android-popwindow显示位置不对

private void showAllPopWindow() {
cityId = “0”;
final View popupView = mInflater.inflate(R.layout.activity_recruit_all, null);
View other_view= popupView.findViewById(R.id.other_view);
RecyclerView recyclerView = (RecyclerView) popupView.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
final RecyclerView.Adapter adapter = new CommonAdapter(this, R.layout.activity_recruit_all_item, mCityData) {
@Override
protected void convert(ViewHolder holder, RecruitCityEntity entity, final int position) {
holder.setText(R.id.text, entity.getCityName());
if (mCityData.get(position).isCheck()) {
holder.setTextColor(R.id.text, ContextCompat.getColor(RecruitActivity.this, R.color.theme_gold));
} else {
holder.setTextColor(R.id.text, ContextCompat.getColor(RecruitActivity.this, R.color.black));
}
holder.setOnClickListener(R.id.text, new View.OnClickListener() {
@Override
public void onClick(View view) {
cityId = mCityData.get(position).getId();
for (int i=0;i<mCityData.size();i++)
mCityData.get(i).setCheck(false);
mCityData.get(position).setCheck(true);
notifyDataSetChanged();
if (window!=null)
window.dismiss();
mRefreshLayout.beginRefreshing();
}
});
}
};
recyclerView.setAdapter(adapter);

    other_view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (window!=null)
                window.dismiss();
        }
    });
    window = new CustomPopWindow(popupView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
    window.setOutsideTouchable(true);
    window.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#55000000")));
    window.setFocusable(true);
    window.update();
    window.showAsDropDown(all_tv);

    all_tv.setTextColor(getResources().getColor(R.color.theme_gold));
    all_tv.setCompoundDrawablesWithIntrinsicBounds(null, null, getResources().getDrawable(R.mipmap.city_screen_sel), null);


    window.setOnDismissListener(new PopupWindow.OnDismissListener() {
        @Override
        public void onDismiss() {
            all_tv.setTextColor(getResources().getColor(R.color.black));
            all_tv.setCompoundDrawablesWithIntrinsicBounds(null, null, getResources().getDrawable(R.mipmap.city_screen_no), null);
        }
    });
}

public class CustomPopWindow extends PopupWindow {
public CustomPopWindow(View contentView, int width, int height) {
super(contentView,width,height);
}

/**
 *  在android7.0上，如果不主动约束PopuWindow的大小，比如，设置布局大小为 MATCH_PARENT,那么PopuWindow会变得尽可能大，以至于 view下方无空间完全显示PopuWindow，而且view又无法向上滚动，此时PopuWindow会主动上移位置，直到可以显示完全。
 *　解决办法：主动约束PopuWindow的内容大小，重写showAsDropDown方法：
 * @param anchor
 */
@Override
public void showAsDropDown(View anchor) {
    if(Build.VERSION.SDK_INT >= 24){
        Rect visibleFrame = new Rect();
        anchor.getGlobalVisibleRect(visibleFrame);
        int height = anchor.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom;
        setHeight(height);
    }
    super.showAsDropDown(anchor);

}

}