how to insert android textfield values to mysql table using json

i'm totally new to android.i have android app with two text fields and one submit button and also i create database in my serverside using phpmyadmin.what i want to do is, when user submit those two values it's should be insert to server side table.

DB name : test | table name : student | table fields : id,uname

-main activity oncreate-

btn = (Button) findViewById(R.id.button1);
         mEDitTxt = (EditText) findViewById(R.id.editText1);
         mEDitTxt2 = (EditText) findViewById(R.id.EditText02); 



         btn.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    String Id=mEDitTxt.getText().toString();
                    String Unm=mEDitTxt2.getText().toString();

                    insertconfig(Id, Unm);

                }
            });

i have this code.but i don't know how to bind those functions and how i connect with webserver and database.i don't know below codes are need for this or not.please help me

-DBAdapter-

public class DBAdapter 
{
    private static final String DATABASE_CONFIGTABLE = "student";
    public static final String KEY_KEY = "id";
    public static final String KEY_VALUE= "uname";

    SQLiteDatabase mDb;
    Context mCtx;
    DBHelper mDbHelper;

    public DBAdapter(Context context)
    {
        this.mCtx = context;
    }

    public DBAdapter open() throws SQLException
    {
        mDbHelper = new DBHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }

    public void close()
    {
        mDbHelper.close();
    }


    public long insertconfig(String Id,String Unm)
    {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_KEY, Id);
        initialValues.put(KEY_VALUE, Unm);

        return mDb.insert(DATABASE_CONFIGTABLE, null, initialValues);
    }

}

-DBHelper-

public class DBHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "SAMPLE.db";
    private static final int DATABASE_VERSION = 1;



    private static final String DATABASE_CONFIGTABLE = "student";
    public static final String KEY_KEY = "id";
    public static final String KEY_VALUE= "uname";



    private static final String DATABASECONFIG_CREATE = "CREATE TABLE "+DATABASE_CONFIGTABLE+"  ("+KEY_KEY+" varchar,"+KEY_VALUE+" varchar);";

    Context c;
    SQLiteDatabase db;

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

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL(DATABASECONFIG_CREATE);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {


        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_CONFIGTABLE);

        onCreate(db);

    }


}