AlertDialog里面有EditText，希望弹出对话框的时候弹出软键盘

final AlertDialog builderAd = new AlertDialog.Builder(context, R.style.my_dialog).create();
        builderAd.show();
        

        //只用下面这一行弹出对话框时需要点击输入框才能弹出软键盘 
        builderAd.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
        //加上下面这一行弹出对话框时软键盘随之弹出 
        builderAd.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
       
       
       
        builderAd.getWindow().setContentView(viewAd);
        builderAd.setCancelable(false);