How to display files on the SD card in a ListView?

Question

I would like to create a button that when clicked will go to a class that displays all media files from an SD card using a ListView.

After selecting from the list it will then return the filename selected to the main class. IF the returned file is an image file, it will be displayed in an ImageView and if the returned file is an audio file, it'll just display an icon.

Answer 1

Add a Method GetFiles() to your program. Call it to get an ArrayList<> of all the files. You can then use it to populate your listview. You need to provide String argument DirectoryPath.

The Function:

public ArrayList<String> GetFiles(String DirectoryPath) {
    ArrayList<String> MyFiles = new ArrayList<String>();
    File f = new File(DirectoryPath);

    f.mkdirs();
    File[] files = f.listFiles();
    if (files.length == 0)
        return null;
    else {
        for (int i=0; i<files.length; i++) 
            MyFiles.add(files[i].getName());
    }

    return MyFiles;
}

Usage Example:

@Override
public void onCreate() {
// Other Code

    ListView lv;
    ArrayList<String> FilesInFolder = GetFiles("/sdcard/somefolder");
    lv = (ListView)findViewById(R.id.filelist);

    lv.setAdapter(new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_1, FilesInFolder));

    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            // Clicking on items
         }
    });
}

Make sure that the External Storage is Readable: http://developer.android.com/guide/topics/data/data-storage.html#filesExternal

To Filter files based on Name/Extension: How to acces sdcard and return and array with files off a specific format?

Answer 2

First i strongly suggest you read some tutorials about android first so you get the basics. You have to implement the following to do this

1. List all media files - How to list all media in Android?
2. Start new Activity
3. Android: Capturing the return of an activity