设置dialog的大小，位置

Window dialogWindow = this.getWindow();
WindowManager windowManager = dialogWindow.getWindowManager();
Display display = windowManager.getDefaultDisplay();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
lp.width = (int)(display.getWidth()); //设置宽度
lp.height = (int)(display.getHeight()); //设置高度

dialogWindow.setGravity(Gravity.BOTTOM);//设置位置

dialogWindow.setWindowAnimations(R.style.timepopwindow_anim_style); //设置窗口弹出动画

setCanceledOnTouchOutside(true);//点击dialog外部，dialog消失

<style name="timepopwindow_anim_style">
<item name="android:windowEnterAnimation">@anim/timepicker_anim_enter_bottom</item> <!-- 指定显示的动画xml -->
<item name="android:windowExitAnimation">@anim/timepicker_anim_exit_bottom</item> <!-- 指定消失的动画xml -->
</style>

/**anim timepicker_anim_enter_bottom*/
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromYDelta="100%" android:toYDelta="0" android:duration="500" />
</set>

//timepicker_anim_exit_bottom
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromYDelta="0" android:toYDelta="100%" android:duration="500" />
</set>