Question

我一直在努力让facebook练习应用程序正常工作，我不能为我的生活弄清楚为什么我不能引用Facebook SDK中的LoginButton。下面是我在查看定义LoginButton的布局时遇到的错误。

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

The following classes could not be instantiated:
- com.facebook.widget.LoginButton (Open Class, Show Error Log)
See the Error Log (Window > Show View) for more details.
Tip: Use View.isInEditMode() in your custom views to skip code when shown in Eclipse

android.content.res.Resources$NotFoundException: Could not resolve resource value:            0x7F070004.
at android.content.res.BridgeResources.throwException(BridgeResources.java:693)
at android.content.res.BridgeResources.getColor(BridgeResources.java:185)
at com.facebook.widget.LoginButton.<init>(LoginButton.java:211)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(    at      sun.reflect.NativeConstructorAccessorImpl.newInstance(    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(    at java.lang.reflect.Constructor.newInstance(    at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:422)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:179)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:746)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)

Answer 1

选项＃1：

有时，当添加新资源时，Eclipse无法正确编译新代码（可能是缓存问题），从而导致此错误。

通常，只需重新启动Eclipse即可解决问题。

选项＃2：

有时，渲染自定义视图会导致此异常。我知道的唯一解决方法是每次尝试使用getResources()时都要检查View.isInEditMode。

一个例子可能是：

if (isInEditMode()) {
    //do something else, as getResources() is not valid.
} else {
    //you can use getResources()
    String mystring = getResources().getString(R.string.mystring);
}

Answer 2

//先写这个

FacebookSdk.sdkInitialize（getApplicationContext（））;

//然后设置contentview

    setContentView(R.layout.activity_main);

Answer 3

如果你使用的是android studio，那么这里有明确的文档，

将facebook与片段一起使用 Tutorial

没有片段的用户脸书

步骤1：在包中创建java文件MyApplication.java。

Tutorial

和copu myApplicatyon.java

第2步：设置androidmenufest.xml

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.Myapptheme"
    android:name=".MyApplication"
     >
    <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id" />
    <activity android:name="com.facebook.FacebookActivity"
        android:configChanges=
            "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:theme="@android:style/Theme.Translucent.NoTitleBar"
        android:label="@string/app_name" />

步骤3：在您正在寻找init登录按钮的内部活动

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    callbackManager = CallbackManager.Factory.create();
    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.activity_auth_login);

    //Init Elements
    etEmail = (EditText) findViewById(R.id.etEmail);
    etPassword = (EditText) findViewById(R.id.etPassword);

    validator = new Validator(this);
    validator.setValidationListener(this);

    serverConnection = new ServerConnection();

    //Faceboo login init
    loginButton = (LoginButton) findViewById(R.id.btnFbLogin);
    loginButton.setReadPermissions(Arrays.asList("public_profile","email","user_photos"));



    // Other app specific specialization
    // Callback registration
    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            // App code

            Profile profile = Profile.getCurrentProfile();

            Log.v("profile.getName:",profile.getName());
        }

        @Override
        public void onCancel() {
            // App code
        }

        @Override
        public void onError(FacebookException exception) {
            // App code
        }
    });

}

无法实例化以下类： - com.facebook.widget.LoginButton

3 个答案: