Android Studio Suddenly started to display unable to resolve com.android.support...25.0.0 error messages and all of my java files are erroneous now?

android android-gradle-plugin android-support-library android-api-levels

Open your android SDK manager (from C:\Users\youruseraccount\AppData\Local\Android\sdk) and update following to latest versions in,

Tools section section

Android 7.1.1 (API 25) section

Extras Section

Then update your gradle file accordingly.

android android-gradle-plugin android-support-library android-api-levels

Facebook updated their SDK to use the latest support libraries. You could replace

compile 'com.facebook.android:facebook-android-sdk:[4,5)'

with

compile 'com.facebook.android:facebook-android-sdk:4.16.1'

if you do not want to update your android sdk just yet.

android android-gradle-plugin android-support-library android-api-levels

I had the same problem earlier today. Out of nowhere, I started having those weird error messages. Updating:

did the trick for me. Just go to Tools > Android > SDK Manager in your Android Studio then find and update them. Good luck!

CodeHunter