ListView loading is now done using AsyncTask with 0.5 sec delay

Author: mickey946

TodoListManager/bin/TodoListManager.apk

@@ -2,10 +2,15 @@
 
 import il.ac.huji.todolist.ActionTaskDialog.DeleteTaskDialogListener;
 
+import java.util.ArrayList;
 import java.util.Date;
 
 //import com.parse.Parse;
 
+
+
+
+
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
@@ -31,40 +36,80 @@
  */
 public class TodoListManagerActivity extends Activity implements DeleteTaskDialogListener {
 
-	private TodoTaskCursorAdapter _adapter;
+	//	private TodoTaskCursorAdapter _adapter;
+	private TodoTaskArrayAdapter _adapter;
 	private TodoTaskSQLiteHelper _helper;
 	private ActionTaskDialog _actionTaskDialog;
 	private ListView _listToDoTask;
 
-	private class TodoTaskSaver extends AsyncTask<TodoTask, Void, Void> {
+	private class TodoTaskSaver extends AsyncTask<TodoTask, Void, TodoTask[]> {
 
 		@Override
-		protected Void doInBackground(TodoTask... tasks) {
+		protected TodoTask[] doInBackground(TodoTask... tasks) {
 			for(TodoTask task : tasks) {
-				_helper.addTask(task);
+				Long id = _helper.addTask(task);
+				task.setID(id);
 			}
-			return null;
+			return tasks;
+		}
+
+		@Override
+		protected void onPostExecute(TodoTask[] tasks) {
+			for (TodoTask task : tasks)
+				_adapter.add(task);
+			_adapter.notifyDataSetChanged();
+		}
+
+	}
+
+	private class TodoTaskDeleter extends AsyncTask<TodoTask, Void, TodoTask[]> {
+
+		@Override
+		protected TodoTask[] doInBackground(TodoTask... tasks) {
+			for (TodoTask task : tasks) {
+				_helper.deleteTask(task.getID());
+			}
+			return tasks;
 		}
 
 		@Override
-		protected void onPostExecute(Void nothing) {
-			_adapter.changeCursor(_helper.getAllTasks());	
+		protected void onPostExecute(TodoTask[] tasks) {
+			for (TodoTask task : tasks)
+				_adapter.remove(task);
+			_adapter.notifyDataSetChanged();	
 		}
+
 	}
 
-	private class TodoTaskDeleter extends AsyncTask<Integer, Void, Void> {
+	private class TodoTaskLoader extends AsyncTask<Cursor, TodoTask, Void> {
 
 		@Override
-		protected Void doInBackground(Integer... positions) {
-			for (Integer pos : positions) {
-				_helper.deleteTask(pos);
+		protected Void doInBackground(Cursor... cursors) {
+			Cursor current = cursors[0];
+			while (current.moveToNext()) {
+				Long id = current.getLong(current.getColumnIndex(TodoTaskSQLiteHelper.COLUMN_ID));
+				Long due = current.getLong(current.getColumnIndex(TodoTaskSQLiteHelper.COLUMN_DUE));
+				String title = current.getString(current.getColumnIndex(TodoTaskSQLiteHelper.COLUMN_TITLE));
+
+				TodoTask task = new TodoTask(id, title, due);
+
+				try {
+					Thread.sleep(500);
+				} catch (InterruptedException e) { 
+					// well, shit
+				}
+
+				publishProgress(task);
 			}
 			return null;
 		}
 
 		@Override
-		protected void onPostExecute(Void nothing) {
-			_adapter.changeCursor(_helper.getAllTasks());	
+		protected void onProgressUpdate(TodoTask... tasks) {
+			for (TodoTask task : tasks){
+				_adapter.add(task);
+			}
+			_adapter.notifyDataSetChanged();
 		}
 
 	}
@@ -81,13 +126,16 @@ protected void onCreate(Bundle savedInstanceState) {
 
 		_listToDoTask = (ListView) findViewById(R.id.list_todo_tasks);
 
+		_adapter = new TodoTaskArrayAdapter(getApplicationContext(), 
+				new ArrayList<TodoTask>());
+		_listToDoTask.setAdapter(_adapter);
+
 		new Handler().post(new Runnable() {
 
 			@Override
 			public void run() {	
-				_adapter = new TodoTaskCursorAdapter(TodoListManagerActivity.this, 
-						_helper.getAllTasks());
-				_listToDoTask.setAdapter(_adapter);
+				TodoTaskLoader loader = new TodoTaskLoader();
+				loader.execute(_helper.getAllTasks());
 			}
 
 		});
@@ -97,9 +145,8 @@ public void run() {
 			@TargetApi(Build.VERSION_CODES.HONEYCOMB)
 			@SuppressLint("NewApi")
 			public boolean onItemLongClick(AdapterView<?> parent, View child, int pos, long id) {
-				Cursor current = (Cursor)_adapter.getItem(pos);
-				_actionTaskDialog = new ActionTaskDialog(current.getInt(0), 
-						new TodoTask(current.getString(1)));
+				TodoTask task = _adapter.getItem(pos);
+				_actionTaskDialog = new ActionTaskDialog(pos, task);
 				_actionTaskDialog.show(getFragmentManager(), "actionTask");
 				return true;
 			}
@@ -153,7 +200,8 @@ protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 	@Override
 	public void onDialogPositiveClick(ActionTaskDialog dialog) {
 		TodoTaskDeleter deleter = new TodoTaskDeleter();
-		deleter.execute(dialog.getPos());
+		TodoTask task = _adapter.getItem(dialog.getPos());
+		deleter.execute(task);
 	}
 
