The import org.apache.http.client cannot be resolved error when I update sdk to M

For eclipse -- Find library in your sdk and add it manually platforms/android-23/optional/org.apache.http.legacy.jar

For android studio add this line in build.gradle

android {
    useLibrary 'org.apache.http.legacy'
}

apache http and NameValuePair has been deprecated in api 23. youl have to manualy add apache library check this .

or may be you should start using from now HttpURLConnection . check this answer for same

for android studio add one line in build.gradle file of app like:

android {
       compileSdkVersion 23
       ....
       defaultConfig {
       ..
       ..
       }
 useLibrary 'org.apache.http.legacy'
}

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