添加文本选择菜单

SelectTextMenu.kt

customSelectionActionModeCallback = object : ActionMode.Callback2() {
                override fun onCreateActionMode(actionMode: ActionMode, menu: Menu): Boolean {
                    val menuInflater = actionMode.menuInflater
                    menuInflater.inflate(R.menu.text_select_menu, menu)
                    return true //返回false则不会显示弹窗
                }

                override fun onPrepareActionMode(actionMode: ActionMode, menu: Menu): Boolean {
                    return false
                }

                override fun onActionItemClicked(
                    actionMode: ActionMode,
                    menuItem: MenuItem
                ): Boolean {
                    val textStart = selectionStart
                    val textEnd = selectionEnd
                    //根据item的ID处理点击事件
                    when (menuItem.itemId) {
                        R.id.menu_search_word -> {
                            text.subSequence(textStart, textEnd).toString().showToast()
                            actionMode.finish() //收起操作菜单
                        }
                    }
                    return false //返回true则系统的"复制"、"搜索"之类的item将无效，只有自定义item有响应
                }

                override fun onDestroyActionMode(actionMode: ActionMode) {}
            }