java-applicationId不能为null,但xml语法正确

概述我正在尝试将Facebook添加到已经完成的LibGDX游戏中.但是,当我尝试检查当前Session时,它返回null.我试图建立一个新的会话来代替,但出现了空指针错误：01-0419:49:15.433:E/AndroidRuntime(16540):FATALEXCEPTION:main01-0419:49:15.433:E/AndroidRuntime(16540):java.lan

我正在尝试将Facebook添加到已经完成的libGDX游戏中.但是,当我尝试检查当前Session时,它返回null.我试图建立一个新的会话来代替,但出现了空指针错误：

01-04 19:49:15.433: E/AndroIDRuntime(16540): FATAL EXCEPTION: main01-04 19:49:15.433: E/AndroIDRuntime(16540): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pressx.thedevice/com.pressx.thedevice.MainActivity}: java.lang.NullPointerException: Argument 'applicationID' cannot be null01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2070)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2095)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.ActivityThread.access0(ActivityThread.java:135)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.os.Handler.dispatchMessage(Handler.java:99)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.os.Looper.loop(Looper.java:137)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.ActivityThread.main(ActivityThread.java:4849)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at java.lang.reflect.Method.invokeNative(Native Method)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at java.lang.reflect.Method.invoke(Method.java:511)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:562)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at dalvik.system.NativeStart.main(Native Method)01-04 19:49:15.433: E/AndroIDRuntime(16540): Caused by: java.lang.NullPointerException: Argument 'applicationID' cannot be null01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.facebook.internal.ValIDate.notNull(ValIDate.java:29)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.facebook.Session.<init>(Session.java:227)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.facebook.Session.<init>(Session.java:216)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.facebook.Session$Builder.build(Session.java:1576)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.facebook.Session.openActiveSession(Session.java:888)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.facebook.Session.openActiveSession(Session.java:830)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.pressx.facebook.FacebookAndroID.<init>(FacebookAndroID.java:27)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at com.pressx.thedevice.MainActivity.onCreate(MainActivity.java:17)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.Activity.performCreate(Activity.java:5244)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082)01-04 19:49:15.433: E/AndroIDRuntime(16540):    at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2034)01-04 19:49:15.433: E/AndroIDRuntime(16540):    ... 11 more

如果Facebook从AndroIDManifest.xml检查ApplicationID值,那么正确的语法是什么？我将其作为我的元数据行：

<Meta-data androID:name="com.facebook.sdk.ApplicationID" androID:value="@string/app_ID"/>

以此作为我的值字符串：

<string name="app_ID">###############</string>

当前已满,我的AndroIDManifest.xml如下所示：

<?xml version="1.0" enCoding="utf-8"?><manifest package="com.pressx.thedevice" androID:versionCode="1" androID:versionname="1.0" xmlns:androID="http://schemas.androID.com/apk/res/androID">    <uses-sdk androID:minSdkVersion="11" androID:targetSdkVersion="19" />    <uses-permission androID:name="androID.permission.INTERNET"/>    <application androID:icon="@drawable/ic_launcher" androID:label="@string/app_name" >        <Meta-data androID:name="ApplicationID" androID:value="@string/app_ID"/>        <Meta-data androID:name="com.facebook.sdk.ApplicationID" androID:value="@string/app_ID" />        <activity androID:name="com.facebook.LoginActivity">        </activity>        <activity androID:name=".MainActivity" androID:label="@string/app_name" androID:screenorIEntation="landscape" androID:configChanges="keyboard|keyboardHIDden|orIEntation|screenSize">            <intent-filter>                <action androID:name="androID.intent.action.MAIN" />                <category androID:name="androID.intent.category.LAUNCHER" />            </intent-filter>           </activity>    </application></manifest>

我的完整values.xml看起来像这样：

<?xml version="1.0" enCoding="utf-8"?><resources>    <string name="app_name">The Device</string>    <string name="app_ID">###############</string></resources>

有人对此问题有解决方案吗？您是否需要诸如我的项目设置之类的更多信息？

解决方法:

<Meta-data     androID:name="com.facebook.sdk.ApplicationID"     androID:value="@string/app_ID" />

必须在< application />中声明范围,而不是< activity />范围.将标签移动到活动之外,如下所示：

<application androID:icon="@drawable/ic_launcher" androID:label="@string/app_name" ><!-- Note new location --><Meta-data androID:name="com.facebook.sdk.ApplicationID" androID:value="@string/app_ID" /><Meta-data androID:name="ApplicationID" androID:value="@string/app_ID"/>    <activity androID:name="com.facebook.LoginActivity"></activity>    <activity androID:name=".MainActivity" androID:label="@string/app_name" androID:screenorIEntation="landscape" androID:configChanges="keyboard|keyboardHIDden|orIEntation|screenSize">        <intent-filter>            <action androID:name="androID.intent.action.MAIN" />            <category androID:name="androID.intent.category.LAUNCHER" />        </intent-filter>    </activity></application>

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