你好我正在开发一个能够设置事件日期和时间的应用程序。现在我成功加载TimePicker但是当我点击确定应用程序崩溃，我不明白为什么。有一个片段调用我的TimePicker片段，我想将结果检索到调用者片段。
谢谢。调用者片段：
class EnquiryAdmin"
ordering = ['-message__sent_at']
TimePickerFragment：
package com.example.matant.gpsportclient.Controllers;
import android.app.Activity;
import android.app.DialogFragment;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Switch;
import android.widget.TextView;
import com.example.matant.gpsportclient.R;
import com.example.matant.gpsportclient.Utilities.TimePicker;
public class CreateEventFragmentController extends Fragment implements View.OnClickListener,TimePicker.OnCompleteListener {
private Button btnStartdate,btnstartTime,btnendTime,btninviteUsers,btnEndDate,btnSave,btnCancel;
private EditText addressEditText,maxParticipantsEdittext,minAgeEditText;
private CheckBox privateEventCbox,reccuringEventCbox,specificAddressCbox;
private Spinner sportSpinner,genderSpinner,radiusSpinner;
public CreateEventFragmentController() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_create_event_fragment_controller, container, false);
//initialize the widgets
btnStartdate = (Button) v.findViewById(R.id.buttonFromDate);
btnstartTime = (Button) v.findViewById(R.id.buttonFromTime);
btnEndDate = (Button) v.findViewById(R.id.buttonEndDate);
btnendTime = (Button) v.findViewById(R.id.buttonEndTime);
btninviteUsers = (Button) v.findViewById(R.id.buttonInviteUsers);
btnSave = (Button) v.findViewById(R.id.ButtonSave);
btnCancel = (Button) v.findViewById(R.id.ButtonCancel);
maxParticipantsEdittext = (EditText)v.findViewById(R.id.editTextMaxPaticipants);
minAgeEditText = (EditText)v.findViewById(R.id.editTextMinAge);
addressEditText = (EditText)v.findViewById(R.id.editTextLocation);
privateEventCbox = (CheckBox) v.findViewById(R.id.checkBoxPrivateEvent);
reccuringEventCbox = (CheckBox) v.findViewById(R.id.checkBoxRecurring);
specificAddressCbox = (CheckBox) v.findViewById(R.id.checkBoxSpecifcAddress);
sportSpinner = (Spinner) v.findViewById(R.id.spinnerSports);
genderSpinner = (Spinner) v.findViewById(R.id.spinnerGender);
radiusSpinner = (Spinner) v.findViewById(R.id.spinnerRadius);
//gender spinner
ArrayAdapter<CharSequence> genderAdapter = ArrayAdapter.createFromResource(v.getContext(), R.array.eventgender, android.R.layout.simple_spinner_item);
genderAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
genderSpinner.setAdapter(genderAdapter);
genderSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});//gender spinner
//Sport Spinner
ArrayAdapter<CharSequence> sportAdapter = ArrayAdapter.createFromResource(v.getContext(), R.array.kind_of_sport, android.R.layout.simple_spinner_item);
sportAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sportSpinner.setAdapter(sportAdapter);
sportSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
//Sport Spinner
//Radius Spinner
ArrayAdapter<CharSequence> radiusAdapter = ArrayAdapter.createFromResource(v.getContext(), R.array.radius_range, android.R.layout.simple_spinner_item);
radiusAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
radiusSpinner.setAdapter(radiusAdapter);
radiusSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
//Radius Spinner
addressEditText.setVisibility(v.GONE);
btninviteUsers.setVisibility(v.GONE);
//private event check box listener
privateEventCbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(privateEventCbox.isChecked())
btninviteUsers.setVisibility(v.VISIBLE);
else
btninviteUsers.setVisibility(v.GONE);
}
});//private event check box listener
//create event from specific location check box listener
specificAddressCbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(specificAddressCbox.isChecked())
addressEditText.setVisibility(v.VISIBLE);
else
addressEditText.setVisibility(v.GONE);
}
});//create event from specific location check box listener
btnstartTime.setOnClickListener(this);
btnendTime.setOnClickListener(this);
btnStartdate.setOnClickListener(this);
btnEndDate.setOnClickListener(this);
return v;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
@Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.buttonFromTime:
{
{
Bundle bundle = new Bundle();
bundle.putInt("Time", 1);
DialogFragment TP = new TimePicker();
TP.setArguments(bundle);
TP.show(getFragmentManager(),"TimePicker");
}
}
break;
case R.id.buttonEndTime:
{
{
Bundle bundle = new Bundle();
bundle.putInt("Time",2);
DialogFragment TP = new TimePicker();
TP.setArguments(bundle);
TP.show(getFragmentManager(),"TimePicker");
}
break;
}
}
}
@Override
public void onComplete(String flag,String time) {
switch(flag)
{
case "start_time":
btnstartTime.setText(time);
break;
case "end_time":
btnendTime.setText(time);
break;
}
}
}
我得到的错误：`
package com.example.matant.gpsportclient.Utilities;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.util.Log;
import java.util.Calendar;
/**
* Created by matant on 9/7/2015.
*/
public class TimePicker extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
public interface OnCompleteListener {
public void onComplete(String flag,String time);
}
private int Time_Picker ;
static final int START_TIME = 1;
static final int END_TIME = 2;
private OnCompleteListener mListener;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try{
mListener = (OnCompleteListener) getTargetFragment();
}catch (ClassCastException e)
{
Log.d("Class casting Error",e.getMessage());
}
}
@Override
public Dialog onCreateDialog(Bundle savedInstance){
final Calendar cal = Calendar.getInstance();
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
Bundle bundle = this.getArguments();
Log.d("Calendar",String.valueOf(hour)+":"+String.valueOf(minute));
if(bundle!=null){
Time_Picker = bundle.getInt("Time",1);
}
switch (Time_Picker)
{
case START_TIME: {
Time_Picker = START_TIME;
return new TimePickerDialog(getActivity(), this, hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity()));
}
case END_TIME:
{
Time_Picker = END_TIME;
return new TimePickerDialog(getActivity(), this, hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity()));
}
}
return null;
}
@Override
public void onTimeSet(android.widget.TimePicker view, int hourOfDay, int minute) {
Log.d("Calendar",String.valueOf(hourOfDay)+":"+String.valueOf(minute));
String s ="";
if(Time_Picker == START_TIME)
{
s = String.valueOf(hourOfDay)+":"+String.valueOf(minute);
mListener.onComplete("start_time",s);
}
else
{
s = String.valueOf(hourOfDay)+":"+String.valueOf(minute);
mListener.onComplete("end_time",s);
}
}
}
答案 0 :(得分：1)
您需要致电setTargetFragment才能成功使用getTargetFragment。在你的情况下
Bundle bundle = new Bundle();
bundle.putInt("Time", 1);
DialogFragment TP = new TimePicker();
TP.setArguments(bundle);
TP.setTargetFragment(this, 0)
TP.show(getFragmentManager(),"TimePicker");
您可以找到文档here