android内容提供者contentProvider_短信备份

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一、项目目录结构

二、activity_main.xml界面

三、activity_main.xml代码

<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>

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 {@Overrideprotected 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uriUri 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

<?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>

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