未显示 ActionMode 菜单图标

Question

我正在尝试在回收站视图中长按某个项目时设置上下文操作栏。但是没有显示菜单图标。

代码如下。

listAdapter.setOnItemClickListener(object : OnItemClickListener {

            override fun onItemClick(position: Int) {
               ...
            }

            override fun onItemLongClick(position: Int): Boolean {

                if (actionMode != null) {
                    return false
                }

                val activity = activity as AppCompatActivity
                actionMode = activity.startSupportActionMode(actionModeCallback)


                return true
            }

        })

动作模式回调

internal val actionModeCallback = object : ActionMode.Callback {

    override fun onActionItemClicked(mode: ActionMode?, item: MenuItem?): Boolean {
        when (item?.itemId) {
            R.id.item_delete -> {
                actionMode?.finish()
                return true
            }
        }
        return false
    }

    override fun onCreateActionMode(mode: ActionMode?, menu: Menu?): Boolean {
        actionMode?.menuInflater?.inflate(R.menu.menu_context, menu)
        actionMode?.title = "delete"

        return true
    }

    override fun onPrepareActionMode(mode: ActionMode?, menu: Menu?): Boolean {

        return false
    }

    override fun onDestroyActionMode(mode: ActionMode?) {
        actionMode = null
    }
}

menu_context.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/item_delete"
        android:title="@string/menu_option_text_delete"
        android:icon="@drawable/ic_delete_white_24dp"
        app:showAsAction="always"
        />
</menu>

我尝试了什么？

对 Activity 和 ActionMode
尝试更改动作模式背景以查看主题是否存在问题
set SHOW_AS_ACTION_ALWAYS in onPrepareActionMode

没用，连动作模式的标题都没有显示。

我正在使用 androidx，appCompat 版本：1.1.0-rc01

请帮忙！

Answer 1

解决方法是在onPrepare ActionMode中手动更新菜单

@Override
  public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
  menu.findItem(R.id.menu_archive).setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
  menu.findItem(R.id.menu_delete).setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
  menu.findItem(R.id.menu_upload_to_cloud).setShowAsAction
  (MenuItem.SHOW_AS_ACTION_ALWAYS);
   return true;
 }

Answer 2

实际上，正如 issue tracker

中指出的那样，这是我的错误

override fun onCreateActionMode(mode: ActionMode?, menu: Menu?): Boolean {
     /*-->*/mode?.menuInflater?.inflate(R.menu.menu_context, menu)
     return true
}
Note that you should use the passed in mode and not your own ActionMode object to get the correct inflater.

未显示 ActionMode 菜单图标

ActionMode menu icon is not shown

android

androidx

android-actionmode