Android App Without Ui: How To Stop Momentary Flash Each Time The App Is Run

I want to create an activity that simply displays a Toast (or speaks a message) then quits. Following the advice in https://www.quora.com/Is-it-possible-to-create-an-Android-app-th

Solution 1:

The answer (thanks to Commonsware) is to insert android:theme="@android:style/Theme.Translucent.NoTitleBar" in the <activity> element in the manifest. The whole amended activity element reads:

    <activity android:name=".MainActivity"
        android:theme="@android:style/Theme.Translucent.NoTitleBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>