安卓保存联系人到系统通讯录

[走在安卓路上的菜鸟]

package com.example.writeContect;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import android.os.Build;

/**
* 需求：向系统通讯录添加一个联系人
* 步骤：
* 1.向raw_contacts表添加一个id
* 2.通过查询raw_contacts表获取_id的值，然后_id+1插入到raw_contacts表
* 3.向data表添加data1的内容和mimetype类型
*
*/
public class MainActivity extends Activity {


protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);


}

public void click(View view){
ContentResolver resolver=getContentResolver();
Uri uri=Uri.parse("content://com.android.contacts/raw_contacts");
Uri dataUri=Uri.parse("content://com.android.contacts/data");

Cursor cursor=resolver.query(uri, new String[]{"_id"}, null, null, null);

cursor.moveToLast();


int _id=cursor.getInt(0);
ContentValues values=new ContentValues();
values.put("contact_id", _id+1);
resolver.insert(uri, values);

Toast.makeText(this, "保存成功", 0).show();


Cursor cursor2=resolver.query(dataUri,null, null, null, null);
ContentValues telValues=new ContentValues();
telValues.put("data1", "110");
telValues.put("mimetype","vnd.android.cursor.item/phone_v2");
resolver.insert(dataUri, telValues);


ContentValues telValues2=new ContentValues();

telValues2.put("data1", "119");
telValues2.put("mimetype","vnd.android.cursor.item/phone_v2");
resolver.insert(dataUri, telValues2);

ContentValues nameValues=new ContentValues();
nameValues.put("data1", "wangwu");
nameValues.put("mimetype","vnd.android.cursor.item/name");
resolver.insert(dataUri, nameValues);

}

}

[Jeese126]

空指针异常，有错误提示 在哪出错。