android (java) 中关于文件、文件夹的一些操作

1.判断文件、文件夹是否已存在

public static boolean fileIn(String thePath){
    File file = new File(thePath);
    return file.exists();
}

2.创建一个文件夹

public static int mkDir(String path){
    File dirFile = new File(path);
    if(!dirFile.exists()){
        if(!dirFile.mkdirs()){
            Log.d("tag","mkdir fail "+path);
            return -1;
        }
    }else {
        Log.d("tag","Dir exist "+path);
    }
    
    return 0;
}

3.删除一个文件夹内的所有子文件子文件夹

public static boolean delAllFile(String path) {
    boolean flag = false;
    File file = new File(path);
    if (!file.exists()) {
        return flag;
    }
    if (!file.isDirectory()) {
        return flag;
    }
    String[] tempList = file.list();
    File temp = null;
    for (int i = 0; i < tempList.length; i++) {
        if (path.endsWith(File.separator)) {
            temp = new File(path + tempList[i]);
        } else {
            temp = new File(path + File.separator + tempList[i]);
        }
        if (temp.isFile()) {
            temp.delete();
        }
        if (temp.isDirectory()) {
            delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件

            /* 再删除空文件夹 */
            lastFolder(path + "/" + tempList[i]);

            flag = true;
        }
    }
    return flag;
}

public static void lastFolder(String folderPath) {
    try {
        String filePath = folderPath;
        java.io.File myFile = new java.io.File(filePath);
        if (myFile.exists()) {
            myFile.delete(); //删除空文件夹
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}

本文地址：https://blog.csdn.net/duanke111/article/details/107413385