popwindow+动画

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;
        }
    }
}