1.在values下colors中设置透明颜色
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="transparent">#64000000</color>
</resources>
2.在style中引入该color
</style>
<style name="Transparent">
<item name="android:windowBackground">@color/transparent</item>
<item name="android:windowIsTranslucent">true</item>
</style>
3.在清单文件中对应的Activity中添加该样式的主题
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SecondActivity" android:theme="@style/Transparent"> </activity>
</application>