正在获取选定的单选按钮文本作为字符串

Question

我创建了两个活动，一个用于注册详细信息，另一个用于显示用户输入的值。但当我试图从选定的单选组中获取单选按钮的值时。它不会显示任何错误，但当我在手机中调试和运行时。然后点击注册按钮显示应用程序已停止工作，重新启动消息

我的主要活动.java：

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {

Button signUpButton,signInButton;
TextView userTimeJoining, dateOfBirth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

signInButton = findViewById(R.id.signinbutton);
signInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
signUpButton = findViewById(R.id.signupbutton);
signUpButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent gotoRegAct = new Intent(MainActivity.this, RegistrationActivity.class);
startActivity(gotoRegAct);

}
});
}
}

我的注册活动.java：

import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;
import java.util.Calendar;
public class RegistrationActivity extends AppCompatActivity {

String courseList[] = {"Java","Python", "Android", "Kotlin"};

Button submitButton;
EditText nameOfUser, userGmail, userName, userPassword;
TextView userDateOfBirth, userTimeOfJoining;
Spinner mySpinnerForCourse;
RadioGroup genderSelected;
RadioButton selectedRadiobutton;

String setTime;
String setDate;
String setGender=" ";
int itemNoSelected;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_registration);


submitButton = findViewById(R.id.submitButton);
nameOfUser = findViewById(R.id.nameofuser);
userGmail = findViewById(R.id.usergmail);
userName = findViewById(R.id.username);
userPassword = findViewById(R.id.userpassword);
userDateOfBirth = findViewById(R.id.userdateofbirth);
userTimeOfJoining = findViewById(R.id.usertimeofjoining);
mySpinnerForCourse = findViewById(R.id.usercourse);
genderSelected = findViewById(R.id.usergender);
//This is the code which is not working
int selectedRadioButtonId = genderSelected.getCheckedRadioButtonId();
selectedRadiobutton = (RadioButton) findViewById(selectedRadioButtonId);
setGender = selectedRadiobutton.getText().toString();
ArrayAdapter<String> arrayAdapterForCourse = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item,courseList);
mySpinnerForCourse.setAdapter(arrayAdapterForCourse);
mySpinnerForCourse.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
itemNoSelected = i;
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});

userTimeOfJoining.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Calendar calendar = Calendar.getInstance();
int hh = calendar.get(Calendar.HOUR);
int mm = calendar.get(Calendar.MINUTE);
TimePickerDialog timePickerDialog = new TimePickerDialog(RegistrationActivity.this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int i, int i1) {
setTime = i+" : "+i1;
userTimeOfJoining.setText(setTime);
}
},
hh, mm, false);
timePickerDialog.show();
}
});
userDateOfBirth.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Calendar calendar = Calendar.getInstance();
int dd = calendar.get(Calendar.DAY_OF_MONTH);
int mm = calendar.get(Calendar.MONTH);
int yy = calendar.get(Calendar.YEAR);
DatePickerDialog datePickerDialog = new DatePickerDialog(RegistrationActivity.this, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
setDate = i2+" / "+i1+" / "+i;
userDateOfBirth.setText(setDate);
}
}, yy, mm, dd);
datePickerDialog.show();
}
});
submitButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent gotoShowInfo = new Intent(RegistrationActivity.this, ShowInfo.class);
Bundle bundleforenteredvalue = new Bundle();
bundleforenteredvalue.putString("enteredname",nameOfUser.getText().toString());
bundleforenteredvalue.putString("enteredgmail",userGmail.getText().toString());
bundleforenteredvalue.putString("enteredusername",userName.getText().toString());
bundleforenteredvalue.putString("enteredpassword",userPassword.getText().toString());
bundleforenteredvalue.putString("dateselected",setDate);
bundleforenteredvalue.putString("timeselected",setTime);
bundleforenteredvalue.putString("genderselected",setGender);
bundleforenteredvalue.putString("courseselected",courseList[itemNoSelected]);
gotoShowInfo.putExtras(bundleforenteredvalue);
startActivity(gotoShowInfo);
}
});

}
}

我的ShowInfo.java：

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class ShowInfo extends AppCompatActivity {

TextView nameOfUserEntered, usernameEntered, passwordEntered,gmailEntered, genderSelected, courseSelected, dateOFJoinSelected, timeOfJoinSelected;

Button signInButtonAgain;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_info);
Bundle getValue = getIntent().getExtras();
String getnameentered = getValue.getString("enteredname");
String getenteredGmail = getValue.getString("enteredgmail");
String getenteredUsername = getValue.getString("enteredusername");
String getenteredPassword = getValue.getString("enteredpassword");
String getdateSelected = getValue.getString("dateselected");
String gettimeSelected = getValue.getString("timeselected");
String getgenderSelected = getValue.getString("genderselected");
String getcourseSelected = getValue.getString("courseselected");

nameOfUserEntered = findViewById(R.id.nameofuserentered);
usernameEntered = findViewById(R.id.usernameentered);
passwordEntered = findViewById(R.id.passwordentered);
gmailEntered = findViewById(R.id.gmailentered);
genderSelected = findViewById(R.id.genderselected);
courseSelected = findViewById(R.id.courseselected);
dateOFJoinSelected = findViewById(R.id.dateofjoinselected);
timeOfJoinSelected = findViewById(R.id.timeofjoinselected);
signInButtonAgain = findViewById(R.id.signinbuttonagain);
nameOfUserEntered.setText("Welcome "+ getnameentered);
usernameEntered.setText("Your username is "+getenteredUsername);
passwordEntered.setText("Your password is "+getenteredPassword);
gmailEntered.setText("Your gmail is "+getenteredGmail);
genderSelected.setText("Your gender is the "+getgenderSelected);
courseSelected.setText("You selected for the "+getcourseSelected+" Course");
dateOFJoinSelected.setText("your joinig date is "+getdateSelected);
timeOfJoinSelected.setText("Time of your duty is starts from "+gettimeSelected);
signInButtonAgain.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent gotoMainmenu = new Intent(ShowInfo.this, MainActivity.class);
startActivity(gotoMainmenu);
}
});

}
}

在注册活动中，我添加了一条评论，只通过我的应用程序显示错误消息的代码。如果我删除了radiobutton代码和getString字符串。它工作正常，然后它不会显示应用程序停止工作的消息。所以为什么我不能将radiobutton字符串的值从一个活动传递到另一个活动。

Answer 1

如果在单选组中未选择任何值，则尝试这可能是您的单选按钮id返回-1。

int chk_gender = rg_gender.getCheckedRadioButtonId();
if (chk_gender != -1) {
Gender = ((RadioButton)findViewById(chk_gender)).getText().toString();
}
else
{
Gender = "";
}

已编辑

rg_gender.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (checkedId != -1) {
Gender = ((RadioButton)findViewById(checkedId)).getText().toString();
}
else
{
Gender = "";
}
}
});

Answer 2

在您的xml布局中，您是否选中了TRUE任何单选按钮？您应该在单击提交按钮时获得选定的单选按钮值。它将用最新的值更新您的setGender字符串。对于您的应用程序崩溃，请在应用程序崩溃时发布您的logcat错误。