Question

我有一个弹出对话框，询问用户输入。

一旦用户输入他/她的输入然后单击“确定”，我希望片段将用户输入传递回对话框后面的活动。

我读过有关onDismiss(DialogInterface dialog)的内容。但是，作为Java和Android的新学习者，我无法正确实现它：

处理程序永远不会在我的代码中运行。
即使在处理程序运行之后，我仍然不知道如何从参数dialog获取用户输入，因为它是DialogInterface类型，我不知道如何处理。

以下是我的代码段。

活动方：

    public class CalibrationActivity extends Activity implements SensorEventListener, DialogInterface.OnDismissListener {

    ...

    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_calibration);

            buttonInit();
            sensorInit();
        }


        private void buttonInit() {

            // start calibrating button
            startCalibratingButton = (Button) findViewById(R.id.button1);
            startCalibratingButton.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {

                    startCalibrationFlag = true;

                    Toast.makeText(CalibrationActivity.this, "Please walk " + Constant.CALIBRATION_STEP_NUMBER + " steps and press the 'Done Calibrating' button", Toast.LENGTH_SHORT).show();
                    startCalibratingButton.setEnabled(false);
                    doneCalibratingButton.setEnabled(true);
                }
            });

            // done calibrating button
            doneCalibratingButton = (Button) findViewById(R.id.button2);
            doneCalibratingButton.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {

                    startCalibrationFlag = false;

                    RequireDistanceDialogFragment requireDistanceDialogFragment = new RequireDistanceDialogFragment();
                    requireDistanceDialogFragment.setCancelable(false);
                    requireDistanceDialogFragment.show(getFragmentManager(), ALARM_SERVICE); // dialog pops up that leads the new user to calibrate

                // Error Here: "The method setOnDismissListener(new OnDismissListener(){}) is undefined for the type RequireDistanceDialogFragment"
                    requireDistanceDialogFragment.setOnDismissListener(new OnDismissListener() {

                        public void onDismiss(DialogInterface dialog) {
                            LoadingActivity.this.finish();
                        }
                    });

                }
            });

            startCalibratingButton.setEnabled(true);
            doneCalibratingButton.setEnabled(false);
        }

        // called when the dialog is dismissed
        public void onDismiss(DialogInterface requireDistanceDialogFragment) {

// Error Here: The method getDistanceEntered() is undefined for the type DialogInterface
                double userInput = requireDistanceDialogFragment.getDistanceEntered();
                processTheUserInputHere();

        }

    }

对话方：

package com.example.drsystem;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.Editable;
import android.text.InputType;
import android.widget.EditText;
import android.widget.Toast;

public class RequireDistanceDialogFragment extends DialogFragment {

    private Editable distance;
    private boolean distanceIsEntered = false;

    public Dialog onCreateDialog(Bundle savedInstanceState) {

        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        final EditText input = new EditText(getActivity());
        input.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);

        builder.setTitle("Distance is required to calibrate the stride length estimation.").setMessage("Distance (in m) for these " + Constant.CALIBRATION_STEP_NUMBER + " steps?").setView(input).setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int whichButton) { // click ok

                distanceIsEntered = true;
                distance = input.getText();
            }
        }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int whichButton) { // click cancel

                Toast.makeText(getActivity(), "Calibration not done", Toast.LENGTH_SHORT).show();
            }
        });

        // Create the AlertDialog object and return it
        return builder.create();
    }

    // if the user has not entered the distance yet, the distance returned is -1
    public double getDistanceEntered() {

        if (distanceIsEntered)
            return Double.parseDouble(distance.toString());
        else
            return -1;
    }

}

您可以通过解决我遇到的两个问题来帮助我修改

或者您可以提出新的方法来实现这一目标。

Answer 1

对话框中的onClickMethod应将输入放在消息中

builder.setMessage（＆＃34;来自用户的消息＆＃34;）;

你的onDismiss监听器应该在对话之前从对话框中获取数据

public void onDismiss（DialogInterface dialog）{ String messageFromUser = dialog.getMessage（＆＃34;你想要的字符串＆＃34;）; LoadingActivity.this.finish（）; }

为什么要完成装载活动？

将用户输入从警报对话框传递给活动，并在对话框在Android中解散时处理它？

1 个答案: