Abstracted SQL, Cursor, Loader, Adapter, RecyclerView

app/src/main/AndroidManifest.xml

@@ -79,7 +79,13 @@
             android:exported="false">
         </service>
 
-        <activity android:name=".edittimer.EditTimerActivity">
+        <activity android:name=".edittimer.EditTimerActivity"
+                  android:label="@string/title_activity_create_timer"
+                  android:parentActivityName=".MainActivity"
+                  android:windowSoftInputMode="adjustNothing">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="com.philliphsu.clock2.MainActivity"/>
         </activity>
     </application>
 

app/src/main/java/com/philliphsu/clock2/BaseCursorAdapter.java

@@ -0,0 +1,78 @@
+package com.philliphsu.clock2;
+
+import android.support.v7.widget.RecyclerView;
+import android.util.Log;
+import android.view.ViewGroup;
+
+import com.philliphsu.clock2.model.BaseItemCursor;
+import com.philliphsu.clock2.model.ObjectWithId;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ */
+public abstract class BaseCursorAdapter<
+        T extends ObjectWithId,
+        VH extends BaseViewHolder<T>,
+        C extends BaseItemCursor<T>>
+    extends RecyclerView.Adapter<VH> {
+
+    private static final String TAG = "BaseCursorAdapter";
+
+    private final OnListItemInteractionListener<T> mListener;
+    private C mCursor;
+
+    protected abstract VH onCreateViewHolder(ViewGroup parent, OnListItemInteractionListener<T> listener);
+
+    public BaseCursorAdapter(OnListItemInteractionListener<T> listener) {
+        mListener = listener;
+        // Excerpt from docs of notifyDataSetChanged():
+        // "RecyclerView will attempt to synthesize [artificially create?]
+        // visible structural change events [when items are inserted, removed or
+        // moved] for adapters that report that they have stable IDs when
+        // [notifyDataSetChanged()] is used. This can help for the purposes of
+        // animation and visual object persistence [?] but individual item views
+        // will still need to be rebound and relaid out."
+        setHasStableIds(true);
+    }
+
+    /**
+     * not final to allow subclasses to use the viewType if needed
+     */
+    @Override
+    public VH onCreateViewHolder(ViewGroup parent, int viewType) {
+        return onCreateViewHolder(parent, mListener);
+    }
+
+    @Override
+    public final void onBindViewHolder(VH holder, int position) {
+        if (!mCursor.moveToPosition(position)) {
+            Log.e(TAG, "Failed to bind item at position " + position);
+            return;
+        }
+        holder.onBind(mCursor.getItem());
+    }
+
+    @Override
+    public final int getItemCount() {
+        return mCursor == null ? 0 : mCursor.getCount();
+    }
+
+    @Override
+    public final long getItemId(int position) {
+        if (mCursor == null || !mCursor.moveToPosition(position)) {
+            return super.getItemId(position); // -1
+        }
+        return mCursor.getId();
+    }
+
+    public final void swapCursor(C cursor) {
+        if (mCursor == cursor) {
+            return;
+        }
+        if (mCursor != null) {
+            mCursor.close();
+        }
+        mCursor = cursor;
+        notifyDataSetChanged();
+    }
+}

app/src/main/java/com/philliphsu/clock2/MainActivity.java

@@ -15,7 +15,6 @@ import android.view.ViewGroup;
 import android.widget.TextView;
 
 import com.philliphsu.clock2.alarms.AlarmsFragment;
-import com.philliphsu.clock2.editalarm.EditAlarmActivity;
 import com.philliphsu.clock2.settings.SettingsActivity;
 import com.philliphsu.clock2.timers.TimersFragment;
 
