App - Activity - Translucent

Translucent

わかりにくいけど、テーマを使って背景は透けています。

Java

普通

    protected void onCreate(Bundle savedInstanceState) {
        // Be sure to call the super class.
        super.onCreate(savedInstanceState);

        // See assets/res/any/layout/translucent_background.xml for this
        // view layout definition, which is being set here as
        // the content of our screen.
        setContentView(R.layout.translucent_background);
    }

Layout

AndroidManifest.xml - テーマの指定
        <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 - 背景色指定
    <!-- A theme that has a translucent background.  Here we explicitly specify
         that this theme is to inherit from the system's translucent theme,
         which sets up various attributes correctly.. -->
    <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>

ほんの少し透明
colors.xml
<drawable name="translucent_background">#e0000000</drawable>

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