我们采用透明背景来实现：
1.先在values文件夹下的style中添加一个主题
<!--SplashActivity Theme-->
<style name="SplashTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:windowIsTranslucent">true</item> <!-- 透明背景 -->
<item name="android:windowNoTitle">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowBackground">@color/white</item>
<item name="android:windowFullscreen">true</item>
</style>
2.在清单文件启动页splashActivity设置代码
<activity
android:name=".ui.SplashActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:launchMode="singleTask"
android:screenOrientation="portrait"
android:theme="@style/SplashTheme"
android:windowSoftInputMode="stateHidden|adjustPan">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
ok,大功告成！！！
