PopupWindow的简单使用

package com.loaderman.popupwindowdemo;

import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.PopupWindow;

public class MainActivity extends Activity {

    private Button btnPop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnPop = (Button) findViewById(R.id.btn_Pop);
    }
    public void showPopupWindow(View v) {
        View view = View.inflate(this, R.layout.layout_pop, null);
        PopupWindow popup = new PopupWindow(view, v.getWidth(), 150, true);//设置尺寸及获取焦点
        //必须设置背景色,不然不会消失
        popup.setBackgroundDrawable(new ColorDrawable(Color.GRAY));//设置背景颜色
        // 设置进入退出动画
        popup.setAnimationStyle(R.style.PopAnimation);
        // 显示在某个控件的正下方
        popup.showAsDropDown(btnPop, 0, 0);
        //显示在屏幕的位置
        // popup.showAtLocation(rlRoot, Gravity.LEFT + Gravity.TOP, 0,0);
    }

}

 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.loaderman.popupwindowdemo.MainActivity">
    <Button
        android:onClick="showPopupWindow"
        android:id="@+id/btn_Pop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="点我显示PopupWindow"/>
</RelativeLayout>

layout_pop.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:padding="5dp"
              android:layout_width="match_parent"
              android:layout_height="150dp">
  <TextView
      android:padding="5dp"
      android:layout_width="match_parent"
      android:text="测试一"
      android:textColor="#fff"
      android:layout_height="wrap_content"/>
    <View
        android:layout_width="match_parent"
        android:background="#ccc"
        android:layout_height="1dp"/>
    <TextView
        android:textColor="#fff"
        android:padding="5dp"
        android:layout_width="match_parent"
        android:text="测试一"
        android:layout_height="wrap_content"/>
    <View
        android:layout_width="match_parent"
        android:background="#ccc"
        android:layout_height="1dp"/>
    <TextView
        android:textColor="#fff"
        android:padding="5dp"
        android:layout_width="match_parent"
        android:text="测试一"
        android:layout_height="wrap_content"/>
</LinearLayout>

在values/style中:

    <!-- PopupWindow动画 -->
    <style name="PopAnimation">
        <item name="android:windowEnterAnimation">@anim/pop_enter</item>
        <item name="android:windowExitAnimation">@anim/pop_exit</item>
    </style>

在res/anim文件下创建进入退出动画

pop_enter.xml

<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:shareInterpolator="false" >

    <translate
        android:duration="400"
        android:fromXDelta="100%p"
        android:interpolator="@android:interpolator/overshoot"
        android:toXDelta="0" />

    <alpha
        android:duration="400"
        android:fromAlpha="0.2"
        android:toAlpha="1.0" />
</set>

 pop_exit.xml

<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:shareInterpolator="false" >

    <translate
        android:duration="400"
        android:fromXDelta="0"
        android:interpolator="@android:interpolator/anticipate"
        android:toXDelta="100%p" />
    <alpha
        android:duration="400"
        android:fromAlpha="1.0"
        android:toAlpha="0.0" />

</set>

 效果图: