Fixed intermittent null pointer exceptions and disabled the light theme temporarily. This closes #21, closes #22, and closes #17.

app/src/main/java/com/keylesspalace/tusky/AccountActivity.java

@@ -160,7 +160,11 @@ public class AccountActivity extends BaseActivity {
         mastodonAPI.account(accountId).enqueue(new Callback<Account>() {
             @Override
             public void onResponse(Call<Account> call, retrofit2.Response<Account> response) {
-                onObtainAccountSuccess(response.body());
+                if (response.isSuccessful()) {
+                    onObtainAccountSuccess(response.body());
+                } else {
+                    onObtainAccountFailure();
+                }
             }
 
             @Override
@@ -238,8 +242,12 @@ public class AccountActivity extends BaseActivity {
         mastodonAPI.relationships(ids).enqueue(new Callback<List<Relationship>>() {
             @Override
             public void onResponse(Call<List<Relationship>> call, retrofit2.Response<List<Relationship>> response) {
-                Relationship relationship = response.body().get(0);
+                if (response.isSuccessful()) {
-                onObtainRelationshipsSuccess(relationship.following, relationship.blocking, relationship.muting);
+                    Relationship relationship = response.body().get(0);
+                    onObtainRelationshipsSuccess(relationship.following, relationship.blocking, relationship.muting);
+                } else {
+                    onObtainRelationshipsFailure(new Exception(response.message()));
+                }
             }
 
             @Override
@@ -326,9 +334,13 @@ public class AccountActivity extends BaseActivity {
         Callback<Relationship> cb = new Callback<Relationship>() {
             @Override
             public void onResponse(Call<Relationship> call, retrofit2.Response<Relationship> response) {
-                following = response.body().following;
+                if (response.isSuccessful()) {
-                // TODO: display message/indicator when "requested" is true (i.e. when the follow is awaiting approval)
+                    following = response.body().following;
-                updateButtons();
+                    // TODO: display message/indicator when "requested" is true (i.e. when the follow is awaiting approval)
+                    updateButtons();
+                } else {
+                    onFollowFailure(id);
+                }
             }
 
             @Override
@@ -366,8 +378,12 @@ public class AccountActivity extends BaseActivity {
         Callback<Relationship> cb = new Callback<Relationship>() {
             @Override
             public void onResponse(Call<Relationship> call, retrofit2.Response<Relationship> response) {
-                blocking = response.body().blocking;
+                if (response.isSuccessful()) {
-                updateButtons();
+                    blocking = response.body().blocking;
+                    updateButtons();
+                } else {
+                    onBlockFailure(id);
+                }
             }
 
             @Override
@@ -405,8 +421,12 @@ public class AccountActivity extends BaseActivity {
         Callback<Relationship> cb = new Callback<Relationship>() {
             @Override
             public void onResponse(Call<Relationship> call, Response<Relationship> response) {
-                muting = response.body().muting;
+                if (response.isSuccessful()) {
-                updateButtons();
+                    muting = response.body().muting;
+                    updateButtons();
+                } else {
+                    onMuteFailure(id);
+                }
             }
 
             @Override

app/src/main/java/com/keylesspalace/tusky/BaseActivity.java

@@ -56,9 +56,12 @@ public class BaseActivity extends AppCompatActivity {
         createMastodonAPI();
         createTuskyAPI();
 
+        /* Note from Andrew March 13, 2017: Keep this and restore it when the light theme is no
+           longer bugged.
         if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("lightTheme", false)) {
             setTheme(R.style.AppTheme_Light);
         }
+        */
     }
 
     @Override

app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java

@@ -653,7 +653,7 @@ public class ComposeActivity extends BaseActivity {
 
     private void sendStatus(String content, String visibility, boolean sensitive,
                             String spoilerText) {
-        ArrayList<String> mediaIds = new ArrayList<String>();
+        ArrayList<String> mediaIds = new ArrayList<>();
 
         for (QueuedMedia item : mediaQueued) {
             mediaIds.add(item.id);
@@ -662,7 +662,11 @@ public class ComposeActivity extends BaseActivity {
         mastodonAPI.createStatus(content, inReplyToId, spoilerText, visibility, sensitive, mediaIds).enqueue(new Callback<Status>() {
             @Override
             public void onResponse(Call<Status> call, retrofit2.Response<Status> response) {
-                onSendSuccess();
+                if (response.isSuccessful()) {
+                    onSendSuccess();
+                } else {
+                    onSendFailure();
+                }
             }
 
