黃色報錯提示：

App is not indexable by Google Search; consider adding at least one Activity with an ACTION-VIEW intent filter. See issue explanation for more details. less... (Ctrl+F1) 

解決方法：在<intent-filter>標籤下新增：<action android:name="android.intent.action.VIEW"/>

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