[android] 09_手动生成xml文件——模拟短信备份

xml生成格式：

一、手动编码代码生成xml文件

/**

* 1、手动备份短信信息到一个xml文件中去

* @param view

*/

public void click1(View view) {

try {

// 1、用一个FileOutputStream关联文件输出

String externalStorageState = Environment.getExternalStorageState();

Log.i(TAG, "sdcard状态：" + externalStorageState);

File file = new File(Environment.getExternalStorageDirectory(),"smsinfo.xml");

FileOutputStream fos = new FileOutputStream(file);

// 2、用一个StringBuilder来保存数据

StringBuilder sbBuilder = new StringBuilder();

sbBuilder.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");

sbBuilder.append("<smss>");

for (SmsInfo smsInfo : listsSmsInfos) {

// 3、然后将数据写到一个xml文件中去

sbBuilder.append("<sms>");

sbBuilder.append("<body>");

sbBuilder.append("</body>" + smsInfo.getBody());// 这里有非法字符，写成的xml文件不能正常打开，需要手动对特殊进行转义

sbBuilder.append("</body>");

sbBuilder.append("<address>");

sbBuilder.append(smsInfo.getAddress());

sbBuilder.append("</address>");

sbBuilder.append("<date>");

sbBuilder.append(String.valueOf(smsInfo.getDate()));

sbBuilder.append("</date>");

sbBuilder.append("</sms>");

}

sbBuilder.append("</smss>");

fos.write(sbBuilder.toString().getBytes());

// 4、关闭资源

fos.close();

Toast.makeText(this, "备份短信到xml成功！", 0).show();

} catch (Exception e) {

e.printStackTrace();

Toast.makeText(this, "备份短信到xml失败！", 0).show();

return;

}

二、使用xSerializer生成xml文件

/**

* 2、使用xSerializer生成xml文件

* 可以解决特殊字符的问题，会进行自动转义的操作

* @param view

*/

public void click(View view) {

Log.i(TAG, "开始备份了。。。");

try {

// 1,初始化一个xml文件的序列化器

XmlSerializer xSerializer = Xml.newSerializer();

// 2.初始化序列器参数

File file = new File(Environment.getExternalStorageDirectory(),"smsinfo.xml");

FileOutputStream fos = new FileOutputStream(file);

xSerializer.setOutput(fos, "utf-8");

// 3.开始写xml文件.

xSerializer.startDocument("utf-8", true);

xSerializer.startTag(null, "smss");

for (SmsInfo smsInfo : listsSmsInfos) {

xSerializer.startTag(null, "sms");

xSerializer.startTag(null, "body");

xSerializer.text("</body>" + smsInfo.getBody());

xSerializer.endTag(null, "body");

xSerializer.startTag(null, "address");

xSerializer.text(smsInfo.getAddress());

xSerializer.endTag(null, "address");

xSerializer.startTag(null, "date");

xSerializer.text(String.valueOf(smsInfo.getDate()));

xSerializer.endTag(null, "date");

xSerializer.endTag(null, "sms");

}

xSerializer.endTag(null, "smss");

xSerializer.endDocument();