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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;
	}
	@Override
	public 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 block
			Toast.makeText(this, "备份失败", 3000).show();
			e.printStackTrace();
		}
    	
    }
}

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