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Sq-Lite and ListView(II) - 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 CursorAdapter (To perform Edit, Delete from list)



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

Check it in previous tutorial Sq-Lite and ListView(I)

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

Check it in previous tutorial Sq-Lite and ListView(I)

 Add the delete query in DBUtil

   public int deltask(String pid) {
      return sqliteDb.delete(DBHelper.TODO_TABLE,
         DBHelper.ROW_ID_FIELD + "='" + pid
               + "'", null);

Then create the activities

First Screen

MainActivity.java


public class MainActivity extends AppCompatActivity implements
View.OnClickListener,MyCustomAdapter.Staffinterface{


    Button btn1;

    ListView listview;

    private MyCustomAdapter  dataAdapter;

    DBUtil dbUtil;

    Context context;

    @Override

    protected void onCreate(Bundle
savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        context=this;


        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();


            dataAdapter = new MyCustomAdapter(context,cur,MainActivity.this);

            listview.setAdapter(dataAdapter);

            Log.e("COUNT9",""+c);

        } 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 ;
        }
    }

    public void staffdelete(final String pid) {

        Log.e("row id ",""+pid);

        //here call delete query then call setlist();

        dbUtil.deltask(pid);

        setlist();

    }
}

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>



MyCustomAdapter.java


public class MyCustomAdapter extends CursorAdapter {

    private LayoutInflater mInflater;

    private Staffinterface staffinter;



    public MyCustomAdapter(Context context, Cursor c, Staffinterface staffinter) {

        super(context, c);

        this.staffinter=staffinter;

        mInflater = LayoutInflater.from(context);


    }


    @Override

    public void bindView(final View arg0, Context arg1, Cursor arg2) {

        ViewHolder viewHolder = (ViewHolder) arg0.getTag();


        if (viewHolder == null) {

            viewHolder = new ViewHolder();

            viewHolder.tvName = (TextView) arg0.findViewById(R.id.textView1);

            viewHolder.tvFamily = (TextView) arg0.findViewById(R.id.textView2);

            viewHolder.btndelete=(Button) arg0.findViewById(R.id.btndelid);


            viewHolder.rid = arg2.getString(arg2

                    .getColumnIndexOrThrow(DBHelper.ROW_ID_FIELD));

            viewHolder.task = arg2.getString(arg2

                    .getColumnIndexOrThrow(DBHelper.TASK_FIELD));

            arg0.setTag(viewHolder);

        }



        final String rid = arg2.getString(arg2

                .getColumnIndexOrThrow(DBHelper.ROW_ID_FIELD));

        String tk = arg2.getString(arg2

                .getColumnIndexOrThrow(DBHelper.TASK_FIELD));



        viewHolder.tvName.setText(rid);

        viewHolder.tvFamily.setText(tk);

        viewHolder.btndelete.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                View vv = (View) v.getParent();

                TextView tvName = (TextView) vv.findViewById(R.id.textView1);

                String vid = tvName.getText().toString();

                Log.e("vid",""+vid);

                staffinter.staffdelete(vid);

            }

        });

    }

    @Override

    public View getView(int position, View convertView,

                        ViewGroup parent) {

        final View row = super.getView(position, convertView,

                parent);

        return row;

    }

    @Override

    public View newView(Context context, Cursor cursor, ViewGroup parent) {

        View v = mInflater.inflate(R.layout.list_text_two, null);

        return v;

    }


    static class ViewHolder {

        TextView tvName;

        TextView tvFamily;

        Button btndelete;



        String rid;

        String task;

    }

    public interface Staffinterface {

        public void staffdelete(String pid);

    }

}











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>






Output Screenshots



















Source code for this application ToDoList.rar

________________________________________________________







Happy Coding...



























































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