android内容提供者contentProvider_短信备份

一、项目目录结构

二、activity_main.xml界面

三、activity_main.xml代码

四、MainActivity.java代码

package com.zgs.smsBackup;

import java.io.File;
import java.io.FileOutputStream;

import org.xmlpull.v1.XmlSerializer;

import android.app.Activity;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Xml;
import android.view.View;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	//点击按钮查询短信内容 然后把短信内容进行备份
	public void click(View v) {
		try {
			//[1]获取XmlSerializer的实例
			XmlSerializer serializer = Xml.newSerializer();
			//[2]设置序列化器参数 
			File file = new File(Environment.getExternalStorageDirectory().getPath(),"smsbackup.xml");
			System.out.println(Environment.getExternalStorageDirectory().getPath());
			FileOutputStream fos = new FileOutputStream(file);
			serializer.setOutput(fos, "utf-8");
			//[3]写xml文档开头 
			serializer.startDocument("utf-8", true);

			//[4]写xml的根节点
			serializer.startTag(null, "smss");
			//[5]构造uri
			Uri uri = Uri.parse("content://sms/");

			//[6]由于短信的数据库已经通过内容提供者暴露出来 所以我们直接通过内容解析者查询 
			Cursor cursor = getContentResolver().query(uri, new String[]{"address","date","body"}, null, null, null);
			while(cursor.moveToNext()){
				String address = cursor.getString(0);
				String date = cursor.getString(1);
				String body = cursor.getString(2);

				//[7]写sms节点 
				serializer.startTag(null, "sms");
				//[8]写address节点 
				serializer.startTag(null, "address");
				serializer.text(address);
				serializer.endTag(null, "address");

				//[9]写date节点 
				serializer.startTag(null, "date");
				serializer.text(date);
				serializer.endTag(null, "date");
				//[10]写body节点 
				serializer.startTag(null, "body");
				serializer.text(body);
				serializer.endTag(null, "body");

				serializer.endTag(null, "sms");

			}

			serializer.endTag(null, "smss");
			serializer.endDocument();
			fos.close();
			System.out.println("写XML成功！！！");

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

五、AndroidManifest.xml代码