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Sq-Lite and ListView(I) - Android Tutorial
This tutorial explain with the simple application which explains,
               - How to create sq-lite database
               - How to insert data into sq-lite database
               - How to retrieve the data from sq-lite and display it in ListView
               - Using SimpleCursorAdapter (Just to set list)


****screenshots uploaded shortly****


To create this simple application do the following:-
To create sq-lite database

Create the class with the name DBHelper with extends SQLiteOpenHelper and copy the following coding

public class DBHelper extends SQLiteOpenHelper {
   private static final int DATABASE_VERSION = 1;
   private static final String DATABASE_NAME = "todorecord.db";
   public static final String USER_NAME = "username";
   public static final String PASSWORD = "password";


   public static final String ROW_ID_FIELD = "_id";

   public static final String TASK_FIELD = "task_field";
   public static final String LOGIN_TABLE = "logintable";
   public static final String TODO_TABLE = "todotable";

   private static final String TODO_TABLE_QUERY = "CREATE TABLE "
         + TODO_TABLE +
         "(" + ROW_ID_FIELD + " integer primary key autoincrement, "
         + TASK_FIELD + " TEXT NOT NULL);";

   public DBHelper(Context context) {
      super(context, DATABASE_NAME, null, DATABASE_VERSION);
   }

   @Override
   public void onCreate(SQLiteDatabase db) {
      db.execSQL(TODO_TABLE_QUERY);

   }

   @Override
   public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
      db.execSQL("DROP TABLE IF EXISTS " + TODO_TABLE_QUERY);

      onCreate(db);
   }
}

Create the class with the name DBUtil and copy the following coding

public class DBUtil {

   public static final String[] TODO_FIELDS = {
         DBHelper.ROW_ID_FIELD,
         DBHelper.TASK_FIELD
   };

   private DBHelper dbHelper;
   private SQLiteDatabase sqliteDb;
   private ContentValues contentValues;
   private Context context;

   public DBUtil(Context context) {
      this.context = context;
      contentValues = new ContentValues();
   }
   public SQLiteDatabase open() throws SQLException {
      if (dbHelper == null) {
         dbHelper = new DBHelper(context);
      }
      sqliteDb = dbHelper.getWritableDatabase();
      return sqliteDb;
   }

   public void close() {
      if (dbHelper != null) {
         dbHelper.close();
      }
   }

   public long addtask(String stredt) {
      contentValues.clear();
      contentValues.put(DBHelper.TASK_FIELD, stredt);

      return sqliteDb.insert(DBHelper.TODO_TABLE, null, contentValues);
   }

   public Cursor getalltask() {
      return sqliteDb.query(DBHelper.TODO_TABLE, TODO_FIELDS,
            null,
            null, null, null, null, null);
   }
}

Then create the activities

First Screen

MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    Button btn1;
    ListView listview;
    private SimpleCursorAdapter dataAdapter;
    DBUtil dbUtil;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        btn1 = (Button) findViewById(R.id.btnid);
        listview = (ListView) findViewById(R.id.listid);
        btn1.setOnClickListener(this);

        dbUtil = new DBUtil(this);
        dbUtil.open();

        setlist();

    }

    private void setlist() {

        Cursor cur = dbUtil.getalltask();

        if (cur.moveToFirst() && cur != null) {
            cur.moveToLast();

            int c = cur.getCount();

            Log.e("COUNT9",""+c);

            final String[] from = new String[]{DBHelper.ROW_ID_FIELD,
                    DBHelper.TASK_FIELD};

            final int[] to = new int[]{R.id.textView1, R.id.textView2};


            dataAdapter = new SimpleCursorAdapter(
                    this, R.layout.list_text_two,
                    cur,
                    from,
                    to,
                    0);

            listview.setAdapter(dataAdapter);
        } else{
            Toast.makeText(this, "No To-Do entry", Toast.LENGTH_SHORT).show();
        }

    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.btnid: /** Start a new Activity MyCards.java */
                Intent intent = new Intent(this, AddTodo.class);
                this.startActivity(intent);
                break ;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.mrbrown.todo.MainActivity">

   <LinearLayout
       android:id="@+id/lineid"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:background="#6666ff">

       <Button
           android:id="@+id/btnid"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="ADD"
           android:layout_marginLeft="270dp"
           />
   </LinearLayout>

    <ListView
        android:id="@+id/listid"
        android:layout_below="@+id/lineid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
</ListView>
</RelativeLayout>


list_text_two.xml for ListView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="6dip" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/textView1"
            android:layout_weight="2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:visibility="gone"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/textView2"
            android:layout_weight="20"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"/>

        <Button
            android:layout_weight="2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="X"/>

    </LinearLayout>

</RelativeLayout>


Second Screen

AddTodo.java

public class AddTodo extends Activity implements View.OnClickListener{

    DBUtil dbUtil;

    EditText edt;
    Button btn2;
    String stredt;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTitle("Add Record");
        setContentView(R.layout.add_todo);

        edt = (EditText) findViewById(R.id.edtid);
        btn2 = (Button) findViewById(R.id.btn2id);
        btn2.setOnClickListener(this);

        dbUtil = new DBUtil(this);
        dbUtil.open();

    }

    @Override
    public void onClick(View v) {

        switch(v.getId()){
            case R.id.btn2id: /** Start a new Activity MyCards.java */

                stredt=edt.getText().toString();

                if(stredt.length()>0){

                    dbUtil.addtask(stredt);
                    edt.setText("");

                    Intent intent = new Intent(this, MainActivity.class);
                    this.startActivity(intent);
                }

                break;
        }
    }
}


add_todo.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.mrbrown.todo.MainActivity">

    <LinearLayout
        android:id="@+id/lineid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#6666ff">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="ADD"
            android:layout_marginLeft="150dp"
            android:textStyle="bold"
            android:textSize="30dp"/>

    </LinearLayout>

    <EditText
        android:id="@+id/edtid"
        android:layout_below="@+id/lineid"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter here..."/>

    <Button
        android:id="@+id/btn2id"
        android:layout_below="@+id/edtid"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="125dp"
        android:text="Submit"/>
</RelativeLayout>


Add WRITE_EXTERNAL_STORAGE to manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>


Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mrbrown.todo">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


        <activity android:name=".AddTodo">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

________________________________________________________

Happy Coding...



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