android如何获取手机联系人的数据库示例代码

package com.example.song.lx_day14_contacts;  import android.content.ContentResolver; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView;  import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;  /**  * 获取手机通讯录信息 展示并且修改  * listview  * simpleadapter  * list<Map<String,String>>  */ public class MainActivity extends AppCompatActivity {   private String uri_raw = "content://com.android.contacts/raw_contacts";   //直接获取data表中的 数据类型是phone   private String uri_phone = "content://com.android.contacts/data/phones";   //直接获取data表中数据类型是emali   private String uri_emalis = "content://com.android.contacts/data/emails";   private String uri_data = "content://com.android.contacts/data";   private ListView listView;   private TextView empty;   private SimpleAdapter adapter;   private List<Map<String, String>> data = new ArrayList<>();   private ContentResolver contentResolver;//用来访问数据    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     listView = ((ListView) findViewById(R.id.lv));     empty = ((TextView) findViewById(R.id.empty));     listView.setEmptyView(empty);//设置空视图     adapter = new SimpleAdapter(this, data, R.layout.item, new String[]{"_id", "display_Name", "data1"}, new int[]{R.id.id, R.id.name, R.id.number});     listView.setAdapter(adapter);     contentResolver = getContentResolver();     reloadListView();   }    private void reloadListView() {     data.clear();     data.addAll(selectData());     adapter.notifyDataSetChanged();    }    //查询工作 用于查询data raw_contact标 返回list数据 在刷新adapter   private List<Map<String, String>> selectData() {     /**      * 1.先查询raw 获取_id查出所有联系人      * 2.循环查询-->根据_id去data表中（_id=raw_contacts_id）查询 data1数据      */     Cursor cursor = contentResolver.query(Uri.parse(uri_raw), new String[]{"_id", "display_name"}, null, null, null);     //cursor返回的cursor数量不定     List<Map<String, String>> list = new ArrayList<>();     while (cursor != null && cursor.moveToNext()) {       String _id = cursor.getString(0);       String displayName = cursor.getString(1);       Map<String, String> map = new HashMap<>();       map.put("_id", _id);       map.put("display_Name", displayName);       //根据_id 去data查手机号       Cursor cursor1 = contentResolver.query(Uri.parse(uri_phone), new String[]{"data1"}, "raw_contact_id=?", new String[]{_id}, null);       //循环拿到手机号       StringBuffer sb = new StringBuffer();       //这里循环拿到手机号是因为有时联系人中 你可能一个人有几个电话       while (cursor1 != null && cursor1.moveToNext()) {         sb.append(cursor1.getString(0) + "/n");       }       cursor1.close();       map.put("data1", sb.toString());       list.add(map);     }     cursor.close();     return list;   } } 

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