             @Override
@@ -970,8 +974,13 @@ public class ComposeActivity extends BaseActivity {
         item.uploadRequest.enqueue(new Callback<Media>() {
             @Override
             public void onResponse(Call<Media> call, retrofit2.Response<Media> response) {
-                item.id = response.body().id;
+                if (response.isSuccessful()) {
-                waitForMediaLatch.countDown();
+                    item.id = response.body().id;
+                    waitForMediaLatch.countDown();
+                } else {
+                    Log.d(TAG, "Upload request failed. " + response.message());
+                    onUploadFailure(item);
+                }
             }
 
             @Override

app/src/main/java/com/keylesspalace/tusky/LoginActivity.java

@@ -31,9 +31,7 @@ import android.widget.TextView;
 import com.keylesspalace.tusky.entity.AccessToken;
 import com.keylesspalace.tusky.entity.AppCredentials;
 
-import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 import retrofit2.Call;
@@ -43,6 +41,7 @@ import retrofit2.Retrofit;
 import retrofit2.converter.gson.GsonConverterFactory;
 
 public class LoginActivity extends BaseActivity {
+    private static final String TAG = "LoginActivity"; // logging tag
     private static String OAUTH_SCOPES = "read write follow";
 
     private SharedPreferences preferences;
@@ -126,6 +125,13 @@ public class LoginActivity extends BaseActivity {
             Callback<AppCredentials> callback = new Callback<AppCredentials>() {
                 @Override
                 public void onResponse(Call<AppCredentials> call, Response<AppCredentials> response) {
+                    if (!response.isSuccessful()) {
+                        editText.setError(
+                                "This app could not obtain authentication from that server " +
+                                "instance.");
+                        Log.e(TAG, "App authentication failed. " + response.message());
+                        return;
+                    }
                     AppCredentials credentials = response.body();
                     clientId = credentials.clientId;
                     clientSecret = credentials.clientSecret;
@@ -246,7 +252,11 @@ public class LoginActivity extends BaseActivity {
                 Callback<AccessToken> callback = new Callback<AccessToken>() {
                     @Override
                     public void onResponse(Call<AccessToken> call, Response<AccessToken> response) {
-                        onLoginSuccess(response.body().accessToken);
+                        if (response.isSuccessful()) {
+                            onLoginSuccess(response.body().accessToken);
+                        } else {
+                            editText.setError(response.message());
+                        }
                     }
 
                     @Override

app/src/main/java/com/keylesspalace/tusky/MainActivity.java

@@ -15,8 +15,6 @@
 
 package com.keylesspalace.tusky;
 
-import android.app.AlarmManager;
-import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -24,15 +22,11 @@ import android.graphics.PorterDuff;
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
-import android.os.SystemClock;
-import android.preference.PreferenceManager;
 import android.support.design.widget.FloatingActionButton;
 import android.support.design.widget.TabLayout;
 import android.support.v4.content.ContextCompat;
 import android.support.v4.view.ViewPager;
 import android.os.Bundle;
-import android.support.v7.widget.Toolbar;
-import android.text.Html;
 import android.text.SpannableStringBuilder;
 import android.text.Spanned;
 import android.text.TextUtils;
@@ -55,7 +49,6 @@ import com.mikepenz.materialdrawer.model.PrimaryDrawerItem;
 import com.mikepenz.materialdrawer.model.ProfileDrawerItem;
 import com.mikepenz.materialdrawer.model.SecondaryDrawerItem;
 import com.mikepenz.materialdrawer.model.interfaces.IDrawerItem;
-import com.mikepenz.materialdrawer.model.interfaces.IProfile;
 import com.mikepenz.materialdrawer.util.AbstractDrawerImageLoader;
 import com.mikepenz.materialdrawer.util.DrawerImageLoader;
 import com.squareup.picasso.Picasso;
@@ -75,7 +68,7 @@ public class MainActivity extends BaseActivity {
 
     private String loggedInAccountId;
     private String loggedInAccountUsername;
-    Stack<Integer> pageHistory = new Stack<Integer>();
+    Stack<Integer> pageHistory = new Stack<>();
     private AccountHeader headerResult;
     private Drawer drawer;
 
