A Dialog view use to show an text inform to user.
If we want a new screen float on current screen like Dialog,
add this line to class declare in AndroidManifest.xml.
android:theme="@android:style/Theme.Holo.Light.Dialog.NoActionBar"
This feature require android:minSdkVersion="11".
New class now look like this.
It too small, we will change layout width to 270dp.
Now it look more professional.
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