Popwindow 自定义工具

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public class PopwindowUtils {

    public static PopupWindow pw_deviceAdd;
    public static void ShowDeviceAddDilog(final Context context, View view, final Activity activity) {
        View contentview = LayoutInflater.from(context).inflate(R.layout.pupwindow_device_add, null);
        TextView tv_cancel = contentview.findViewById(R.id.pop_device_add_tv_cancel);
        TextView tv_commit = contentview.findViewById(R.id.pop_device_add_tv_commit);
        final EditText edt = contentview.findViewById(R.id.pop_device_add_edt);
        tv_cancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (pw_deviceAdd!=null&&pw_deviceAdd.isShowing()) {
                    pw_deviceAdd.dismiss();
                }
            }
        });
        tv_commit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!EditStringUtils.isEmpty(edt.getText().toString())){
                    ToastUtils.newToast(context,"添加设备号为："+edt.getText());
                    pw_deviceAdd.dismiss();

                }else {
                    ToastUtils.newToast(context,"设备号不能为空");
                }
            }
        });
        int width=activity.getWindowManager().getDefaultDisplay().getWidth()*3/4;
        pw_deviceAdd=new PopupWindow(contentview, width, WindowManager.LayoutParams.WRAP_CONTENT, true);
        setBackgroundHalfcolor(0.6f,activity);
        pw_deviceAdd.showAsDropDown(view,width/6,20);//这里进行了操作，将剩余的1/4的宽度平分在了popwindow的两侧，看起来就居中了。
        pw_deviceAdd.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                setBackgroundHalfcolor(1f,activity);
            }
        });
    }
    public static void setBackgroundHalfcolor(float bgpha,Activity activity){//
//        float bgAlpha=0.6f;半透明,1f为全透明
        WindowManager.LayoutParams lp =activity.getWindow().getAttributes();
        lp.alpha = bgpha; //0.0-1.0
        activity.getWindow().setAttributes(lp);
    }
}