 	@Override

TodoListManager/bin/classes.dex

@@ -2,14 +2,14 @@
 
 public class TodoTask {
 
-	private int _id;
+	private Long _id;
 	private String _title;
 	private long _due;
 
 	public TodoTask() {
 	}
 
-	public TodoTask(int id, String title, long due) {
+	public TodoTask(Long id, String title, long due) {
 		this._id = id;
 		this._title = title;
 		this._due = due;
@@ -24,11 +24,11 @@ public TodoTask(String title) {
 		this._title = title;
 	}
 
-	public int getID() {
+	public Long getID() {
 		return _id;
 	}
 
-	public void setID(int id) {
+	public void setID(Long id) {
 		this._id = id;
 	}
 

TodoListManager/bin/classes/il/ac/huji/todolist/TodoListManagerActivity$1.class

@@ -0,0 +1,71 @@
+package il.ac.huji.todolist;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+import android.content.Context;   
+import android.graphics.Color;  
+import android.text.format.DateFormat;
+import android.view.LayoutInflater;
+import android.view.View;  
+import android.view.ViewGroup;  
+import android.widget.ArrayAdapter;
+import android.widget.TextView;
+
+/**
+ * A custom array adapter for presenting the list with alternating color text.
+ * 
+ * @author mickey
+ */
+public class TodoTaskArrayAdapter extends ArrayAdapter<TodoTask>{  
+
+	private ArrayList<TodoTask> _listItems;
+	private int _layout;
+
+	public TodoTaskArrayAdapter(Context context, ArrayList<TodoTask> listItems) {  
+		super(context, R.layout.todo_task, listItems);
+		_layout = R.layout.todo_task;
+		_listItems = listItems;
+	}
+
+	/** 
+	 * Display rows in alternating colors 
+	 */  
+	@Override  
+	public View getView(int position, View convertView, ViewGroup parent) {  
+		LayoutInflater inflater = LayoutInflater.from(getContext());
+
+		if (convertView == null) { // new row
+			convertView = inflater.inflate(_layout, parent, false);
+		}
+
+		TextView taskTitle = (TextView)convertView.findViewById(R.id.txtTodoTitle);
+		taskTitle.setText(_listItems.get(position).getTitle());
+
+		TextView taskDueDate = (TextView)convertView.findViewById(R.id.txtTodoDueDate);
+
+		Long today = System.currentTimeMillis(), taskDue = _listItems.get(position).getDue();
+
+		if (taskDue == null) { // should not happen
+			taskDueDate.setText(getContext().getResources().getString(R.string.no_due_date));
+		}
+		else {
+			Date date = new Date(); 
+			date.setTime(taskDue);
+			String dueDate = DateFormat.getDateFormat(getContext()).format(date);
+			taskDueDate.setText(dueDate);
+		}
+
+
+		if (today - taskDue > 0) { // over due
+			taskTitle.setTextColor(Color.RED);
+			taskDueDate.setTextColor(Color.RED);
+		}
+		else {
+			taskTitle.setTextColor(Color.BLACK);
+			taskDueDate.setTextColor(Color.BLACK);
+		}
+
+		return convertView;  
+	}  
+}  

TodoListManager/bin/classes/il/ac/huji/todolist/TodoListManagerActivity$2.class

@@ -20,9 +20,9 @@ public class TodoTaskSQLiteHelper extends SQLiteOpenHelper {
 	private static TodoTaskSQLiteHelper _instanse;
 
 	private static final String TABLE_TASKS = "todo_tasks";
-	private static final String COLUMN_ID = "_id";
-	private static final String COLUMN_TITLE = "title";
-	private static final String COLUMN_DUE = "due";
+	static final String COLUMN_ID = "_id";
+	static final String COLUMN_TITLE = "title";
+	static final String COLUMN_DUE = "due";
 
 	private static final String DATABASE_NAME = "todo_db";
 	private static final int DATABASE_VERSION = 1;
@@ -94,15 +94,15 @@ public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 	 * A a new task to the database.
 	 * @param task The task to add.
 	 */
-	public void addTask(TodoTask task) {
+	public Long addTask(TodoTask task) {
 		// inserting row to local database
 		SQLiteDatabase db = this.getWritableDatabase();
 
 		final ContentValues values = new ContentValues();
 		values.put(COLUMN_TITLE, task.getTitle()); // task title
 		values.put(COLUMN_DUE, task.getDue()); // task due
 
-		db.insert(TABLE_TASKS, null, values);
+		Long id = db.insert(TABLE_TASKS, null, values);
 		db.close(); // closing database connection
 
 		// insert row to Parse database
@@ -128,14 +128,15 @@ public void addTask(TodoTask task) {
 
 		Log.i(TodoTaskSQLiteHelper.class.getName(),
 				"Inserting new task: " + task.getTitle() + " due: " + task.getDue());
+		return id;
 	}
 
 	/**
 	 * Get a task with an id.
 	 * @param id The id of the task as it appears in the database.
 	 * @return The TodoTask with the corresponding id.
 	 */
-	public TodoTask getTask(int id) {
+	public TodoTask getTask(long id) {
 		SQLiteDatabase db = this.getReadableDatabase();
 
 		Cursor cursor = db.query(
@@ -148,7 +149,7 @@ public TodoTask getTask(int id) {
 			cursor.moveToFirst();
 
 		return new TodoTask(
-				cursor.getInt(0), // id
+				cursor.getLong(0), // id
 				cursor.getString(1), // title
 				cursor.getLong(2) // due date
 				);
@@ -170,7 +171,7 @@ public Cursor getAllTasks() {
 	 * Delete a task with an id.
 	 * @param id The id of the task as it appears in the database.
 	 */
-	public void deleteTask(int id) {
+	public void deleteTask(long id) {
 		SQLiteDatabase db = this.getWritableDatabase();
 
 		db.delete(TABLE_TASKS, COLUMN_ID + " = ?",