Namespace Android Classes Manifest https://developer.android.com/reference/android/Manifest.html Manifest.permission https://developer.android.com/reference/android/Manifest.permission.html Manifest.permission_group https://developer.android.com/reference/android/Manifest.permission_group.html R https://developer.android.com/reference/android/R.html R.anim https://developer.android.com/reference/android/R.anim.html R.animator https://developer.android.com/reference/android/R.animator.html R.array https://developer.android.com/reference/android/R.array.html R.attr https://developer.android.com/reference/android/R.attr.html R.boolClass https://developer.android.com/reference/android/R.bool.html R.color https://developer.android.com/reference/android/R.color.html R.dimen https://developer.android.com/reference/android/R.dimen.html R.drawable https://developer.android.com/reference/android/R.drawable.html R.fraction https://developer.android.com/reference/android/R.fraction.html R.id https://developer.android.com/reference/android/R.id.html R.integer https://developer.android.com/reference/android/R.integer.html R.interpolator https://developer.android.com/reference/android/R.interpolator.html R.layout https://developer.android.com/reference/android/R.layout.html R.menu https://developer.android.com/reference/android/R.menu.html R.mipmap https://developer.android.com/reference/android/R.mipmap.html R.plurals https://developer.android.com/reference/android/R.plurals.html R.raw https://developer.android.com/reference/android/R.raw.html R.stringClass https://developer.android.com/reference/android/R.string.html R.style https://developer.android.com/reference/android/R.style.html R.transition https://developer.android.com/reference/android/R.transition.html R.xml https://developer.android.com/reference/android/R.xml.html