当我使用ViewPager + TabLaout + Fragment更新Fragment的数据时，它不起作用。 我已经向适配器添加了InstantiateItem（）和getItemPosition（）函数，但是它根本没有任何作用。 这个问题困扰了我很长时间，希望我能得到您的帮助。
这是适配器的代码。
public class SportTimeLinePagerAdapter extends FragmentPagerAdapter {
private ArrayList<String> titleList;
private ArrayList<Fragment> fragmentList;
public SportTimeLinePagerAdapter(FragmentManager fm, ArrayList<String> titleList, ArrayList<Fragment> fragmentList) {
super(fm);
this.titleList = titleList;
this.fragmentList = fragmentList;
}
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
switch (position){
case 0:
DayFragment dayFragment = (DayFragment) super.instantiateItem(container, position);
dayFragment.updataArgument(dayFragment.sporttype);
return dayFragment;
case 1:
WeekFragment weekFragment = (WeekFragment) super.instantiateItem(container,position);
weekFragment.updataArgument(weekFragment.sporttype);
return weekFragment;
case 2:
MonthFragment monthFragment = (MonthFragment) super.instantiateItem(container,position);
monthFragment.updataArgument(monthFragment.sporttype);
return monthFragment;
case 3:
TotalFragment totalFragment = (TotalFragment) super.instantiateItem(container,position);
totalFragment.updataArgument(totalFragment.sporttype);
return totalFragment;
}
return null;
}
@Override
public int getItemPosition(@NonNull Object object) {
return PagerAdapter.POSITION_NONE;
}
@Override
public int getCount() {
return fragmentList.size();
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return titleList.get(position);
}
}
这是活动的代码。我认为主要问题应该在此和适配器中。
public class SportTimeLineAllActivity extends AppCompatActivity implements View.OnClickListener {
@BindView(R.id.tv_sport_type)
NormalTextView tvSportType;
@BindView(R.id.iv_choiceSportType)
ImageView ivChoiceSportType;
@BindView(R.id.iv_share)
ImageView ivShare;
@BindView(R.id.tab_layout)
XTabLayout tabLayout;
@BindView(R.id.viewpager_date)
ViewPager viewpagerDate;
private Context mContext;
@BindView(R.id.iv_back)
ImageView ivBack;
@BindView(R.id.rlay_All)
LinearLayout rlayAll;
private NormalTextView tvAll;
private NormalTextView tvRunning;
private NormalTextView tvTrailrun;
private NormalTextView tvRunindoor;
private NormalTextView tvHiking;
private NormalTextView tvBiking;
private NormalTextView tvWalking;
private View view_alpha;
private PopupWindow popupWindow;
private Animation animation = null;
private int isOpen = 0; //
private int currentTab = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sport_timeline);
ButterKnife.bind(this);
mContext = this;
initTab();
}
/**
*
*/
private void initTab() {
ArrayList<String> titleData = new ArrayList<>();
titleData.add(getResources().getString(R.string.up_case_day));
titleData.add(getResources().getString(R.string.week));
titleData.add(getResources().getString(R.string.month));
titleData.add(getResources().getString(R.string.total));
ArrayList<Fragment> fragmentArrayList = new ArrayList<>();
fragmentArrayList.add(new DayFragment());
fragmentArrayList.add(new WeekFragment());
fragmentArrayList.add(new MonthFragment());
fragmentArrayList.add(new TotalFragment());
SportTimeLinePagerAdapter sportTimeLinePagerAdapter= new SportTimeLinePagerAdapter(
getSupportFragmentManager(),titleData,fragmentArrayList);
viewpagerDate.setAdapter(sportTimeLinePagerAdapter);
tabLayout.setupWithViewPager(viewpagerDate);
}
@OnClick({R.id.iv_back, R.id.rlay_All, R.id.iv_share})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.iv_back:
finish();
break;
case R.id.rlay_All:
initPopupWindow();
choiceSportType();
break;
}
}
/**
*
*/
private void choiceSportType() {
if (isOpen == 0) {
ivChoiceSportType.setImageResource(R.drawable.icon_takeup);
isOpen = 1;
} else if (isOpen == 1) {
ivChoiceSportType.setImageResource(R.drawable.icon_open);
isOpen = 0;
}
}
/**
*
*/
private void initPopupWindow() {
View view = LayoutInflater.from(mContext).inflate(R.layout.layout_popup_sport_all
, null, false);
tvAll = view.findViewById(R.id.tv_all);
tvRunning = view.findViewById(R.id.tv_running);
tvTrailrun = view.findViewById(R.id.tv_trailrun);
tvRunindoor = view.findViewById(R.id.tv_runindoor);
tvHiking = view.findViewById(R.id.tv_hiking);
tvBiking = view.findViewById(R.id.tv_biking);
tvWalking = view.findViewById(R.id.tv_walking);
view_alpha = view.findViewById(R.id.view_alpha);
tvAll.setOnClickListener(this);
tvRunning.setOnClickListener(this);
tvTrailrun.setOnClickListener(this);
tvRunindoor.setOnClickListener(this);
tvHiking.setOnClickListener(this);
tvBiking.setOnClickListener(this);
tvWalking.setOnClickListener(this);
view_alpha.setOnClickListener(this);
