For android app develop, which language is the best to learn

Question

i want to be a app develop for smartphone one day, what language should i need to learn for?

Answer 1

Java tutorials -> Android Studio tutorials

or

You can go C++ and use Android NDK

Answer 2

Java is directly use for Android development.

Answer 3

You can use xamarin that using c# to develop.

Answer 4

Java, the answer to Android development is always Java.
maybe HTML5 for hybrid/web apps.
for iOS the answer would be swift.

Answer 5

java and xml

Answer 6

Java is Best for app developer for smartphone.