Implementing the MIDlet FileView class

To implement the FileView class:

Create the FileView.java class file.

Import required packages and classes.

import java.io.IOException;

import com.nokia.mid.ui.FileSelect;
import com.nokia.mid.ui.FileSelectDetail;

import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;

Set FileView class to extend Form and implement FileItem.Listener. The FileView class uses FileItem.Listener interface to receive notifications when file item is selected.
```
public class FileView
            extends Form
            implements FileItem.Listener
{
```

Create the required variables and the constructor.

private Listener listener;
private FileItem selectedFileItem;

public FileView(Listener listener) {
    super("Selected files");
    this.listener = listener;

}

Implement the FileItem.Listener interface methods.

public void onPressed(FileItem fileItem) {
    if (selectedFileItem != null) {
        selectedFileItem.setIsSelected(false);
    }

    if (fileItem != null) {
        selectedFileItem = fileItem;
        selectedFileItem.setIsSelected(true);
    }
}


public void onReleased(FileItem fileItem) {
}

public FileSelectDetail getSelectedFileDetails() {
    if (selectedFileItem != null) {
        return selectedFileItem.getFileDetails();
    }

    return null;
}

Create the getSelectedFile method, which runs a new thread for launching the file selector. The selected files are added to this Form.

public void getSelectedFiles(final String startUrl,
                             final int mediaType,
                             final boolean multipleSelection)
{
    final FileView fileView = this;

    deleteAll();
    setTitle("No files selected");

    new Thread(new Runnable() {
        public void run() {
            FileSelectDetail selectedFiles[] = null;

            try {
                selectedFiles =
                    FileSelect.launch(startUrl, mediaType, multipleSelection);
            }
            catch (IllegalArgumentException e) {
                e.printStackTrace();
            }
            catch (IOException e) {
                setTitle("Error");
                String errorMessage =
                    new String("Failed to launch the file selector: " + e.toString());
                StringItem errorMessageItem = new StringItem(null, errorMessage);
                append(errorMessageItem);

                if (listener != null) {
                    listener.onError(errorMessage);
                }
            }

            int numberOfSelectedFiles = 0;

            if (selectedFiles != null) {
                numberOfSelectedFiles = selectedFiles.length;
            }

            if (numberOfSelectedFiles != 0) {
                if (numberOfSelectedFiles > 1) {
                    setTitle(numberOfSelectedFiles + " files selected");

                    if (listener != null) {
                        listener.onMultipleFilesSelected(numberOfSelectedFiles);
                    }
                }
                else {
                    setTitle("One file selected");

                    if (listener != null) {
                        listener.onFileSelected(selectedFiles[0]);
                    }
                }

                for (int i = 0; i < numberOfSelectedFiles; ++i) {
                    append(new FileItem(selectedFiles[i], fileView));
                }
            }
            else {
                System.out.println("FileView::getSelectedFiles(): No files selected.");
            }
        }
    }).start();
}

Create the interface to listen to file selection events.

public interface Listener {
    void onMultipleFilesSelected(int count);
    void onFileSelected(FileSelectDetail fileDetails);
    void onError(String errorMessage);
}