读取系统联系人

读取联系人重要的权限： <uses-permission android:name="android.permission.READ_CONTACTS"/>
//如果需要添加联系人，权限是write
//代码
package com.example.readcontacts;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView tv_show = (TextView) findViewById(R.id.tv_show);
          ContentResolver cr = getContentResolver();
            Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");// id主表
            Cursor primarytable = cr.query(uri, null, null, null, null);
            while (primarytable.moveToNext()) {
                String contact_id = primarytable.getString(primarytable .getColumnIndex("contact_id"));
                if (contact_id != null) {//判断联系人主表该字段是否为null，因为手机删除的联系人并不是从数据库删除而是主表设置为了null
                    // 查到了表中人的id后再查人的详细信息
                    Uri uridata = Uri.parse("content://com.android.contacts/data");
                    Cursor dataquery = cr.query(uridata, new String[]{"data1","mimetype"}, "raw_contact_id=?",new String[]{contact_id}, null);
                    while (dataquery.moveToNext()) {
                        String data1 = dataquery.getString(dataquery.getColumnIndex("data1"));
                        String mimetype = dataquery.getString(dataquery .getColumnIndex("mimetype"));
                        String name = null;
                        if ("vnd.android.cursor.item/email_v2".equals(mimetype)) {
                            name = "邮箱：";
                        } else if ("vnd.android.cursor.item/nickname".equals(mimetype)) {
                            name = "昵称：";
                        } else if ("vnd.android.cursor.item/phone_v2".equals(mimetype)) {
                            name = "电话：";
                        } else if ("vnd.android.cursor.item/name".equals(mimetype)) {
                            name = "姓名：";
                        } else if ("vnd.android.cursor.item/postal-address_v2".equals(mimetype)) {
                            name = "地址：";
                        }
                        System.out.println(name + data1);
                        tv_show.append(name+":"+data1+"\n");
                    }

                    dataquery.close();//读取完了每一个联系所有信息关闭一次联系内容表资源
                }
            }

            primarytable.close();//关闭主表资源
    }
}