This can be done in Bean jelly, but, as far as I know, in the version before that. Since it is built into the Android system, it should be considered an acceptable practice.
From the Android blog:
Bidirectional text support: Android 4.1 helps you attract more users by supporting bidirectional text in TextView and EditText.
Android blog post mentioning this feature
Here you can find out about Creating a Custom Notification Layout "
Gafanha
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