我想使用保存的首选项获取选定的单选按钮，但活动未打开？

Question

这是密码

public RadioButton selectedSex;
public int selectedRadioButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
    setContentView(R.layout.activity_personal_data);

    progressDialog = new ProgressDialog(this);

    // 0=FULL_NAME
    // 1 =BIRTHDAY
    //2=ADDRESS_LINE
    // 3=CITY
    //4=STATE
    // 5=PINCODE
    // 6=PHONE
    mUserPersonalInfo[0] = findViewById(R.id.user_name);
    mUserPersonalInfo[1]=findViewById(R.id.user_birth_date);
    mUserPersonalInfo[2]=findViewById(R.id.user_address_line);
    mUserPersonalInfo[3]=findViewById(R.id.user_city);
    mUserPersonalInfo[4]=findViewById(R.id.user_state);
    mUserPersonalInfo[5] = findViewById(R.id.userPhoneNumber);
    mUserPersonalInfo[6] = findViewById(R.id.user_pincode);
    mAuth = FirebaseAuth.getInstance();
    mSex=findViewById(R.id.user_sex);
    mNext = findViewById(R.id.personal_details_next_button);
    sharedpreferences = getSharedPreferences("personalPref", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedpreferences.edit();

    selectedRadioButton  = mSex.getCheckedRadioButtonId();
    selectedSex  = findViewById(selectedRadioButton);

    mUserPersonalInfo[1].setText( sharedpreferences.getString("userDOB", null));
    mUserPersonalInfo[0].setText(sharedpreferences.getString("userName", null));
    mUserPersonalInfo[2].setText(sharedpreferences.getString("userAddressline", null));
    mUserPersonalInfo[3].setText(sharedpreferences.getString("userCity", null));
    mUserPersonalInfo[4].setText( sharedpreferences.getString("userState", null));
    mUserPersonalInfo[5].setText( sharedpreferences.getString("userPhone", null));
    mUserPersonalInfo[6].setText(sharedpreferences.getString("userPincode", null));
    selectedSex.setSelected( sharedpreferences.getBoolean("userSex", false));
  //  mNext.setProgress(0);

   // FirebaseDatabase.getInstance().setPersistenceEnabled(true);
    mNext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        //    mNext.setProgress(1);

            final String Birthday = mUserPersonalInfo[1].getText().toString();
            UserName = mUserPersonalInfo[0].getText().toString();
            final String Addressline = mUserPersonalInfo[2].getText().toString();
            final String City = mUserPersonalInfo[3].getText().toString();
            final String State = mUserPersonalInfo[4].getText().toString();
           PhoneNumber = mUserPersonalInfo[5].getText().toString();
            final String Pincode = mUserPersonalInfo[6].getText().toString();


   editor.putString("userName", UserName);
            editor.putString("userPhone", PhoneNumber);
            editor.putString("userDOB", Birthday);
            editor.putBoolean("userSex", selectedSex.isChecked());
            editor.putString("userAddressline", Addressline);
            editor.putString("userCity", City);
            editor.putString("userPincode", Pincode);
            editor.putString("userState", State);

            editor.apply();

进程：com.teepe.teepe，PID： 18864java.lang.RuntimeExcture：无法启动活动ComponentInfo{com.teepe.teepe/com.teepe.teepe.KYC.personalData}：java.lang.NullPointerExcture：尝试调用虚拟方法'空android.widget.RadioButton.setS选（布尔值）'在一个空对象引用android.app.ActivityThread.perform启动活动（ActivityThread.java:2646）在android.app.ActivityThread.handle启动活动（ActivityThread.java:2707）android.app.ActivityThread-wrap12（ActivityThread.java）在android.app.ActivityThread$H. handleMessage（ActivityThread.java:1460）android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Loop. cle（Loop. java： 154）在android. app。ActivityThread. main（ActivityThread. java： 6077）在java. lang.反射。方法调用（本机方法）在com. android. interal. os。ZygoteInit$method odAndArgsCaller. run（ZygoteInit. java： 866）在com. android. interal. os。ZygoteInit. main（ZygoteInit. java： 756）引起：java. lang.空指针异常：尝试调用虚拟方法的空android. widget。在com. teepe. teepe的空对象引用上选择（布尔值）。在android. app.Activity. java： 6662

Answer 1

在这是找不到的看法

RadioButton selectedsex=findViewById（selectedRadioButton）；

必须像：

RadioButton selectedSex=findViewById（R.id.selectedRadioButton）

Answer 2

似乎mSex。getCheckedRadioButtonId（）未返回正确的Id。

因此，findViewById（selectedRadioButton）无法找到该视图。因此，setSelected方法调用中出现NullPointerException。