Question

我正在使用这种方法从日历中读取日期并将其显示在TextView上，但它只显示25：10：2015，当我选择其他日期时它不会改变。我写了一个事件来改变日期，但我不知道出了什么问题： package com.example.user.calendar;

import android.app.DatePickerDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final TextView datee=(TextView)findViewById(R.id.textView2);
        final Calendar c=Calendar.getInstance();
        final int year =c.get(Calendar.YEAR);
        final int month =c.get(Calendar.MONTH);
        final int day =c.get(Calendar.DAY_OF_MONTH);
        datee.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DatePickerDialog datepicker = new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                        datee.setText(" ");
                        datee.setText(year + ":" + month + ":" + day);
                       // dayyy=datee.getText().toString();
                    }


                }, year, month, day);
                datepicker.setTitle("select date");
                datepicker.show();

            }
        });


    }

Answer 1

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private ImageButton ib;
    private Calendar cal;
    private int day;
    private int month;
    private int year;
    private EditText et;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ib = (ImageButton) findViewById(R.id.imageButton1);
        cal = Calendar.getInstance();
        day = cal.get(Calendar.DAY_OF_MONTH);
        month = cal.get(Calendar.MONTH);
        year = cal.get(Calendar.YEAR);
        et = (EditText) findViewById(R.id.editText);
        ib.setOnClickListener((View.OnClickListener) this);
    }
@Override
    public void onClick(View v) {
        showDialog(0);
    }
    @Override
    @Deprecated
    protected Dialog onCreateDialog(int id) {
        return new DatePickerDialog(this, datePickerListener, year, month, day);
    }

    private DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() {
        public void onDateSet(DatePicker view, int selectedYear,
                              int selectedMonth, int selectedDay) {
            et.setText(selectedDay + " / " + (selectedMonth + 1) + " / "
                    + selectedYear);
        }
    };
}

Answer 2

尝试这个我希望它的工作。

   private DatePickerDialog.OnDateSetListener datePickerListener 
            = new DatePickerDialog.OnDateSetListener() {

    // when dialog box is closed, below method will be called.
    public void onDateSet(DatePicker view, int selectedYear,
            int selectedMonth, int selectedDay) {
        year = selectedYear;
        month = selectedMonth;
        day = selectedDay;

        // set selected date into textview
        tvDisplayDate.setText(new StringBuilder().append(month + 1)
           .append("-").append(day).append("-").append(year)
           .append(" "));

        // set selected date into datepicker also
        dpResult.init(year, month, day, null);

    }
};

Answer 3

当你'setText'时，你正在使用'Calendar.getInstance（）;'中的变量。根据当前日，月和年设置这些变量。相反，您应该使用由datePicker设置的变量。

而不是：

datee.setText(year + ":" + month + ":" + day);

使用它：

datee.setText(year + ":" + monthOfYear + ":" + dayOfMonth);

此外，Calendar.Month返回的月份是一个（10而不是11），因为Java日历从0到11。因此，您必须在月份中添加1才能获得当前月份的正确数字。但默认情况下，datePicker返回的月份值（dayOfMonth）应该是正确的。

阅读日历日期

3 个答案: