android--自定義ProgressDialog顯示位置(其它Dialog子類都可以設置)

1、一般情況下，系統默認的Dialog顯示位置為屏幕居中：

	pbDialog = new ProgressDialog(MainActivity.this);
	pbDialog.setMessage("請稍等，加載中");
	pbDialog.show();

2、設置Dialog顯示位置在屏幕底部：

	pbDialog = new ProgressDialog(MainActivity.this);
	pbDialog.setMessage("請稍等，加載中");

	WindowManager.LayoutParams params = pbDialog.getWindow().getAttributes();
	pbDialog.getWindow().setGravity(Gravity.BOTTOM);
	pbDialog.show();

3、設置Dialog顯示位置在屏幕底部，並且距離底部100px:

	pbDialog = new ProgressDialog(MainActivity.this);
	pbDialog.setMessage("請稍等，加載中");

	WindowManager.LayoutParams params = pbDialog.getWindow().getAttributes();
	pbDialog.getWindow().setGravity(Gravity.BOTTOM);
	params.y = 100;
	pbDialog.getWindow().setAttributes(params);
	pbDialog.show();