Issue in resolving nonnull and notnull symbol in looper.java

Question

I\'m developing an android app please help me to solve dependency error.

package android.os;
import android.support.annotation.NonNull;
import android.suppor         


        

Answer 1

Since Google announced at IO17 gradle:3.0, the compile configuration is now deprecated and should be replaced by implementation or api

So prefer

dependencies {
    ...
    implementation 'com.android.support:support-annotations:27.1.1'
    ...
}

or greater version

Answer 2

As of android api 29 ('targetSdkVersion' 29) com.android.support has been moved to 'androidx' library. In your Build.gradle file(app level), dependencies block use...

dependencies{ ...

implementation 'androidx.annotation:annotation:1.1.0' }

And in your .java files use import as follows: import androidx.annotation.NonNull; ...

Again build your project!

Answer 3

Try:

import android.support.annotation.NonNull;

Also add gradle build as other guys already mentioned:

dependencies {
    compile 'com.android.support:support-annotations:+'
}

Answer 4

Add following in your dependencies

compile 'com.android.support:support-annotations:+'

Also, verify this

Go to File -> Setting -> search for "nullable" and verify these settings.

Answer 5

Add following in your dependencies

dependencies {
    compile 'com.android.support:support-annotations:+'
}