@@ -56,13 +55,17 @@ public class MainActivity extends BaseActivity {
         mFab.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
-                Intent intent = new Intent(MainActivity.this, EditAlarmActivity.class);
+//                Intent intent = new Intent(MainActivity.this, EditAlarmActivity.class);
-                // Call Fragment#startActivityForResult() instead of Activity#startActivityForResult()
+//                // Call Fragment#startActivityForResult() instead of Activity#startActivityForResult()
-                // because we want the result to be handled in the Fragment, not in this Activity.
+//                // because we want the result to be handled in the Fragment, not in this Activity.
-                // FragmentActivity does NOT deliver the result to the Fragment, i.e. your
+//                // FragmentActivity does NOT deliver the result to the Fragment, i.e. your
-                // Fragment's onActivityResult() will NOT be called.
+//                // Fragment's onActivityResult() will NOT be called.
-                mSectionsPagerAdapter.getCurrentFragment()
+//                mSectionsPagerAdapter.getCurrentFragment()
-                        .startActivityForResult(intent, AlarmsFragment.REQUEST_CREATE_ALARM);
+//                        .startActivityForResult(intent, AlarmsFragment.REQUEST_CREATE_ALARM);
+                Fragment f;
+                if ((f = mSectionsPagerAdapter.getCurrentFragment()) instanceof RecyclerViewFragment) {
+                    ((RecyclerViewFragment) f).onFabClick();
+                }
             }
         });
     }

app/src/main/java/com/philliphsu/clock2/RecyclerViewFragment.java

@@ -1,6 +1,5 @@
 package com.philliphsu.clock2;
 
-import android.database.Cursor;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v4.app.LoaderManager;
@@ -11,16 +10,20 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import com.philliphsu.clock2.model.BaseItemCursor;
+import com.philliphsu.clock2.model.ObjectWithId;
+
 import butterknife.Bind;
 
 /**
  * Created by Phillip Hsu on 7/26/2016.
  */
-public abstract class RecyclerViewFragment<T,
+public abstract class RecyclerViewFragment<T extends ObjectWithId,
         VH extends BaseViewHolder<T>,
-        A extends BaseAdapter<T, VH>> // TODO: From AlarmsCursorAdapter, abstract it out and use that type here.
+        C extends BaseItemCursor<T>,
+        A extends BaseCursorAdapter<T, VH, C>>
     extends BaseFragment implements
-        LoaderManager.LoaderCallbacks<Cursor>,
+        LoaderManager.LoaderCallbacks<C>,
         OnListItemInteractionListener<T> {
 
     private A mAdapter;
@@ -45,6 +48,12 @@ public abstract class RecyclerViewFragment<T,
         return new LinearLayoutManager(getActivity());
     }
 
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        getLoaderManager().initLoader(0, null, this);
+    }
+
     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
@@ -55,15 +64,13 @@ public abstract class RecyclerViewFragment<T,
     }
 
     @Override
-    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
+    public void onLoadFinished(Loader<C> loader, C data) {
-        // TODO: Change the adapter type to one that supports Cursors as its dataset
+        mAdapter.swapCursor(data);
-//        mAdapter.swapCursor(data);
     }
 
     @Override
-    public void onLoaderReset(Loader<Cursor> loader) {
+    public void onLoaderReset(Loader<C> loader) {
-        // TODO: Change the adapter type to one that supports Cursors as its dataset
+        mAdapter.swapCursor(null);
-//        mAdapter.swapCursor(null);
     }
 
     /**

app/src/main/java/com/philliphsu/clock2/Timer.java

@@ -3,6 +3,7 @@ package com.philliphsu.clock2;
 import android.os.SystemClock;
 
 import com.google.auto.value.AutoValue;
+import com.philliphsu.clock2.model.ObjectWithId;
 
 import java.util.concurrent.TimeUnit;
 
@@ -10,10 +11,9 @@ import java.util.concurrent.TimeUnit;
  * Created by Phillip Hsu on 7/25/2016.
  */
 @AutoValue
-public abstract class Timer {
+public abstract class Timer extends ObjectWithId {
     private static final long MINUTE = TimeUnit.MINUTES.toMillis(1);
 
-    private long id;
     private long endTime;
     private long pauseTime;
 
@@ -42,14 +42,6 @@ public abstract class Timer {
         return new AutoValue_Timer(hour, minute, second, group, label);
     }
 
