fix crash in AccountListFragment (#1065)

* fix crash in AccountListFragment

* remove unnecessary subscribeOn

app/src/main/java/com/keylesspalace/tusky/fragment/AccountListFragment.kt

@@ -20,6 +20,7 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.lifecycle.Lifecycle
 import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -39,6 +40,10 @@ import com.keylesspalace.tusky.util.ThemeUtils
 import com.keylesspalace.tusky.util.hide
 import com.keylesspalace.tusky.util.show
 import com.keylesspalace.tusky.view.EndlessOnScrollListener
+import com.uber.autodispose.android.lifecycle.AndroidLifecycleScopeProvider.from
+import com.uber.autodispose.autoDisposable
+import io.reactivex.Single
+import io.reactivex.android.schedulers.AndroidSchedulers
 import kotlinx.android.synthetic.main.fragment_account_list.*
 import retrofit2.Call
 import retrofit2.Callback
@@ -46,6 +51,7 @@ import retrofit2.Response
 import java.io.IOException
 import javax.inject.Inject
 
+
 class AccountListFragment : BaseFragment(), AccountActionListener, Injectable {
 
     @Inject
@@ -248,7 +254,7 @@ class AccountListFragment : BaseFragment(), AccountActionListener, Injectable {
         Log.e(TAG, "Failed to $verb account id $accountId.")
     }
 
-    private fun getFetchCallByListType(type: Type, fromId: String?): Call<List<Account>> {
+    private fun getFetchCallByListType(type: Type, fromId: String?): Single<Response<List<Account>>> {
         return when (type) {
             Type.FOLLOWS -> api.accountFollowing(id, fromId)
             Type.FOLLOWERS -> api.accountFollowers(id, fromId)
@@ -270,24 +276,22 @@ class AccountListFragment : BaseFragment(), AccountActionListener, Injectable {
             recyclerView.post { adapter.setBottomLoading(true) }
         }
 
-        val cb = object : Callback<List<Account>> {
-            override fun onResponse(call: Call<List<Account>>, response: Response<List<Account>>) {
-                val accountList = response.body()
-                if (response.isSuccessful && accountList != null) {
-                    val linkHeader = response.headers().get("Link")
-                    onFetchAccountsSuccess(accountList, linkHeader)
-                } else {
-                    onFetchAccountsFailure(Exception(response.message()))
-                }
-            }
+        getFetchCallByListType(type, id)
+                .observeOn(AndroidSchedulers.mainThread())
+                .autoDisposable(from(this, Lifecycle.Event.ON_DESTROY))
+                .subscribe({ response ->
+                    val accountList = response.body()
+
+                    if (response.isSuccessful && accountList != null) {
+                        val linkHeader = response.headers().get("Link")
+                        onFetchAccountsSuccess(accountList, linkHeader)
+                    } else {
+                        onFetchAccountsFailure(Exception(response.message()))
+                    }
+                }, {throwable ->
+                    onFetchAccountsFailure(throwable)
+                })
 
-            override fun onFailure(call: Call<List<Account>>, t: Throwable) {
-                onFetchAccountsFailure(t as Exception)
-            }
-        }
-        val listCall = getFetchCallByListType(type, id)
-        callList.add(listCall)
-        listCall.enqueue(cb)
     }
 
     private fun onFetchAccountsSuccess(accounts: List<Account>, linkHeader: String?) {
@@ -319,13 +323,13 @@ class AccountListFragment : BaseFragment(), AccountActionListener, Injectable {
         }
     }
 
-    private fun onFetchAccountsFailure(exception: Exception) {
+    private fun onFetchAccountsFailure(throwable: Throwable) {
         fetching = false
-        Log.e(TAG, "Fetch failure", exception)
+        Log.e(TAG, "Fetch failure", throwable)
 
         if (adapter.itemCount == 0) {
             messageView.show()
-            if (exception is IOException) {
+            if (throwable is IOException) {
                 messageView.setup(R.drawable.elephant_offline, R.string.error_network) {
                     messageView.hide()
                     this.fetchAccounts(null)

app/src/main/java/com/keylesspalace/tusky/network/MastodonApi.java

@@ -38,6 +38,7 @@ import okhttp3.MultipartBody;
 import okhttp3.RequestBody;
 import okhttp3.ResponseBody;
 import retrofit2.Call;
+import retrofit2.Response;
 import retrofit2.http.DELETE;
 import retrofit2.http.Field;
 import retrofit2.http.FormUrlEncoded;
@@ -139,12 +140,12 @@ public interface MastodonApi {
     Call<StatusContext> statusContext(@Path("id") String statusId);
 
     @GET("api/v1/statuses/{id}/reblogged_by")
-    Call<List<Account>> statusRebloggedBy(
+    Single<Response<List<Account>>> statusRebloggedBy(
             @Path("id") String statusId,
             @Query("max_id") String maxId);
 
     @GET("api/v1/statuses/{id}/favourited_by")
-    Call<List<Account>> statusFavouritedBy(
+    Single<Response<List<Account>>> statusFavouritedBy(
             @Path("id") String statusId,
             @Query("max_id") String maxId);
 
@@ -223,12 +224,12 @@ public interface MastodonApi {
             @Nullable @Query("pinned") Boolean pinned);
 
     @GET("api/v1/accounts/{id}/followers")
-    Call<List<Account>> accountFollowers(
+    Single<Response<List<Account>>> accountFollowers(
             @Path("id") String accountId,
             @Query("max_id") String maxId);
 
     @GET("api/v1/accounts/{id}/following")
-    Call<List<Account>> accountFollowing(
+    Single<Response<List<Account>>> accountFollowing(
             @Path("id") String accountId,
             @Query("max_id") String maxId);
 
@@ -255,10 +256,10 @@ public interface MastodonApi {
     Call<List<Relationship>> relationships(@Query("id[]") List<String> accountIds);
 
     @GET("api/v1/blocks")
-    Call<List<Account>> blocks(@Query("max_id") String maxId);
+    Single<Response<List<Account>>> blocks(@Query("max_id") String maxId);
 
     @GET("api/v1/mutes")
-    Call<List<Account>> mutes(@Query("max_id") String maxId);
+    Single<Response<List<Account>>> mutes(@Query("max_id") String maxId);
 
     @GET("api/v1/favourites")
     Call<List<Status>> favourites(
@@ -267,7 +268,7 @@ public interface MastodonApi {
             @Query("limit") Integer limit);
 
     @GET("api/v1/follow_requests")
-    Call<List<Account>> followRequests(@Query("max_id") String maxId);
+    Single<Response<List<Account>>> followRequests(@Query("max_id") String maxId);
 
     @POST("api/v1/follow_requests/{id}/authorize")
     Call<Relationship> authorizeFollowRequest(@Path("id") String accountId);