[英]Facebook SDK Android Login Button error
我是Android应用程序开发的新手,正在尝试使用Facebook登录按钮创建简单的活动。 但是,在手机上部署应用程序时,出现以下错误:
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #5
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: Process: com.example.fblogin, PID: 24890
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:746)
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:774)
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at com.facebook.internal.Utility.queryAppSettings(Utility.java:822)
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at com.facebook.login.widget.LoginButton$1.run(LoginButton.java:489)
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
11-09 04:48:44.260 24890-25085/com.example.fblogin E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
我编写了以下.xml和.java代码:
JAVA:
public class LoginActivity extends AppCompatActivity {
private LoginButton loginButton;
private CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
setContentView(R.layout.activity_login);
loginButton = (LoginButton)findViewById(R.id.fb_login_button);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException e) {
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
callbackManager.onActivityResult(requestCode, resultCode, data);
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:facebook="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
android:padding="20dp" >
<com.facebook.login.widget.LoginButton
android:id="@+id/fb_login_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
/>
我还在AndroidManifest.xml中添加了标签。 非常感谢您提供有关如何使FB登录功能正常工作的任何帮助。 Facebook文档的感觉很难解释。
尝试向您的登录按钮添加权限(在注册回调之前),例如:
loginButton.setReadPermissions(“ public_profile”);
在您的onActivityResult内部尝试添加
super.onActivityResult(requestCode,resultCode,data);
在callbackManager.onActivityResult方法之前
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