Question

我在一项活动中有2个日期选择器。我想要做的是当用户尝试从第二个日期选择器中选择日期时，那个日期应该大于第一个日期选择器的日期，否则它应该显示警告对话框。

以下是我的代码。

public class Assignment_Create extends Activity implements OnClickListener {

DataManipulator dataManipulator;
static final int DIALOG_ID = 1;

ImageView imageViewDateAssign, imageViewDueDate, imageViewSubmit;
TextView textViewDtAssign, textViewDueDt;
EditText editTextTitle, editTextDesc;

static final int DATE_DIALOG_ID = 0;
int cDay, cMonth, cYear;

private TextView activeDateDisplay;
private Calendar activeDate;

// Update database
String updateId;
public boolean isEdit;

@Override
public void onCreate(Bundle savedInstanceState) {
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.assignment_create);

    imageViewDateAssign = (ImageView) findViewById(R.id.dateassign);
    imageViewDueDate = (ImageView) findViewById(R.id.duedate);
    imageViewSubmit = (ImageView) findViewById(R.id.submit);

    textViewDtAssign = (TextView) findViewById(R.id.textViewDateAssign);
    textViewDueDt = (TextView) findViewById(R.id.textViewDueDate);

    editTextTitle = (EditText) findViewById(R.id.title);
    editTextDesc = (EditText) findViewById(R.id.description);

    isEdit = getIntent().getExtras().getBoolean("isEdit");
    updateId = getIntent().getExtras().getString("idNo");

    if (isEdit) {
        editTextTitle.setText(getIntent().getExtras().getString(
                "AsmntTitle"));
        editTextDesc
                .setText(getIntent().getExtras().getString("AsmntDesc"));
    }

    Code.AssignDate = Calendar.getInstance();
    Code.DueDate = Calendar.getInstance();

    imageViewDateAssign.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
            showDateDialog(textViewDtAssign, Code.AssignDate);
        }
    });

    imageViewDueDate.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
            showDateDialog(textViewDueDt, Code.DueDate);
        }
    });

    imageViewSubmit.setOnClickListener(this);

    updateDisplay(textViewDtAssign, Code.AssignDate);
    updateDisplay(textViewDueDt, Code.DueDate);
}

public void onClick(View v) {
    switch (v.getId()) {
    case R.id.submit:

        Code.title = editTextTitle.getText().toString().trim();
        Code.description = editTextDesc.getText().toString().trim();
        Code.diff = Code.DueDate.getTimeInMillis()
                - Code.AssignDate.getTimeInMillis();
        Code.days = Code.diff / (24 * 60 * 60 * 1000);
        Code.strDays = String.valueOf(Code.days);

        Date assignDate = new Date(Code.AssignDate.getTimeInMillis());
        Date dueDate = new Date(Code.DueDate.getTimeInMillis());

        if (dueDate.before(assignDate) || dueDate.equals(assignDate)) {
            AlertDialog.Builder myDialogBattery = new AlertDialog.Builder(
                    Assignment_Create.this);
            myDialogBattery.setTitle("How to use Less Battery");
            myDialogBattery.setMessage("hahahahahaha");
            myDialogBattery.setPositiveButton("OK",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface arg0, int arg1) {
                        }
                    });
            myDialogBattery.show();
        }

        if (isEdit) {
            this.dataManipulator = new DataManipulator(this);
            this.dataManipulator.update(updateId);
            this.dataManipulator.close();
        } else {
            this.dataManipulator = new DataManipulator(this);
            this.dataManipulator.insert(Code.title, Code.description,
                    Code.strDays);
            this.dataManipulator.close();
        }

        Toast.makeText(getApplicationContext(),
                "Details are saved successfully", Toast.LENGTH_LONG).show();
        Toast.makeText(getApplicationContext(),
                "Assignment Created Succesfully", Toast.LENGTH_LONG).show();
        Assignment_Create.this.finish();
        break;
    }
}

private void updateDisplay(TextView dateDisplay, Calendar date) {
    dateDisplay.setText(new StringBuilder()
            // Month is 0 based so add 1
            .append(date.get(Calendar.MONTH) + 1).append("-")
            .append(date.get(Calendar.DAY_OF_MONTH)).append("-")
            .append(date.get(Calendar.YEAR)).append(" "));
}

@SuppressWarnings("deprecation")
public void showDateDialog(TextView dateDisplay, Calendar date) {
    activeDateDisplay = dateDisplay;
    activeDate = date;
    showDialog(DATE_DIALOG_ID);
}

private OnDateSetListener dateSetListener = new OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {
        activeDate.set(Calendar.YEAR, year);
        activeDate.set(Calendar.MONTH, monthOfYear);
        activeDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        updateDisplay(activeDateDisplay, activeDate);

        unregisterDateDisplay();
    }
};

private void unregisterDateDisplay() {
    activeDateDisplay = null;
    activeDate = null;
}

