popupwindow弹出

旧版listview点击条目弹出popupwindow，同样适用于recycleview。

//        syw 长按事件处理
        lvEventList.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
                showDeletePopWindow(view);
                return true;//为true时，消耗掉点击事件，onItemClick不再调用
            }
        });

    private void showDeletePopWindow(View view) {
        View convertview = View.inflate(getActivity(),R.layout.item_delete , null);
        TextView tv_delete=convertview.findViewById(R.id.tv_delete);
        PopupWindow subjectWindow = new PopupWindow(convertview, -2, -2, true);
        subjectWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

        subjectWindow.showAsDropDown(view,view.getWidth()-subjectWindow.getWidth(),-view.getHeight(),Gravity.CENTER);
        backgroundAlpha(0.5f);
        subjectWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                backgroundAlpha(1.0f);
            }
        });
        subjectWindow.update();
    }

<?xml version="1.0" encoding="utf-8"?>
<com.beijingyiling.maopai.ui.MyAutoLinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:background="@color/white"
        android:id="@+id/tv_delete"
        android:layout_width="wrap_content"
        android:text="点击删除"
        android:paddingRight="20px"
        android:paddingLeft="20px"
        android:textSize="26px"
        android:gravity="center"
        android:minHeight="120px"
        android:layout_height="wrap_content" />

</com.beijingyiling.maopai.ui.MyAutoLinearLayout>