-    public long id() {
-        return id;
-    }
-
-    public void setId(long id) {
-        this.id = id;
-    }
-
     public long endTime() {
         return endTime;
     }
@@ -115,4 +107,25 @@ public abstract class Timer {
     public boolean isRunning() {
         return hasStarted() && pauseTime == 0;
     }
+
+    /**
+     * TO ONLY BE CALLED BY TIMERDATABASEHELPER.
+     */
+    public void setEndTime(long endTime) {
+        this.endTime = endTime;
+    }
+
+    /**
+     * TO ONLY BE CALLED BY TIMERDATABASEHELPER.
+     */
+    public void setPauseTime(long pauseTime) {
+        this.pauseTime = pauseTime;
+    }
+
+    /**
+     * TO ONLY BE CALLED BY TIMERDATABASEHELPER.
+     */
+    public long pauseTime() {
+        return pauseTime;
+    }
 }

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

@@ -13,7 +13,7 @@ import com.philliphsu.clock2.util.AlarmController;
 /**
  * Created by Phillip Hsu on 6/29/2016.
  *
- * TODO: Make this abstract for other data types.
+ * TODO: Extend from BaseCursorAdapter
  */
 public class AlarmsCursorAdapter extends RecyclerView.Adapter<AlarmViewHolder> {
     private static final String TAG = "AlarmsCursorAdapter";

app/src/main/java/com/philliphsu/clock2/edittimer/EditTimerActivity.java

@@ -153,6 +153,7 @@ public class EditTimerActivity extends BaseActivity {
         // TODO: Pass back an intent with the data, or make Timer parcelable
         // and pass back an instance of Timer. Consider overriding finish()
         // and doing it there.
+        setResult(RESULT_OK);
         finish();
     }
 

app/src/main/java/com/philliphsu/clock2/model/BaseDatabaseHelper.java

@@ -0,0 +1,114 @@
+package com.philliphsu.clock2.model;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+import com.philliphsu.clock2.util.LocalBroadcastHelper;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ */
+public abstract class BaseDatabaseHelper<T extends ObjectWithId> extends SQLiteOpenHelper {
+
+    public static final String COLUMN_ID = "_id";
+
+    private final Context mAppContext;
+
+    /**
+     * @param context the Context with which the application context will be retrieved
+     * @param name the name of the database file. Because this is required by the SQLiteOpenHelper
+     *             constructor, we can't, for instance, have an abstract getDatabaseFileName() that
+     *             subclasses implement and the base class can call on their behalf.
+     * @param version the version
+     */
+    public BaseDatabaseHelper(Context context, String name,
+                              /*SQLiteDatabase.CursorFactory factory,*/
+                              int version) {
+        super(context.getApplicationContext(), name, null, version);
+        mAppContext = context.getApplicationContext();
+    }
+
+    /**
+     * @return the table managed by this helper
+     */
+    protected abstract String getTableName();
+
+    /**
+     * @return the ContentValues representing the item's properties.
+     * You do not need to put a mapping for {@link #COLUMN_ID}, since
+     * the database manages ids for us (if you created your table
+     * with {@link #COLUMN_ID} as an {@code INTEGER PRIMARY KEY}).
+     */
+    protected abstract ContentValues toContentValues(T item);
+
+    /**
+     * @return optional String specifying the sort order
+     * to use when querying the database. The default
+     * implementation returns null, which may return
+     * queries unordered.
+     */
+    protected String getQuerySortOrder() {
+        return null;
+    }
+
+    public long insertItem(T item) {
+        long id = getWritableDatabase().insert(
+                getTableName(), null, toContentValues(item));
+        item.setId(id);
+        notifyContentChanged();
+        return id;
+    }
+
+    public int updateItem(long id, T newItem) {
+        newItem.setId(id);
+        SQLiteDatabase db = getWritableDatabase();
+        int rowsUpdated = db.update(getTableName(),
+                toContentValues(newItem),
+                COLUMN_ID + " = " + id,
+                null);
+        notifyContentChanged();
+        return rowsUpdated;
+    }
+
+    public int deleteItem(T item) {
+        SQLiteDatabase db = getWritableDatabase();
+        int rowsDeleted = db.delete(getTableName(),
+                COLUMN_ID + " = " + item.getId(),
+                null);
+        notifyContentChanged();
+        return rowsDeleted;
+    }
+
+    public Cursor queryItem(long id) {
+        return queryItems(COLUMN_ID + " = " + id, "1");
+    }
+
+    public Cursor queryItems() {
+        // Select all rows and columns
+        return queryItems(null, null);
+    }
+
+    protected Cursor queryItems(String where, String limit) {
+        return getReadableDatabase().query(getTableName(),
+                null, // All columns
+                where, // Selection, i.e. where COLUMN_* = [value we're looking for]
+                null, // selection args, none b/c id already specified in selection
+                null, // group by
+                null, // having
+                getQuerySortOrder(), // order/sort by
+                limit); // limit
+    }
+
+    /**
+     * Broadcasts to any registered receivers that the data backed
+     * by this helper has changed, and so they should requery and
+     * update themselves as necessary.
+     */
+    private void notifyContentChanged() {
+        LocalBroadcastHelper.sendBroadcast(mAppContext,
+                SQLiteCursorLoader.ACTION_CHANGE_CONTENT);
+    }
+}

app/src/main/java/com/philliphsu/clock2/model/BaseItemCursor.java

@@ -0,0 +1,38 @@
+package com.philliphsu.clock2.model;
+
+import android.database.Cursor;
+import android.database.CursorWrapper;
+import android.util.Log;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ */
+public abstract class BaseItemCursor<T extends ObjectWithId> extends CursorWrapper {
+    private static final String TAG = "BaseItemCursor";
+
+    public BaseItemCursor(Cursor cursor) {
+        super(cursor);
+    }
+
+    /**
+     * @return an item instance configured for the current row,
+     * or null if the current row is invalid
+     */
+    public abstract T getItem();
+
+    public long getId() {
+        if (isBeforeFirst() || isAfterLast()) {
+            Log.e(TAG, "Failed to retrieve id, cursor out of range");
+            return -1;
+        }
+        return getLong(getColumnIndexOrThrow(BaseDatabaseHelper.COLUMN_ID));
+    }
+
+    /**
+     * Helper method to determine boolean-valued columns.
+     * SQLite does not support a BOOLEAN data type.
+     */
+    protected boolean isTrue(String columnName) {
+        return getInt(getColumnIndexOrThrow(columnName)) == 1;
+    }
+}

app/src/main/java/com/philliphsu/clock2/model/NewSQLiteCursorLoader.java

@@ -0,0 +1,130 @@
+package com.philliphsu.clock2.model;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.support.v4.content.AsyncTaskLoader;
+import android.util.Log;
+
+import com.philliphsu.clock2.util.LocalBroadcastHelper;
+
+/**
+ * Created by Phillip Hsu on 6/28/2016.
+ *
+ * Efficiently loads and holds a Cursor.
+ */
+public abstract class NewSQLiteCursorLoader<
+        T extends ObjectWithId,
+        C extends BaseItemCursor<T>>
+        extends AsyncTaskLoader<C> {
+    private static final String TAG = "SQLiteCursorLoader";
+
+    public static final String ACTION_CHANGE_CONTENT = "com.philliphsu.clock2.model.action.CHANGE_CONTENT";
+
+    private C mCursor;
+    private OnContentChangeReceiver mOnContentChangeReceiver;
+
+    public NewSQLiteCursorLoader(Context context) {
+        super(context);
+    }
+
+    protected abstract C loadCursor();
+
+    /* Runs on a worker thread */
+    @Override
+    public C loadInBackground() {
+        C cursor = loadCursor();
+        if (cursor != null) {
+            // Ensure that the content window is filled
+            // Ensure that the data is available in memory once it is
+            // passed to the main thread
+            cursor.getCount();
+        }
+        return cursor;
+    }
+
+    /* Runs on the UI thread */
+    @Override
+    public void deliverResult(C cursor) {
+        if (isReset()) {
+            // An async query came in while the loader is stopped
+            if (cursor != null) {
+                cursor.close();
+            }
+            return;
+        }
+        Cursor oldCursor = mCursor;
+        mCursor = cursor;
+
+        if (isStarted()) {
+            super.deliverResult(cursor);
+        }
+
+        // Close the old cursor because it is no longer needed.
+        // Because an existing cursor may be cached and redelivered, it is important
+        // to make sure that the old cursor and the new cursor are not the
+        // same before the old cursor is closed.
+        if (oldCursor != null && oldCursor != cursor && !oldCursor.isClosed()) {
+            oldCursor.close();
+        }
+    }
+
+    // Refer to the docs if you wish to understand the rest of the API as used below.
+
+    @Override
+    protected void onStartLoading() {
+        if (mCursor != null) {
+            deliverResult(mCursor);
+        }
+
+        if (mOnContentChangeReceiver == null) {
+            mOnContentChangeReceiver = new OnContentChangeReceiver();
+            LocalBroadcastHelper.registerReceiver(getContext(),
+                    mOnContentChangeReceiver, ACTION_CHANGE_CONTENT);
+        }
+
+        if (takeContentChanged() || mCursor == null) {
+            forceLoad();
+        }
+    }
+
+    @Override
+    protected void onStopLoading() {
+        // Attempt to cancel the current load task if possible.
+        cancelLoad();
+    }
+
+    @Override
+    public void onCanceled(C cursor) {
+        if (cursor != null && !cursor.isClosed()) {
+            cursor.close();
+        }
+    }
+
+    @Override
+    protected void onReset() {
+        super.onReset();
+        // Ensure the loader is stopped
+        onStopLoading();
+
+        if (mCursor != null && !mCursor.isClosed()) {
+            mCursor.close();
+        }
+        mCursor = null;
+
+        if (mOnContentChangeReceiver != null) {
+            LocalBroadcastHelper.unregisterReceiver(getContext(),
+                    mOnContentChangeReceiver);
+            mOnContentChangeReceiver = null;
+        }
+    }
+
+    private final class OnContentChangeReceiver extends BroadcastReceiver {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            Log.d(TAG, "Received content change event");
+            onContentChanged();
+        }
+    }
+}

app/src/main/java/com/philliphsu/clock2/model/ObjectWithId.java

@@ -0,0 +1,18 @@
+package com.philliphsu.clock2.model;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ *
+ * Superclass for objects that can be persisted in SQLite.
+ */
+public abstract class ObjectWithId {
+    private long id;
+
+    public final long getId() {
+        return id;
+    }
+
+    public final void setId(long id) {
+        this.id = id;
+    }
+}

