Android Dialog在底部显示且宽度match_parent

@Overrideprotected void onCreate(Bundle savedInstanceState) {    requestWindowFeature(Window.FEATURE_NO_TITLE);    super.onCreate(savedInstanceState);    setContentView(getLayoutResId());    getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);    getWindow().setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL);    getWindow().setBackgroundDrawable(null);    getWindow().setWindowAnimations(R.style.PopupAnimation);}