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1<?xml version="1.0" encoding="utf-8"?>
2<menu xmlns:android="http://schemas.android.com/apk/res/android"
3xmlns:app="http://schemas.android.com/apk/res-auto">
4
5<item
6    android:id="@+id/action_add_task"
7    android:icon="@drawable/add_item"
8    android:title="@string/add_task"
9    app:showAsAction="always"
10    />
11</menu>
12	
13<?xml version="1.0" encoding="utf-8"?>
14<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
15xmlns:app="http://schemas.android.com/apk/res-auto"
16android:layout_width="match_parent"
17android:layout_height="match_parent"
18android:layout_gravity="center_vertical">
19
20<TextView
21    android:id="@+id/task_title"
22    android:layout_width="wrap_content"
23    android:layout_height="wrap_content"
24    android:layout_alignParentLeft="true"
25    android:layout_alignParentStart="true"
26    android:text="@string/hi"
27    android:textSize="20sp" />
28
29
30
31
32    <Button
33    android:id="@+id/task_delete"
34    android:layout_width="wrap_content"
35    android:layout_height="wrap_content"
36    android:layout_alignParentEnd="true"
37    android:layout_alignParentRight="true"
38    android:onClick="deleteTask"
39    android:text="@string/done" />
40
41</RelativeLayout>
42	
43<?xml version="1.0" encoding="utf-8"?>
44<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
45xmlns:app="http://schemas.android.com/apk/res-auto"
46xmlns:tools="http://schemas.android.com/tools"
47android:layout_width="match_parent"
48android:layout_height="match_parent"
49tools:context=".MainActivity">
50
51<ListView
52    android:id="@+id/list_todo"
53    android:layout_width="wrap_content"
54    android:layout_height="wrap_content">
55
56</ListView>
57
58<Button
59
60android:id="@+id/btnAdd"
61android:layout_width="65dp"
62android:layout_height="65dp"
63android:layout_alignParentBottom="true"
64android:layout_alignParentRight="true"
65android:layout_margin="20dp"
66android:background="@drawable/circle"
67/>   
68
69</RelativeLayout>
70	
71import android.content.ContentValues;
72import android.content.DialogInterface;
73import android.database.Cursor;
74import android.database.sqlite.SQLiteDatabase;
75
76import android.support.v7.app.AlertDialog;
77import android.support.v7.app.AppCompatActivity;
78import android.os.Bundle;
79import android.view.Menu;
80
81import android.view.MenuItem;
82import android.view.View;
83import android.widget.ArrayAdapter;
84import android.widget.Button;
85import android.widget.EditText;
86import android.widget.ListView;
87import android.widget.TextView;
88
89
90
91import java.util.ArrayList;
92
93public class MainActivity extends AppCompatActivity {
94
95private static final String TAG = "MainActivity";
96private TaskHelper mHelper;
97private ListView mTaskListView;
98private ArrayAdapter<String> mAdapter;
99Button btnAdd;
100
101@Override
102protected void onCreate(Bundle savedInstanceState) {
103    super.onCreate(savedInstanceState);
104    setContentView(R.layout.activity_main);
105
106    mHelper = new TaskHelper(this);
107    mTaskListView = (ListView) findViewById(R.id.list_todo);
108    btnAdd = (Button) findViewById(R.id.btnAdd);
109
110    updateUI();
111}
112
113
114@Override
115public boolean onCreateOptionsMenu(Menu menu) {
116    getMenuInflater().inflate(R.menu.main_menu, menu);
117    return super.onCreateOptionsMenu(menu);
118
119}
120
121@Override
122public boolean onOptionsItemSelected(MenuItem item) {
123    switch (item.getItemId()) {
124        case R.id.action_add_task:
125            final EditText taskEditText = new EditText(this);
126            AlertDialog dialog = new AlertDialog.Builder(this)
127                    .setTitle("New Task")
128                    .setMessage("Add a new task")
129                    .setView(taskEditText)
130                    .setPositiveButton("Add", new ` 
131   DialogInterface.OnClickListener() {`
132                        @Override
133                        public void onClick(DialogInterface dialog, int ` 
134     which) {`
135                        String task = 
136     String.valueOf(taskEditText.getText());
