I would love to have the arrow button, which is used in google translate, in my app. The one used on the right of the textview here:
Take a look in the SDK. The SDK has pretty much all the default icons for Android. You can find it in [ANDROID_SDK_HOME]/platforms/[ANDROID_VERSION]/data/res/
Look in all drawable-xxxx
folders (i.e. drawable-xhdpi, drawable-hdpi, etc...) for the icon
As Egor pointed out, the arrows can be found in the official Android Action Bar Icon Pack. Here are the paths:
Arrow back:
Android Design - Icons 20131120\Action Bar Icons\holo_light\02_navigation_back\
Arrow forward:
Android Design - Icons 20131120\Action Bar Icons\holo_light\02_navigation_forward\
Arrow back:
Android Design - Icons 20131120\Action Bar Icons\holo_dark\02_navigation_back\
Arrow forward:
Android Design - Icons 20131120\Action Bar Icons\holo_dark\02_navigation_forward\
You can download a pack of Android ActionBar icons here, and the forward arrow is there also. Hope this helps.