Task list is updated in the tab where a new task is created

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

@@ -3,7 +3,6 @@ package com.wismna.geoffroy.donext.activities;
 import android.app.Dialog;
 import android.app.DialogFragment;
 import android.content.Intent;
-import android.database.Cursor;
 import android.os.Bundle;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
@@ -11,6 +10,7 @@ import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -20,16 +20,18 @@ import android.widget.RadioGroup;
 import android.widget.Spinner;
 
 import com.wismna.geoffroy.donext.R;
+import com.wismna.geoffroy.donext.adapters.SmartFragmentStatePagerAdapter;
+import com.wismna.geoffroy.donext.adapters.TaskAdapter;
 import com.wismna.geoffroy.donext.dao.Task;
 import com.wismna.geoffroy.donext.dao.TaskList;
 import com.wismna.geoffroy.donext.database.TaskDataAccess;
 import com.wismna.geoffroy.donext.database.TaskListDataAccess;
 import com.wismna.geoffroy.donext.fragments.NewTaskFragment;
-import com.wismna.geoffroy.donext.fragments.TaskFragment;
+import com.wismna.geoffroy.donext.fragments.TasksFragment;
 
 import java.util.List;
 
-public class MainActivity extends AppCompatActivity implements NewTaskFragment.NewTaskListener, TaskFragment.OnListFragmentInteractionListener {
+public class MainActivity extends AppCompatActivity implements NewTaskFragment.NewTaskListener, TasksFragment.OnListFragmentInteractionListener {
 
     protected TaskDataAccess taskDataAccess;
     /**
@@ -122,20 +124,26 @@ public class MainActivity extends AppCompatActivity implements NewTaskFragment.N
     }
     @Override
     public void onDialogPositiveClick(DialogFragment dialog) {
+        // Get the dialog fragment
         Dialog dialogView = dialog.getDialog();
+        // Get the controls
         Spinner listSpinner = (Spinner) dialogView.findViewById(R.id.new_task_list);
         EditText nameText = (EditText) dialogView.findViewById(R.id.new_task_name);
         EditText descText = (EditText) dialogView.findViewById(R.id.new_task_description);
         RadioGroup priorityGroup = (RadioGroup) dialogView.findViewById(R.id.new_task_priority);
         RadioButton priorityRadio = (RadioButton) dialogView.findViewById(priorityGroup.getCheckedRadioButtonId());
-        Cursor cursor = taskDataAccess.createTask(
+        TaskList taskList = (TaskList) listSpinner.getSelectedItem();
+        // Add the task to the database
+        Task task = taskDataAccess.createTask(
                 nameText.getText().toString(),
                 descText.getText().toString(),
                 priorityRadio.getText().toString(),
-                ((TaskList) listSpinner.getSelectedItem()).getId());
+                taskList.getId());
 
-        // TODO: uncomment after successfully creating adapter
+        // Update the corresponding tab adapter
-        //adapter.changeCursor(cursor);
+        TasksFragment taskFragment = (TasksFragment) mSectionsPagerAdapter.getRegisteredFragment(listSpinner.getSelectedItemPosition());
+        TaskAdapter taskAdapter = ((TaskAdapter)((RecyclerView)taskFragment.getView()).getAdapter());
+        taskAdapter.add(task, taskAdapter.getItemCount());
     }
 
     @Override
@@ -176,7 +184,7 @@ public class MainActivity extends AppCompatActivity implements NewTaskFragment.N
      * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
      * one of the sections/tabs/pages.
      */
-    public class SectionsPagerAdapter extends FragmentPagerAdapter {
+    public class SectionsPagerAdapter extends SmartFragmentStatePagerAdapter {
 
         public SectionsPagerAdapter(FragmentManager fm) {
             super(fm);
@@ -186,7 +194,7 @@ public class MainActivity extends AppCompatActivity implements NewTaskFragment.N
         public Fragment getItem(int position) {
             // getItem is called to instantiate the fragment for the given page.
             // Return a PlaceholderFragment (defined as a static inner class below).
-            return TaskFragment.newInstance(taskLists.get(position).getId());
+            return TasksFragment.newInstance(taskLists.get(position).getId());
         }
 
         @Override

DoNExt/app/src/main/java/com/wismna/geoffroy/donext/adapters/SmartFragmentStatePagerAdapter.java

@@ -0,0 +1,45 @@
+package com.wismna.geoffroy.donext.adapters;
+
+/**
+ * Created by geoffroy on 15-11-28.
+ */
+
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentStatePagerAdapter;
+import android.util.SparseArray;
+import android.view.ViewGroup;
+
+/**
+   Extension of FragmentStatePagerAdapter which intelligently caches
+   all active fragments and manages the fragment lifecycles.
+   Usage involves extending from SmartFragmentStatePagerAdapter as you would any other PagerAdapter.
+*/
+public abstract class SmartFragmentStatePagerAdapter extends FragmentStatePagerAdapter {
+    // Sparse array to keep track of registered fragments in memory
+    private SparseArray<Fragment> registeredFragments = new SparseArray<>();
+
+    public SmartFragmentStatePagerAdapter(FragmentManager fragmentManager) {
+        super(fragmentManager);
+    }
+
+    // Register the fragment when the item is instantiated
+    @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        Fragment fragment = (Fragment) super.instantiateItem(container, position);
+        registeredFragments.put(position, fragment);
+        return fragment;
+    }
+
+    // Unregister when the item is inactive
+    @Override
+    public void destroyItem(ViewGroup container, int position, Object object) {
+        registeredFragments.remove(position);
+        super.destroyItem(container, position, object);
+    }
+
+    // Returns the fragment for the position (if instantiated)
+    public Fragment getRegisteredFragment(int position) {
+        return registeredFragments.get(position);
+    }
+}