app/src/main/java/com/philliphsu/clock2/model/TimerDatabaseHelper.java

@@ -0,0 +1,132 @@
+package com.philliphsu.clock2.model;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+
+import com.philliphsu.clock2.Timer;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ */
+public class TimerDatabaseHelper extends BaseDatabaseHelper<Timer> {
+    private static final String TAG = "TimerDatabaseHelper";
+    private static final String DB_NAME = "timers.db";
+    private static final int VERSION_1 = 1;
+
+    private static final String TABLE_TIMERS = "timers";
+    // TODO: Consider making these public, so we can move TimerCursor to its own top-level class.
+    private static final String COLUMN_HOUR = "hour";
+    private static final String COLUMN_MINUTE = "minute";
+    private static final String COLUMN_SECOND = "second";
+    private static final String COLUMN_LABEL = "label";
+
+    // http://stackoverflow.com/q/24183958/5055032
+    // https://www.sqlite.org/lang_keywords.html
+    // GROUP is a reserved keyword, so your CREATE TABLE statement
+    // will not compile if you include this!
+//    private static final String COLUMN_GROUP = "group";
+
+    private static final String COLUMN_END_TIME = "end_time";
+    private static final String COLUMN_PAUSE_TIME = "pause_time";
+
+    private static final String SORT_ORDER =
+            COLUMN_HOUR + " ASC, "
+            + COLUMN_MINUTE + " ASC, "
+            + COLUMN_SECOND + " ASC, "
+            // All else equal, newer timers first
+            + COLUMN_ID + " DESC";
+
+    public TimerDatabaseHelper(Context context) {
+        super(context, DB_NAME, VERSION_1);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        db.execSQL("CREATE TABLE " + TABLE_TIMERS + " ("
+                + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+                + COLUMN_HOUR + " INTEGER NOT NULL, "
+                + COLUMN_MINUTE + " INTEGER NOT NULL, "
+                + COLUMN_SECOND + " INTEGER NOT NULL, "
+                + COLUMN_LABEL + " TEXT NOT NULL, "
+//                + COLUMN_GROUP + " TEXT NOT NULL, "
+                + COLUMN_END_TIME + " INTEGER NOT NULL, "
+                + COLUMN_PAUSE_TIME + " INTEGER NOT NULL);");
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        // I don't think we need to drop current tables unless you make structural changes
+        // to the schema in the new version.
+    }
+
+    // =============================================================================================
+    // Overridden methods can have a more specific return type, as long as that type
+    // is a subtype of the original return type.
+
+    @Override
+    public TimerCursor queryItem(long id) {
