List of files in assets folder and its subfolders

问题

I have some folders with HTML files in the "assets" folder in my Android project. I need to show these HTML files from assets' sub-folders in a list. I already wrote some code about making this list.

lv1 = (ListView) findViewById(R.id.listView);
// Insert array in ListView

// In the next row I need to insert an array of strings of file names
// so please, tell me, how to get this array

lv1.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, filel));
lv1.setTextFilterEnabled(true);
// onclick items in ListView:
lv1.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> a, View v, int position, long id) {
        //Clicked item position
        String itemname = new Integer(position).toString();  
        Intent intent = new Intent();
        intent.setClass(DrugList.this, Web.class);
        Bundle b = new Bundle();
        //I don't know what it's doing here
        b.putString("defStrID", itemname); 
        intent.putExtras(b);
        //start Intent
        startActivity(intent);
    }
});

回答1:

private boolean listAssetFiles(String path) {

    String [] list;
    try {
        list = getAssets().list(path);
        if (list.length > 0) {
            // This is a folder
            for (String file : list) {
                if (!listAssetFiles(path + "/" + file))
                    return false;
                else {
                    // This is a file
                    // TODO: add file name to an array list
                }
            }
        } 
    } catch (IOException e) {
        return false;
    }

    return true; 
}

Call the listAssetFiles with the root folder name of your asset folder.

    listAssetFiles("root_folder_name_in_assets");

If the root folder is the asset folder then call it with

    listAssetFiles("");

回答2:

try this it will work in your case

f = getAssets().list("");
for(String f1 : f){
    Log.v("names",f1);
}

The above snippet will show the contents of the asset root.

For example... if below is the asset structure..

assets
 |__Dir1
 |__Dir2
 |__File1

Snippet's output will be .... Dir1 Dir2 File1

If you need the contents of the Directory Dir1

Pass the name of Directory in the list function.

  f = getAssets().list("Dir1");

回答3:

Hope This Help:

following code will copy all the folder and it's content and content of sub folder to sdcard location:

 private void getAssetAppFolder(String dir) throws Exception{

    {
        File f = new File(sdcardLocation + "/" + dir);
        if (!f.exists() || !f.isDirectory())
            f.mkdirs();
    }
     AssetManager am=getAssets();

     String [] aplist=am.list(dir);

     for(String strf:aplist){
        try{
             InputStream is=am.open(dir+"/"+strf);
             copyToDisk(dir,strf,is);
         }catch(Exception ex){


            getAssetAppFolder(dir+"/"+strf);
         }
     }



 }


 public void copyToDisk(String dir,String name,InputStream is) throws IOException{
     int size;
        byte[] buffer = new byte[2048];

        FileOutputStream fout = new FileOutputStream(sdcardLocation +"/"+dir+"/" +name);
        BufferedOutputStream bufferOut = new BufferedOutputStream(fout, buffer.length);

        while ((size = is.read(buffer, 0, buffer.length)) != -1) {
            bufferOut.write(buffer, 0, size);
        }
        bufferOut.flush();
        bufferOut.close();
        is.close();
        fout.close();
 }

回答4:

Here is a solution to my problem that I found out working 100% listing all directories and files even sub-directories and files in subdirectories.

Note: In my case

Filenames had a . in them. i.e. .htm .txt etc

Directorynames did not have any . in them.

listAssetFiles2(path); // <<-- Call function where required


//function to list files and directories
public void listAssetFiles2 (String path){
String [] list;

try {
    list = getAssets().list(path);
    if(list.length > 0){
        for(String file : list){
            System.out.println("File path = "+file);

            if(file.indexOf(".") < 0) { // <<-- check if filename has a . then it is a file - hopefully directory names dont have . 
                System.out.println("This is a folder = "+path+"/"+file);
                listAssetFiles2(file); // <<-- To get subdirectory files and directories list and check 
            }else{
                System.out.println("This is a file = "+path+"/"+file);
            }
        }

    }else{
        System.out.println("Failed Path = "+path);
        System.out.println("Check path again.");
    }
}catch(IOException e){
    e.printStackTrace();
}
}//now completed

Thanks

回答5:

Based on the @Kammaar answer. This kotlin code scans the file tree for the leafs:

private fun listAssetFiles(path: String, context: Context): List<String> {
    val result = ArrayList<String>()
    context.assets.list(path).forEach { file ->
        val innerFiles = listAssetFiles("$path/$file", context)
        if (!innerFiles.isEmpty()) {
            result.addAll(innerFiles)
        } else {
            // it can be an empty folder or file you don't like, you can check it here
            result.add("$path/$file")
        }
    }
    return result
}

回答6:

i think that this is best that check file is dir or not, altarnative try,catch!

 public static  List<String> listAssetFiles(Context c,String rootPath) {
    List<String> files =new ArrayList<>();
    try {
        String [] Paths = c.getAssets().list(rootPath);
        if (Paths.length > 0) {
            // This is a folder
            for (String file : Paths) {
                String path = rootPath + "/" + file;
                if (new File(path).isDirectory())
                    files.addAll(listAssetFiles(c,path));
                else files.add(path);
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
   return files;
}

来源：https://stackoverflow.com/questions/16234529/list-of-files-in-assets-folder-and-its-subfolders

标签

android

assets