Add edit and delete functionality

* res/values/strings.xml: Add strings for `main_context_menu_edit' and
  `main_context_menu_delete'.

* src/ryuslash/org/dvdroid/AddDVDActivity.java (saveDVD): Renamed from
  `createDVD'.  When ID is greater than 0 update, otherwise create.

  (onCreate): Get ID from the `Intent' that was used to start this
  activity.  If ID is greater than 0, show known information in the
  inputs.

* src/ryuslash/org/dvdroid/DVDDataSource.java:
  (createValues):
  (updateDVD):
  (getById): New functions.

  (createDVD): Use `createValues' to get the values for the database.

  (deleteDVD): Add overloaded function that takes a `long', make the
  original function use this to delete a `DVD'.

* src/ryuslash/org/dvdroid/DVDroidActivity.java: Implement
  `ActionMode.Callback'.

  (onActivityResult): If REQUESTCODE is `2' reset the intent
  information so as not to confuse it during its next invocation.
  Finish action mode.

  (onActionItemClicked):
  (onCreateActionMode):
  (onDestroyActionMode):
  (onListItemClick):
  (onPrepareActionMode):
  (reloadList):
  (showEditDVD): New functions.

  (onCreate): Instantiate the ADD_DVD `Intent'.

res/menu/main_context_menu.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:id="@+id/main_context_menu_edit"
+        android:title="@string/main_context_menu_edit"
+        android:showAsAction="ifRoom|withText"
+        android:icon="@drawable/edit" />
+  <item android:id="@+id/main_context_menu_delete"
+        android:title="@string/main_context_menu_delete"
+        android:showAsAction="ifRoom|withText"
+        android:icon="@drawable/delete" />
+</menu>

res/values/strings.xml

@@ -6,4 +6,6 @@
   <string name="watched_entry">Watched</string>
   <string name="main_menu_add">Add</string>
   <string name="add_menu_save">Save</string>
+  <string name="main_context_menu_edit">Edit</string>
+  <string name="main_context_menu_delete">Delete</string>
 </resources>

src/ryuslash/org/dvdroid/AddDVDActivity.java

@@ -13,8 +13,9 @@ import android.widget.EditText;
 public class AddDVDActivity extends Activity
 {
     private DVDDataSource datasource;
+    private long id;
 
-    public void createDVD()
+    public void saveDVD()
     {
         EditText name_entry = (EditText)findViewById(R.id.name_entry);
         CheckBox watched_entry =
@@ -22,10 +23,16 @@ public class AddDVDActivity extends Activity
         CheckBox wishlist_entry =
             (CheckBox)findViewById(R.id.wishlist_entry);
 
+        if (id > 0) {
+            datasource.updateDVD(id, name_entry.getText().toString(),
+                                 watched_entry.isChecked() ? 1 : 0,
+                                 wishlist_entry.isChecked() ? 1 : 0);
+        } else {
             datasource.createDVD(name_entry.getText().toString(),
                                  watched_entry.isChecked() ? 1 : 0,
                                  wishlist_entry.isChecked() ? 1 : 0);
         }
+    }
 
     @Override
     public void onCreate(Bundle savedInstanceState)
@@ -35,6 +42,23 @@ public class AddDVDActivity extends Activity
 
         datasource = new DVDDataSource(this);
         datasource.open();
+
+        Intent intent = getIntent();
+        id = intent.getLongExtra(SQLiteHelper.COLUMN_ID, 0l);
+
+        if (id > 0) {
+            DVD dvd = datasource.getById(id);
+            EditText name_entry =
+                (EditText) findViewById(R.id.name_entry);
+            CheckBox watched_entry =
+                (CheckBox) findViewById(R.id.watched_entry);
+            CheckBox wishlist_entry =
+                (CheckBox) findViewById(R.id.wishlist_entry);
+
+            name_entry.setText(dvd.getTitle());
+            watched_entry.setChecked(dvd.getWatched() == 1);
+            wishlist_entry.setChecked(dvd.getWishlist() == 1);
+        }
     }
 
     @Override
@@ -57,7 +81,7 @@ public class AddDVDActivity extends Activity
     {
         switch (item.getItemId()) {
         case R.id.add_menu_save:
-            createDVD();
+            saveDVD();
             finish();
             return true;
         }

src/ryuslash/org/dvdroid/DVDDataSource.java

@@ -33,7 +33,8 @@ public class DVDDataSource
         dbHelper.close();
     }
 
-    public DVD createDVD(String title, int watched, int wishlist)
+    private ContentValues createValues(String title, int watched,
+                                       int wishlist)
     {
         ContentValues values = new ContentValues();
 
@@ -41,6 +42,12 @@ public class DVDDataSource
         values.put(SQLiteHelper.COLUMN_WATCHED, watched);
         values.put(SQLiteHelper.COLUMN_WISHLIST, wishlist);
 
+        return values;
+    }
+
+    public DVD createDVD(String title, int watched, int wishlist)
+    {
+        ContentValues values = createValues(title, watched, wishlist);
         long insertId = database.insert(SQLiteHelper.TABLE_DVD, null,
                                         values);
         Cursor cursor = database.query(SQLiteHelper.TABLE_DVD,
@@ -57,14 +64,42 @@ public class DVDDataSource
         return newDVD;
     }
 
