Question

我试图从radiogroup获取radiobutton文本，但问题是：它没有得到值。我在其他链接上搜索但对我没有帮助。

    private EditText FirstName;
    private EditText LastName;
   private RadioGroup Gender;
    private EditText MobileNo;
  private RadioButton btn_gender;
    private Button BtnNext;
    private ProgressBar  progressBar;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.registration_form);
        Firebase.setAndroidContext(this);
        FirstName=(EditText)findViewById(R.id.firstname);
        LastName=(EditText)findViewById(R.id.lastname);
        Gender=(RadioGroup) findViewById(R.id.radio_group);

        MobileNo=(EditText)findViewById(R.id.btn_mobile);
        BtnNext=(Button)findViewById(R.id.btn_regform);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);


  int selectedId=Gender.getCheckedRadioButtonId();
        btn_gender=(RadioButton)findViewById(selectedId);



        BtnNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                progressBar.setVisibility(View.VISIBLE);
                Firebase ref=new Firebase(config_firebaseurl.FIREBASE_URL);


                String fname=FirstName.getText().toString().trim();
                String lname=LastName.getText().toString().trim();
               String gender=btn_gender.getText().toString().trim();
                String phoneno=BtnNext.getText().toString().trim();

                registration_form reg=new registration_form();
                reg.setFirstName(fname);
                reg.setLastName(lname);
                reg.setGender(gender);
                reg.setmobileNo(phoneno);

                ref.child("registration_form").setValue(reg);
                Toast.makeText(getApplicationContext(),"Registration Error", Toast.LENGTH_LONG).show();
                progressBar.setVisibility(View.GONE);
            }
        });



    }
}

我收到了这个错误：

致命的例外：主要进程：associate.aclass.associate1，PID：28847 java.lang.NullPointerException：尝试调用虚方法 'java.lang.CharSequence android.widget.RadioButton.getText（）'上一个 null对象引用在 associate.aclass.associate1.registration_form_handler $ 2.onClick（registration_form_handler.java:81）在android.view.View.performClick（View.java:4856）在android.view.View $ PerformClick.run（View.java:19956）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:211）在android.app.ActivityThread.main（ActivityThread.java:5389） at java.lang.reflect.Method.invoke（Native Method）在java.lang.reflect.Method.invoke（Method.java:372）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1020）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:815）

Answer 1

btn_gender为null您需要在Gender.setOnCheckedChangeListener之外执行此操作以初始化btn_gender

btn_gender = (RadioButton)findViewById(R.id.radioButtonID); // use your id

RadioGroup问题

1 个答案: