Android新建文件夹

private void openDir() {
    File file = new File(file_Path);
    if(!file.exists()){
        if(file.mkdirs())   //makir()最多只能新建一层，makdirs()可以新建多层
            Toast.makeText(getApplicationContext(),"新建成功",Toast.LENGTH_SHORT).show();
        else Toast.makeText(getApplicationContext(),"新建失败",Toast.LENGTH_SHORT).show();
    }
    else Log.d(TAG,"文件夹已存在");
}