Question

我有6个编辑文本字段，我试图将它们输入到sqlite数据库中，并且我试图将其中的5个解析成双打，但它会抛出该错误而我无法弄清楚该怎么办。我曾尝试使用valueOf(String)并进行解析，但似乎都无法正常工作。

我也使用了Long和Integers，并且也遇到了同样的问题

以下是代码：

public class EditClass extends AppCompatActivity {

EditText name, exam, quiz, assignment, participation, lab;
String iName, sExam, sQuiz, sAss, sPart, sLab ;
double iExam, iQuiz, iLab, iAss, iPart;
FloatingActionButton fab;
Database database;


@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_edit_class);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    name = (EditText) findViewById(R.id.class_name);
    exam = (EditText) findViewById(R.id.exam_weight);
    quiz = (EditText) findViewById(R.id.quiz_weight);
    assignment = (EditText) findViewById(R.id.assignment_weight);
    participation = (EditText) findViewById(R.id.participation_weight);
    lab = (EditText) findViewById(R.id.lab_weight);

    iName = name.getText().toString();
    sExam = exam.getText().toString();
    sQuiz = quiz.getText().toString();
    sAss = assignment.getText().toString();
    sPart = participation.getText().toString();

    ImageView create = new ImageView(this);
    create.setImageDrawable(getResources().getDrawable(R.drawable.checkmark));

    fab = new FloatingActionButton.Builder(this).setContentView(create).build();
    fab.setBackground(getResources().getDrawable(R.drawable.button_action_lightblue_ztek));
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    addData();
}

public void addData(){
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {

                /**
                 * Errors with parsing into integer form, comes up with NumberFormatException
                 */
               database.insertData(iName,
                        iExam = Double.valueOf(sExam),
                        iQuiz = Double.valueOf(sQuiz),
                        iLab = Double.valueOf(sLab),
                        iAss = Double.valueOf(sAss),
                        iPart = Double.valueOf(sPart));

                        Toast.makeText(EditClass.this, "Data was Successfully Inserted", Toast.LENGTH_SHORT).show();

            }catch (Exception e){
               String error= e.toString();
                Toast.makeText(EditClass.this, "Data was Not Inserted", Toast.LENGTH_SHORT).show();
                System.out.println(error);

            }
        }
    });
}}

我现在最终将addData方法改为此，但现在它对于字符串和双精度都是null。

以下是方法：

public void addData(){
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                /**
                 * Errors with parsing into integer form, comes up with NumberFormatException
                 */
               database.insertData(name.getText().toString(),
                        Double.parseDouble(exam.getText().toString()),
                        Double.parseDouble(quiz.getText().toString()),
                        Double.parseDouble(lab.getText().toString()),
                        Double.parseDouble(assignment.getText().toString()),
                     Double.parseDouble(participation.getText().toString()));


                        Toast.makeText(EditClass.this, "Data was Successfully Inserted", Toast.LENGTH_SHORT).show();

            }catch (Exception e){
               String error= e.toString();
                Toast.makeText(EditClass.this, "Data was Not Inserted", Toast.LENGTH_SHORT).show();
                System.out.println(error);

            }



        }
    });
}

Answer 1

getText()只运行一次，目前是您调用iName的唯一地方。因此，sExam，FloatingActionButton等中的值都是您对这些字段的默认值，而不是点击iName = name.getText().toString();时的当前值。

相反，将OnClickListener等行移动到Double.valueOf()以获取当单击按钮时的当前值。

另请注意，您无法在空字段上使用NumberFormatException（这是您获得的$ContractorSamAccountNames = Import-Csv "C:\temp\stackoverflow.com_34245941\ContractorDomain.csv" | Select-Object -Property SamAccountName $i = 0 @(Import-Csv "C:\temp\stackoverflow.com_34245941\employeeList.csv" -Delimiter ",").ForEach({ if ($_.DomainNamesFromAD -eq "ContractorDomain") { $_ | Add-Member -MemberType "NoteProperty" -Name "SamAccountNameFromAD" -Value ($ContractorSamAccountNames[$i++].SamAccountName) -Force } $_ })) | Export-Csv -Path "C:\temp\stackoverflow.com_34245941\employeeList.csv" -Delimiter "," -Force -NoTypeInformation） - 请考虑将每个电话打包在TextUtils.isEmpty()中以检查是否有任何值一点都不。

java.lang.NumberFormatException：无效的double：＆＃34;＆＃34;编辑文字

1 个答案: