[Unity]向きを指定したAndroidManifest.xmlの書き方がわからない

Question

1. 実現したいこと

Andoroid6でアプリが強制終了するので、直したい。

1.今回したいこと
AndroidManifestに向きを指定する箇所を書き加えたところ解消された例があるようなので、試したい。

2.試したこと
Assets/Plugin/AndoridにAndroidManifest.xmlを作成し、以下の通りに記述した

<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.unity3d.project">
    <application>
        <activity
            android:screenOrientation="portrait">
        </activity>
    </application>
</manifest>

3.エラーメッセージ

E:\project\Temp\gradleOut\src\main\AndroidManifest.xml Error:
	Validation failed, exiting

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':processReleaseManifest'.
> Manifest merger failed with multiple errors, see logs

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 8s
]
stdout[
:checkReleaseClasspath UP-TO-DATE
:preBuild UP-TO-DATE
:GoogleMobileAdsPlugin:preBuild UP-TO-DATE
:GoogleMobileAdsPlugin:preReleaseBuild UP-TO-DATE
:GoogleMobileAdsPlugin:checkReleaseManifest
:GoogleMobileAdsPlugin:processReleaseManifest
:preReleaseBuild
:GoogleMobileAdsPlugin:compileReleaseAidl NO-SOURCE
:compileReleaseAidl NO-SOURCE
:GoogleMobileAdsPlugin:packageReleaseRenderscript NO-SOURCE
:compileReleaseRenderscript
:checkReleaseManifest
:generateReleaseBuildConfig
:prepareLintJar
:mainApkListPersistenceRelease
:generateReleaseResValues
:generateReleaseResources
:GoogleMobileAdsPlugin:compileReleaseRenderscript
:GoogleMobileAdsPlugin:generateReleaseResValues
:GoogleMobileAdsPlugin:generateReleaseResources
:GoogleMobileAdsPlugin:packageReleaseResources
:mergeReleaseResources
:createReleaseCompatibleScreenManifests
:processReleaseManifest

See http://g.co/androidstudio/manifest-merger for more information about the manifest merger.

:processReleaseManifest FAILED
16 actionable tasks: 15 executed, 1 up-to-date
]
exit code: 1
UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEditor.Android.Command.Run (System.String command, System.String args, System.String workingdir, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action`1[T] progress, System.String error) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1[T] progress) (at <df7ba4d130594d168eec372b930522d4>:0)
Rethrow as GradleInvokationException: Gradle build failed
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1[T] progress) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <df7ba4d130594d168eec372b930522d4>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

3.参考にしたサイト
http://nakamura001.hatenablog.com/entry/20160203/1454459100

よろしくお願いします。

Answer 1

参考にされたサイトの通りに行くと以下のようになるものと考えます。

    <application
		android:theme="@style/UnityThemeSelector"
		android:icon="@drawable/app_icon"
        android:label="@string/app_name">
        <activity android:name="com.unity3d.player.UnityPlayerActivity"
                  android:screenOrientation="portrait"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
        </activity>
    </application>

meta-dataは不要かもしれませんが、他は全て必要なのでは？と考えます。
特に、「android:name="com.unity3d.player.UnityPlayerActivity"」は縦表示に固定したいActivityの名前になるので重要です。

Unityは使ったことがなく、一般的なAndroidアプリのmanifestからの考えしか分かりませんが。。