In today's world, if you're communicating with someone from a foreign country through messaging or chat, or if you're learning a foreign language and want to type text directly in that language on your Android device without downloading additional keyboard apps, follow the steps below. You can also check out articles on setting up a Korean keyboard for Android or setting up a Japanese keyboard for Android.
Note: The steps below are demonstrated on a Samsung Android phone. Your device may follow similar steps, but it could vary depending on the ROM version you're using.
Changing Language for Messaging, Typing, and Chat on Android
Step 1: Open the messaging app to compose a message to any contact. Then, tap on the Settings icon as shown in the image. Alternatively, you can go to Settings > Language and Keyboard.
Step 2 : Choose Input Language > It might be defaulting to either Vietnamese or English, check the box next to the language you want to use when needed.
Step 3 : In the list of supported languages, you can find many countries. Scroll down, then tap on the language you want to download. Once downloaded, you can select it as in Step 2.
Step 4 : Back at the keyboard, you can notice a small print (Vietnamese) on the space bar. Press and hold on the space bar, then swipe left or right to switch to another language.
https://Mytour.vn/thay-doi-ngon-ngu-nhan-tin-bo-go-chat-tren-android-2042n.aspx
The instructions above by Mytour have helped you easily change messaging, typing, and chat language on Android without the need to download additional keyboard apps. However, not all languages worldwide are supported here, and the method to change input language may vary depending on the Android phone brands.
