How to create my own cotent provider in android

A content provider manages access to a central repository of data.A provider is a part of an Adnroid application,which often provides its own UI for working with the data.However,content providers are primarily intended to be used by other applications, which access the provider using a provider client object.Together,providers and provider clients offer a consistent,standard interfaceto data that also handles inter-process communication and securedata access.

This code describes the basics of the following:

• How content providers work.
• The API you use retrieve data from a content provider.
• The API you use to insert,update,or delete data in a contentprovider.
• other API features that facilitate working wiht providers.
• The following code is useful to create content provider 

• 1. package com.stallion.codingonandroid;

1. 
   
2. import android.net.Uri;
3. import android.os.Bundle;
4. import android.view.View;
5. import android.view.View.OnClickListener;
6. import android.widget.Button;
7. import android.widget.EditText;
8. import android.widget.TextView;
9. import android.app.Activity;
10. import android.content.ContentValues;
11. import android.database.Cursor;
12. 
    
13. public class UsingMyProvider extends Activity {
14. 
    
15. private Uri uri = Uri.parse("content://com.stallion.contentprovider");
16. private TextView textView;
17. private Button b1,b2;
18. private EditText e1,e2,e3;
19.     String s1,s2,s3;
20.     Cursor cursor;
22. @Override
23.     public void onCreate(Bundle savedInstanceState) {
24.         super.onCreate(savedInstanceState);
25.         setContentView(R.layout.activity_using_my_provider);
26.         textView = (TextView)findViewById(R.id.textView1);
27.         b1 = (Button)findViewById(R.id.button1);
28.         b2 = (Button)findViewById(R.id.button2);
29.         e1 = (EditText)findViewById(R.id.editText1);
30.         e2 = (EditText)findViewById(R.id.editText2);
31.         e3 = (EditText)findViewById(R.id.editText3);
32.         
33.         
34.         b1.setOnClickListener(new OnClickListener() {
36. public void onClick(View v) {
37.        s1 = e1.getText().toString();
38.        s2 = e2.getText().toString();
39.        s3 = e3.getText().toString();
40.        ContentValues values = new ContentValues();
41.        values.put("id", s1);
42.        values.put("name", s2);
43.        values.put("coarse", s3);
44.        getContentResolver().insert(uri, values);
45. }
46. });
47.         
48.         b2.setOnClickListener(new OnClickListener() {
50. public void onClick(View v) {
51. cursor = managedQuery(uri, null, null, null, null);
52. if(cursor != null || cursor.getCount() != 0){
53. textView.setText("");
54. cursor.moveToFirst();
55. do{
56. textView.append("\nId : " +cursor.getString(0));
57. textView.append("\n Name : " +cursor.getString(1));
58. textView.append("\n Course : " +cursor.getString(2));
59. }while(cursor.moveToNext());
60. }
61. }
62. });
63.     }
64. 
    
65. }