Question

我在Android中使用PagerDatePicker库来选择日期，并在相应日期的片段上做一些工作。但我遇到的问题是，当我点击某个日期时，我会在相应日期的文本视图中获得正确的日期，但在Toast或Logcat上却没有。当我在屏幕上滑动时（因为它是一个viewpager，我可以滑动以移动到显示here所示的下一个日期），或点击任何日期，我在textView上获得正确的日期，但是在Logcat上或Toast，它显示所选日期之后一天或之前一天的日期如何在textView上显示正确的文本，在Toast / Logcat上显示错误的字符串。

有3个Java文件 - MainActivity.java -

import android.os.Bundle;  
import android.support.v7.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.fl_main_container, DatePickerDefaultFragment.newInstance())
                .commit();
    }

}

DatePickerDefaultFragment.java -

import android.os.Bundle;  
import android.support.annotation.Nullable;  
import android.support.v4.app.Fragment;  
import android.support.v4.view.ViewPager;  
import android.util.Log;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.Toast;  

import org.joda.time.DateTime;  
import org.joda.time.LocalDate;  
import org.joda.time.format.DateTimeFormat;  
import org.joda.time.format.DateTimeFormatter;  

import java.text.ParseException;  
import java.text.SimpleDateFormat;  
import java.util.Date;  

import pl.rspective.pagerdatepicker.PagerDatePickerDateFormat;  
import pl.rspective.pagerdatepicker.adapter.DatePagerFragmentAdapter;  
import pl.rspective.pagerdatepicker.adapter.DefaultDateAdapter;  
import pl.rspective.pagerdatepicker.model.DateItem;  
import pl.rspective.pagerdatepicker.view.DateRecyclerView;  
import pl.rspective.pagerdatepicker.view.RecyclerViewInsetDecoration;  

public class DatePickerDefaultFragment extends Fragment {

    private DateRecyclerView dateList;
    private ViewPager pager;
    LocalDate localDate;
    DateTime dateTime;

    public static DatePickerDefaultFragment newInstance() {
        return new DatePickerDefaultFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_picker_default, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        pager = (ViewPager) view.findViewById(R.id.pager);
        dateList = (DateRecyclerView) view.findViewById(R.id.date_list);

        // [Setting today's date in the DatePicker.]
        localDate = new LocalDate();
        DateTimeFormatter fmt = DateTimeFormat.forPattern("dd-MM-yyyy");
        Log.i(getClass().getName(), localDate.toString(fmt));
        String DATE_START = localDate.toString(fmt);
        String DATE_END = localDate.plusYears(5).toString(fmt);
        Log.i(getClass().getName(), DATE_END);
        // [END]

        dateList.addItemDecoration(new RecyclerViewInsetDecoration(getActivity(), R.dimen.date_card_insets));

        Date start = null;
        Date end = null;
        Date defaultDate = null;

        try {
            start = PagerDatePickerDateFormat.DATE_PICKER_DD_MM_YYYY_FORMAT.parse(DATE_START);
            end = PagerDatePickerDateFormat.DATE_PICKER_DD_MM_YYYY_FORMAT.parse(DATE_END);

            defaultDate = PagerDatePickerDateFormat.DATE_PICKER_DD_MM_YYYY_FORMAT.parse(DATE_START );

        } catch (ParseException e) {
            e.printStackTrace();
        }

        dateList.setAdapter(new DefaultDateAdapter(start, end, defaultDate));

        DatePagerFragmentAdapter fragmentAdapter = new DatePagerFragmentAdapter(getFragmentManager(), dateList.getDateAdapter()) {
            @Override
            protected Fragment getFragment(int position, long date) {
                return SimplePageFragment.newInstance(position, date);
            }
        };

        pager.setAdapter(fragmentAdapter);
        dateList.setPager(pager);

        dateList.setDatePickerListener(new DateRecyclerView.DatePickerListener() {
            @Override
            public void onDatePickerItemClick(DateItem dateItem, int position) {
//                Toast.makeText(getActivity(), "Clicked: " + position, Toast.LENGTH_SHORT).show();
                SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy");
                Toast.makeText(getActivity(), "Date - " + simpleDateFormat.format(dateItem.getDate()), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onDatePickerPageSelected(int position) {
            }

            @Override
            public void onDatePickerPageStateChanged(int state) {
            }

            @Override
            public void onDatePickerPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }
        });

    }
}

和SimplePageFragment.java -

import android.os.Bundle;  
import android.support.annotation.Nullable;  
import android.support.v4.app.Fragment;  
import android.util.Log;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.TextView;  

import org.joda.time.DateTime;  
import org.joda.time.format.DateTimeFormat;  
import org.joda.time.format.DateTimeFormatter;  

import java.text.SimpleDateFormat;  

public class SimplePageFragment extends Fragment {

    private static final SimpleDateFormat SIMPLE_DATE_FORMAT = new SimpleDateFormat("dd-MM-yyyy");
    private static final String DATE_PICKER_DATE_KEY = "date_picker_date_key";
    private static final String DATE_PICKER_POSITION_KEY = "date_picker_position_key";
    private final String TAG = getClass().getSimpleName();

    private TextView tvDate;
    private TextView tvPosition;

    private int position;
    private long date;
    private DateTime dateTime;

    public static SimplePageFragment newInstance(int position, long date) {
        Bundle bundle = new Bundle();
        bundle.putInt(DATE_PICKER_POSITION_KEY, position);
        bundle.putLong(DATE_PICKER_DATE_KEY, date);

        SimplePageFragment simplePageFragment = new SimplePageFragment();
        simplePageFragment.setArguments(bundle);

        return simplePageFragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        position = getArguments().getInt(DATE_PICKER_POSITION_KEY, -1);
        date = getArguments().getLong(DATE_PICKER_DATE_KEY, -1);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_simple, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        tvDate = (TextView) view.findViewById(R.id.tv_date_label);
        tvPosition = (TextView) view.findViewById(R.id.tv_position_label);

        dateTime = new DateTime(date);
        DateTimeFormatter formatter = DateTimeFormat.forPattern("dd-MM-yyyy");
        Log.i(TAG, dateTime.toString(formatter));
//        tvDate.setText("fun");
        String ss = dateTime.toString(formatter);
        tvDate.setText(ss);
//        Log.e("DATE", "" + dateTime.toString(formatter));

        Log.e("DATE2", ss);
//        Toast.makeText(getActivity(), SIMPLE_DATE_FORMAT.format(date), Toast.LENGTH_SHORT).show();
//        tvPosition.setText(String.valueOf(position));
    }

}

并且在SimplePageFragment中使用了这个fragment_page_simple.xml布局 -

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ff343434"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_date_label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:textSize="20sp"
        android:textColor="#0f0"/>

    <TextView
        android:id="@+id/tv_position_label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:gravity="center_horizontal"
        android:textSize="16sp"
        android:textColor="#ffff3f49"/>

</LinearLayout>

Answer 1

这只是一个快速拍摄，但你尝试使用标准的Java Date类。该库基于它们，您正在使用JodaTime库。这不应该有任何区别，但谁知道。你在textView中有正确的值而在logcat中有错误，这真的很奇怪。

我检查了演示应用程序，我在logcat / toast中获得了正确的值 - 我使用了标准的Java日期类。

Answer 2

final SimpleDateFormat SIMPLE_DATE_FORMAT = new SimpleDateFormat（＆＃34; yyyy-MM-dd＆＃34;）;

    dateList = (DateRecyclerView) view.findViewById(R.id.date_list);
    dateList.setDatePickerListener(new DateRecyclerView.DatePickerListener() {

        @Override
        public void onDatePickerItemClick(DateItem dateItem, int position) {
            Toast.makeText(context, "date = " + SIMPLE_DATE_FORMAT.format(dateItem.getDate()), Toast.LENGTH_LONG).show();
            someTextView.setText(SIMPLE_DATE_FORMAT.format(dateItem.getDate()));
        }

        @Override
        public void onDatePickerPageSelected(int position) {

        }

        @Override
        public void onDatePickerPageStateChanged(int state) {

        }

        @Override
        public void onDatePickerPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }
    });

从Android PagerDatePicker库中获取正确的日期字符串

2 个答案: