Android 调用系统通讯录

这个过程有三步：
1)许可向你的应用程序的manifest中添加读取通讯录数据的许可
  <uses-permission android:name="android.permission.READ_CONTACTS" />  
  <uses-permission android:name="android.permission.WRITE_CONTACTS" />

2)调用Contact Picker
在你的activity中，创建一个Intent，用来请求系统查找一个能够执行一个从Contacts URI的项目中发出的PICK动作的activity，
Intent intent = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
调用startActivityForResult在Intent中传递（和一个整数的请求代码，在这个例子中是PICK CONTACT ）。这将导致android启动一个已经被等级的activity，用来支持在People.CONTENT URI上的ACTION_PICK ，然后当按下选择（或者取消）的时候返回到这个activity。startActivityForResult(intent, PICK_CONTACT);

3)仍然在你的activity中，重写onActivityResul方法来监听在你的第二个步骤中启动的activi'select a contact' activity的回调。你应该检查反馈的请求代码是否匹配你的期望值，结果代码是否是 RESULT_OK。
通过在数据Intent参数中调用getData()你可以获得选择的联系人的URI。为了获得选择的联系人的名字你需要使用URI从返回的游标中创建一个新的查询和提取的参数。
@Overridepublic void onActivityResult(int reqCode, int resultCode, Intent data) {
super.onActivityResult(reqCode, resultCode, data);
switch (reqCode) {
case (PICK_CONTACT) :
if (resultCode == Activity.RESULT_OK) {
Uri contactData = data.getData();
Cursor c = managedQuery(contactData, null, null, null, null);
if (c.moveToFirst()) {
String name = c.getString(c.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));}}break;}}

然后是例子奉上：

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends Activity {

    EditText text;
    String username,usernumber;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = (EditText)findViewById(R.id.number);
    }

   public void click(View v){
       startActivityForResult(new Intent(
                Intent.ACTION_PICK,ContactsContract.Contacts.CONTENT_URI), 0);
   }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            ContentResolver reContentResolverol = getContentResolver();
             Uri contactData = data.getData();
             @SuppressWarnings("deprecation")
            Cursor cursor = managedQuery(contactData, null, null, null, null);
             cursor.moveToFirst();
             username = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
            String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
            Cursor phone = reContentResolverol.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                     null,
                     ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId,
                     null,
                     null);
             while (phone.moveToNext()) {
                 usernumber = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                 text.setText(usernumber+" ("+username+")");
             }

         }
    }
}

简洁的？

private static final int REQUEST_CONTACT = 1;

private void startContact() {

Intent intent = new Intent();

intent.setAction(Intent.ACTION_PICK);

intent.setData(ContactsContract.Contacts.CONTENT_URI);

startActivityForResult(intent, REQUEST_CONTACT);

}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == REQUEST_CONTACT) {

            if (resultCode == RESULT_OK) {

                if (data == null) {

                    return;

                }    

                Uri result = data.getData();

                contactId = result.getLastPathSegment();

                contactName = getPhoneContacts(contactId);

            }

}