android - 日期选择器 Android Lollipop 中未调用 OnDateChanged

Question

我有自定义日期选择器和时间选择器。它在 api 级别 21 之前工作正常，但在它不工作之后。我调试了代码，发现更改日期时不会调用 ondatechanged 和 ontimechanged。

那么如何解决这个问题。

DatePicker 的自定义类是 -

public class DatePickerDialog extends Dialog implements OnDateChangedListener,OnClickListener{

    private static DatePickerDialog dialog;
    private String date;
    private String title;
    private DatePickerCallback callback;
    private DatePicker datePicker;
    private TextView tvHeading;
    private Button btnDone;
    private String lastModifiedDate;
    private String initialDate;
    private boolean isStartDateToday;
    private long currentDateInMS = 0;
    private Context context;
    private int noOfDaysBefore = 0;

    public DatePickerDialog(Context context, DatePickerCallback callback, String date, String title, boolean isStartDateToday,int noOfDaysBefore) {
        super(context);
        this.context = context;
        this.callback = callback;
        this.date = date;
        this.lastModifiedDate = date;
        this.initialDate = date;
        this.title = title;
        this.isStartDateToday = isStartDateToday;
        this.noOfDaysBefore = noOfDaysBefore;
    }

    public interface DatePickerCallback {
        public void setDate(String date);
    }

    public static void showDatePickerDialog(Context context,DatePickerCallback callback,String date,String title,int numOfDaysBefore){
        dialog = new DatePickerDialog(context, callback, date,title,false,numOfDaysBefore);
        dialog.show();
    }

    public static void showDatePickerDialogStartDateToday(Context context,DatePickerCallback callback,String date,String title){
        dialog = new DatePickerDialog(context, callback, date,title,true,0);
        dialog.show();
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.layout_datepicker);
         getWindow().getAttributes().windowAnimations = R.style.animationdialog;
        findAllIds();

        setListener();
        init(date);
    }

    private void findAllIds(){
        tvHeading = (TextView)findViewById(R.id.tv_heading);
        datePicker = (DatePicker)findViewById(R.id.datePicker);
        btnDone = (Button)findViewById(R.id.btn_done);
        tvHeading.setText(title);
    }

    private void setListener(){
        btnDone.setOnClickListener(this);
    }

    private long getMilisecondsFromCalendar(int noOfDays){
        SimpleDateFormat sdf = new SimpleDateFormat("ddMMyyyy HH:mm:ss");
        String previousDate = CommonFunction.getDateBeforeOrAfterNoOfDays(
                CommonFunction.getCurrentDate("ddMMyyyy HH:mm:ss"), noOfDaysBefore, "ddMMyyyy HH:mm:ss");
        Date date;
        Calendar calendar = Calendar.getInstance();
        try {
            date = sdf.parse(previousDate);
            calendar.setTime(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        return calendar.getTimeInMillis();
    }

    private void init(String date){
        String date_str = CommonFunction.formatDate("yyyyMMdd", "dd MM yyyy", date);
        String datearr[] = date_str.split(" ");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Integer.parseInt(datearr[2]), Integer.parseInt(datearr[1]), Integer.parseInt(datearr[0])); 
        int iDay=calendar.get(Calendar.DATE);
        int iMonth=calendar.get(Calendar.MONTH); 
        int iYear=calendar.get(Calendar.YEAR);
        if(isStartDateToday){
            datePicker.setMinDate(System.currentTimeMillis()-1000);
        }else{
            if(currentDateInMS == 0){

                currentDateInMS = getMilisecondsFromCalendar(1);//Calendar.getInstance().getTimeInMillis();
            }
            datePicker.setMaxDate(currentDateInMS);
        }
        datePicker.init(iYear, iMonth-1, iDay, this);
        datePicker.setDescendantFocusability(DatePicker.FOCUS_BLOCK_DESCENDANTS);
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {
        StringBuilder date = new StringBuilder();
        date.append(year);
        monthOfYear = monthOfYear +1;
        if(monthOfYear < 10){
            date.append("0"+monthOfYear+dayOfMonth);
        }else{
            date.append(monthOfYear).append(dayOfMonth);
        }
        if(isStartDateToday){

        }else{
            if(!isDateValid(date.toString())){
                try{
                    init(lastModifiedDate);
                }catch(Exception e){
                    e.printStackTrace();
                }
                return;
            }
        }
        this.date = date.toString();
    }

    private boolean isDateValid(String date){
        boolean flag = false;
        String currentDate = CommonFunction.getCurrentDate("yyyyMMdd");
        long days = CommonFunction.getNoOfDaysBetweenDate(currentDate, date, "yyyyMMdd");
      //  long days = CommonFunction.getNoOfDaysBetweendate(CommonFunction.formatDate("dd-MMM-yyyy", "ddMMyyyy", ), CommonFunction.formatDate("yyyyMMdd", "ddMMyyyy", date));
        if(days <= 0){
           flag = true; 
           lastModifiedDate = date;
        }
        return flag;
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
        case R.id.btn_done:
            callback.setDate(this.date);
            dialog.dismiss();
            break;
        }
    }
}

布局文件是

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#88000000"
     >

    <TextView
        android:id="@+id/tv_heading"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:background="@drawable/topcornerblue"
        android:padding="@dimen/datePickerHeadingTextPadding"
        android:text="@string/selectDate"
        android:textColor="@color/white"
        android:textSize="@dimen/datePickerHeadingTextSize" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/whitebottomcorner"
        android:paddingBottom="@dimen/datePickerButtonMargin"
        android:layout_below="@+id/tv_heading" >

        <DatePicker
            android:id="@+id/datePicker"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_margin="@dimen/datePickerMarginTop" />


        <Button
            android:id="@+id/btn_done"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/datePicker"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="@dimen/datePickerMarginTop"
            android:background="#14768D"
            android:padding="@dimen/datePickerHeadingTextPadding"
            android:text="@string/done"
            android:textColor="@color/white"
            android:minWidth="@dimen/datePickerButtonMinWidth"
            android:minHeight="@dimen/datePickerButtonMinHeight"
            android:textSize="@dimen/datePickerButtonTextSize"
            android:visibility="visible" />
    </RelativeLayout>

</RelativeLayout>

Answer 1

这是 Android 5.0 及更高版本中的一个错误，当日期选择器处于其新的 Material 样式日历模式时会发生。您可以通过在日期选择器上设置 android:datePickerMode="spinner" 强制日期选择器使用 5.0 之前的微调器模式来解决此错误。

或者您可以使用 DatePickerDialog反而。对话框监听器的 onDateChanged 方法会被调用，即使对话框处于新 Material 日历模式也是如此。