java - 为什么 Android Facebook 集成崩溃？

Question

我正在尝试将 Android 应用程序与 facebook 集成。我正在关注这些教程: https://developers.facebook.com/docs/android/getting-started

http://code.tutsplus.com/tutorials/quick-tip-add-facebook-login-to-your-android-app--cms-23837

但是我面临以下问题:

01-05 12:52:45.325 463-463/socialmediaintegration.arifhasnat.com.facebooklogin E/AndroidRuntime: FATAL EXCEPTION: main
Process: socialmediaintegration.arifhasnat.com.facebooklogin, PID: 463
java.lang.ExceptionInInitializerError
    at java.lang.reflect.Constructor.constructNative(Native Method)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at android.view.LayoutInflater.createView(LayoutInflater.java:594)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
    at android.view.LayoutInflater.parseInclude(LayoutInflater.java:839)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:745)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
    at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
    at socialmediaintegration.arifhasnat.com.facebooklogin.MainActivity.onCreate(MainActivity.java:24)
    at android.app.Activity.performCreate(Activity.java:5293)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
    at android.app.ActivityThread.access$800(ActivityThread.java:151)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
    at android.os.Handler.dispatchMessage(Handler.java:110)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:5299)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
    at dalvik.system.NativeStart.main(Native Method)
 Caused by: null
    at com.facebook.internal.Validate.sdkInitialized(Validate.java:99)
    at com.facebook.FacebookSdk.getCallbackRequestCodeOffset(FacebookSdk.java:735)
    at com.facebook.internal.CallbackManagerImpl$RequestCodeOffset.toRequestCode(CallbackManagerImpl.java:109)
    at com.facebook.login.widget.LoginButton.<clinit>(LoginButton.java:58)
    at java.lang.reflect.Constructor.constructNative(Native Method) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
    at android.view.LayoutInflater.createView(LayoutInflater.java:594) 
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696) 
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
    at android.view.LayoutInflater.parseInclude(LayoutInflater.java:839) 
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:745) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
    at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256) 
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109) 
    at socialmediaintegration.arifhasnat.com.facebooklogin.MainActivity.onCreate(MainActivity.java:24) 
    at android.app.Activity.performCreate(Activity.java:5293) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
    at android.app.ActivityThread.access$800(ActivityThread.java:151) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) 
    at android.os.Handler.dispatchMessage(Handler.java:110) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:5299) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646) 
    at dalvik.system.NativeStart.main(Native Method) 

这是我的代码:MainActivity.java

package socialmediaintegration.arifhasnat.com.facebooklogin;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.widget.TextView;

import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;

public class MainActivity extends AppCompatActivity {
    private TextView info;
    private LoginButton loginButton;
    private CallbackManager callbackManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FacebookSdk.sdkInitialize(getApplicationContext());
        callbackManager = CallbackManager.Factory.create();

        info = (TextView)findViewById(R.id.info);
        loginButton = (LoginButton)findViewById(R.id.login_button);

        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {

                info.setText(
                        "User ID: "
                                + loginResult.getAccessToken().getUserId()
                                + "\n" +
                                "Auth Token: "
                                + loginResult.getAccessToken().getToken()
                );


            }

            @Override
            public void onCancel() {
                info.setText("Login attempt canceled.");

            }

            @Override
            public void onError(FacebookException e) {
                info.setText("Login attempt failed.");

            }
        });




    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        callbackManager.onActivityResult(requestCode, resultCode, data);
    }


}

menifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="socialmediaintegration.arifhasnat.com.facebooklogin" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <uses-permission android:name="android.permission.INTERNET"/>

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar" >
            <meta-data android:name="com.facebook.sdk.ApplicationId"
                android:value="@string/facebook_app_id"/>
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <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" />
        <provider android:authorities="com.facebook.app.FacebookContentProvider1234"
            android:name="com.facebook.FacebookContentProvider"
            android:exported="true" />

    </application>

</manifest>

布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:padding="16dp"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/info"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:textSize="18sp"
        />

    <com.facebook.login.widget.LoginButton
        android:id="@+id/login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        />

</RelativeLayout>

和 gradle 依赖项:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "socialmediaintegration.arifhasnat.com.facebooklogin"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

repositories {
    mavenCentral()
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.facebook.android:facebook-android-sdk:4.0.0'
}

Answer 1

我怀疑问题是您初始化 SDK 太晚了。从您链接到的教程中:

// Initialize the SDK before executing any other operations,
// especially, if you're using Facebook UI elements.

该异常似乎是在对 setContentView 的调用中引发的，该异常发生在代码中的 sdkInitialize 调用之前:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    FacebookSdk.sdkInitialize(getApplicationContext());
    ...
}

尝试将其更改为:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    ...
}