Android目录创建在内部存储上失败

Question

I want to create a new folder/directory called lists but it just keeps on failing, if anyone had any suggestions that would be greatly appreciated. Thank you.

File file = new File(this.getFilesDir() +File.separator +"Lists");

if(file.mkdirs()){
    System.out.println("Directory success");
}else{
    System.out.println("Directory failed!");
}

System.out.println(file.getAbsolutePath());
if(file.isDirectory()){
    System.out.println("File is a directory");
    File lists[] = file.listFiles();
    String names[] = new String[lists.length];
    if(lists.length >0){
        for(int i = 0; i < lists.length; i ++){
            names[i] = lists[i].getName();
        }
    }else{
        names[0] = "Create New List";
    }
}else{
    System.out.println("File is not a directory");
}

Answer 1

My first answer is completely incorrect (my apologies for that)! I believe this one is correct.

I think problem lies with the following lines:

File lists[] = file.listFiles();
String names[] = new String[lists.length];
if(lists.length > 0){
    for(int i = 0; i < lists.length; i ++){
        names[i] = lists[i].getName();
    }
}else{
    names[0] = "Create New List";
}

You had just created the folder so there will be no files in it so lists[] won't have any size, but in your else statement you are adding an item to the names array even though it doesn't have a size. Removing names[0] = "Create New List"; from the else statement should work.