Translucent - Activity 반투명 테마

Activity 가 실행될때 기존에 있던 Activity 를 반투명한 배경으로 보여준다.

        <activity android:name=".app.TranslucentActivity"
                android:label="@string/activity_translucent"
                android:theme="@style/Theme.Translucent">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.SAMPLE_CODE" />
            </intent-filter>
        </activity>

= Styles.xml
   <style name="Theme.Translucent" parent="android:style/Theme.Translucent">
        <item name="android:windowBackground">@drawable/translucent_background</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:colorForeground">#fff</item>
    </style>