读写SD卡文件
权限
判断是否具备读写条件 如果手机存在SDcard,并且应用具有读写权限,则
Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)
返回true
路径 通过
Environment.getExternalStorageDirectory()
获取SDcard的根目录File通过
file.getCanonicalPath()
获取规范化绝对路径Tips:
1.
getPath()
定义路径,定义时为相对路径则返回相对路径;定义时为绝对路径则为绝对路径2.
getAbsolutePath()
定义路径的绝对路径3.
getCanonicalPath
规范化绝对路径File file1 = new File(".\\test.txt");
file1.getPath();
//.\test.txt
file1.getAbsolutePath();
//E:\workspace\Test\.\test.txt
file1.getCanonicalPath();
//E:\workspace\Test\test.txtFile file2 = new File("/sdcard/tlib/test.txt");
file2.getPath();
///sdcard/tlib/test.txt
file2.getAbsolutePath();
///sdcard/tlib/test.txt
file2.getCanonicalPath();
///sdcard/tlib/test.txt
目录 先判断目录是否存在,不存在则创建
File folder = new File(folderName);
if (!folder.exists()) {
folder.mkdir();
}
文件读 【读写SD卡文件】获取文件输入流
FileInputStream fis = new FileInputStream(BasePath + folderName + fileName);
包装输入流
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
文件写
FileOutputStream fileOutputStream = new FileOutputStream(BasePath + folderPath + fileName);
fileOutputStream.write(sb.toString().getBytes());