启动白屏 解决方案

给activity设置<item name="android:windowIsTranslucent">true</item>的style

        <activity
            android:name=".activity.WelcomeActivity"
            android:screenOrientation="portrait"
            android:theme="@style/AppTheme.NoActionBar.FullScreen.Translucent">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

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

    <style name="AppTheme.FullScreen.Translucent">
        <item name="android:windowIsTranslucent">true</item>
    </style>