Question

这是代码

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：18864 java.lang.RuntimeException：无法启动活动ComponentInfo {com.teepe.teepe / com.teepe.teepe.KYC.personalData}：java.lang.NullPointerException：尝试调用虚拟方法'void android.widget.RadioButton.setSelected（ boolean）'引用空对象在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2646）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2707）在android.app.ActivityThread.-wrap12（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1460）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:154）在android.app.ActivityThread.main（ActivityThread.java:6077）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:866）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:756）原因：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'void android.widget.RadioButton.setSelected（boolean）' 在com.teepe.teepe.KYC.personalData.onCreate（personalData.java:92）在android.app.Activity.performCreate（Activity.java:6662）

Answer 1

似乎mSex.getCheckedRadioButtonId()没有返回正确的ID。

由于此findViewById(selectedRadioButton)无法找到视图。因此，在setSelected方法调用中为NullPointerException。

Answer 2

在此找不到视图

RadioButton selectedSex = findViewById(selectedRadioButton);

必须像：

RadioButton selectedSex = findViewById(R.id.selectedRadioButton);

我想使用保存的偏好设置来获取选定的单选按钮，但活动未打开？

2 个答案: