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一、常用方法：

1、设置显示的位置

// 一个参数
popupWindow.showAsDropDown(v);
//参数1: popupWindow关联的view
// 参数2和3：相对于关联控件的偏移量popupWindow.showAsDropDown(View anchor, int xoff, int yoff)

2、是否会获取焦点

popupWindow.setFocusable(true);

3、设置背景

 //  popupWindow添加背景色
popupWindow.setBackgroundDrawable(ResourcesCompat.getDrawable(getResources(),R.drawable.img1,getTheme()));

4、关闭

popupWindow.dismiss();

5、设置加载动画

 popupWindow.setAnimationStyle(R.anim.alpha); //设置动画

6、设置触摸使能和popupwindow外部的触摸使能

 popupWindow.setTouchable(true);
popupWindow.setOutsideTouchable(true);

二、实例：

1、新建一个popupwindow要显示使用的xml文件popupview.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"xmlns:app="http://schemas.android.com/apk/res-auto"><androidx.appcompat.widget.AppCompatButtonandroid:id="@+id/mBtn1"android:layout_width="100dp"android:layout_height="50dp"android:text="测试1"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintTop_toTopOf="parent"/><androidx.appcompat.widget.AppCompatButtonandroid:id="@+id/mBtn2"android:layout_width="100dp"android:layout_height="50dp"android:text="测试2"android:layout_marginTop="10dp"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintTop_toBottomOf="@id/mBtn1"/>
</androidx.constraintlayout.widget.ConstraintLayout>

2、在activity中使用：

 @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_tween_anim);Button button=findViewById(R.id.btn);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {popupClick(v);}});}private void popupClick(View v) {
//        添加对应的viewView popupView = getLayoutInflater().inflate(R.layout.popup_view, null);Button mBtn1=popupView.findViewById(R.id.mBtn1);Button mBtn2=popupView.findViewById(R.id.mBtn2);
//        ViewGroup.LayoutParams.WRAP_CONTENT: popupWindow包裹popupView
//        第四个参数为true，点击空白处popupWindow关闭PopupWindow popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT,true);//        popupWindow添加背景色popupWindow.setBackgroundDrawable(ResourcesCompat.getDrawable(getResources(),R.drawable.img1,getTheme()));popupWindow.setAnimationStyle(R.anim.alpha); //设置动画
//        popupWindow.showAsDropDown(v);
//        参数2和参数3是设置偏移量popupWindow.showAsDropDown(v,popupView.getWidth(),-popupView.getHeight());mBtn1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {popupWindow.dismiss();}});mBtn2.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {popupWindow.dismiss();}});}