App in android for random quote generation

the class data helper establishes connection with database code generator inserts the quotes with keywords in database randomcodes class toasts the random quote

import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class RandomCodes extends  ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        String[] category = getResources().getStringArray(R.array.category_array);
     setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, category));

     final ListView lv = getListView();
     lv.setTextFilterEnabled(true);
    
     lv.setOnItemClickListener(new OnItemClickListener() {
    @Override
       public void onItemClick(AdapterView<?> parent, View view,
           int position, long id) {
         // When clicked, show a toast with the TextView text
        // Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
         //Toast.LENGTH_SHORT).show();
       
       Intent switchIntent= new Intent(getBaseContext(),CodeGenerator.class);
      
     switchIntent.putExtra("myKey",((TextView) view).getText().toString());
     
     startActivity(switchIntent);
     
     
       }
     });
   // Button random=(Button)findViewById(R.id.Button01);
    
    
    }
}



import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class CodeGenerator extends Activity {
 private Datahelper dh;
 private TextView output;
 String category;
 String quote; 
  @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.db);
         this.output = (TextView) this.findViewById(R.id.out_text);
          System.out.println("hello");
         this.dh = new Datahelper(this);
         this.dh.deleteAll();
         this.dh.insert("Fortune and love favor the brave.","Miscellinious");
         this.dh.insert("Honesty is the best policy.","Honesty");
         this.dh.insert("Work is worship.","Wisdom");
         this.dh.insert("Health is Wealth","Health");
         this.dh.insert("The value of achievement lies in the achieving.---Albert Einstien","FamousPersonalities");
         this.dh.insert("If I loved you less, I might be able to talk about it more.","Love");
         this.dh.insert("Friendship is most beautiful thing in life","Friendship");
         this.dh.insert("If it's very painful for you to criticize your friends - you're safe in doing it. But if you take the slightest pleasure in it, that's the time to hold your tongue","Wisdom");
         this.dh.insert("Without hard work, nothing grows but weeds","Hardwork");
         this.dh.insert("We must become the change we want to see","Wisdom");
         this.dh.insert("A man's moral worth is not measured by what his religious beliefs are but rather by what emotional impulses he has received from Nature during his lifetime","Religious");
         this.dh.insert("Dream is some thing what we dont see in sleep it is something that does allow u to sleep.---APJ Abdul Kalam","FamousPersonalities");
         Bundle extras = getIntent().getExtras();
         category= extras.getString("myKey");
        System.out.println(category+"=================");
         
         List<String> names = this.dh.selectAll(quote,category);
          StringBuilder sb = new StringBuilder();
          
          sb.append("" +
            "The available quotes in category are:: nn");
          for (String name : names) {
             sb.append(name +"nn");
          }
           System.out.println("output of sb   ---->"+sb);
          Log.d("EXAMPLE", "names size - " + names.size());
           
          this.output.setText(sb.toString());
           
      }
 
}



import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.util.Log;
 
import java.util.ArrayList;
import java.util.List;
 
public class Datahelper {
 
   private static final String DATABASE_NAME = "codes_391184_new.db";
   private static final int DATABASE_VERSION = 1;
   private static final String