内容提供者复习——短信备份

 对于上一节的相亲神器，大家应该知道怎么用内容提供者去得到系统的数据 进行开发了。

其实对于大部分的URI 可以百度去得到，但是我建议自己倒弄出源码 自己去研究下。

短信URI   content://sms/ 

短信的数据库第一个是id ，第二个是address （地址）第三个日期 （date）第四个type（类型）第五个是body（内容）

demo的思路主要是 拿到接口以后 直接查询  然后序列化到本地 储存起来 保存在SD卡 ，记住加权限还有读取短信的权限

先看实体类吧  因为查询到结果需要储存起来

package com.example.backSms.entrys;public class Smsinfo {private int id;private int type;private String address;private String body;private long date;public int getId() {return id;}public void setId(int id) {this.id = id;}public int getType() {return type;}public void setType(int type) {this.type = type;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public String getBody() {return body;}public void setBody(String body) {this.body = body;}public long getDate() {return date;}public void setDate(long date) {this.date = date;}public Smsinfo(int id, int type, String address, String body, long date) {super();this.id = id;this.type = type;this.address = address;this.body = body;this.date = date;}@Overridepublic String toString() {return "Smsinfo [id=" + id + ", type=" + type + ", address=" + address+ ", body=" + body + ", date=" + date + "]";}public Smsinfo() {super();}}

然后是主体类

<pre name="code" class="java">package com.example.backSms;import java.io.FileOutputStream;import java.util.ArrayList;import java.util.List;import org.xmlpull.v1.XmlSerializer;import com.example.backSms.entrys.Smsinfo;import android.app.Activity;import android.content.ContentResolver;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.util.Xml;import android.view.View;import android.widget.Toast;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }     /**备份短信     * @param view     */    public void btn(View view){     //查处所有短信    Uri uri = Uri.parse("content://sms/");    ContentResolver resolver = getContentResolver();    Cursor cursor = resolver.query(uri, new String[]{"_id","address","date","type","body"}, null, null, null);    if (cursor!=null&&cursor.getCount()>0) {    Smsinfo smsinfo=null;    List<Smsinfo>list=new ArrayList<Smsinfo>();    while (cursor.moveToNext()) {    smsinfo=new Smsinfo();    smsinfo.setId(cursor.getInt(0));    smsinfo.setAddress(cursor.getString(1));    smsinfo.setDate(cursor.getLong(2));    smsinfo.setType(cursor.getInt(3));    smsinfo.setBody(cursor.getString(4));    list.add(smsinfo);}cursor.close();//2.序列化到本地writeTolocal(list);}     }    private void writeTolocal(List<Smsinfo>smsinfos){    XmlSerializer serializer=Xml.newSerializer();//得到序列化对象    //指定输出位置    try {FileOutputStream fos=new FileOutputStream("/mnt/sdcard/sms.xml");serializer.setOutput(fos,"utf-8");serializer.startDocument("utf-8", true);serializer.startTag(null, "smss");for (Smsinfo smsinfo : smsinfos) {serializer.startTag(null, "sms");serializer.attribute(null, "id", String.valueOf(smsinfo.getId()));serializer.startTag(null, "address");serializer.text(smsinfo.getAddress());serializer.endTag(null, "address");serializer.startTag(null, "date");serializer.text(String.valueOf(smsinfo.getDate()));serializer.endTag(null, "date");serializer.startTag(null, "type");serializer.text(String.valueOf(smsinfo.getType()));serializer.endTag(null, "type");serializer.startTag(null, "body");serializer.text(smsinfo.getBody());serializer.endTag(null, "body");serializer.endTag(null, "sms");}serializer.endTag(null, "smss");serializer.endDocument();Toast.makeText(this, "序列化备份成功", 3000).show();} catch (Exception e) {// TODO Auto-generated catch blockToast.makeText(this, "备份失败", 3000).show();e.printStackTrace();}        }}