java – 片段活动的简单时间戳
作者：互联网
我试图从片段中的edittext启动时间戳
Buffet_offerings_breakfast_menu2.java
public class Buffet_offerings_breakfast_menu2 extends Fragment implements PickTime{
RadioGroup radioGroup;
EditText ed1,ed2;
boolean flag =false;
TimePickerFragment newFragment;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
final View view=inflater.inflate(R.layout.buffet_offerings_breakfast_menu2, container, false);
ed1 = (EditText) view.findViewById(R.id.from_lunch_edit_text_id);
ed2 = (EditText) view.findViewById(R.id.to_lunch_edit_text_id);
radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup1);
newFragment = new TimePickerFragment();
ed1.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus){
flag =false;
newFragment.show(getFragmentManager(), "timePicker");
}
}
});
ed2.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus){
flag =true;
newFragment.show(getFragmentManager(), "timePicker");
}
}
});
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){
public void onCheckedChanged(RadioGroup group, int checkedId) {
// checkedId is the RadioButton selected
if(checkedId == R.id.SelectDaysRG_ID)
{
view.findViewById(R.id.linearLayout_individualdays).setVisibility(View.VISIBLE);
}
else if(checkedId == R.id.WeekdaysRG_ID)
{
view.findViewById(R.id.linearLayout_individualdays).setVisibility(View.INVISIBLE);
}
else if(checkedId == R.id.WeekendsRG_ID)
{
view.findViewById(R.id.linearLayout_individualdays).setVisibility(View.INVISIBLE);
}
}
});
return view;
}
@Override
public void returnTime(String value) {
// TODO Auto-generated method stub
if(flag==false)
ed1.setText(value);
else if(flag==true)
ed2.setText(value);
}
}
TimePickerFragment.java
public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
public interface PickTime
{
public void returnTime(String value);
}
PickTime mCallback;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
mCallback = (PickTime) getActivity();
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// Do something with the time chosen by the user
if(mCallback!=null)
{
StringBuilder sb = new StringBuilder();
sb.append(hourOfDay);
sb.append(":");
sb.append(minute);
mCallback.returnTime(sb.toString());
}
}
}
登录::
12-27 08:55:53.543: E/AndroidRuntime(279): FATAL EXCEPTION: main
12-27 08:55:53.543: E/AndroidRuntime(279): java.lang.ClassCastException: com.project.findmybuffet.BuffetOfferings_MainFragmentActivity
12-27 08:55:53.543: E/AndroidRuntime(279): at com.project.findmybuffet.TimePickerFragment.onCreateDialog(TimePickerFragment.java:24)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.support.v4.app.DialogFragment.getLayoutInflater(DialogFragment.java:295)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.os.Handler.handleCallback(Handler.java:587)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.os.Handler.dispatchMessage(Handler.java:92)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.os.Looper.loop(Looper.java:123)
12-27 08:55:53.543: E/AndroidRuntime(279): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-27 08:55:53.543: E/AndroidRuntime(279): at java.lang.reflect.Method.invokeNative(Native Method)
12-27 08:55:53.543: E/AndroidRuntime(279): at java.lang.reflect.Method.invoke(Method.java:521)
12-27 08:55:53.543: E/AndroidRuntime(279): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-27 08:55:53.543: E/AndroidRuntime(279): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-27 08:55:53.543: E/AndroidRuntime(279): at dalvik.system.NativeStart.main(Native Method)
{编辑}托管片段活动
BuffetOfferings_MainFragmentActivity.java
public class BuffetOfferings_MainFragmentActivity extends FragmentActivity{
Button back_button;
FragmentManager manager;
FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.buffet_offerings_fragment_main_reference);
Buffet_offerings_breakfast_menu1 breakfast_fragment=new Buffet_offerings_breakfast_menu1();
Buffet_offerings_lunch_menu1 lunch_fragment=new Buffet_offerings_lunch_menu1();
