added stargazers and other fixes and enhancements

app/src/main/java/org/mian/gitnex/viewmodels/RepoStargazersViewModel.java

@@ -0,0 +1,60 @@
+package org.mian.gitnex.viewmodels;
+
+import android.util.Log;
+import androidx.annotation.NonNull;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+import org.mian.gitnex.clients.RetrofitClient;
+import org.mian.gitnex.models.UserInfo;
+import java.util.List;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+/**
+ * Author M M Arif
+ */
+
+public class RepoStargazersViewModel extends ViewModel {
+
+    private static MutableLiveData<List<UserInfo>> stargazersList;
+
+    public LiveData<List<UserInfo>> getRepoStargazers(String instanceUrl, String token, String repoOwner, String repoName) {
+
+        stargazersList = new MutableLiveData<>();
+        loadRepoStargazers(instanceUrl, token, repoOwner, repoName);
+
+        return stargazersList;
+    }
+
+    public static void loadRepoStargazers(String instanceUrl, String token, String repoOwner, String repoName) {
+
+        Call<List<UserInfo>> call = RetrofitClient
+                .getInstance(instanceUrl)
+                .getApiInterface()
+                .getRepoStargazers(token, repoOwner, repoName);
+
+        call.enqueue(new Callback<List<UserInfo>>() {
+
+            @Override
+            public void onResponse(@NonNull Call<List<UserInfo>> call, @NonNull Response<List<UserInfo>> response) {
+
+                if(response.isSuccessful()) {
+                    if(response.code() == 200) {
+                        stargazersList.postValue(response.body());
+
+                    }
+                }
+
+            }
+
+            @Override
+            public void onFailure(@NonNull Call<List<UserInfo>> call, Throwable t) {
+                Log.i("onFailure", t.toString());
+            }
+
+        });
+
+    }
+}