@@ -296,8 +289,12 @@ public class MainActivity extends BaseActivity {
                 mastodonAPI.searchAccounts(newQuery, false, 5).enqueue(new Callback<List<Account>>() {
                     @Override
                     public void onResponse(Call<List<Account>> call, Response<List<Account>> response) {
-                        searchView.swapSuggestions(response.body());
+                        if (response.isSuccessful()) {
-                        searchView.hideProgress();
+                            searchView.swapSuggestions(response.body());
+                            searchView.hideProgress();
+                        } else {
+                            searchView.hideProgress();
+                        }
                     }
 
                     @Override
@@ -359,6 +356,11 @@ public class MainActivity extends BaseActivity {
         mastodonAPI.accountVerifyCredentials().enqueue(new Callback<Account>() {
             @Override
             public void onResponse(Call<Account> call, retrofit2.Response<Account> response) {
+                if (!response.isSuccessful()) {
+                    onFetchUserInfoFailure(new Exception(response.message()));
+                    return;
+                }
+
                 Account me = response.body();
                 ImageView background = headerResult.getHeaderBackgroundView();
 

app/src/main/java/com/keylesspalace/tusky/MyFirebaseMessagingService.java

@@ -56,7 +56,9 @@ public class MyFirebaseMessagingService extends FirebaseMessagingService {
         mastodonAPI.notification(notificationId).enqueue(new Callback<Notification>() {
             @Override
             public void onResponse(Call<Notification> call, Response<Notification> response) {
-                buildNotification(response.body());
+                if (response.isSuccessful()) {
+                    buildNotification(response.body());
+                }
             }
 
             @Override

app/src/main/java/com/keylesspalace/tusky/NotificationsFragment.java

@@ -15,7 +15,6 @@
 
 package com.keylesspalace.tusky;
 
-import android.app.NotificationManager;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.graphics.drawable.Drawable;
@@ -141,7 +140,11 @@ public class NotificationsFragment extends SFragment implements
         api.notifications(fromId, uptoId, null).enqueue(new Callback<List<Notification>>() {
             @Override
             public void onResponse(Call<List<Notification>> call, retrofit2.Response<List<Notification>> response) {
-                onFetchNotificationsSuccess(response.body(), fromId);
+                if (response.isSuccessful()) {
+                    onFetchNotificationsSuccess(response.body(), fromId);
+                } else {
+                    onFetchNotificationsFailure(new Exception(response.message()));
+                }
             }
 
             @Override

app/src/main/java/com/keylesspalace/tusky/ReportActivity.java

@@ -17,7 +17,6 @@ package com.keylesspalace.tusky;
 
 import android.content.Intent;
 import android.graphics.drawable.Drawable;
-import android.net.Uri;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.design.widget.Snackbar;
@@ -29,7 +28,6 @@ import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
-import android.widget.Button;
 import android.widget.EditText;
 
 import com.keylesspalace.tusky.entity.Status;
@@ -122,7 +120,11 @@ public class ReportActivity extends BaseActivity {
         mastodonAPI.report(accountId, Arrays.asList(statusIds), comment).enqueue(new Callback<ResponseBody>() {
             @Override
             public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
-                onSendSuccess();
+                if (response.isSuccessful()) {
+                    onSendSuccess();
+                } else {
+                    onSendFailure(accountId, statusIds, comment);
+                }
             }
 
