底部彈出 Dialog
===

AlertDialog dialog = new AlertDialog.Builder(MainActivity.this)
    .setTitle("title")
    .setMessage("message")
    .create();  
Window window = dialog.getWindow();  
window.setGravity(Gravity.BOTTOM);  //此处可以设置dialog显示的位置   
window.setWindowAnimations(R.style.dialog_bottom_popup);  //添加动画 
dialog.show(); 

* `themes.xml`

...

<style name="dialog_bottom_popup" parent="android:Animation">
    <item name="android:windowEnterAnimation">@anim/nav_default_enter_anim</item>
    <item name="android:windowExitAnimation">@anim/nav_default_exit_anim</item>
</style>

...

## Ref.
[android开发(31) 动画演示 - 从页面底部向上弹出dialog，消失时逐渐向下](https://juejin.cn/post/6976955748320444424)

###### tags: `Dialog`