如果自定义DialogFragment宽高需要自适应(即View ---wrap_content)

   @Override
    public void onStart() {
        super.onStart();
        Dialog dialog = getDialog();
        if (dialog != null) {
            dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        }
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        WindowManager.LayoutParams params = getDialog().getWindow()
                .getAttributes();
        params.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;
//        params.windowAnimations = R.style.bottomSheet_animation;//动画
        getDialog().getWindow().setAttributes(params);
        getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        getDialog().setCanceledOnTouchOutside(true);
        getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        return inflater.inflate(R.layout.dialog_seal_notice, container, false);
    }

如果宽高固定值、或者百分比的话，可以这样设置

if (getDialog().getWindow() == null) return;
        DisplayMetrics displayMetrics = new DisplayMetrics();
        getDialog().getWindow().getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        getDialog().getWindow().getAttributes().width = (int) (displayMetrics.widthPixels);
        getDialog().getWindow().getAttributes().height = (int) (displayMetrics.heightPixels*0.7);
        getDialog().getWindow().getAttributes().gravity = Gravity.TOP;