SonarQube code smells corrections

app/src/main/java/com/wismna/geoffroy/donext/activities/MainActivity.java

@@ -23,6 +23,8 @@ import com.wismna.geoffroy.donext.fragments.TaskFormDialogFragment;
 import com.wismna.geoffroy.donext.fragments.TaskListsDialogFragment;
 import com.wismna.geoffroy.donext.fragments.TasksFragment;
 
+import java.util.Objects;
+
 /**
  * Main Activity class
  */
@@ -80,13 +82,13 @@ public class MainActivity extends AppCompatActivity {
         SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
         SharedPreferences.Editor editor = sharedPref.edit();
         String layoutTypeString = sharedPref.getString("pref_conf_task_layout", "1");
-        int layoutType = Integer.valueOf(layoutTypeString);
+        int layoutType = Integer.parseInt(layoutTypeString);
         editor.putString("pref_conf_task_layout", String.valueOf(layoutType % 2 + 1));
         editor.apply();
 
         // Update the ViewPagerAdapter to refresh all tabs
         ViewPager viewPager = getMainFragmentViewPager();
-        viewPager.getAdapter().notifyDataSetChanged();
+        Objects.requireNonNull(viewPager.getAdapter()).notifyDataSetChanged();
     }
 
     /** Called when the user clicks the Edit Lists button  */

app/src/main/java/com/wismna/geoffroy/donext/activities/TodayActivity.java

@@ -75,7 +75,7 @@ public class TodayActivity extends ToolBarActivityBase
         SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
         SharedPreferences.Editor editor = sharedPref.edit();
         String layoutTypeString = sharedPref.getString("pref_conf_task_layout", "1");
-        int layoutType = Integer.valueOf(layoutTypeString);
+        int layoutType = Integer.parseInt(layoutTypeString);
         editor.putString("pref_conf_task_layout", String.valueOf(layoutType % 2 + 1));
         editor.apply();
 

app/src/main/java/com/wismna/geoffroy/donext/adapters/TaskListRecyclerViewAdapter.java

@@ -21,7 +21,7 @@ import java.util.List;
  * {@link RecyclerView.Adapter} that can display a {@link TaskList}.
  */
 
-public class TaskListRecyclerViewAdapter extends RecyclerView.Adapter<TaskListRecyclerViewAdapter.ViewHolder>
+public class TaskListRecyclerViewAdapter extends RecyclerView.Adapter<TaskListRecyclerViewAdapter.TaskViewHolder>
     implements TaskListTouchHelper.TaskListTouchHelperAdapter {
 
     public interface TaskListRecyclerViewAdapterListener {
@@ -41,14 +41,14 @@ public class TaskListRecyclerViewAdapter extends RecyclerView.Adapter<TaskListRe
     }
 
     @Override
-    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+    public TaskViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         View view = LayoutInflater.from(parent.getContext())
                 .inflate(R.layout.fragment_tasklist, parent, false);
-        return new ViewHolder(view);
+        return new TaskViewHolder(view);
     }
 
     @Override
-    public void onBindViewHolder(final ViewHolder holder, int position) {
+    public void onBindViewHolder(final TaskViewHolder holder, int position) {
         holder.mItem = mValues.get(position);
         holder.mTaskCountView.setText(String.valueOf(mValues.get(position).getTaskCount()));
         holder.mTaskNameView.setText(mValues.get(position).getName());
@@ -134,7 +134,7 @@ public class TaskListRecyclerViewAdapter extends RecyclerView.Adapter<TaskListRe
         return true;
     }
 
-    class ViewHolder extends RecyclerView.ViewHolder {
+    class TaskViewHolder extends RecyclerView.ViewHolder {
         final View mView;
         final ImageView handleView;
         final TextView mTaskCountView;
@@ -142,7 +142,7 @@ public class TaskListRecyclerViewAdapter extends RecyclerView.Adapter<TaskListRe
         final Button mTaskDeleteButton;
         TaskList mItem;
 
-        ViewHolder(View view) {
+        TaskViewHolder(View view) {
             super(view);
             mView = view;
             handleView = itemView.findViewById(R.id.handle);

app/src/main/java/com/wismna/geoffroy/donext/adapters/TaskRecyclerViewAdapter.java

@@ -2,6 +2,7 @@ package com.wismna.geoffroy.donext.adapters;
 
 import android.graphics.Color;
 import android.graphics.Typeface;
+import android.support.annotation.NonNull;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -32,25 +33,25 @@ public class TaskRecyclerViewAdapter extends RecyclerView.Adapter<TaskRecyclerVi
         this.viewType = viewType;
     }
 
+    @NonNull
     @Override
-    public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+    public SimpleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
         View view;
         switch (viewType)
         {
-            case 1:
-                view = LayoutInflater.from(parent.getContext())
-                        .inflate(R.layout.fragment_task_simple, parent, false);
-                return new SimpleViewHolder(view);
             case 2:
                 view = LayoutInflater.from(parent.getContext())
                         .inflate(R.layout.fragment_task_detailed, parent, false);
                 return new DetailedViewHolder(view);
+            default:
+                view = LayoutInflater.from(parent.getContext())
+                        .inflate(R.layout.fragment_task_simple, parent, false);
+                return new SimpleViewHolder(view);
         }
-        return null;
     }
 
     @Override
-    public void onBindViewHolder(final SimpleViewHolder holder, int position) {
+    public void onBindViewHolder(@NonNull final SimpleViewHolder holder, int position) {
         // Set basic information
         holder.mItem = mValues.get(position);
         holder.mIdView.setText(String.valueOf(holder.mItem.getId()));
@@ -84,6 +85,9 @@ public class TaskRecyclerViewAdapter extends RecyclerView.Adapter<TaskRecyclerVi
             case 2:
                 holder.mTitleView.setTypeface(holder.mTitleView.getTypeface(), Typeface.BOLD);
                 break;
+            default:
+                // No special styles to apply
+                break;
         }
     }
 

app/src/main/java/com/wismna/geoffroy/donext/database/TaskDataAccess.java

@@ -25,7 +25,7 @@ public class TaskDataAccess implements AutoCloseable {
 
     private SQLiteDatabase database;
     private final DatabaseHelper dbHelper;
-    private final String[] taskColumns = {
+    private final static String[] taskColumns = {
             DatabaseHelper.COLUMN_ID, DatabaseHelper.TASKS_COLUMN_NAME,
             DatabaseHelper.TASKS_COLUMN_DESC, DatabaseHelper.TASKS_COLUMN_PRIORITY,
             DatabaseHelper.TASKS_COLUMN_CYCLE, DatabaseHelper.TASKS_COLUMN_DONE,
@@ -40,7 +40,7 @@ public class TaskDataAccess implements AutoCloseable {
         open(writeMode);
     }
 
-    private void open(MODE writeMode) throws SQLException {
+    private void open(MODE writeMode) {
         if (writeMode == MODE.WRITE) database = dbHelper.getWritableDatabase();
         else database = dbHelper.getReadableDatabase();
     }

app/src/main/java/com/wismna/geoffroy/donext/database/TaskListDataAccess.java

@@ -23,7 +23,7 @@ public class TaskListDataAccess implements AutoCloseable {
     // Database fields
     private SQLiteDatabase database;
     private final DatabaseHelper dbHelper;
-    private final String[] taskListColumns =
+    private final static String[] taskListColumns =
             {DatabaseHelper.COLUMN_ID, DatabaseHelper.TASKLIST_COLUMN_NAME,
             DatabaseHelper.COLUMN_ORDER, DatabaseHelper.TASKLIST_COLUMN_VISIBLE};
 
@@ -35,7 +35,7 @@ public class TaskListDataAccess implements AutoCloseable {
         open(writeMode);
     }
 
-    public void open(MODE writeMode) throws SQLException {
+    public void open(MODE writeMode) {
         if (writeMode == MODE.WRITE) database = dbHelper.getWritableDatabase();
         else database = dbHelper.getReadableDatabase();
     }

app/src/main/java/com/wismna/geoffroy/donext/fragments/ConfirmDialogFragment.java

@@ -22,11 +22,9 @@ public class ConfirmDialogFragment extends DialogFragment {
         NO
     }
     private ConfirmDialogListener confirmDialogListener;
-    //private String message;
 
-    public static ConfirmDialogFragment newInstance(/*String message, */ConfirmDialogListener confirmDialogListener) {
+    public static ConfirmDialogFragment newInstance(ConfirmDialogListener confirmDialogListener) {
         ConfirmDialogFragment fragment = new ConfirmDialogFragment();
-        //fragment.message = message;
         fragment.confirmDialogListener = confirmDialogListener;
         fragment.setRetainInstance(true);
         return fragment;