feat:graphql basic example added

Author: amanjeetsingh150

GraphQL/README.md

@@ -14,6 +14,6 @@ query {
 </pre>
 The result of the above query is shown below:
 
-Screenshots:
+<b>Screenshots:</b>
 <br><br>
 <img src="graphql.gif"/>

GraphQL/app/src/main/java/com/developers/graphql/MainActivity.kt

@@ -12,6 +12,7 @@ import android.view.View
 import android.widget.TextView
 import com.google.gson.Gson
 import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.disposables.Disposable
 import io.reactivex.schedulers.Schedulers
 import kotlinx.android.synthetic.main.activity_main.*
 import kotlinx.android.synthetic.main.repo_layout.*
@@ -20,6 +21,9 @@ import java.util.logging.Logger
 
 class MainActivity : AppCompatActivity() {
 
+    private lateinit var gitApi: ApiInterface
+    private lateinit var disposable:Disposable
+
     companion object {
         val Log = Logger.getLogger(MainActivity::class.java.name)
     }
@@ -68,8 +72,8 @@ class MainActivity : AppCompatActivity() {
                 progress_bar.visibility = View.GONE
             } else {
 
-                val gitApi = ApiInterface.create()
-                gitApi.getInfo(queryBody)
+                gitApi = ApiInterface.create()
+                disposable = gitApi.getInfo(queryBody)
                         .subscribeOn(Schedulers.io())
                         .observeOn(AndroidSchedulers.mainThread())
                         .subscribe({ result ->
@@ -137,4 +141,11 @@ class MainActivity : AppCompatActivity() {
             }
         })
     }
+
+    override fun onStop() {
+        super.onStop()
+        if(!(disposable.isDisposed)){
+            disposable.dispose()
+        }
+    }
 }