android - 如何在上下文菜单中创建弹出菜单？

Question

我想为上下文菜单创建一个弹出菜单，这样当我长按上下文菜单时，它会显示另一个弹出菜单。

这是我为上下文菜单编写的代码

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val button = findViewById<Button>(R.id.btn)
    registerForContextMenu(button)
}

override fun onCreateContextMenu(menu: ContextMenu?, v: View?, menuInfo: ContextMenu.ContextMenuInfo?) {
    super.onCreateContextMenu(menu, v, menuInfo)
    menu?.setHeaderTitle("Choose one")
    menu?.add(0, v?.getId()!!, 0, "Upload")
    menu?.add(0, v?.getId()!!, 0, "Search")
    menu?.add(0, v?.getId()!!, 0, "Share")
}

override fun onContextItemSelected(item: MenuItem): Boolean {

    return super.onContextItemSelected(item)
}

Answer 1

在 Java 中，当我长按按钮时它显示上下文菜单，然后我选择上下文菜单它显示弹出菜单。

Button button = findViewById(R.id.button);
registerForContextMenu(button);

 @Override
 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.setHeaderTitle("Context Menu");
        menu.add(0, v.getId(), 0, "Upload");
        menu.add(0, v.getId(), 0, "Search");
        menu.add(0, v.getId(), 0, "Share");
        menu.add(0, v.getId(), 0, "Bookmark");
    }

@Override
public boolean onContextItemSelected(MenuItem item) {
        super.onContextItemSelected(item);
        try {
            showPopup(findViewById(item.getItemId()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }

private void showPopup(View anchorView) {
        PopupMenu popup = new PopupMenu(this, anchorView);
        popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                Toast.makeText(MapsActivity.this, "Selected Item: "
                        + item.getTitle(), Toast.LENGTH_SHORT).show();
                return true;
            }
        });
        popup.inflate(R.menu.menu_example);
        popup.show();
    }