Android如何给Textview添加菜单项详解(Java)

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/to_detail"
        android:title="细节增强"/>
    <item android:id="@+id/to_fudiao"
        android:title="浮雕效果"/>
    <item android:id="@+id/to_mosic"
        android:title="马赛克效果"/>
    <item android:id="@+id/to_frost"
        android:title="点状图"/>
    <item android:id="@+id/to_spread"
        android:title="毛玻璃"/>
</menu>

  private PopupMenu popupMenu;//定义菜单按钮

    //重写菜单监听事件
    public void menuClick(View view){
        popupMenu = new PopupMenu(this,view);
        getMenuInflater().inflate(R.menu.main,popupMenu.getMenu());
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                switch (item.getItemId()){
                    case R.id.to_detail:
                        flag.setText("细节增强");
                        break;
                    case R.id.to_fudiao:
                        flag.setText("浮雕效果");
                        break;
                    case R.id.to_mosic:
                        flag.setText("马赛克");
                        break;
                    case R.id.to_frost:
                        flag.setText("点状图");
                        break;
                    case R.id.to_spread:
                        flag.setText("毛玻璃");
                        break;
                }
                return true;
            }
        });
        popupMenu.show();
    }