             @Override
@@ -155,6 +157,10 @@ public class ReportActivity extends BaseActivity {
         mastodonAPI.accountStatuses(accountId, null, null, null).enqueue(new Callback<List<Status>>() {
             @Override
             public void onResponse(Call<List<Status>> call, retrofit2.Response<List<Status>> response) {
+                if (!response.isSuccessful()) {
+                    onFetchStatusesFailure(new Exception(response.message()));
+                    return;
+                }
                 List<Status> statusList = response.body();
                 List<ReportAdapter.ReportStatus> itemList = new ArrayList<>();
                 for (Status status : statusList) {

app/src/main/java/com/keylesspalace/tusky/SFragment.java

@@ -83,8 +83,10 @@ public class SFragment extends Fragment {
         Callback<Status> cb = new Callback<Status>() {
             @Override
             public void onResponse(Call<Status> call, retrofit2.Response<Status> response) {
-                status.reblogged = reblog;
+                if (response.isSuccessful()) {
-                adapter.notifyItemChanged(position);
+                    status.reblogged = reblog;
+                    adapter.notifyItemChanged(position);
+                }
             }
 
             @Override
@@ -107,8 +109,10 @@ public class SFragment extends Fragment {
         Callback<Status> cb = new Callback<Status>() {
             @Override
             public void onResponse(Call<Status> call, retrofit2.Response<Status> response) {
-                status.favourited = favourite;
+                if (response.isSuccessful()) {
-                adapter.notifyItemChanged(position);
+                    status.favourited = favourite;
+                    adapter.notifyItemChanged(position);
+                }
             }
 
             @Override

app/src/main/java/com/keylesspalace/tusky/TimelineAdapter.java

@@ -86,8 +86,10 @@ class TimelineAdapter extends RecyclerView.Adapter implements AdapterItemRemover
 
     int update(List<Status> newStatuses) {
         int scrollToPosition;
-        if (statuses == null || statuses.isEmpty()) {
+        if (statuses.isEmpty()) {
-            statuses = newStatuses;
+            if (newStatuses != null) {
+                statuses = newStatuses;
+            }
             scrollToPosition = 0;
         } else {
             int index = newStatuses.indexOf(statuses.get(0));

app/src/main/java/com/keylesspalace/tusky/TimelineFragment.java

@@ -168,7 +168,11 @@ public class TimelineFragment extends SFragment implements
         Callback<List<Status>> cb = new Callback<List<Status>>() {
             @Override
             public void onResponse(Call<List<Status>> call, retrofit2.Response<List<Status>> response) {
-                onFetchTimelineSuccess(response.body(), fromId);
+                if (response.isSuccessful()) {
+                    onFetchTimelineSuccess(response.body(), fromId);
+                } else {
+                    onFetchTimelineFailure(new Exception(response.message()));
+                }
             }
 
             @Override

app/src/main/java/com/keylesspalace/tusky/ViewThreadFragment.java

@@ -82,8 +82,12 @@ public class ViewThreadFragment extends SFragment implements StatusActionListene
         api.status(id).enqueue(new Callback<Status>() {
             @Override
             public void onResponse(Call<Status> call, retrofit2.Response<Status> response) {
-                int position = adapter.insertStatus(response.body());
+                if (response.isSuccessful()) {
-                recyclerView.scrollToPosition(position);
+                    int position = adapter.insertStatus(response.body());
+                    recyclerView.scrollToPosition(position);
+                } else {
+                    onThreadRequestFailure(id);
+                }
             }
 
             @Override
@@ -99,10 +103,14 @@ public class ViewThreadFragment extends SFragment implements StatusActionListene
         api.statusContext(id).enqueue(new Callback<StatusContext>() {
             @Override
             public void onResponse(Call<StatusContext> call, retrofit2.Response<StatusContext> response) {
-                StatusContext context = response.body();
+                if (response.isSuccessful()) {
+                    StatusContext context = response.body();
 
-                adapter.addAncestors(context.ancestors);
+                    adapter.addAncestors(context.ancestors);
-                adapter.addDescendants(context.descendants);
+                    adapter.addDescendants(context.descendants);
+                } else {
+                    onThreadRequestFailure(id);
+                }
             }
 
             @Override

app/src/main/res/xml/preferences.xml

@@ -20,13 +20,4 @@
 
     </PreferenceCategory>
 
-    <PreferenceCategory android:title="@string/pref_title_appearance_settings">
-
-        <CheckBoxPreference
-            android:key="lightTheme"
-            android:title="@string/pref_title_light_theme"
-            android:defaultValue="false" />
-
-    </PreferenceCategory>
-
 </PreferenceScreen>