android - 为什么 facebook 登录 fragment 总是在 android 中显示无效的 key 散列？

Question

我正在尝试通过我的 android 应用程序中的 facebook 登录名登录，但它总是给我一个无效的 key 散列。我已经使用 facebook 开发者网站上给出的命令通过 mac 上的终端正确生成了哈希 key ，并且还正确使用了我的 facebook 应用程序 ID。这是我的登录 Activity 类代码:

登录 Activity .java

package com.titmus.worldscope;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.webkit.WebView;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.titmus.worldscope.model.WorldScopeUser;
import com.titmus.worldscope.utility.WorldScopeAPIService;
import com.titmus.worldscope.utility.WorldScopeRestAPI;

import java.security.MessageDigest;

import fragment.FacebookLoginFragment;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class LoginActivity extends AppCompatActivity implements FacebookLoginFragment.OnFragmentInteractionListener {

    private static final String TAG = "LoginActivity";
    private static final String WELCOME_GIF_LINK = "file:///android_asset/welcomeGifAssets/welcome.html";
    private static final String APP_SERVER_AUTH_FAILED_MSG = "Authentication with WorldScope's server has failed, please check that you have internet connections and try again.";
    private static Context context;
    private FacebookLoginFragment facebookLoginFragment;

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

        context = this;

        loadGifIntoWebView();
    }

    @Override
    public void onFacebookLoginSuccess(AccessToken accessToken) {
        // Successful login -> Redirect to Main activity
        Log.d(TAG, "Login Success!");
        Log.d(TAG, "AccessToken: " + accessToken.getToken());

        // Instantiate and make a call to login user into WorldScope servers
        Call<WorldScopeUser> call = new WorldScopeRestAPI(context).buildWorldScopeAPIService().loginUser(new WorldScopeAPIService.LoginUserRequest(accessToken.getToken()));
        call.enqueue(new Callback<WorldScopeUser>() {
            @Override
            public void onResponse(Response<WorldScopeUser> response) {
                if(response.isSuccess()) {
                    Log.d(TAG, "Success!");
                    Log.d(TAG, "" + response.body().toString());

                    WorldScopeUser user = response.body();
                    WorldScopeAPIService.setUser(user);
                    // Redirect to MainActivity if successful
                    redirectToMainActivity();

                } else {
                    Log.d(TAG, "Failure" + response.code() + ": " + response.message());
                    // Logout of Facebook
                    logoutOfFacebook();
                }
            }

            @Override
            public void onFailure(Throwable t) {
                Log.d(TAG, "Failure: " + t.getMessage());
                // Logout of Facebook
                logoutOfFacebook();
            }
        });
    }

    //Redirects to MainActivity
    protected void redirectToMainActivity() {
        Intent intent = new Intent(context, MainActivity.class);
        intent.putExtra("activity", TAG);
        startActivity(intent);
    }

    // Called to logout of Facebook when attempt to authenticate with App server fails
    private void logoutOfFacebook() {

        if(facebookLoginFragment == null) {
            // Get FacebookLoginFragment if missing
            facebookLoginFragment = (FacebookLoginFragment) getSupportFragmentManager().findFragmentById(R.id.facebookLoginButtonFragment);
        }

        // Toast to inform user
        Toast toast = Toast.makeText(context, APP_SERVER_AUTH_FAILED_MSG, Toast.LENGTH_LONG);
        toast.show();
        facebookLoginFragment.logoutFromFacebook();

    }

    // Method to load Gif's html data into WebView
    private void loadGifIntoWebView() {
        WebView welcomeGifWebView = (WebView) findViewById(R.id.welcomeGifWebView);
        welcomeGifWebView.loadUrl(WELCOME_GIF_LINK);
    }
}

activity_facebook_login.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/loginActivity"
    tools:context="com.titmus.worldscope.LoginActivity">

    <WebView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/welcomeGifWebView"
        android:layout_alignParentEnd="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true" />

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/facebookLoginButtonFragment"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="48dp">

        <ImageView
            android:layout_width="32dp"
            android:layout_height="match_parent"
            android:id="@+id/imageView"
            android:src="@drawable/ic_logo"
            android:layout_alignBottom="@+id/textView4"
            android:layout_toStartOf="@+id/textView4"
            android:layout_marginEnd="4dp"
            android:paddingTop="6dp"
            android:paddingBottom="5dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="WorldScope"
            android:id="@+id/textView4"
            android:textColor="#ffffff"
            android:textStyle="bold"
            android:textSize="32sp"
            android:layout_above="@+id/facebookLoginButtonFragment"
            android:layout_centerHorizontal="true" />
    </LinearLayout>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="By logging in you agree to WorldScope&apos;s Privacy Policy and Terms of Use."
        android:id="@+id/textView6"
        android:textColor="#eeeeee"
        android:textSize="14dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:textAlignment="center"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="57dp" />

    <fragment
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:name="fragment.FacebookLoginFragment"
        android:id="@+id/facebookLoginButtonFragment"
        tools:layout="@layout/fragment_facebook_login"
        android:layout_marginBottom="14dp"
        android:layout_above="@+id/textView6"
        android:layout_alignParentStart="true" />

</RelativeLayout>

Answer 1

使用 cmd 生成的 keyhash 第一次工作正常，然后就不行了。

所以使用这个方法在你们任何一个类中生成keyHash

public void printHashKey(){
        // Add code to print out the key hash
        try {
            PackageInfo info = getPackageManager().getPackageInfo(
                    "net.simplifiedcoding.androidlogin",
                    PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
        } catch (PackageManager.NameNotFoundException e) {

        } catch (NoSuchAlgorithmException e) {

        }
    }

然后复制生成的 key 哈希，并将其粘贴到您在 facebook 开发者控制台中通过 cmd 生成的 key 哈希添加的位置。

它会工作，并且不要将应用程序限制在 facebook 开发者控制台中的一台设备上