Java 单选按钮在Android中返回错误的值

我有一个表格，一个人可以输入朋友的详细信息（姓名、年龄、性别、地址）。此朋友显示在列表视图中，当单击列表中的朋友时，他们可以选择编辑该记录

我可以成功地更新关于朋友的每一个细节，除了性别

例如：

列表视图：

1) James Bond, 20, Male, Sydney NSW

然后单击“编辑”并将其更改为

James smith, 21, Female, Canberra NSW

然后回到我的列表视图，它将显示：

1) James smith, 21, Male, Canberra NSW

注意到性别没有改变吗

我可以理解为什么会发生这种情况，因为我用同样的逻辑来改变姓名和年龄，就像我改变性别一样

以下是相关代码：

ViewFriend.java

（此类显示列表视图并具有编辑选项）

这就是问题所在，即使用户点击男性，它也会注册为女性，我不确定为什么

---

有什么办法可以解决这个问题吗？

您的问题是将

rb

变量的值设置为一个单选按钮，在这里用先前的性别值预定义

if (gender.equals("Male")){
  rb = (RadioButton)findViewById(R.id.resultGenderMale_update);
}
else if (gender.equals("Female"))
{
  rb = (RadioButton)findViewById(R.id.resultGenderFemale_update);
}

然后你们读取同一个按钮的值。要解决此问题，请单击更新按钮的侦听器，您需要使用单选组（您的

rg

变量）上的

getCheckedRadioButtonId

读取选中的单选按钮id

upd： 这就是编辑好友活动代码的外观

public class EditFriendActivity extends AppCompatActivity {
  private RadioGroup mGenderRadioGroup;
  private Button mUpdateButton;
  private EditText mNameField;
  private EditText mAddressField;
  private NumberPicker mAgePicker;
  private databaseManager4 mDatabaseManager;

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

    mDatabaseManager = new databaseManager4(this);
  }

  private void initUI() {
    Intent intent = getIntent();
    mNameField = (EditText) findViewById(R.id.fullName_update);
    mNameField.setText(intent.getStringExtra("name"));

    mAddressField = (EditText) findViewById(R.id.address_update);
    mAddressField.setText(intent.getStringExtra("address"));

    mAgePicker = (NumberPicker) findViewById(R.id.resultAge_update);
    mAgePicker.setMinValue(6);
    mAgePicker.setMaxValue(110);
    mAgePicker.setWrapSelectorWheel(false);
    mAgePicker.setValue(Integer.parseInt(intent.getStringExtra("age")));

    mUpdateButton = (Button) findViewById(R.id.update_button);
    mUpdateButton.setOnClickListener(updateClickListener);

    mGenderRadioGroup = (RadioGroup) findViewById(R.id.radioGroup_update);

    RadioButton targetRadioButton = null;
    switch (Gender.fromString(intent.getStringExtra("gender"))) {
      case MALE:
        targetRadioButton = (RadioButton) findViewById(R.id.resultGenderMale_update);
        break;
      case FEMALE:
        targetRadioButton = (RadioButton) findViewById(R.id.resultGenderFemale_update);
        break;
    }
    if (targetRadioButton != null) {
      targetRadioButton.setChecked(true);
    }
  }

  public void clear() {
    mNameField.setText("");
    mAddressField.setText("");
  }

  private Gender getSelectedGender() {
    int checkedButtonId = mGenderRadioGroup.getCheckedRadioButtonId();
    switch (checkedButtonId) {
      case R.id.resultGenderMale_update:
        return Gender.MALE;
      case R.id.resultGenderFemale_update:
        return Gender.FEMALE;
    }
    return Gender.UNDEFINED;
  }

  private View.OnClickListener updateClickListener =
      new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          Gender newGender = getSelectedGender();
          int code = Integer.parseInt(getIntent().getStringExtra("code"));
          System.out.println("gender is" + newGender.stringValue);
          if (mDatabaseManager.updateRow(
              code,
              mNameField.getText().toString(),
              mAgePicker.getValue(),
              newGender.stringValue,
              mAddressField.getText().toString())) {
            Toast.makeText(
                    getApplicationContext(),
                    "successfully updated the friend " + ed.getText().toString(),
                    Toast.LENGTH_SHORT)
                .show();
          } else {
            Toast.makeText(
                    getApplicationContext(),
                    "Could not  update the friend " + ed.getText().toString(),
                    Toast.LENGTH_SHORT)
                .show();
          }
          Intent viewFriendsIntent = new Intent(getApplicationContext(), viewFriends.class);
          startActivity(viewFriendsIntent);
          finish();
        }
      };

  private enum Gender {
    UNDEFINED("undefined"),
    MALE("Male"),
    FEMALE("Female");

    private @Nullable String stringValue;

    Gender(@Nullable String stringValue) {
      this.stringValue = stringValue;
    }

    public static Gender fromString(@Nullable String value) {
      if (value != null) {
        for (Gender gender : Gender.values()) {
          if (value.equals(gender.stringValue)) {
            return gender;
          }
        }
      }
      return UNDEFINED;
    }
  }
}

---

我不太明白。。。我添加了int id=rg.getCheckedRadioButtonId（）；rb=（单选按钮）findViewById（id）@它总是指向同一个单选按钮。

if (gender.equals("Male")){
  rb = (RadioButton)findViewById(R.id.resultGenderMale_update);
}
else if (gender.equals("Female"))
{
  rb = (RadioButton)findViewById(R.id.resultGenderFemale_update);
}

public class EditFriendActivity extends AppCompatActivity {
  private RadioGroup mGenderRadioGroup;
  private Button mUpdateButton;
  private EditText mNameField;
  private EditText mAddressField;
  private NumberPicker mAgePicker;
  private databaseManager4 mDatabaseManager;

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

    mDatabaseManager = new databaseManager4(this);
  }

  private void initUI() {
    Intent intent = getIntent();
    mNameField = (EditText) findViewById(R.id.fullName_update);
    mNameField.setText(intent.getStringExtra("name"));

    mAddressField = (EditText) findViewById(R.id.address_update);
    mAddressField.setText(intent.getStringExtra("address"));

    mAgePicker = (NumberPicker) findViewById(R.id.resultAge_update);
    mAgePicker.setMinValue(6);
    mAgePicker.setMaxValue(110);
    mAgePicker.setWrapSelectorWheel(false);
    mAgePicker.setValue(Integer.parseInt(intent.getStringExtra("age")));

    mUpdateButton = (Button) findViewById(R.id.update_button);
    mUpdateButton.setOnClickListener(updateClickListener);

    mGenderRadioGroup = (RadioGroup) findViewById(R.id.radioGroup_update);

    RadioButton targetRadioButton = null;
    switch (Gender.fromString(intent.getStringExtra("gender"))) {
      case MALE:
        targetRadioButton = (RadioButton) findViewById(R.id.resultGenderMale_update);
        break;
      case FEMALE:
        targetRadioButton = (RadioButton) findViewById(R.id.resultGenderFemale_update);
        break;
    }
    if (targetRadioButton != null) {
      targetRadioButton.setChecked(true);
    }
  }

  public void clear() {
    mNameField.setText("");
    mAddressField.setText("");
  }

  private Gender getSelectedGender() {
    int checkedButtonId = mGenderRadioGroup.getCheckedRadioButtonId();
    switch (checkedButtonId) {
      case R.id.resultGenderMale_update:
        return Gender.MALE;
      case R.id.resultGenderFemale_update:
        return Gender.FEMALE;
    }
    return Gender.UNDEFINED;
  }

  private View.OnClickListener updateClickListener =
      new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          Gender newGender = getSelectedGender();
          int code = Integer.parseInt(getIntent().getStringExtra("code"));
          System.out.println("gender is" + newGender.stringValue);
          if (mDatabaseManager.updateRow(
              code,
              mNameField.getText().toString(),
              mAgePicker.getValue(),
              newGender.stringValue,
              mAddressField.getText().toString())) {
            Toast.makeText(
                    getApplicationContext(),
                    "successfully updated the friend " + ed.getText().toString(),
                    Toast.LENGTH_SHORT)
                .show();
          } else {
            Toast.makeText(
                    getApplicationContext(),
                    "Could not  update the friend " + ed.getText().toString(),
                    Toast.LENGTH_SHORT)
                .show();
          }
          Intent viewFriendsIntent = new Intent(getApplicationContext(), viewFriends.class);
          startActivity(viewFriendsIntent);
          finish();
        }
      };

  private enum Gender {
    UNDEFINED("undefined"),
    MALE("Male"),
    FEMALE("Female");

    private @Nullable String stringValue;

    Gender(@Nullable String stringValue) {
      this.stringValue = stringValue;
    }

    public static Gender fromString(@Nullable String value) {
      if (value != null) {
        for (Gender gender : Gender.values()) {
          if (value.equals(gender.stringValue)) {
            return gender;
          }
        }
      }
      return UNDEFINED;
    }
  }
}