android Activity透明背景

1.

You could apply a transparent theme to the required activity. Create a new style in /res/values/style.xml

<resources><style name="Transparent"><item name="android:windowIsTranslucent">true</item><item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item><item name ="android:windowBackground">@color/transparent</item><item name="android:windowNoTitle">true</item><item name="android:colorForeground">#fff</item></style></resources>

The value of transparent is

2.

<color name="transparent">#00000000</color>

Now in AndroidManifest.xml declare the theme of the activity to the one you just created.

3.

<activity android:name="MyActivity" android:theme="@style/Transparent"></activity>