AndroidMainfest.xml

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

    <application
        android:allowBackup="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name">

        .........
        <!--facebook-->
        <meta-data
            android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id" />

        <activity
            android:name="com.facebook.FacebookActivity"
            android:screenOrientation="portrait"
            android:configChanges="orientation|keyboardHidden|screenSize"></activity>

        <provider
            android:authorities="com.facebook.app.FacebookContentProvider${facebookAppId}"
            android:name="com.facebook.FacebookContentProvider"
            android:exported="true" >
        </provider>

    </application>

</manifest>

app.gradle

apply plugin: 'com.android.application'

android {
    useLibrary 'org.apache.http.legacy'

    signingConfigs {
        release {
            keyAlias ......
            keyPassword ......
            storePassword ......
            storeFile file(......)
        }
    }
    compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)
    buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION

    defaultConfig {
        applicationId "......."
        minSdkVersion Integer.parseInt(project.ANDROID_BUILD_MIN_SDK_VERSION)
        targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)
        versionCode 0
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        .....
    }
    buildTypes {
        debug {
            ....
            //facebook app id
            buildConfigField "String", "FACEBOOK_APP_ID", "\""+project.STAGING_FACEBOOK_APP_ID+"\""
            resValue "string", "facebook_app_id", project.STAGING_FACEBOOK_APP_ID

            manifestPlaceholders = [facebookAppId: project.STAGING_FACEBOOK_APP_ID]
        }

        release {
            signingConfig signingConfigs.release            

            //facebook app id
            buildConfigField "String", "FACEBOOK_APP_ID", "\""+project.PRODUCTION_FACEBOOK_APP_ID+"\""
            resValue "string", "facebook_app_id", project.PRODUCTION_FACEBOOK_APP_ID

            manifestPlaceholders = [facebookAppId: project.PRODUCTION_FACEBOOK_APP_ID]
        }
    }
    ....
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    compile project.ANDROID_SUPPORT_LIB
    compile 'com.facebook.android:facebook-android-sdk:XXX'

}

gradle.properties

# Project-wide Gradle settings.

# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.

# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html

# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
org.gradle.jvmargs=-Xmx1536m

# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true

ANDROID_COMPILE_SDK_VERSION= Google Inc.:Google APIs:23
ANDROID_BUILD_TARGET_SDK_VERSION= 23
ANDROID_BUILD_TOOLS_VERSION= 23.0.1
ANDROID_BUILD_SDK_VERSION= 23
ANDROID_BUILD_MIN_SDK_VERSION= 15

ANDROID_SUPPORT_LIB = com.android.support:appcompat-v7:23.2.1

#Facebook
STAGING_FACEBOOK_APP_ID = <直接填數值>
PRODUCTION_FACEBOOK_APP_ID = <直接填數值>