Wrote Loader for List of Alarms

app/src/main/java/com/philliphsu/clock2/alarms/AlarmsFragment.java

@@ -3,11 +3,11 @@ package com.philliphsu.clock2.alarms;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
-import android.database.Cursor;
 import android.os.Bundle;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.LoaderManager.LoaderCallbacks;
+import android.support.v4.content.Loader;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.util.Log;
@@ -19,23 +19,25 @@ import com.philliphsu.clock2.Alarm;
 import com.philliphsu.clock2.OnListItemInteractionListener;
 import com.philliphsu.clock2.R;
 import com.philliphsu.clock2.editalarm.EditAlarmActivity;
-import com.philliphsu.clock2.model.AlarmsListCursorLoader;
+import com.philliphsu.clock2.model.AlarmListLoader;
 import com.philliphsu.clock2.model.DatabaseManager;
 import com.philliphsu.clock2.util.AlarmUtils;
 
+import java.util.Collections;
+import java.util.List;
+
 import butterknife.Bind;
 import butterknife.ButterKnife;
 
 // TODO: Use native fragments since we're targeting API >=19?
 // TODO: Use native LoaderCallbacks.
-public class AlarmsFragment extends Fragment implements LoaderCallbacks<Cursor>,
+public class AlarmsFragment extends Fragment implements LoaderCallbacks<List<Alarm>>,
         OnListItemInteractionListener<Alarm> {
     private static final int REQUEST_EDIT_ALARM = 0;
     public static final int REQUEST_CREATE_ALARM = 1;
     private static final String TAG = "AlarmsFragment";
 
-    private AlarmsCursorAdapter mCursorAdapter;
-    private DatabaseManager mDatabaseManager;
+    private AlarmsAdapter mAdapter;
 
     @Bind(R.id.list) RecyclerView mList;
 
@@ -65,7 +67,6 @@ public class AlarmsFragment extends Fragment implements LoaderCallbacks<Cursor>,
 
         // Initialize the loader to load the list of runs
         getLoaderManager().initLoader(0, null, this);
-        mDatabaseManager = DatabaseManager.getInstance(getActivity());
     }
 
     @Override
@@ -76,8 +77,8 @@ public class AlarmsFragment extends Fragment implements LoaderCallbacks<Cursor>,
         // Set the adapter
         Context context = view.getContext();
         mList.setLayoutManager(new LinearLayoutManager(context));
-        mCursorAdapter = new AlarmsCursorAdapter(this);
-        mList.setAdapter(mCursorAdapter);
+        mAdapter = new AlarmsAdapter(Collections.<Alarm>emptyList(), this);
+        mList.setAdapter(mAdapter);
         return view;
     }
 
@@ -100,20 +101,20 @@ public class AlarmsFragment extends Fragment implements LoaderCallbacks<Cursor>,
     }
 
     @Override
-    public android.support.v4.content.Loader<Cursor> onCreateLoader(int id, Bundle args) {
-        return new AlarmsListCursorLoader(getActivity());
+    public Loader<List<Alarm>> onCreateLoader(int id, Bundle args) {
+        return new AlarmListLoader(getActivity());
     }
 
     @Override
-    public void onLoadFinished(android.support.v4.content.Loader<Cursor> loader, Cursor data) {
-        // Called on the main thread after loading is complete
-        mCursorAdapter.swapCursor(data);
+    public void onLoadFinished(Loader<List<Alarm>> loader, List<Alarm> data) {
+        mAdapter.replaceData(data);
     }
 
     @Override
-    public void onLoaderReset(android.support.v4.content.Loader<Cursor> loader) {
-        // The adapter's current cursor should not be used anymore
-        mCursorAdapter.swapCursor(null);
+    public void onLoaderReset(Loader<List<Alarm>> loader) {
+        // Can't pass in null, because replaceData() will try to add all the elements
+        // from the given collection, so we would run into an NPE.
+        mAdapter.replaceData(Collections.<Alarm>emptyList());
     }
 
     @Override
@@ -125,6 +126,7 @@ public class AlarmsFragment extends Fragment implements LoaderCallbacks<Cursor>,
 
         switch (requestCode) {
             case REQUEST_CREATE_ALARM:
+                // TODO: notifyItemInserted?
                 getLoaderManager().restartLoader(0, null, this);
             case REQUEST_EDIT_ALARM:
                 Alarm deletedAlarm;
@@ -132,6 +134,7 @@ public class AlarmsFragment extends Fragment implements LoaderCallbacks<Cursor>,
                         EditAlarmActivity.EXTRA_DELETED_ALARM)) != null) {
                     onListItemDeleted(deletedAlarm);
                 }
+                // TODO: notifyItemRemoved?
                 getLoaderManager().restartLoader(0, null, this);
                 break;
             default: