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[Android] 最初に、表示するActivityを変更する方法

Posted at

app/manifestsフォルダに行く

AndroidManifest.xmlファイルを開く

<application
    android:allowBackup="true"
    android:dataExtractionRules="@xml/data_extraction_rules"
    android:fullBackupContent="@xml/backup_rules"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.HappyBirthday"
    tools:targetApi="31">
    <activity
        android:name=".TaskCompleted"
        android:exported="false"
        android:label="@string/title_activity_task_completed"
        android:theme="@style/Theme.HappyBirthday" />
    <activity
        android:name=".MainActivity"
        android:exported="true"
        android:label="@string/app_name"
        android:theme="@style/Theme.HappyBirthday">
    <!-- ここから下 -->
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    <!-- ここから上 -->
    </activity>
</application>

上記のファイルの下記の部分を、最初に表示させたいactivityのところに、移動させる

<intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

下記のコードのように移動すると、TaskCompleted.ktのactivityが最初に表示されるようになる

<application
    android:allowBackup="true"
    android:dataExtractionRules="@xml/data_extraction_rules"
    android:fullBackupContent="@xml/backup_rules"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.HappyBirthday"
    tools:targetApi="31">
    <activity
        android:name=".TaskCompleted"
        android:exported="true"
        android:label="@string/title_activity_task_completed"
        android:theme="@style/Theme.HappyBirthday">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MainActivity"
        android:exported="true"
        android:label="@string/app_name"
        android:theme="@style/Theme.HappyBirthday" />
</application>
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