java - 想要在日期选择器上选择上一个日期。 (安卓)

Question

我在自定义对话框中有一个日期选择器和一个时间选择器。如果我更改日期选择器上的日期，它会在 Textview 上更新。但是当我再次选择日期选择器时，它给出了今天的日期。我希望之前选择的日期显示在日期选择器上。这是我的代码。请帮忙!!

from.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            picker = new Dialog(getActivity());
            picker.setContentView(R.layout.datetime);
            picker.setTitle("Select Date and Time");
            datep = (DatePicker) picker.findViewById(R.id.datePicker);
            timep = (TimePicker) picker.findViewById(R.id.timePicker1);

            set = (Button) picker.findViewById(R.id.btnSet);
            set.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    // TODO Auto-generated method stub
                    month = datep.getMonth() + 1;
                    day = datep.getDayOfMonth();
                    year = datep.getYear();
                    hour = timep.getCurrentHour();
                    minute = timep.getCurrentMinute();
                    from.setText(year + "-" + month + "-" + day + " "
                            + hour + ":" + minute);
                    picker.dismiss();



                }
            });
            picker.show();
        }
    });    

Answer 1

找到了答案。只需将其设置在显示按钮的按钮范围之外...

    picker = new Dialog(getActivity());
    picker.setContentView(R.layout.datetime);
    picker.setTitle("Select Date and Time");
    datep = (DatePicker) picker.findViewById(R.id.datePicker);
    timep = (TimePicker) picker.findViewById(R.id.timePicker1);


from.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            set = (Button) picker.findViewById(R.id.btnSet);
            set.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    // TODO Auto-generated method stub


                    //datep.updateDate(year, month, day);

                    month = datep.getMonth() + 1;
                    day = datep.getDayOfMonth();
                    year = datep.getYear();
                    hour = timep.getCurrentHour();
                    minute = timep.getCurrentMinute();
                    from.setText(year + "-" + month + "-" + day + " "
                            + hour + ":" + minute);
                    picker.dismiss();



                }
            });
            picker.show();
        }
    });