Android Studio Showing all Red errors But all the codes are ok?

Question

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Android Studio Showing all Red errors But all the codes seems to be OK? In this image shown AppCompatActivity and all imported files. what should I do now ??

Answer 1

First, clean your project and rebuild again. If your issue is not still not resolved the then open the build.gradle(Module:app) file and try to update your appcompat library using this line:

compile 'com.android.support:appcompat-v7:25.1.1'

version number (25.1.1) is different according to your targetSdkVersion.