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import java.awt.*;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.util.ArrayList;

import javax.swing.*;

public class DragDropNewActivity extends JFrame implements DropTargetListener {

DropTarget dt;

public DragDropNewActivity()
{       
    setSize(400,300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JLabel lblDraganddrop = new JLabel("Drag And Drop here");
    lblDraganddrop.setHorizontalTextPosition(SwingConstants.CENTER);
    lblDraganddrop.setHorizontalAlignment(SwingConstants.CENTER);
    lblDraganddrop.setFont(new Font("Tahoma",Font.PLAIN,32));
    getContentPane().add(lblDraganddrop, BorderLayout.CENTER);


    dt = new DropTarget (lblDraganddrop, this);
    setVisible(true);

}
    @Override
    public void drop(DropTargetDropEvent dtde)
    {
    try
    {
        Transferable tr = dtde.getTransferable();
        DataFlavor[] flavors = tr.getTransferDataFlavors();
        ArrayList<File> fileNames = new ArrayList<File>();
        for (int i = 0; i < flavors.length; i++)
        {
        if (flavors[i].isFlavorJavaFileListType())
        {
            dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
            @SuppressWarnings("unchecked")
            java.util.List<File> files = (java.util.List<File>) tr.getTransferData(flavors[i]);

            for (int k = 0; k < files.size(); k++)
            {
            fileNames.add(files.get(k));
            // Write the filename/s on console output.
             System.out.println(files.get(k));  

            //Parse through new file
            //new DragDropNewActivityParse().parseThroughFile(files.get(k));

            }

            dtde.dropComplete(true);
        }
        }

    }
    catch (Throwable t)
    {
        t.printStackTrace();
    }
    dtde.rejectDrop();

    }

    @Override
    public void dragEnter(DropTargetDragEvent dtde)
    {}

    @Override
    public void dragOver(DropTargetDragEvent dtde)
    {}

    @Override
    public void dropActionChanged(DropTargetDragEvent dtde)
    {}

    @Override
    public void dragExit(DropTargetEvent dte)
    {}

}

在 Windows 中它可以正常工作。在 Mac OS HighSierra(13.4) 中,它不接受来自 Apple Mail 应用程序的文件。每次尝试从 Apple Mail 应用程序中删除文件时,都会在控制台中写入缺少 HFS 承诺错误。

控制台输出:2018-04-19 10:07:24.237 java[91646:4228080] 无法从粘贴板中获取 HFS Promise 的副本 2018-04-19 10:07:24.238 java[91646:4228080] 寻找粘贴板上的 HFSPromises,但没有找到。

例如,从桌面删除的文件将被接受。有任何想法吗?

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0 回答 0