PopWindow是一个可以在Activity 之上显示任意View的控件。
PopWindow可自定义进出动画、显示位置，根据已有视图对齐显示，可谓弹框一哥。

实例：在按钮上面显示

pop.gif

一、创建及配置

加载视图-->创建对象-->初始设置

1.代码

//1.加载视图
View popView = LayoutInflater.from(this).inflate(R.layout.pop_show, null);//2.创建对象
mPopupWindow = new PopupWindow();
//3.初始设置
mPopupWindow.setContentView(popView);//设置视图
mPopupWindow.setWidth(300);//设置宽
mPopupWindow.setHeight(500);//设置高
//        //等价于上面四句
//        mPopupWindow = new PopupWindow(popView,
//                LinearLayout.LayoutParams.MATCH_PARENT,
//                LinearLayout.LayoutParams.MATCH_PARENT);
mPopupWindow.setFocusable(true);//可聚焦--默认true
mPopupWindow.setTouchable(true);//可触碰--默认true
mPopupWindow.setOutsideTouchable(true);//点外部消失
//在安卓4.4(API 19)测试需要背景(这里是一个透明色)才能点外部消失，安卓8.1(API 27)则不需要
mPopupWindow.setBackgroundDrawable(ContextCompat.getDrawable(this, R.color.transparent));
//4.设置动画样式：
mPopupWindow.setAnimationStyle(R.style.slide_anim);//设置mPopWindow进出动画

2.动画样式：

默认动画是忽然出现，忽然消失的

values/styles.xml

<style name="slide_anim"><item name="android:windowEnterAnimation">@anim/slide_up</item><item name="android:windowExitAnimation">@anim/slide_down</item>
</style>

anim/slide_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"><!--划下：--><translateandroid:duration="200"android:fromYDelta="0"android:toYDelta="100%"/>
</set>

anim/slide_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" ><!--划上：--><translateandroid:duration="200"android:fromYDelta="100%"android:toYDelta="0" />
</set>

二、显示与隐藏

//显示的适配
CompatShowPop.handle(mPopupWindow, mButton, CompatShowPop.BOTTOM2TOP);
mPopupWindow.dismiss();//消失

/*** 作者：张风捷特烈<br/>* 时间：2018/11/1 0001:10:40<br/>* 邮箱：1981462002@qq.com<br/>* 说明：以View确定popWindow适配*/
public class CompatShowPop {//pop顶对顶public static final int TOP2TOP = 0x01;//pop顶对底public static final int TOP2BOTTOM = 0x02;//pop底对顶public static final int BOTTOM2TOP = 0x03;/*** 以View确定popWindow适配** @param popupWindow popupWindow* @param view        view* @param type        类型*/public static void handle(PopupWindow popupWindow, View view, int type) {//处理PopWindow7.0适配if (Build.VERSION.SDK_INT < 24) {switch (type) {case TOP2TOP:popupWindow.showAsDropDown(view, 0, -view.getHeight());break;case TOP2BOTTOM:popupWindow.showAsDropDown(view, 0, 0);break;case BOTTOM2TOP:
//                    popupWindow.showAsDropDown(view, 0, -view.getHeight() - popupWindow.getHeight());popupWindow.showAtLocation(view, Gravity.CLIP_HORIZONTAL, 0, 0);}} else {int[] location = new int[2];view.getLocationOnScreen(location);int x = location[0];int y = location[1];switch (type) {case TOP2TOP:popupWindow.showAtLocation(view, Gravity.NO_GRAVITY, x, y);break;case TOP2BOTTOM:popupWindow.showAtLocation(view, Gravity.NO_GRAVITY, x, y + view.getHeight());break;case BOTTOM2TOP:
//                    popupWindow.showAtLocation(view, Gravity.CLIP_HORIZONTAL, 0, 0);popupWindow.showAtLocation(view, Gravity.NO_GRAVITY, x, y - popupWindow.getHeight());}}}
}

三、PopupWindow的简单封装

/*** 作者：张风捷特烈<br/>* 时间：2018/11/1 0001:11:42<br/>* 邮箱：1981462002@qq.com<br/>* 说明：PopupWindow的封装*/
public abstract class BasePopWindow extends PopupWindow {private View mRootView;private Context mContext;private SparseArray<View> mViews;public BasePopWindow(Context context) {this(context, -1);}public BasePopWindow(Context context, int animStyleId) {mContext = context;//获取屏幕尺寸WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);DisplayMetrics outMetrics = new DisplayMetrics();wm.getDefaultDisplay().getMetrics(outMetrics);mRootView = LayoutInflater.from(context).inflate(layoutId(), null);mViews = new SparseArray<>();//基本设置setContentView(mRootView);setWidth(outMetrics.widthPixels);setHeight(outMetrics.heightPixels);setFocusable(true);setTouchable(true);setOutsideTouchable(true);//沉浸标题栏,全屏显示setClippingEnabled(false);setBackgroundDrawable(new BitmapDrawable());if (animStyleId != -1) {setAnimationStyle(animStyleId);//设置mPopWindow进出动画}}/*** 通过viewId获取控件** @param viewId pop里的控件id* @param <T>    控件视图* @return 控件视图*/public <T extends View> T getView(int viewId) {View view = mViews.get(viewId);if (view == null) {view = mRootView.findViewById(viewId);mViews.put(viewId, view);}return (T) view;}public abstract int layoutId();
}

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3.声明

1----本文由张风捷特烈原创,转载请注明
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