在选项卡片段错误中创建一个DatePicker和TimePicker [英] Create a DatePicker and TimePicker in the Tab Fragment error
问题描述
我正在尝试在tab片段内创建date picker和number picker，但是它得到了错误.我无法弄清错误，或者因为扩展fragment与扩展AppCompatActivity ??
I am trying to create date picker and number picker inside a tab fragment, but its getting error. I can't figure it out the error or I am doing at a wrong way because of extends fragment is different than the extends AppCompatActivity??
有人可以指出我想念的行会吗?
Can someone please point out what am I missing and guild ?
public class KeyInWeightF extends Fragment implements View.OnClickListener {
View contentView;
EditText btnTime;
EditText btnDate;
TimePickerDialog timePickerDialog;
DatePickerDialog datePickerDialog;
Calendar calender = Calendar.getInstance();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
contentView=inflater.inflate(R.layout.daily_weight_fragement, container, false);
return contentView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
btnTime = (EditText) contentView.findViewById(R.id.time_field);
btnTime.setOnClickListener(this);
btnDate = (EditText) contentView.findViewById(R.id.date_field);
btnDate.setOnClickListener(this);
}
@Override
public void onClick(View v){
switch (v.getId()){
case R.id.time_field:
timePickerDialog = new TimePickerDialog(KeyInWeightF.this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
Calendar timeCalendar = Calendar.getInstance();
timeCalendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
timeCalendar.set(Calendar.MINUTE,minute);
String timestring = DateUtils.formatDateTime(KeyInWeightF.this,timeCalendar.getTimeInMillis(),DateUtils.FORMAT_SHOW_TIME);
// KeyInWeightF.this error
btnTime.setText("Time:"+timestring);
}
},calender.get(Calendar.HOUR_OF_DAY),calender.get(Calendar.MINUTE),android.text.format.DateFormat.is24HourFormat(KeyInWeightF.this));
//KeyInWeightF.this error
timePickerDialog.show();
break;
case R.id.date_field:{
datePickerDialog =new DatePickerDialog(KeyInWeightF.this, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar dateCalender = Calendar.getInstance();
dateCalender.set(Calendar.YEAR,year);
dateCalender.set(Calendar.MONTH,monthOfYear);
dateCalender.set(Calendar.DAY_OF_MONTH,dayOfMonth);
String dateString = DateUtils.formatDateTime(KeyInWeightF.this,dateCalender.getTimeInMillis(),DateUtils.FORMAT_SHOW_TIME);
// error of KeyInWeightF.this why ?
btnDate.setText("Date:" + dateString);
}
},calender.get(Calendar.YEAR),calender.get(Calendar.MONTH),calender.get(Calendar.DAY_OF_MONTH));
datePickerDialog.show();
break;
}
}
}
错误Logcat
Error:(65, 54) error: method formatDateTime in class DateUtils cannot be applied to given types;
required: Context,long,int
found: KeyInWeightF,long,int
reason: actual argument KeyInWeightF cannot be converted to Context by method invocation conversion
Error:(72, 114) error: method is24HourFormat in class DateFormat cannot be applied to given types;
required: Context
found: KeyInWeightF
reason: actual argument KeyInWeightF cannot be converted to Context by method invocation conversion
Error:(88, 54) error: method formatDateTime in class DateUtils cannot be applied to given types;
required: Context,long,int
found: KeyInWeightF,long,int
reason: actual argument KeyInWeightF cannot be converted to Context by method invocation conversion
Error:(79, 35) error: no suitable constructor found for DatePickerDialog(KeyInWeightF,<anonymous OnDateSetListener>,int,int,int)
constructor DatePickerDialog.DatePickerDialog(Context,int,OnDateSetListener,int,int,int) is not applicable
(actual and formal argument lists differ in length)
constructor DatePickerDialog.DatePickerDialog(Context,OnDateSetListener,int,int,int) is not applicable
(actual argument KeyInWeightF cannot be converted to Context by method invocation conversion)
我该如何解决?
推荐答案
首先纠正您的onCreateView方法.
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
contentView=inflater.inflate(R.layout.daily_weight_fragement, container, false);
btnTime = (EditText) contentView.findViewById(R.id.time_field);
btnTime.setOnClickListener(this);
btnDate = (EditText) contentView.findViewById(R.id.date_field);
btnDate.setOnClickListener(this);
return contentView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
Logcat返回
错误:(79，35)错误:找不到适合的构造函数 DatePickerDialog(KeyInWeightF ,, int，int，int)构造函数 DatePickerDialog.DatePickerDialog(Context，int，OnDateSetListener，int，int，int) 不适用(实际和正式参数列表的长度不同) 构造函数 DatePickerDialog.DatePickerDialog(Context，OnDateSetListener，int，int，int) 不适用(实际参数KeyInWeightF无法转换为 按方法调用转换上下文)
Error:(79, 35) error: no suitable constructor found for DatePickerDialog(KeyInWeightF,,int,int,int) constructor DatePickerDialog.DatePickerDialog(Context,int,OnDateSetListener,int,int,int) is not applicable (actual and formal argument lists differ in length) constructor DatePickerDialog.DatePickerDialog(Context,OnDateSetListener,int,int,int) is not applicable (actual argument KeyInWeightF cannot be converted to Context by method invocation conversion)
解决方案
您应该使用 getActivity()而不是KeyInWeightF.this
getActivity() 在片段中返回该片段当前与之关联的活动.
getActivity() in a Fragment returns the Activity the Fragment is currently associated with.
timePickerDialog = new TimePickerDialog(getActivity(), new TimePickerDialog.OnTimeSetListener() {
与
String timestring = DateUtils.formatDateTime(getActivity(),timeCalendar.getTimeInMillis(),DateUtils.FORMAT_SHOW_TIME);
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