Maybe using ASNE library make your life easier?
Just add dependency to your project:
dependencies {
...
compile 'com.github.asne:asne-facebook:0.2.0'
compile 'com.github.asne:asne-twitter:0.2.0'
compile 'com.github.asne:asne-googleplus:0.2.0'
compile 'com.github.asne:asne-linkedin:0.2.0'
...
}
setup and request almost anything!