SimpleCursorAdapter-获取电话簿中联系人并显示在类表中

package com.eson.simplecursoradapter ;

import android.database.Cursor ;
import android.os.Bundle ;
import android.provider.Contacts ;
import android.support.v7.app.AppCompatActivity ;
import android.widget.ListAdapter ;
import android.widget.ListView ;
import android.widget.SimpleCursorAdapter ;

public class MainActivity extends AppCompatActivity {

private ListView listView;

@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState) ;

listView = new ListView( this );

Cursor cursor = getContentResolver().query(Contacts.People. CONTENT_URI , null, null, null, null );
startManagingCursor(cursor) ;
ListAdapter listAdapter = new SimpleCursorAdapter(this, android.R.layout. simple_expandable_list_item_1 ,
cursor, new String[]{Contacts.People. NAME }, new int []{android.R.id. text1}) ;
listView .setAdapter(listAdapter) ;
setContentView( listView );

}
}

<uses-permission android :name="android.permission.READ_CONTACTS" />