+        return wrapInTimerCursor(queryItem(id));
+    }
+
+    @Override
+    public TimerCursor queryItems() {
+        return wrapInTimerCursor(super.queryItems());
+    }
+
+    @Override
+    protected TimerCursor queryItems(String where, String limit) {
+        return wrapInTimerCursor(super.queryItems(where, limit));
+    }
+    // =============================================================================================
+
+    @Override
+    protected String getTableName() {
+        return TABLE_TIMERS;
+    }
+
+    @Override
+    protected ContentValues toContentValues(Timer timer) {
+        ContentValues cv = new ContentValues();
+        cv.put(COLUMN_HOUR, timer.hour());
+        cv.put(COLUMN_MINUTE, timer.minute());
+        cv.put(COLUMN_SECOND, timer.second());
+        cv.put(COLUMN_LABEL, timer.label());
+//        cv.put(COLUMN_GROUP, timer.group());
+        cv.put(COLUMN_END_TIME, timer.endTime());
+        cv.put(COLUMN_PAUSE_TIME, timer.pauseTime());
+        return cv;
+    }
+
+    @Override
+    protected String getQuerySortOrder() {
+        return SORT_ORDER;
+    }
+
+    private TimerCursor wrapInTimerCursor(Cursor c) {
+        return new TimerCursor(c);
+    }
+
+    public static class TimerCursor extends BaseItemCursor<Timer> {
+
+        public TimerCursor(Cursor cursor) {
+            super(cursor);
+        }
+
+        @Override
+        public Timer getItem() {
+            if (isBeforeFirst() || isAfterLast())
+                return null;
+            int hour = getInt(getColumnIndexOrThrow(COLUMN_HOUR));
+            int minute = getInt(getColumnIndexOrThrow(COLUMN_MINUTE));
+            int second = getInt(getColumnIndexOrThrow(COLUMN_SECOND));
+            String label = getString(getColumnIndexOrThrow(COLUMN_LABEL));
+//            String group = getString(getColumnIndexOrThrow(COLUMN_GROUP));
+            Timer t = Timer.create(hour, minute, second, label, /*group*/"");
+            t.setEndTime(getInt(getColumnIndexOrThrow(COLUMN_END_TIME)));
+            t.setPauseTime(getInt(getColumnIndexOrThrow(COLUMN_PAUSE_TIME)));
+            return t;
+        }
+    }
+}

app/src/main/java/com/philliphsu/clock2/model/TimersListCursorLoader.java

@@ -0,0 +1,20 @@
+package com.philliphsu.clock2.model;
+
+import android.content.Context;
+
+import com.philliphsu.clock2.Timer;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ */
+public class TimersListCursorLoader extends NewSQLiteCursorLoader<Timer, TimerDatabaseHelper.TimerCursor> {
+
+    public TimersListCursorLoader(Context context) {
+        super(context);
+    }
+
+    @Override
+    protected TimerDatabaseHelper.TimerCursor loadCursor() {
+        return new TimerDatabaseHelper(getContext()).queryItems();
+    }
+}