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
        return new DatePickerDialog(this, dateSetListener,
                activeDate.get(Calendar.YEAR),
                activeDate.get(Calendar.MONTH),
                activeDate.get(Calendar.DAY_OF_MONTH));
    }
    return null;
}

@SuppressWarnings("deprecation")
@Override
protected void onPrepareDialog(int id, Dialog dialog) {
    super.onPrepareDialog(id, dialog);
    switch (id) {
    case DATE_DIALOG_ID:
        ((DatePickerDialog) dialog).updateDate(
                activeDate.get(Calendar.YEAR),
                activeDate.get(Calendar.MONTH),
                activeDate.get(Calendar.DAY_OF_MONTH));
        break;
    }
}
}

我尝试使用以下链接，但没有按照我想要的方式获得解决方案

how to not allow user select past date in datepicker?

Setting upper and lower date limits to date picker dialog

How to set min-max age limit with datepicker android

Date Picker with max and minimum date in onDateChanged() in Android 1.5?

所以我设置日期，现在当用户点击提交按钮，如果日期选择器2的日期小于日期选择器1的日期，则应该出现警告对话框..

所以我做错了，任何人都可以帮助我。提前谢谢。

Answer 1

只需比较日历的getTimeInMillis

Calendar mCalendarFirst = Calendar.getInstance();
mSelectedCalendar.set(Calendar.YEAR, your_year_from_frist_datepicker);
mSelectedCalendar.set(Calendar.MONTH, your_month_from_frist_datepicker);
mSelectedCalendar.set(Calendar.DAY_OF_MONTH, your_day_from_frist_datepicker);

Calendar mCalendarSecond = Calendar.getInstance();
mSelectedCalendar.set(Calendar.YEAR, your_year_from_second_datepicker);
mSelectedCalendar.set(Calendar.MONTH, your_month_from_seconf_datepicker);
mSelectedCalendar.set(Calendar.DAY_OF_MONTH, your_day_from_second_datepicker);

if(mCalendarSecond.getTimeInMillis() <= mCalendarFirst.getTimeInMillis())
{
        //Your second date is less than first date
        //Show your dialog here.
}

<强>更新

根据您的情况使用以下内容：

if(Code.DueDate.getTimeInMillis() <= Code.AssignDate.getTimeInMillis())
{
        //Your second date is less than first date
        //Show your dialog here.
}

尝试以下代码：

public void onClick(View v) {
        switch (v.getId()) {
        case R.id.submit:

            Code.title = editTextTitle.getText().toString().trim();
            Code.description = editTextDesc.getText().toString().trim();

            Code.diff = Code.DueDate.getTimeInMillis()
                    - Code.AssignDate.getTimeInMillis();
            Code.days = Code.diff / (24 * 60 * 60 * 1000);
            Code.strDays = String.valueOf(Code.days);

            Date assignDate = new Date(Code.AssignDate.getTimeInMillis());
            Date dueDate = new Date(Code.DueDate.getTimeInMillis());

            if (Code.DueDate.getTimeInMillis() <= Code.AssignDate.getTimeInMillis()){
                AlertDialog.Builder myDialogBattery = new AlertDialog.Builder(
                        Assignment_Create.this);
                myDialogBattery.setTitle("How to use Less Battery");
                myDialogBattery.setMessage("hahahahahaha");
                myDialogBattery.setPositiveButton("OK",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface arg0, int arg1) {
                            }
                        });
                myDialogBattery.show();
            }else
            {
                if (isEdit) {
                    this.dataManipulator = new DataManipulator(this);
                    this.dataManipulator.update(updateId);
                    this.dataManipulator.close();
                } else {
                    this.dataManipulator = new DataManipulator(this);
                    this.dataManipulator.insert(Code.title, Code.description,
                            Code.strDays);
                    this.dataManipulator.close();
                }

                Toast.makeText(getApplicationContext(),
                        "Details are saved successfully", Toast.LENGTH_LONG).show();
                Toast.makeText(getApplicationContext(),
                        "Assignment Created Succesfully", Toast.LENGTH_LONG).show();
                Assignment_Create.this.finish();
            }
            break;
        }
    }

Answer 2

尝试以下代码。此处firstDate和secondDate是日期对象

if (firstDate.after(secondDate)) { OR //secondDate.before(firstDate)

    //display alert here

} else {

}

如何限制用户根据android中日期选择器的其他日期设置日期

2 个答案: