android日期区间选择器

Android提供了DatePicker和CalendarView两个控件，可以用于日期选择，但是它们都只能选择单个日期，无法选择日期区间。如果需要实现日期区间选择器，可以使用第三方库或自定义控件来实现。

以下是一个简单的自定义控件实现日期区间选择器的示例代码：

public class DateRangePicker extends LinearLayout {

    private TextView mStartDateTextView;
    private TextView mEndDateTextView;
    private DatePickerDialog mStartDatePickerDialog;
    private DatePickerDialog mEndDatePickerDialog;

    public DateRangePicker(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        LayoutInflater inflater = LayoutInflater.from(getContext());
        View view = inflater.inflate(R.layout.date_range_picker, this, true);

        mStartDateTextView = view.findViewById(R.id.start_date_text_view);
        mEndDateTextView = view.findViewById(R.id.end_date_text_view);

        mStartDateTextView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                showStartDatePickerDialog();
            }
        });

        mEndDateTextView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                showEndDatePickerDialog();
            }
        });
    }

    private void showStartDatePickerDialog() {
        if (mStartDatePickerDialog == null) {
            mStartDatePickerDialog = new DatePickerDialog(getContext(), new DatePickerDialog.OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    Calendar calendar = Calendar.getInstance();
                    calendar.set(year, monthOfYear, dayOfMonth);
                    mStartDateTextView.setText(getFormattedDate(calendar.getTime()));
                }
            }, Calendar.getInstance().get(Calendar.YEAR), Calendar.getInstance().get(Calendar.MONTH), Calendar.getInstance().get(Calendar.DAY_OF_MONTH));
        }
        mStartDatePickerDialog.show();
    }

    private void showEndDatePickerDialog() {
        if (mEndDatePickerDialog == null) {
            mEndDatePickerDialog = new DatePickerDialog(getContext(), new DatePickerDialog.OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    Calendar calendar = Calendar.getInstance();
                    calendar.set(year, monthOfYear, dayOfMonth);
                    mEndDateTextView.setText(getFormattedDate(calendar.getTime()));
                }
            }, Calendar.getInstance().get(Calendar.YEAR), Calendar.getInstance().get(Calendar.MONTH), Calendar.getInstance().get(Calendar.DAY_OF_MONTH));
        }
        mEndDatePickerDialog.show();
    }

    private String getFormattedDate(Date date) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
        return sdf.format(date);
    }

    public String getStartDate() {
        return mStartDateTextView.getText().toString();
    }

    public String getEndDate() {
        return mEndDateTextView.getText().toString();
    }

}

在布局文件中可以使用该自定义控件：

<com.example.daterangepicker.DateRangePicker
    android:id="@+id/date_range_picker"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

在代码中可以使用以下方法获取选择的日期区间：

DateRangePicker dateRangePicker = findViewById(R.id.date_range_picker);
String startDate = dateRangePicker.getStartDate();
String endDate = dateRangePicker.getEndDate();