我有一个要求用户输入的弹出对话框。
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。
我读过一些关于onDismiss(DialogInterface dialog). 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中获取用户输入
dialog，因为它是 typeDialogInterface，我不知道如何处理。
下面是我的代码片段。
活动方面：
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();
}
}
对话端：
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它
或者你可以提出新的方法来实现这一点。