如何使用 DatePicker 和 TimePicker (Android Studio) 在数据库中存储日期和时间？

Posted 2023-05-07

【中文标题】如何使用 DatePicker 和 TimePicker (Android Studio) 在数据库中存储日期和时间？

【英文标题】：How to store date and time in the database using DatePicker and TimePicker (Android Studio)?

【发布时间】：2019-02-27 23:08:34

【问题描述】：

我正在尝试构建一个应用程序，用户可以在其中选择日期和时间（通过 DatePicker 和 TimePicker），然后按下一个名为“添加考试”的按钮，该按钮将这些信息存储到 SQLite 数据库中。当用户点击“查看考试”时，日期和时间应该与存储在数据库中的其他信息一起显示在屏幕上。

我收到“date.getText().toString(), time1.getText().toString()”行错误，其中“getText”未被识别。

 public class Exam extends AppCompatActivity 

DatabaseManager myDb;
EditText un, loc3;
DatePicker date;
TimePicker time1;

int year;
int monthOfYear;
int dayOfMonth;

Button btnAddExam;
Button btnViewExam;
Button btnDeleteExam;

 @Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main5);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setTitle(null);
    myDb = new DatabaseManager(this);

    un = (EditText)findViewById(R.id.un);
    date = (DatePicker)findViewById(R.id.date);
    loc3 = (EditText)findViewById(R.id.loc3);
    time1 = (TimePicker) findViewById(R.id.time1);
    btnAddExam = (Button)findViewById(R.id.addexam);
    btnViewExam = (Button)findViewById(R.id.viewexam);
    btnDeleteExam = (Button)findViewById(R.id.deleteexam);

    AddExam();
    ViewExam();
    DeleteExam();




public  void AddExam() 
    btnAddExam.setOnClickListener(
            new View.OnClickListener() 
                @RequiresApi(api = Build.VERSION_CODES.O)
                @Override
                public void onClick(View v) 
                    boolean isInserted = myDb.insertDataExam(
                            un.getText().toString(),
                            loc3.getText().toString(),
                            date.getText().toString(),
                            time1.getText().toString()
                    );


                    if(isInserted == true)
                        Toast.makeText(Exam.this,"Data Inserted",Toast.LENGTH_LONG).show();
                    else
                        Toast.makeText(Exam.this,"Data not Inserted",Toast.LENGTH_LONG).show();
                
            
    );



public  void ViewExam() 
    btnViewExam.setOnClickListener(
            new View.OnClickListener() 
                @Override
                public void onClick(View v) 


                    Cursor res = myDb.getAllDataExam();
                    if(res.getCount() == 0) 

                        message("Error","Nothing found");
                        return;
                    

                    StringBuffer buffer = new StringBuffer();

                    while (res.moveToNext()) 
                        buffer.append("Unit Name: "+ res.getString(0)+"\n\n");
                        buffer.append("Date: "+ res.getString(1)+"\n");
                        buffer.append("Time: "+ res.getString(2)+"\n");
                        buffer.append("Location: "+ res.getString(3)+"\n\n");

                    

                    // Show all data
                    message("Exam Information",buffer.toString());


                
            
    );


public void DeleteExam() 
    btnDeleteExam.setOnClickListener(
            new View.OnClickListener() 
                @Override
                public void onClick(View v) 

                
            
    );




public void message(String title,String Message)
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(Message);
    builder.show();



@Override
public boolean onCreateOptionsMenu(Menu menu) 
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.screen5_menu, menu);
    return true;


@Override
public boolean onOptionsItemSelected(MenuItem item) 
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in androidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement

    if (id == R.id.home5) 

        Intent intent = new Intent(Exam.this, Home.class);
        startActivity(intent);
        return true;
    



    return super.onOptionsItemSelected(item);


    

【问题讨论】：

您不能直接从 datePicker 获取日期。你必须实现onDateSet() 方法。它将返回您可以使用的日期字符串

【参考方案1】：

您必须单独获取部分日期

int day = datePicker.getDayOfMonth();
int month = datePicker.getMonth();
int year =  datePicker.getYear();

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