DoNExt/app/src/main/java/com/wismna/geoffroy/donext/adapters/TaskAdapter.java

@@ -8,14 +8,13 @@ import android.widget.TextView;
 
 import com.wismna.geoffroy.donext.R;
 import com.wismna.geoffroy.donext.dao.Task;
-import com.wismna.geoffroy.donext.fragments.TaskFragment.OnListFragmentInteractionListener;
+import com.wismna.geoffroy.donext.fragments.TasksFragment.OnListFragmentInteractionListener;
 
 import java.util.List;
 
 /**
  * {@link RecyclerView.Adapter} that can display a {@link Task} and makes a call to the
  * specified {@link OnListFragmentInteractionListener}.
- * TODO: Replace the implementation with code for your data type.
  */
 public class TaskAdapter extends RecyclerView.Adapter<TaskAdapter.ViewHolder> {
 
@@ -57,6 +56,17 @@ public class TaskAdapter extends RecyclerView.Adapter<TaskAdapter.ViewHolder> {
         return mValues.size();
     }
 
+    public void add(Task item, int position) {
+        mValues.add(position, item);
+        notifyItemInserted(position);
+    }
+
+    public void remove(Task item) {
+        int position = mValues.indexOf(item);
+        mValues.remove(position);
+        notifyItemRemoved(position);
+    }
+
     public class ViewHolder extends RecyclerView.ViewHolder {
         public final View mView;
         public final TextView mIdView;

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

@@ -40,14 +40,21 @@ public class TaskDataAccess {
     public void close() {
         dbHelper.close();
     }
-    public Cursor createTask(String name, String description, String priority, long taskList) {
+    public Task createTask(String name, String description, String priority, long taskList) {
         ContentValues values = new ContentValues();
         values.put(DatabaseHelper.TASKS_COLUMN_NAME, name);
         values.put(DatabaseHelper.TASKS_COLUMN_DESC, description);
         values.put(DatabaseHelper.TASKS_COLUMN_PRIORITY, priorities.indexOf(priority));
         values.put(DatabaseHelper.TASKS_COLUMN_LIST, taskList);
-        database.insert(DatabaseHelper.TASKS_TABLE_NAME, null, values);
+        long insertId = database.insert(DatabaseHelper.TASKS_TABLE_NAME, null, values);
-        return getAllTasksCursor();
+
+        Cursor cursor = database.query(DatabaseHelper.TASKS_TABLE_NAME,
+                taskColumns, DatabaseHelper.COLUMN_ID + " = " + insertId, null,
+                null, null, null);
+        cursor.moveToFirst();
+        Task newTask = cursorToTask(cursor);
+        cursor.close();
+        return newTask;
     }
 
     public Cursor deleteTask(Cursor taskCursor) {

DoNExt/app/src/main/java/com/wismna/geoffroy/donext/fragments/TasksFragment.java

@@ -20,7 +20,7 @@ import com.wismna.geoffroy.donext.database.TaskDataAccess;
  * Activities containing this fragment MUST implement the {@link OnListFragmentInteractionListener}
  * interface.
  */
-public class TaskFragment extends Fragment {
+public class TasksFragment extends Fragment {
 
     private TaskDataAccess taskDataAccess;
     private static final String TASK_LIST_ID = "task_list_id";
@@ -31,12 +31,12 @@ public class TaskFragment extends Fragment {
      * Mandatory empty constructor for the fragment manager to instantiate the
      * fragment (e.g. upon screen orientation changes).
      */
-    public TaskFragment() {
+    public TasksFragment() {
     }
 
     @SuppressWarnings("unused")
-    public static TaskFragment newInstance(long taskListId) {
+    public static TasksFragment newInstance(long taskListId) {
-        TaskFragment fragment = new TaskFragment();
+        TasksFragment fragment = new TasksFragment();
         Bundle args = new Bundle();
         args.putLong(TASK_LIST_ID, taskListId);
         fragment.setArguments(args);

DoNExt/app/src/main/res/layout/fragment_task_list.xml

@@ -9,5 +9,5 @@
     android:layout_marginLeft="16dp"
     android:layout_marginRight="16dp"
     app:layoutManager="LinearLayoutManager"
-    tools:context=".fragments.TaskFragment"
+    tools:context=".fragments.TasksFragment"
     tools:listitem="@layout/fragment_task" />