+    public void updateDVD(long id, String title, int watched, int wishlist)
+    {
+        ContentValues values = createValues(title, watched, wishlist);
+        String whereArgs[] = { "" + id };
+
+        database.update(SQLiteHelper.TABLE_DVD, values, "id = ?",
+                        whereArgs);
+    }
+
     public void deleteDVD(DVD dvd)
     {
-        long id = dvd.getId();
-        System.out.println("DVD deleted with id: " + id);
+        deleteDVD(dvd.getId());
+    }
+
+    public void deleteDVD(long id)
+    {
         database.delete(SQLiteHelper.TABLE_DVD,
                         SQLiteHelper.COLUMN_ID + " = " + id, null);
     }
 
+    public DVD getById(long id)
+    {
+        Cursor cursor = database.query(SQLiteHelper.TABLE_DVD,
+                                       allColumns,
+                                       SQLiteHelper.COLUMN_ID + " = " + id,
+                                       null, null, null, null);
+
+        cursor.moveToFirst();
+
+        DVD dvd = cursorToDVD(cursor);
+
+        cursor.close();
+
+        return dvd;
+    }
+
     public List<DVD> getListFromCursor(Cursor cursor)
     {
         List<DVD> dvds = new ArrayList<DVD>();

src/ryuslash/org/dvdroid/DVDroidActivity.java

@@ -6,17 +6,22 @@ import android.app.ListActivity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.ActionMode;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.ArrayAdapter;
 import android.widget.EditText;
-import android.widget.Toast;
+import android.widget.ListView;
 
 public class DVDroidActivity extends ListActivity
+    implements ActionMode.Callback
 {
     private DVDDataSource datasource;
+    private Intent add_dvd;
+    private int saved_position = 0;
+    private ActionMode mode;
 
     private List<DVD> getData()
     {
@@ -29,14 +34,40 @@ public class DVDroidActivity extends ListActivity
                                     Intent data)
     {
         super.onActivityResult(requestCode, resultCode, data);
+
+        if (requestCode == 2) {
+            add_dvd.putExtra(SQLiteHelper.COLUMN_ID, 0l);
+
+            if (mode != null)
+                mode.finish();
+        }
+
         datasource.open();
+        reloadList();
+    }
 
+    @Override
+    public boolean onActionItemClicked(ActionMode mode, MenuItem item)
+    {
         ArrayAdapter<DVD> adapter = (ArrayAdapter<DVD>) getListAdapter();
-        List<DVD> dvds = getData();
+        DVD dvd = adapter.getItem(saved_position);
 
-        adapter.clear();
-        adapter.addAll(dvds);
-        adapter.notifyDataSetChanged();
+        switch (item.getItemId()) {
+        case R.id.main_context_menu_edit:
+            showEditDVD(dvd.getId());
+            return true;
+
+        case R.id.main_context_menu_delete:
+            datasource.deleteDVD(dvd.getId());
+            reloadList();
+
+            if (mode != null)
+                mode.finish();
+
+            return true;
+        }
+
+        return false;
     }
 
     /** Called when the activity is first created. */
@@ -56,6 +87,16 @@ public class DVDroidActivity extends ListActivity
                                   android.R.layout.simple_list_item_1,
                                   values);
         setListAdapter(adapter);
+
+        add_dvd = new Intent(this, AddDVDActivity.class);
+    }
+
+    @Override
+    public boolean onCreateActionMode(ActionMode mode, Menu menu)
+    {
+        MenuInflater inflater = mode.getMenuInflater();
+        inflater.inflate(R.menu.main_context_menu, menu);
+        return true;
     }
 
     @Override
@@ -66,6 +107,20 @@ public class DVDroidActivity extends ListActivity
         return true;
     }
 
+    @Override
+    public void onDestroyActionMode(ActionMode mode)
+    {
+        saved_position = 0;
+    }
+
+    @Override
+    public void onListItemClick(ListView l, View v, int pos, long id)
+    {
+        saved_position = pos;
+        mode = startActionMode(this);
+        v.setSelected(true);
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item)
     {
@@ -85,6 +140,12 @@ public class DVDroidActivity extends ListActivity
         super.onPause();
     }
 
+    @Override
+    public boolean onPrepareActionMode(ActionMode mode, Menu menu)
+    {
+        return false;
+    }
+
     @Override
     protected void onResume()
     {
@@ -92,11 +153,26 @@ public class DVDroidActivity extends ListActivity
         super.onResume();
     }
 
+    private void reloadList()
+    {
+        ArrayAdapter<DVD> adapter = (ArrayAdapter<DVD>)getListAdapter();
+        List<DVD> dvds = getData();
+
+        adapter.clear();
+        adapter.addAll(dvds);
+        adapter.notifyDataSetChanged();
+    }
+
     public void showAddDVD()
     {
-        Intent intent = new Intent(this, AddDVDActivity.class);
-
         datasource.close();
-        startActivityForResult(intent, 1);
+        startActivityForResult(add_dvd, 1);
+    }
+
+    public void showEditDVD(long id)
+    {
+        datasource.close();
+        add_dvd.putExtra(SQLiteHelper.COLUMN_ID, id);
+        startActivityForResult(add_dvd, 2);
     }
 }