ContentProvider备份短信，以xml文件存储

因为短信的内容已经通过ContentProvider暴露出来，所以我们可以直接用内容解析者获取短信内容。

想要获取短信内容，你需要知道的一些东西：

1、Uri uri = Uri.parse("content://sms/");

2、Cursor cursor = getContentResolver().query(uri,new String[]{"address","date","body"},null,null,null);

知道了这个就好获取短信的相关信息了

先看代码吧：

 public void onClick(View v) {
         XmlSerializer serializer = Xml.newSerializer();
         File file = new File(Environment.getExternalStorageDirectory().getPath(),"smsbackup.xml");
         try {
             FileOutputStream outputStream =   new FileOutputStream(file);
             serializer.setOutput(outputStream, "utf-8");
             serializer.startDocument("utf-8",true);
             serializer.startTag(null,"smss");

             Uri uri = Uri.parse("content://sms/");
             Cursor cursor = getContentResolver().query(uri,new String[]{"address","date","body"},null,null,null);
             if (cursor!=null){
             while (cursor.moveToNext()){
                 String address = cursor.getString(0);
                 String date = cursor.getString(1);
                 String body = cursor.getString(2);

                 try {
                     //sms节点
                     serializer.startTag(null,"sms");
                     //address节点
                     serializer.startTag(null,"address");
                     serializer.text(address);
                     serializer.endTag(null,"address");
                     //date节点
                     serializer.startTag(null,"date");
                     serializer.text(date);
                     serializer.endTag(null,"date");
                     //body节点
                     serializer.startTag(null,"body");
                     serializer.text(body);
                     serializer.endTag(null,"body");

                     serializer.endTag(null,"sms");

                 } catch (IOException e) {
                     e.printStackTrace();
                 }
                 System.out.println(address+"---"+date+"---"+body);
             }
         }
             serializer.endTag(null,"smss");
             serializer.endDocument();
             outputStream.close();
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

     }

主要用内容解析者获取短信的信息和内容，然后用XmlSerializer存储。

下面是Manifest.xml：需要加上这三个权限

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