android用PopWindow做下拉框实例代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="110dp"
 android:layout_height="wrap_content">
 <LinearLayout
  android:layout_width="100dp"
  android:layout_height="wrap_content"
  android:background="@drawable/bg_circle_drop_down_qr_code"
  android:orientation="vertical"
  android:layout_marginRight="@dimen/padding_10"
  android:paddingBottom="0dp"
  android:paddingLeft="@dimen/padding_5"
  android:paddingRight="@dimen/padding_5"
  android:paddingTop="@dimen/padding_5">

  <LinearLayout
   android:id="@+id/lin_scan_qr_code"
   android:layout_width="match_parent"
   android:layout_height="0dp"
   android:layout_weight="1"
   android:gravity="center"
   android:orientation="horizontal"
   android:paddingBottom="@dimen/padding_5"
   android:paddingTop="@dimen/padding_5">

   <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_circle_scan_qr_code" />

   <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="@dimen/padding_10"
    android:gravity="center"
    android:text="扫一扫"
    android:textColor="@color/color_white"
    android:textSize="@dimen/text_16" />
  </LinearLayout>

  <View
   android:layout_width="wrap_content"
   android:layout_height="1px"
   android:layout_marginLeft="@dimen/padding_3"
   android:layout_marginRight="@dimen/padding_3"
   android:background="@color/color_white" />

  <LinearLayout
   android:id="@+id/lin_my_qr_code"
   android:layout_width="match_parent"
   android:layout_height="0dp"
   android:layout_weight="1"
   android:gravity="center"
   android:orientation="horizontal"
   android:paddingBottom="@dimen/padding_5"
   android:paddingTop="@dimen/padding_5">

   <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_circle_my_qr_code" />

   <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="@dimen/padding_10"
    android:gravity="center"
    android:text="二维码"
    android:textColor="@color/color_white"
    android:textSize="@dimen/text_16" />
  </LinearLayout>
 </LinearLayout>
</LinearLayout>

// // 获取自定义布局文件pop.xml的视图
  View customView = getActivity().getLayoutInflater().inflate(R.layout.lay_circle_pop_drop_down_qr_code,
    null, false);
  // 创建PopupWindow实例,200,150分别是宽度和高度

  mQrCodePopWindow = new PopupWindow(customView, CommonUtil.dipToPx(getContext(),110), ViewGroup.LayoutParams.WRAP_CONTENT,true);
  // 设置动画效果 [R.style.AnimationFade 是自己事先定义好的]
//  popupwindow.setAnimationStyle(R.style.AnimationFade);
//  popupwindow.setTouchable(true);
//  popupwindow.setOutsideTouchable(true);
  mQrCodePopWindow.setBackgroundDrawable(new BitmapDrawable());
  customView.findViewById(R.id.lin_scan_qr_code).setOnClickListener(v -> {
   ToastUtil.show(getContext(),"扫一扫");
   dismissQrCodePopWindow();
  });
  customView.findViewById(R.id.lin_my_qr_code).setOnClickListener(v -> ToastUtil.show(getContext(),"二维码"));

@OnClick(R.id.lin_top_right)
 public void onClick(View v) {
  if (mQrCodePopWindow != null&& mQrCodePopWindow.isShowing()) {
   mQrCodePopWindow.dismiss();
  } else {
   initQrCodePopWindow();
   mQrCodePopWindow.showAsDropDown(v);
  }
 }