popupWindow = new PopupWindow(view, ViewGroup.LayoutParams.WRAP_CONTENT
, ViewGroup.LayoutParams.WRAP_CONTENT, true);
popupWindow.setAnimationStyle(R.style.PopupAnimation);
popupWindow.setTouchable(true);
popupWindow.setTouchInterceptor(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
return false;
}
});
popupWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));
popupWindow.showAsDropDown(rlayAll);
popupWindow.setClippingEnabled(true);
popupWindow.update();
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.tv_all:
popupWindow.dismiss();
tvSportType.setText("All");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("All");
break;
case R.id.tv_running:
popupWindow.dismiss();
tvSportType.setText("running");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("running");
initTab();
break;
case R.id.tv_trailrun:
popupWindow.dismiss();
tvSportType.setText("trilrun");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("trilrun");
break;
case R.id.tv_runindoor:
initTab();
popupWindow.dismiss();
tvSportType.setText("runnin door");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("runindoor");
break;
case R.id.tv_hiking:
popupWindow.dismiss();
tvSportType.setText("hiking");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("hiking");
initTab();
break;
case R.id.tv_biking:
popupWindow.dismiss();
tvSportType.setText("biking");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("hiking");
initTab();
break;
case R.id.tv_walking:
popupWindow.dismiss();
tvSportType.setText("walking");
isOpen = 1;
choiceSportType();
DayFragment.getInstance("walking");
initTab();
break;
case R.id.view_alpha:
popupWindow.dismiss();
isOpen = 1;
choiceSportType();
break;
}
}
}
这是我的片段代码之一。当我调试时，在onCreate函数中获得的包是空的。产生的运动类型也为空。
public class DayFragment extends Fragment {
@BindView(R.id.tv_currentValue)
NormalTextView tvCurrentValue;
@BindView(R.id.iv_tendency)
ImageView ivTendency;
@BindView(R.id.tv_currentUnit)
NormalTextView tvCurrentUnit;
@BindView(R.id.tv_firstValue)
NormalTextView tvFirstValue;
@BindView(R.id.tv_firstUnit)
NormalTextView tvFirstUnit;
@BindView(R.id.tv_secondValue)
NormalTextView tvSecondValue;
@BindView(R.id.tv_secondUnit)
NormalTextView tvSecondUnit;
@BindView(R.id.rlay_second)
RelativeLayout rlaySecond;
@BindView(R.id.tv_calorie)
NormalTextView tvCalorie;
@BindView(R.id.rlv_timeLine)
RecyclerView rlvTimeLine;
public String sporttype;
private List<SportTimelineBean> sportTimelineBeanList = new ArrayList<>();
private SportTimeLineAdapter sportTimeLineAdapter;
private LinearLayoutManager linearLayoutManager;
SportTimelineBean sportTimelineBeanWalk = new SportTimelineBean("walking", " ", "12:00-13:00");
SportTimelineBean sportTimelineBeanRun = new SportTimelineBean("running", "17/12", "14:09-15:40");
SportTimelineBean sportTimelineBeanHik = new SportTimelineBean("hiking", "12/12", "12:00-13:00");
public DayFragment() {
}
public static DayFragment getInstance(String sporttype) {
DayFragment dayFragment = new DayFragment();
Bundle bundle = new Bundle();
if (bundle != null) {
bundle.putString("sporttype", sporttype);
}
dayFragment.setArguments(bundle);
return dayFragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = getArguments();
if (bundle != null) {
sporttype = bundle.getString("sporttype");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_date, container, false);
ButterKnife.bind(this, view);
sportTimelineBeanList.clear();
sportTimelineBeanList.add(sportTimelineBeanWalk);
initData();
linearLayoutManager = new LinearLayoutManager(getActivity());
rlvTimeLine.setLayoutManager(linearLayoutManager);
rlvTimeLine.setHasFixedSize(true);
sportTimeLineAdapter = new SportTimeLineAdapter(sportTimelineBeanList);
rlvTimeLine.setAdapter(sportTimeLineAdapter);
return view;
}
@Override
public void onDestroyView() {
super.onDestroyView();
}
public void updataArgument(String sporttype) {
this.sporttype = sporttype;
Bundle args = getArguments();
if (args != null) {
args.putString("sporttype", sporttype);
}
}
private void initData() {
if (!StringUtils.isEmpty(sporttype)) {
sportTimelineBeanList.clear();
if (sporttype.equals("running")) {
sportTimelineBeanList.clear();
sportTimelineBeanList.add(sportTimelineBeanRun);
sportTimeLineAdapter.notifyDataSetChanged();
} else if (sporttype.equals("walking")) {
sportTimelineBeanList.clear();
sportTimelineBeanList.add(sportTimelineBeanWalk);
sportTimeLineAdapter.notifyDataSetChanged();
} else if (sporttype.equals("hiking")) {
sportTimelineBeanList.clear();
sportTimelineBeanList.add(sportTimelineBeanHik);
sportTimeLineAdapter.notifyDataSetChanged();
}
}
}
}
希望您能帮助我，我非常感谢。