainActivity.java

但是当我补充说

 <com.facebook.login.widget.LoginButton
    android:id="@+id/login_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="30dp"
    android:layout_marginBottom="30dp" />`

我有以下错误:

Rendering Problems The following classes could not be instantiated:
com.facebook.login.widget.LoginButton (Open Class, Show Exception)
Tip: Use View.isInEditMode() in your custom views to skip code or show sample data when shown in the IDE  
Exception Details java.lang.NoClassDefFoundError: Could not initialize class com.facebook.login.widget.LoginButton
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:806)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:782)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:385) Copy stack to clipboard

Answer 1

您没有发布您的活动代码.但我认为你的代码是这样的:

setContentView(R.layout.my_login_layout);
FacebookSdk.sdkInitialize(getApplicationContext());
mCallbackManager = CallbackManager.Factory.create();

问题是代码的顺序.忽略布局中的"渲染问题",将代码的顺序更改为:

FacebookSdk.sdkInitialize(getApplicationContext());
mCallbackManager = CallbackManager.Factory.create(); // this line doesn't matter 
setContentView(R.layout.my_login_layout);

在OnCreate中使用此代码(...){...}

避免布局渲染问题

如果你想解决渲染问题(布局预览),请查看@ Nathan30答案(见下文).

1. 下载Facebook SDK
2. 将其作为模块导入项目
3. 然后添加<com.facebook.widget.LoginButton .../>到您的布局.