如图

代码

    private void openPopupWindow(View v) {
        //如果已经显示了，就不要显示了
        if (popupWindow != null && popupWindow.isShowing()) {
            return;
        }
        //自定义显示按钮
        View view = LayoutInflater.from(this).inflate(R.layout.avatar_menu_layout, null);
        popupWindow = new PopupWindow(view, RelativeLayout.LayoutParams.MATCH_PARENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        //设置背景
        popupWindow.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#99000000")));
        //设置点击弹窗外隐藏自身
        popupWindow.setFocusable(true);
        popupWindow.setOutsideTouchable(true);
        //弹出动画
        popupWindow.setAnimationStyle(R.style.PopupWindow);
        //显示位置
        popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight);
        popupWindow.setOnDismissListener(() -> setBackgroundAlpha(1.0f));
        initPopEvent(view);
        //设置背景色
        setBackgroundAlpha(0.5f);
    }

相关代码

• 布局代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:orientation="vertical">

        <TextView
            android:id="@+id/take_photo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:background="@drawable/selector_circle_conner_item_bg"
            android:gravity="center"
            android:padding="16dp"
            android:text="@string/take_photo_text"
            android:textColor="@color/text_666666"
            android:textSize="15sp" />


        <TextView
            android:id="@+id/take_photo_from_album"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:background="@drawable/selector_circle_conner_item_bg"
            android:gravity="center"
            android:padding="16dp"
            android:text="@string/select_from_album_text"
            android:textColor="@color/text_666666"
            android:textSize="15sp" />

        <TextView
            android:id="@+id/save_photo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:background="@drawable/selector_circle_conner_item_bg"
            android:gravity="center"
            android:padding="16dp"
            android:text="@string/save_image_text"
            android:textColor="@color/text_666666"
            android:textSize="15sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/cancel"
        android:layout_margin="8dp"
        android:background="@drawable/selector_circle_conner_item_bg">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:padding="16dp"
            android:text="@string/btn_cancel"
            android:textColor="@color/text_666666"
            android:textSize="15sp" />
    </LinearLayout>
</LinearLayout>

string.xml

 <string name="avatar_title_text">个人头像</string>
 <string name="take_photo_text">拍照</string>
 <string name="select_from_album_text">从相册选择</string>
 <string name="save_image_text">保存图片</string>
 <string name="take_avatar_text">头像拍照</string>

• style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--进出动画-->
    <style name="PopupWindow">
        <item name="android:windowEnterAnimation">@anim/window_in</item>
        <item name="android:windowExitAnimation">@anim/window_out</item>
    </style>
</resources>

• windown_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="200"
        android:fromYDelta="100%"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toYDelta="0" />
    <alpha
        android:duration="200"
        android:fromAlpha="0"
        android:toAlpha="1" />
</set>

• window_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="200"
        android:fromYDelta="0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toYDelta="100%" />
    <alpha
        android:duration="200"
        android:fromAlpha="1"
        android:toAlpha="0" />
</set>

点击事件

    private void initPopEvent(View view) {
        view.findViewById(R.id.take_photo).setOnClickListener(v -> {
            //跳转到拍照界面，拍完照片回来，上传照片
             if (popupWindow != null) {
                popupWindow.dismiss();
            }
        });
        view.findViewById(R.id.take_photo_from_album).setOnClickListener(v -> {
            if (popupWindow != null) {
                popupWindow.dismiss();
            }
        });

        view.findViewById(R.id.save_photo).setOnClickListener(v -> {
            //TODO:
        });
        view.findViewById(R.id.cancel).setOnClickListener(v -> {
            if (popupWindow != null) {
                popupWindow.dismiss();
            }
        });
    }

设置背景透明度

    public void setBackgroundAlpha(float alpha) {
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = alpha;
        getWindow().setAttributes(lp);
    }

以上，复制粘贴，就够用了。

来个弹窗，水个文章。