Android PopUpWindow实现卡片式弹窗

首先自定义一个viewgroup，继承自linerlayout，为了实现上下滑动

//用于实现顶部弹窗动画  以及向上滑动动画
public class toptipslinearlayout extends linearlayout {

    private static final string tag = "hyh";

    private int mheight;
    private boolean misfirstlayout=true;
    private boolean mispalyinganimation=false;
    private int mlasty=0;
    private int mlastx=0;
    private final int mtouchslop = 4;
    private final long single_click_time = 300;
    private long begintiem=0;
    private boolean mismoving=false;

    public toptipslinearlayout(context context) {
        super(context);
    }

    public toptipslinearlayout(context context, @nullable attributeset attrs) {
        super(context, attrs);
    }

    public toptipslinearlayout(context context, @nullable attributeset attrs, int defstyleattr) {
        super(context, attrs, defstyleattr);
    }

    @requiresapi(api = build.version_codes.lollipop)
    public toptipslinearlayout(context context, attributeset attrs, int defstyleattr, int defstyleres) {
        super(context, attrs, defstyleattr, defstyleres);
    }

    @override
    protected void onlayout(boolean changed, int l, int t, int r, int b) {
        super.onlayout(changed, l, t, r, b);
        if(misfirstlayout) {
            mheight = getheight();
            misfirstlayout = false;
        }
    }

    @override
    public boolean onintercepttouchevent(motionevent ev) {
        return super.onintercepttouchevent(ev);
    }

    @suppresslint("clickableviewaccessibility")
    @override
    public boolean ontouchevent(motionevent event) {

        switch (event.getaction()) {
            case motionevent.action_down:
                mismoving = false;
                begintiem = system.currenttimemillis();
                break;
            case motionevent.action_move:
                int deltay = (int)event.getrawy() - mlasty;
                if(!mispalyinganimation) {
                    if(deltay < 0 || gettranslationy() + deltay <= 0) {
                        settranslationy(gettranslationy() + deltay);
                    }
                }
                if(ismove(event.getrawx(), event.getrawy())) {
                    mismoving = true;
                }
                break;
            case motionevent.action_up:
                if(system.currenttimemillis() - begintiem <= single_click_time && !mismoving) {
                    performclick();
                }
                mismoving = false;
                if(math.abs(gettranslationy()) <= (float) mheight/3) {
                    settranslationy(0);
                } else {
                    fadeoutanimator(200);
                }
                break;
        }
        mlasty = (int)event.getrawy();
        mlastx = (int)event.getrawx();
        return true;
    }

    private boolean ismove(float curx,float cury) {
        return math.abs(curx - mlastx) >= mtouchslop || math.abs(cury - mlasty) >= mtouchslop;
    }

    public void showenteranimator(long time) {
        setvisibility(visible);
        //向下移动动画
        translateanimation downtranslateanimation=new translateanimation(0,0,-mheight, 0);
        downtranslateanimation.setduration(time);
        downtranslateanimation.setfillafter(true);

        mispalyinganimation = true;
        startanimation(downtranslateanimation);

        downtranslateanimation.setanimationlistener(new animation.animationlistener() {
            @override
            public void onanimationstart(animation animation) {

            }

            @override
            public void onanimationend(animation animation) {
                mispalyinganimation = false;
            }

            @override
            public void onanimationrepeat(animation animation) {

            }
        });
    }

    public void fadeoutanimator(long time) {
        if(mismoving) {
            postdelayed(new runnable() {
                @override
                public void run() {
                    fadeoutanimator(300);
                }
            }, 1500);
            return ;
        }
        //向上移动动画
        translateanimation downtranslateanimation=new translateanimation(0,0,0, -mheight - gettranslationy());
        downtranslateanimation.setduration(time);
        downtranslateanimation.setfillafter(true);

        mispalyinganimation = true;
        startanimation(downtranslateanimation);

        //动画监听
        downtranslateanimation.setanimationlistener(new animation.animationlistener() {
            @override
            public void onanimationstart(animation animation) {}
            @override
            public void onanimationend(animation animation){
                setvisibility(gone); //动画结束 消除视图
                mispalyinganimation = false;
            }
            @override
            public void onanimationrepeat(animation animation) {}
        });
    }

    @override
    protected void onattachedtowindow() {
        super.onattachedtowindow();
    }
}

定义一个layout文件

<?xml version="1.0" encoding="utf-8"?>
<com.example.randfood.customview.toptipslinearlayout
    android:id="@+id/top_tips_root"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_marginleft="16dp"
    android:layout_marginright="16dp"
    android:visibility="invisible">

    <textview
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="这是一个消息弹窗"
        android:layout_gravity="center_horizontal"
        android:textsize="30sp"
        android:padding="20dp"
        android:background="@drawable/messageview_top_pop_bg"/>

</com.example.randfood.customview.toptipslinearlayout>

调用下面的方法即可

private static void initpopupwindow(context context, view parentview) {
        view view = view.inflate(context, r.layout.messageview_top_pop, null);
        popupwindow popupwindow = new popupwindow(view, viewgroup.layoutparams.wrap_content,
                viewgroup.layoutparams.wrap_content, false);
        popupwindow.setbackgrounddrawable(new colordrawable(color.transparent));
        popupwindow.setoutsidetouchable(false);
        //让popupwindow可以显示在状态栏中
        popupwindow.setclippingenabled(false);
//        popupwindow.settouchable(true);
        popupwindow.showatlocation(parentview, gravity.top, 0, 0);
        toptipslinearlayout layout = view.findviewbyid(r.id.top_tips_root);
        //让viewgroup中的内容显示在状态栏下面
        layout.setpadding(0, displayutil.getstatusbarheight(context), 0, 0);
        layout.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
                toast.maketext(context, "你点击了顶部消息", toast.length_short).show();
            }
        });
        layout.post(new runnable() {
            @override
            public void run() {
                layout.showenteranimator(300);
            }
        });
        layout.postdelayed(new runnable() {
            @override
            public void run() {
                layout.fadeoutanimator(300);
            }
        }, 5000);
    }

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