java - 如何通过按入软键来在软键盘中打开上下文菜单？

例如，当我在虚拟键盘上的“完成”软键上选择时，它将触发上下文菜单以显示带有“选项”标题的选项，例如“选项1”，“选项2”，“选项3”。

以下是我的xml文件的简化版本。

<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
android:keyWidth="10%p"
android:horizontalGap="0px"
android:verticalGap="0px"
android:keyHeight="@dimen/key_height"
>

<Row>
    <Key android:codes="1" android:keyLabel="Encrypt" android:keyEdgeFlags="left"/>
    <Key android:codes="2" android:keyLabel="Translate"/>
    <Key android:codes="3" android:keyLabel="Done" android:keyEdgeFlags="right"/>
</Row>
</Keyboard>

最佳答案

要显示上下文菜单，请参见以下代码：

在Activity的onCreate方法中：

  key.setOnClickListener(new OnClickListener() {

       @Override
       public void onClick(View v) {
        //Creating the instance of PopupMenu
        PopupMenu popup = new PopupMenu(MainActivity.this, button1);
        //Inflating the Popup using xml file
        popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());

        //registering popup with OnMenuItemClickListener
        popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
         public boolean onMenuItemClick(MenuItem item) {
          Toast.makeText(MainActivity.this,"You Clicked : " + item.getTitle(),Toast.LENGTH_SHORT).show();
          return true;
         }
        });

        popup.show();//showing popup menu
       }
      });//closing the setOnClickListener method

档案：poupup_menu.xml

<menu xmlns:androclass="http://schemas.android.com/apk/res/android" >

<item
    android:id="@+id/one"
    android:title="One"/>

<item
    android:id="@+id/two"
    android:title="Two"/>

<item
    android:id="@+id/three"
    android:title="Three"/>

</menu>