Facebook登录按钮点击失败，当Facebook应用程序未安装时。

Question

如果设备上安装了Facebook应用程序，我的Facebook登录按钮可以正常使用。

当设备上没有安装Facebook应用程序时，它会导致我的应用程序崩溃：

E/AndroidRuntime: FATAL EXCEPTION: main                                                                 
java.lang.NoClassDefFoundError: Failed resolution of: 
Landroid/support/customtabs/CustomTabsIntent$Builder;
at com.facebook.internal.CustomTab.openCustomTab(CustomTab.java:47)
at com.facebook.CustomTabMainActivity.onCreate(CustomTabMainActivity.java:67)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.customtabs.CustomTabsIntent$Builder" on path: DexPathList[[zip file "/data/app/com.testapp-2/base.apk"],nativeLibraryDirectories=[/data/app/com.testapp-2/lib/arm, /data/app/com.testapp-2/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at com.facebook.internal.CustomTab.openCustomTab(CustomTab.java:47) 
at com.facebook.CustomTabMainActivity.onCreate(CustomTabMainActivity.java:67) 
at android.app.Activity.performCreate(Activity.java:6251) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Suppressed: java.lang.ClassNotFoundException: android.support.customtabs.CustomTabsIntent$Builder
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 15 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

清单文件：

<activity
    android:name="com.facebook.CustomTabActivity"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="@string/fb_login_protocol_scheme" />
    </intent-filter>
</activity>

确保fb_login_protocol_scheme的值以"fb"开头。

Gradle依赖项：

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:25.3.0'
    compile 'com.android.support:design:25.3.0'
    compile 'com.google.firebase:firebase-core:10.2.1'
    compile 'com.google.firebase:firebase-database:10.2.1'
    compile 'com.google.firebase:firebase-ads:10.2.1'
    compile ('com.facebook.android:facebook-android-sdk:4.20.0') // app invites
    {
        exclude group: 'com.android.support'
    }
    compile 'com.facebook.android:audience-network-sdk:4.20.0'
    compile "com.android.support:cardview-v7:25.3.0"
    testCompile 'junit:junit:4.12'
}

我该如何解决这个问题？

- Maor Cohen

Answer 1

您正在从 Facebook 依赖项中排除 'com.android.support'。我认为这是因为它未包含与您相同版本的支持库（Facebook SDK 4.20.0 使用 android:support:25.0.0，但您包括了支持库 25.3.0，因此排除它是正确的做法）。

但是，如果您想要 CustomTab 功能正常工作，因此必须在应用程序依赖项中包含适当的依赖关系，因此请添加以下行：

compile 'com.android.support:customtabs:25.3.0'

它应该可以工作。

- PhilippeAuriach

Answer 2

添加这两个依赖项：

implementation('com.facebook.android:facebook-login:[4,5)') {
        exclude group: 'com.android.support'
    }

implementation 'com.android.support:customtabs:25.3.0'

- Krishna Mandal

Answer 3

在 build.gradle 中添加此依赖项。

implementation 'com.android.support:customtabs:28.0.0'

- Sajid Zeb