Buffet_offerings_dinner_menu1 dinner_fragment=new Buffet_offerings_dinner_menu1();
manager=getSupportFragmentManager();
transaction=manager.beginTransaction();
transaction.add(R.id.BREAKFAST_LAYOUT_ID,breakfast_fragment, "breakfast_menu1_fragment");
transaction.add(R.id.LUNCH_LAYOUT_ID,lunch_fragment, "lunch_menu1_fragment");
transaction.add(R.id.DINNER_LAYOUT_ID,dinner_fragment, "dinner_menu1_fragment");
transaction.commit();
back_button=(Button) findViewById(R.id.TopNavigationBarRestaurantBuffetOfferingsBackButton);
back_button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
public void BreakfastRedMenu1(View V){
Buffet_offerings_breakfast_menu2 breakfast_fragment1=new Buffet_offerings_breakfast_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.BREAKFAST_LAYOUT_ID, breakfast_fragment1, "Tag1");
transaction.commit();
}
public void LunchRedMenu1(View V){
Buffet_offerings_lunch_menu2 lunch_fragment1=new Buffet_offerings_lunch_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.LUNCH_LAYOUT_ID, lunch_fragment1, "Tag2");
transaction.commit();
}
public void DinnerRedMenu1(View V){
Buffet_offerings_dinner_menu2 dinner_fragment1=new Buffet_offerings_dinner_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.DINNER_LAYOUT_ID, dinner_fragment1, "Tag3");
transaction.commit();
}
public void BreakfastGreenMenu2(View V){
Buffet_offerings_breakfast_menu1 breakfast_fragment2=new Buffet_offerings_breakfast_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.BREAKFAST_LAYOUT_ID, breakfast_fragment2, "Tag4");
transaction.commit();
}
public void LunchGreenMenu2(View V){
Buffet_offerings_lunch_menu1 lunch_fragment2=new Buffet_offerings_lunch_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.LUNCH_LAYOUT_ID, lunch_fragment2, "Tag5");
transaction.commit();
}
public void DinnerGreenMenu2(View V){
Buffet_offerings_dinner_menu1 dinner_fragment2=new Buffet_offerings_dinner_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.DINNER_LAYOUT_ID, dinner_fragment2, "Tag6");
transaction.commit();
}
}
解决方法:
所有Fragment-to-Fragment通信都是通过相关的Activity完成的.两个碎片永远不应该直接通信.
http://developer.android.com/training/basics/fragments/communicating.html
您可以作为回调接口参与活动.所以在活动中获取时间然后与片段进行通信.
例：
为了示例,我正在扩展Activity.您可以扩展FragmentAcitivty和使用支持库并进行适当的导入.
public class MainActivity extends Activity implements PickTime{
EditFragment newFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
newFragment = new EditFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.container, newFragment);
//transaction.addToBackStack(null);
transaction.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void returnTime(String value) {
// TODO Auto-generated method stub
if(newFragment.isVisible())
{
newFragment.setEdittextvalue(value);
}
}
}
片段只有一个Edittext
public class EditFragment extends Fragment {
EditText ed;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragmentlayout,container,false);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
ed = (EditText) getView().findViewById(R.id.editText1);
ed.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
TimePickerFragment newFragment = new TimePickerFragment();
newFragment.show(getFragmentManager(), "timePicker");
}
});
}
public void setEdittextvalue(String value) {
// TODO Auto-generated method stub
ed.setText(value);
}
}
TimerPickerFragment
public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
mCallback = (PickTime) activity;
}
public interface PickTime
{
public void returnTime(String value);
}
PickTime mCallback;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// Do something with the time chosen by the user
if(mCallback!=null)
{
StringBuilder sb = new StringBuilder();
sb.append(hourOfDay);
sb.append(":");
sb.append(minute);
mCallback.returnTime(sb.toString());
}
}
}
标签：android,java,android-fragments,android-timepicker 来源： https://codeday.me/bug/20191003/1847074.html