可以写一个工具类把这些代码复制进去
先获取一个唯一的uid
/**
* 获取UUID
*
* @return uid
*/
public static String getUID() {
return UUID.randomUUID().toString().replaceAll("-", "");
}
public static StringrootXMLPath = Environment.getExternalStorageDirectory().getPath() +"/UUID";
/**
* 保存内容到TXT文件中
*/
public static boolean writeToXML() {
boolean isExists;
FileOutputStream fileOutputStream;
BufferedWriter bufferedWriter;
createDirectory(rootXMLPath);
File file =new File(rootXMLPath +"/" +"uuid" +".txt");
try {
//文件是否创建成功
isExists = file.createNewFile();
if(isExists){
fileOutputStream =new FileOutputStream(file);
bufferedWriter =new BufferedWriter(new OutputStreamWriter(fileOutputStream));
bufferedWriter.write(getUID());
bufferedWriter.close();
}
}catch (IOException e) {
e.printStackTrace();
return false;
}
return isExists;
}
/**
* 读取TXT内容
* @return
*/
public static StringreadFromXML() {
FileInputStream fileInputStream;
BufferedReader bufferedReader;
StringBuilder stringBuilder =new StringBuilder();
File file =new File(rootXMLPath +"/" +"uuid" +".txt");
if (file.exists()) {
try {
fileInputStream =new FileInputStream(file);
bufferedReader =new BufferedReader(new InputStreamReader(fileInputStream));
String line;
while ((line = bufferedReader.readLine()) !=null) {
stringBuilder.append(line);
}
bufferedReader.close();
}catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}catch (IOException e) {
e.printStackTrace();
return null;
}
}
return stringBuilder.toString();
}
/**
* 创建文件夹
*
* @param fileDirectory
*/
public static void createDirectory(String fileDirectory) {
File file =new File(fileDirectory);
if (!file.exists()) {
file.mkdirs();
}
}
记得开启读写内存权限
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