PopupWindow

1.步骤

①创建PopupWindow布局
②创建PopupWindow对象，用三个参数的构造
③PopupWindow四种显示方式
④聚焦：EditText能输入内容
⑤点击范围外关闭PopupWindow
⑥全屏阴影，PopupWindow点击消失监听
⑦进出场动画

 private void showPoP() {
        View view = LayoutInflater.from(this).inflate(R.layout.layout_pop, null);
        PopupWindow window = new PopupWindow(view, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        //点击范围外关闭
        window.setBackgroundDrawable(new ColorDrawable());
        window.setBackgroundDrawable(new BitmapDrawable());
        window.setOutsideTouchable(true);
        //进出场动画
        window.setAnimationStyle(R.style.pop_animation_style);
        //聚焦
        window.setFocusable(true);
        //四种显示方式
        window.showAsDropDown(button);
        window.showAsDropDown(button,200,200);
        window.showAsDropDown(cl, Gravity.BOTTOM,0,0);
        window.showAtLocation(rv, Gravity.BOTTOM, 0, 0);
        //设置阴影
        setBackGroundAlpha(0.5f);
        //PopupWindow点击消失监听
        window.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                setBackGroundAlpha(1f);//0.0-1  从完全透明  到  不透明
            }
        });
    }
    //设置阴影
    private void setBackGroundAlpha(float alpha){
        WindowManager.LayoutParams attributes = getWindow().getAttributes();
        attributes.alpha=alpha;
        getWindow().setAttributes(attributes);
    }

style:

<style name="pop_animation_style">
        <item name="android:windowEnterAnimation">@anim/enter</item>
        <item name="android:windowExitAnimation">@anim/exit</item>
</style>

anim_exit.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1500">
    <translate
        android:fromXDelta="0"
        android:fromYDelta="0"
        android:toXDelta="100%p"
        android:toYDelta="100%p" />
    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0" />
</set>

anim_enter.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1500">
    <translate
        android:fromXDelta="100%p"
        android:fromYDelta="100%p"
        android:toXDelta="0"
        android:toYDelta="0" />
    <alpha
        android:fromAlpha="0"
        android:toAlpha="1.0" />
</set>