Hai im trying to Insert data into database using EditText and Button i have created. Im stuck at Activity part of the Code.I unbale to proceed how to write the Onclick action part for Button and EditText part Please help me. Im new to android

DBAdapter.java

package com.example.database1;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DBAdapter 
{
public static final String KEY_ROWID = "_id";
public static final String KEY_ISBN = "isbn";
public static final String KEY_TITLE = "title";
public static final String KEY_PUBLISHER = "publisher";    
private static final String TAG = "DBAdapter";

private static final String DATABASE_NAME = "books";
private static final String DATABASE_TABLE = "titles";
private static final int DATABASE_VERSION = 1;

private static final String DATABASE_CREATE =
    "create table titles (_id integer primary key autoincrement, "
    + "isbn text not null, title text not null, " 
    + "publisher text not null);";

private final Context context; 

private DatabaseHelper DBHelper;
private SQLiteDatabase db;

public DBAdapter(Context ctx) 
{
    this.context = ctx;
    DBHelper = new DatabaseHelper(context);
}

private static class DatabaseHelper extends SQLiteOpenHelper 
{
    DatabaseHelper(Context context) 
    {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

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

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, 
    int newVersion) 
    {
        Log.w(TAG, "Upgrading database from version " + oldVersion 
                + " to "
                + newVersion + ", which will destroy all old data");
        db.execSQL("DROP TABLE IF EXISTS titles");
        onCreate(db);
    }
}    

//---opens the database---
public DBAdapter open() throws SQLException 
{
    db = DBHelper.getWritableDatabase();
    return this;
}

//---closes the database---    
public void close() 
{
    DBHelper.close();
}

//---insert a title into the database---
public long insertTitle(String isbn, String title, String publisher) 
{
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_ISBN, isbn);
    initialValues.put(KEY_TITLE, title);
    initialValues.put(KEY_PUBLISHER, publisher);
    return db.insert(DATABASE_TABLE, null, initialValues);
}

//---deletes a particular title---
public boolean deleteTitle(long rowId) 
{
    return db.delete(DATABASE_TABLE, KEY_ROWID + 
            "=" + rowId, null) > 0;
}

//---retrieves all the titles---
public Cursor getAllTitles() 
{
    return db.query(DATABASE_TABLE, new String[] {
            KEY_ROWID, 
            KEY_ISBN,
            KEY_TITLE,
            KEY_PUBLISHER}, 
            null, 
            null, 
            null, 
            null, 
            null);
}

//---retrieves a particular title---
public Cursor getTitle(long rowId) throws SQLException 
{
    Cursor mCursor =
            db.query(true, DATABASE_TABLE, new String[] {
                    KEY_ROWID,
                    KEY_ISBN, 
                    KEY_TITLE,
                    KEY_PUBLISHER
                    }, 
                    KEY_ROWID + "=" + rowId, 
                    null,
                    null, 
                    null, 
                    null, 
                    null);
    if (mCursor != null) {
        mCursor.moveToFirst();
    }
    return mCursor;
}

//---updates a title---
public boolean updateTitle(long rowId, String isbn, 
String title, String publisher) 
{
    ContentValues args = new ContentValues();
    args.put(KEY_ISBN, isbn);
    args.put(KEY_TITLE, title);
    args.put(KEY_PUBLISHER, publisher);
    return db.update(DATABASE_TABLE, args, 
                     KEY_ROWID + "=" + rowId, null) > 0;
}

}

DatabaseActivity.java

package com.example.database1;
import android.os.Bundle;
import android.app.Activity;
import android.database.Cursor;
import android.view.Menu;
import android.widget.Toast;

public class DatabaseActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_database);
    DBAdapter db=new DBAdapter(this);
    db.open();
  } 
  }


 activity_database.xml:

 <LinearLayout 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">
 <EditText
    android:id="@+id/edit1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
 <EditText
    android:id="@+id/edit2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
 <EditText
    android:id="@+id/edit3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
  <Button 
    android:id="@+id/submit"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"  />
  </LinearLayout>