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This is a paid asset, but now you can download Android Etcetera Plugin Free.
Android Etcetera Plugin v3.9
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Now with support for Android M permissions! The Android Etcetera Plugin makes adding an assortment of native Android features a snap. The plugin includes a pile of goodies: local notifications, video playback and recording, access to Android Toasts, Alerts, prompts (alerts with embedded text boxes which are great for getting some text from a user), progress indicator dialog, address book web view, email composer, SMS composer, access to images from the users camera or photo library and a ton more. It is chock full of goodies that are guaranteed to save every Unity developer a heap of time!