app/src/main/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.rivoreo.adialog" >

	<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
	<!--<uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />-->

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name" >
        <activity
          android:name=".MainActivity"
          android:label="@string/app_name"
	  android:theme="@android:style/Theme.Dialog">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
        </activity>
<!--
        <activity
            android:name=".MessageBox"
	    android:theme="@android:style/Theme.Dialog">
        </activity>
-->
        <receiver
            android:name=".RequestReceiver"
            android:enabled="true"
            android:exported="false" >
        </receiver>
    </application>

</manifest>