app/src/main/java/com/philliphsu/clock2/timers/TimersCursorAdapter.java

@@ -0,0 +1,23 @@
+package com.philliphsu.clock2.timers;
+
+import android.view.ViewGroup;
+
+import com.philliphsu.clock2.BaseCursorAdapter;
+import com.philliphsu.clock2.OnListItemInteractionListener;
+import com.philliphsu.clock2.Timer;
+import com.philliphsu.clock2.model.TimerDatabaseHelper;
+
+/**
+ * Created by Phillip Hsu on 7/29/2016.
+ */
+public class TimersCursorAdapter extends BaseCursorAdapter<Timer, TimerViewHolder, TimerDatabaseHelper.TimerCursor> {
+
+    public TimersCursorAdapter(OnListItemInteractionListener<Timer> listener) {
+        super(listener);
+    }
+
+    @Override
+    protected TimerViewHolder onCreateViewHolder(ViewGroup parent, OnListItemInteractionListener<Timer> listener) {
+        return new TimerViewHolder(parent, listener);
+    }
+}

app/src/main/java/com/philliphsu/clock2/timers/TimersFragment.java

@@ -3,52 +3,52 @@ package com.philliphsu.clock2.timers;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v4.app.Fragment;
+import android.support.v4.content.Loader;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
 
-import com.philliphsu.clock2.OnListItemInteractionListener;
+import com.philliphsu.clock2.RecyclerViewFragment;
-import com.philliphsu.clock2.R;
 import com.philliphsu.clock2.Timer;
 import com.philliphsu.clock2.edittimer.EditTimerActivity;
-import com.philliphsu.clock2.timers.dummy.DummyContent;
+import com.philliphsu.clock2.model.TimerDatabaseHelper;
-
+import com.philliphsu.clock2.model.TimersListCursorLoader;
-import butterknife.ButterKnife;
-
-/**
- * TODO: Extend from RecyclerViewFragment.
- */
-public class TimersFragment extends Fragment {
-
-    public TimersFragment() {
-        // Required empty public constructor
-    }
 
+public class TimersFragment extends RecyclerViewFragment<
+        Timer,
+        TimerViewHolder,
+        TimerDatabaseHelper.TimerCursor,
+        TimersCursorAdapter> {
+    public static final int REQUEST_CREATE_TIMER = 0;
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
-                             Bundle savedInstanceState) {
+//        if (resultCode != Activity.RESULT_OK || data == null)
-        View view = inflater.inflate(R.layout.fragment_alarms, container, false);
+//            return;
-        ButterKnife.bind(this, view);
+        TimerDatabaseHelper db = new TimerDatabaseHelper(getActivity());
-
+        db.insertItem(Timer.create(1, 0, 0));
-        RecyclerView rv = ButterKnife.findById(view, R.id.list);
-        rv.setLayoutManager(new LinearLayoutManager(getActivity()));
-        rv.setAdapter(new TimerAdapter(DummyContent.ITEMS, new OnListItemInteractionListener<Timer>() {
-            @Override
-            public void onListItemClick(Timer item) {
-                startActivity(new Intent(getActivity(), EditTimerActivity.class));
-            }
-
-            @Override
-            public void onListItemDeleted(Timer item) {
-
-            }
-        }));
-
-        return view;
     }
 
+    @Override
+    public void onFabClick() {
+        Intent intent = new Intent(getActivity(), EditTimerActivity.class);
+        startActivityForResult(intent, REQUEST_CREATE_TIMER);
+    }
+
+    @Override
+    protected TimersCursorAdapter getAdapter() {
+        return new TimersCursorAdapter(this);
+    }
+
+    @Override
+    public Loader<TimerDatabaseHelper.TimerCursor> onCreateLoader(int id, Bundle args) {
+        return new TimersListCursorLoader(getActivity());
+    }
+
+    @Override
+    public void onListItemClick(Timer item) {
+
+    }
+
+    @Override
+    public void onListItemDeleted(Timer item) {
+
+    }
 }

app/src/main/res/values/strings.xml

@@ -190,5 +190,5 @@
     </string>
 
     <!-- TODO: Remove or change this placeholder text -->
-    <string name="hello_blank_fragment">Hello blank fragment</string>
+    <string name="title_activity_create_timer">CreateTimerActivity</string>
 </resources>