137                        SQLiteDatabase db = mHelper.getWritableDatabase();
138                            ContentValues values = new ContentValues();
139                            values.put(Task.TaskEntry.COL_TASK_TITLE, task);
140                            db.insertWithOnConflict(Task.TaskEntry.TABLE, 
141   null, values, SQLiteDatabase.CONFLICT_REPLACE);
142                            db.close();
143                            updateUI();
144
145                        }
146                    })
147
148                    .setNegativeButton("Cancel", null)
149                    .create();
150            dialog.show();
151            return true;
152
153        default:
154            return super.onOptionsItemSelected(item);
155
156       }
157    }
158
159
160   private void updateUI() {
161
162    ArrayList<String> taskList = new ArrayList<>();
163    SQLiteDatabase db = mHelper.getReadableDatabase();
164    Cursor cursor = db.query(Task.TaskEntry.TABLE,
165            new String[] {Task.TaskEntry._ID, 
166    Task.TaskEntry.COL_TASK_TITLE}, null, null, null, null, null);
167    while (cursor.moveToNext()) {
168        int index = cursor.getColumnIndex(Task.TaskEntry.COL_TASK_TITLE);
169        taskList.add(cursor.getString(index));
170    }
171
172    if (mAdapter == null) {
173        mAdapter = new ArrayAdapter<>(this, R.layout.item_todo, 
174 R.id.task_title, taskList);
175        mTaskListView.setAdapter(mAdapter);
176    } else {
177        mAdapter.clear();
178        mAdapter.addAll(taskList);
179        mAdapter.notifyDataSetChanged();
180
181    }
182
183    cursor.close();
184    db.close();
185}
186
187public void deleteTask(View view) {
188    View parent = (View) view.getParent();
189    TextView taskTextView = (TextView) parent.findViewById(R.id.task_title);
190    String task = String.valueOf(taskTextView.getText());
191    SQLiteDatabase db = mHelper.getWritableDatabase();
192    db.delete(Task.TaskEntry.TABLE, Task.TaskEntry.COL_TASK_TITLE + " = ?", 
193new String[]{task});
194    db.close();
195    updateUI();
196}
197
198
199}
200	
201package com.kentforth.list5;
202
203import android.provider.BaseColumns;
204
205public class Task {
206
207    public static final String DB_NAME = "ToDoDB";
208    public static final int DB_VERSION = 1;
209
210    public class TaskEntry implements BaseColumns {
211    public static final String TABLE = "tasks";
212    public static final String COL_TASK_TITLE = "title";
213      }
214
215   }
216	
217package com.kentforth.list5;
218
219import android.content.Context;
220import android.database.sqlite.SQLiteDatabase;
221import android.database.sqlite.SQLiteOpenHelper;
222
223public class TaskHelper extends SQLiteOpenHelper{
224
225public TaskHelper(Context context) {
226    super(context, Task.DB_NAME, null, Task.DB_VERSION);
227}
228
229@Override
230public void onCreate(SQLiteDatabase db) {
231String createTable = "CREATE TABLE " + Task.TaskEntry.TABLE + " ( " +
232                                   Task.TaskEntry._ID + " INTEGER PRIMARY 
233KEY AUTOINCREMENT, " +
234                                   Task.TaskEntry.COL_TASK_TITLE + " TEXT 
235NOT NULL);";
236    db.execSQL(createTable);
237}
238
239@Override
240public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
241    db.execSQL("DROP TABLE IF EXISTS" + Task.TaskEntry.TABLE);
242    onCreate(db);
243   }
244
245}
246	
247@Override
248   protected void onCreate(Bundle savedInstanceState) {
249   super.onCreate(savedInstanceState);
250   setContentView(R.layout.activity_main);
251
252   mHelper = new TaskHelper(this);
253   mTaskListView = (ListView) findViewById(R.id.list_todo);
254   btnAdd = (Button) findViewById(R.id.btnAdd);
255   btnAdd.setOnClickListener(new View.OnClickListener() {
256        @Override
257        public void onClick(View v) {
258            addTask();
259        }
260   });
261   updateUI();
262}
263	
264private void addTask(){
265final EditText taskEditText = new EditText(this);
266        AlertDialog dialog = new AlertDialog.Builder(this)...
267   // и так далее
268 .create();
269 dialog.show();
270}