android内容提供者contentProvider_短信备份

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.zgs.smsBackup.MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<Button
android:onClick="click"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="83dp"
android:text="备份短信" />

</RelativeLayout>

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();
}
}

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.zgs.smsBackup"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="22" />

<uses-permission android:name="android.permission.WRITE_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>