1，数据的保存

File file=new File(Environment.getExternalStorageDirectory(), name);

try {

FileOutputStream fos=new FileOutputStream(file);

fos.write(content.getBytes());

fos.close();

Toast.makeText(getApplicationContext(),"保存成功", 200).show();

}catch (Exception e) {

Toast.makeText(getApplicationContext(),"保存失败", 200).show();

e.printStackTrace();

}

2，数据的读取

File file = new File(Environment.getExternalStorageDirectory(), name);

try {

FileInputStream fis= new FileInputStream(file);

BufferedReader br =new BufferedReader(new InputStreamReader(fis));

//读取文档的数据

String content =br.readLine();

//拆分字符串

String [] str =content.split("=");

//显示数据

if(!content.isEmpty()){

et_name.setText(str[0]);

et_password.setText(str[1]);

}

} catch (Exception e) {

e.printStackTrace();

}

}

});

注意：保存数据记得注册

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

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>