检查android的sdcard上是否存在目录

How do I check if a directory exist on the sdcard in android?

如何检查sdcard中是否存在一个目录?

6 个解决方案

#1

106

Regular Java file IO:

普通Java文件IO:

File f = new File(Environment.getExternalStorageDirectory() + "/somedir");
if(f.isDirectory()) {
   ....

Might also want to check f.exists(), because if it exists, and isDirectory() returns false, you'll have a problem. There's also isReadable()...

可能还想检查f.exists()，因为如果它存在，isDirectory()返回false，就会出现问题。还有isReadable()……

Check here for more methods you might find useful.

在这里查看更多您可能会发现有用的方法。

#2

File dir = new File(Environment.getExternalStorageDirectory() + "/mydirectory");
if(dir.exists() && dir.isDirectory()) {
    // do something here
}

#3

The following code also works for java files:

以下代码也适用于java文件:

// Create file upload directory if it doesn't exist    
if (!sdcarddir.exists())
   sdcarddir.mkdir();

#4

General use this function for checking is a Dir exists:

一般使用此功能检查的是一个Dir:

public boolean dir_exists(String dir_path)
  {
    boolean ret = false;
    File dir = new File(dir_path);
    if(dir.exists() && dir.isDirectory())
      ret = true;
    return ret;
  }

Use the Function like:

使用功能:

String dir_path = Environment.getExternalStorageDirectory() + "//mydirectory//";

if (!dir_exists(dir_path)){
  File directory = new File(dir_path); 
  directory.mkdirs(); 
}

if (dir_exists(dir_path)){
  // 'Dir exists'
}else{
// Display Errormessage 'Dir could not creat!!'
}

#5

I've made my mistake about checking file/ directory. Indeed, you just need to call isFile() or isDirectory(). Here is the docs

我在检查文件/目录时犯了一个错误。实际上，您只需要调用isFile()或isDirectory()。这是文档

You don't need to call exists() if you ever call isFile() or isDirectory().

如果调用isFile()或isDirectory()，则不需要调用exist()。

#6

Yup tried a lot, beneath code helps me :)

Yup尝试了很多，下面的代码帮助了我:)

 File folder = new File(Environment.getExternalStorageDirectory() + File.separator + "ur directory name");

                if (!folder.exists()) {
                    Log.e("Not Found Dir", "Not Found Dir  ");
                } else {
                    Log.e("Found Dir", "Found Dir  " );
                   Toast.makeText(getApplicationContext(),"Directory is already exist" ,Toast.LENGTH_SHORT).show();
                }

#1

106