java - 按下警报对话框按钮始终返回 0 值

Question

所以，我想在弹出警报对话框时检测用户按下的按钮。这是我的代码。

public class AlertUtils {

    private int BTN_PRESSED;

    private AlertDialog.Builder builder;

    public AlertUtils(Context context){
        builder = new AlertDialog.Builder(context);
    }

    public int ShowAlertWithTwoButtons(String Title,String Message,String PositiveButtonText,
                                        String NegativeButtonText){
        builder.setTitle(Title);
        builder.setMessage(Message);

        builder.setPositiveButton(PositiveButtonText, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                BTN_PRESSED = i;
            }
        });

        builder.setNegativeButton(NegativeButtonText, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                BTN_PRESSED = i;
                dialogInterface.dismiss();
            }
        });

        builder.show();
        return BTN_PRESSED;
    }
}

通过调用ShowAlertWithTwoButtons方法，返回int值来检测按下的正向或负向按钮。我的问题是，当我从警报对话框中选择时，它给了我默认 0 值，当我再次打开警报对话框时，它返回正确的值。

Answer 1

按这个方法试试。像这样创建AlertUtils 类。

public class AlertUtils {
private AlertDialog.Builder builder;
private AlertDialogListener alertDialogListener;

// Interface to send back the response of click
interface AlertDialogListener {
    void onClick(int a);
}

public AlertUtils(Context context, AlertDialogListener alertDialogListener) {
    builder = new AlertDialog.Builder(context);
    this.alertDialogListener = alertDialogListener;
}

public void ShowAlertWithTwoButtons(String Title, String Message, String PositiveButtonText,
                                    String NegativeButtonText) {
    builder.setTitle(Title);
    builder.setMessage(Message);
    builder.setPositiveButton(PositiveButtonText, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            // if you want to pass the actual value of i,then pass the i in onClick or if you want 1 on 
            // positive button click then pass 1 here.
            alertDialogListener.onClick(1);
        }
    });
    builder.setNegativeButton(NegativeButtonText, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            // if you want to pass the actual value of i, then pass the i in onClick or if you want 1 on 
            // negative button click then pass 0 here.
            alertDialogListener.onClick(0);
            dialogInterface.dismiss();
        }
    });
    builder.show();
}

}

在需要的地方以这种方式调用对话框。

  AlertUtils alertUtils = new AlertUtils(getContext(), new AlertUtils.AlertDialogListener() {
        @Override
        public void onClick(int a) {
            if (a == 1) {
                // Do your work on Positive button click
            } else {
                // Do your work on Negative button click
            }
        }
    });
    alertUtils.ShowAlertWithTwoButtons("Alert Dialog", "Alert Dialog Description ", "Positive", "Negative");