Android启动APP时黑屏白屏的解决方法

<!--***************启动页Theme***************-->

 <style name="Theme.Splash" parent="Theme.AppCompat.Light.NoActionBar">
  <item name="windowNo ">true</item>
  <item name="android:windowContentOverlay">@null</item>
  <item name="android:windowBackground">@drawable/splash_pic</item>
  <item name="android:windowFullscreen">true</item>
</style>

<activity
   android:name=".ui.SplashActivity"
   android:theme="@style/Theme.Splash"
   android:screenOrientation="portrait">
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
</activity>