Content Provider提供了一种多应用间数据共享的方式，比如：联系人信息可以被多个应用程序访问。Content Provider是个实现了一组用于提供其他应用程序存取数据的标准方法的类。

下面来看一个简单的实例: MainActivity.java

package com.app.contentprovidetest;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.app.Activity;

import android.content.ContentResolver;

import android.content.ContentValues;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.provider.Contacts.People;

import android.provider.Contacts;

import android.provider.ContactsContract;

import android.provider.ContactsContract.CommonDataKinds.Phone;

import android.util.Log;

import android.view.Menu;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

public class MainActivity extends Activity {

	//声明ContentResolver对象

	private ContentResolver mContentResolver= null;

	Cursor cursor ;

	//声明联系人 Uri位置

	private Uri uri;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		//获得ContentResolver对象

		mContentResolver=getContentResolver();

		uri =ContactsContract.CommonDataKinds.Phone.CONTENT_URI;

		//cursor取数据

		//(uri地址,显示字段，查询条件，条件参数，排序)

		cursor = mContentResolver.query(uri, null, null, null, null);

		List<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();

		if(cursor.getCount()>0){

			while(cursor.moveToNext()){//游标下标移动

				String  name =cursor.getString(cursor.getColumnIndex(Phone.DISPLAY_NAME));

				String phone =cursor.getString(cursor.getColumnIndex(Phone.DATA));

				Log.i("xxxxxx", "name:"+name+","+"phone"+phone);

				HashMap<String, String> map = new HashMap<String, String>();

				map.put("name", name);

				map.put("phone", phone);

				list.add(map);

			}

			ListView listView1 =(ListView) findViewById(R.id.listView1);

			SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, list,  R.layout.listview_item,

					new String[]{"name","phone"}, new int[]{R.id.textView1,R.id.textView2});

			listView1.setAdapter(adapter);

		}

		insert();//添加系统ContentProvider 内容

	}

	private  void insert() {

			//获得ContentResolver对象实例

	   ContentResolver  cr=getContentResolver();

		//将添加的信息封装到ContentValues对象

		 ContentValues  values = new ContentValues();

		 //定义Uri

		 Uri uri = Contacts.People.CONTENT_URI;

		 //添加姓名

		 values.put(People.NAME, "Android");

		 //添加电话号

		 values.put(People.NUMBER, "12345");

		 //执行添加操作

		 cr.insert(uri, values);

		 Toast.makeText(getApplicationContext(), "添加成功" , Toast.LENGTH_SHORT).show();

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

}

R.Layout.XML文件 listview_item.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

        <TextView

            android:id="@+id/textView1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="TextView" />

        <TextView

            android:id="@+id/textView2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="TextView" />

    </LinearLayout>

</LinearLayout>

activity_main.xml

<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=".MainActivity" >

    <ListView

        android:id="@+id/listView1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/textView1"

        android:layout_below="@+id/textView1" >

    </ListView>

</RelativeLayout>