布局：

main：

<Button    android:id="@+id/btn" android:layout_width="match_parent" android:layout_height="wrap_content" />

pop：

<ImageView    android:id="@+id/iv" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@mipmap/ic_launcher" />

代码：

package com.example.my_popwindow_donghua;

import android.os.Bundle;import android.support.v7.app.ActionBar;import android.support.v7.app.AppCompatActivity;import android.view.LayoutInflater;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.Button;import android.widget.ImageView;import android.widget.PopupWindow;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {private PopupWindow popupWindow; private Button btn; private ImageView iv;

 @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView();

 }

private void initView() {btn = (Button) findViewById(R.id.btn);

 View inflate = LayoutInflater.from(this).inflate(R.layout.pop, null); iv = (ImageView) inflate.findViewById(R.id.iv); popupWindow = new PopupWindow(inflate, ActionBar.LayoutParams.WRAP_CONTENT, ActionBar.LayoutParams.WRAP_CONTENT); btn.setOnClickListener(this); }

@Override public void onClick(View v) {switch (v.getId()) {case R.id.btn:// AlphaAnimation alphaAnimation = new AlphaAnimation(1,0);

// alphaAnimation.setDuration(2000); Animation alphaAnimation = AnimationUtils.loadAnimation(this,R.anim.bib); iv.startAnimation(alphaAnimation);

 if (popupWindow.isShowing()){

popupWindow.dismiss();

 }else {

popupWindow.showAsDropDown(btn); }

break; } }}