我使用viewpager和Tablayout创建了一个基于Tab的应用程序.当我单击一个按钮时,会创建带有子片段的新选项卡.
我需要的是为我的标签指定不同的标签ID,每个标签都应该不同.我试过我采取标签的位置但不幸的是,它不起作用.当我尝试使用下面的代码来烘烤位置时,它最初只在创建第一个选项卡时起作用,而对于创建的其他选项卡不起作用.我不知道为什么会这样.另外,如果我删除标签,则位置不正确.
所以我需要一个替代解决方案来为每个创建的新标签分配一个TAB ID(数字或名称),以便在创建每个标签时,我需要向具有该标识的服务器调用请求,并根据标签ID填充数据
tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
@Override
public void onTabSelected(TabLayout.Tab tab) {
super.onTabSelected(tab);
viewPager.setCurrentItem(tab.getPosition());
selectedTabPosition = viewPager.getCurrentItem();
Toast.makeText(getActivity(),"Selected " + tab.getPosition(),Toast.LENGTH_SHORT).show();
Log.d("Selected","Selected " + tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
super.onTabUnselected(tab);
Log.d("Unselected","Unselected " + tab.getPosition());
}
});
我的ViewPageradapter是：
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final ArrayList<Fragment> mFragmentList = new ArrayList<>();
private final ArrayList<String> mFragmentTitleList = new ArrayList<>();
Context context;
ViewPager viewPager;
TabLayout tabLayout;
int selectedTabPosition;
private boolean doNotifyDataSetChangedOnce = false;
public ViewPagerAdapter(FragmentManager manager,Context context,ViewPager viewPager,TabLayout tabLayout) {
super(manager);
this.context = context;
this.viewPager = viewPager;
this.tabLayout = tabLayout;
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
if (doNotifyDataSetChangedOnce) {
doNotifyDataSetChangedOnce = false;
notifyDataSetChanged();
}
return mFragmentList.size();
}
public void addFrag(Fragment fragment,String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public void removeFrag(int position) {
removeTab(position);
Fragment fragment = mFragmentList.get(position);
mFragmentList.remove(fragment);
mFragmentTitleList.remove(position);
//destroyFragmentView(viewPager,position,fragment);
notifyDataSetChanged();
if (getCount() > 0) tabLayout.setupWithViewPager(viewPager);
//viewPager.setCurrentItem(getCount() - 1);
setupTabLayout();
}
public View getTabView(final int position) {
View view = LayoutInflater.from(context).inflate(R.layout.custom_tab_item,null);
TextView tabItemName = (TextView) view.findViewById(R.id.textViewTabItemName);
ImageView tabItemAvatar =
(ImageView) view.findViewById(R.id.imageViewTabItemAvatar);
ImageButton remove = (ImageButton) view.findViewById(R.id.imageButtonRemove);
if(getCount() == 1){
remove.setVisibility(View.INVISIBLE);
}
else{
remove.setVisibility(View.VISIBLE);
}
remove.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("Remove","Remove");
if(getCount() != 1){
removeFrag(position);
}
else{
// Toast.makeText("Atleast One Tab is requied")
}
}
});
tabItemName.setText(mFragmentTitleList.get(position));
tabItemName.setTextColor(context.getResources().getColor(android.R.color.background_light));
tabItemAvatar.setImageResource(R.drawable.boy);
return view;
}
public void setupTabLayout() {
selectedTabPosition = viewPager.getCurrentItem();
for (int i = 0; i < tabLayout.getTabCount(); i++) {
tabLayout.getTabAt(i).setCustomView(getTabView(i));
}
}
public void removeTab(int position) {
if (tabLayout.getChildCount() > 0 && tabLayout!=null) {
tabLayout.removeTabAt(position);
}
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
Parent Fragment:
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_parent,container,false);
getIDs(view);
setEvents();
return view;
}
private void getIDs(View view) {
viewPager = (ViewPager) view.findViewById(R.id.my_viewpager);
tabLayout = (TabLayout) view.findViewById(R.id.my_tab_layout);
add= (ImageView) view.findViewById(R.id.imageButtonAdd1);
adapter = new ViewPagerAdapter(getFragmentManager(),getActivity(),viewPager,tabLayout);
viewPager.setAdapter(adapter);
}
int selectedTabPosition;
private void setEvents() {
tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
@Override
public void onTabSelected(TabLayout.Tab tab) {
super.onTabSelected(tab);
viewPager.setCurrentItem(tab.getPosition());
selectedTabPosition = viewPager.getCurrentItem();
Toast.makeText(getActivity(),"Unselected " + tab.getPosition());
}
});
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(adapter.getCount() > 4){
Toast.makeText(getActivity(),"Only 5 Tabs allowed",Toast.LENGTH_SHORT).show();
}
else {
Bundle bundle = new Bundle();
bundle.putString("data","POS"+adapter.getCount());
FragmentChild fragmentChild = new FragmentChild();
fragmentChild.setArguments(bundle);
adapter.addFrag(fragmentChild,"POS"+adapter.getCount());
adapter.notifyDataSetChanged();
if (adapter.getCount() > 0) tabLayout.setupWithViewPager(viewPager);
viewPager.setCurrentItem(adapter.getCount() - 1);
setupTabLayout();
}
}
});
}
public void addPage(String pagename) {
Bundle bundle = new Bundle();
bundle.putString("data",pagename);
FragmentChild fragmentChild = new FragmentChild();
fragmentChild.setArguments(bundle);
adapter.addFrag(fragmentChild,pagename);
adapter.notifyDataSetChanged();
if (adapter.getCount() > 0) tabLayout.setupWithViewPager(viewPager);
viewPager.setCurrentItem(adapter.getCount() - 1);
setupTabLayout();
}
public void setupTabLayout() {
selectedTabPosition = viewPager.getCurrentItem();
for (int i = 0; i < tabLayout.getTabCount(); i++) {
tabLayout.getTabAt(i).setCustomView(adapter.getTabView(i));
}
}
儿童碎片：
public class FragmentChild extends Fragment {
String childname;
TextView textViewChildName;
EditText editText;
private GridView mGridView;
private ListItem mListItem;
private ListView mListview;
private ProgressBar mProgressBar;
private ProductViewAdapter mGridAdapter;
private ListViewAdapter mListAdapter = null;
private ArrayList<GridItem> mGridData;
private ArrayList<ListItem> mListData = null;
ListView listView;
CheckInterNetConnection check ;
Boolean isInternetPresent = false;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_child,false);
Bundle bundle = getArguments();
childname = bundle.getString("data");
getIDs(view);
setEvents();
return view;
}
private void getIDs(View view) {
//textViewChildName = (TextView) view.findViewById(R.id.textViewChild);
//textViewChildName.setText(childname);
//editText = (EditText) view.findViewById(R.id.editText);
//editText.setText("");
}
private void setEvents() {
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.e("onActivityCreated","onActivityCreated");
mGridView = (GridView) getView().findViewById(R.id.gridView);
mGridData = new ArrayList<>();
mGridAdapter = new ProductViewAdapter(getActivity(),R.layout.grid_product_layout,mGridData);
mGridView.setAdapter(mGridAdapter);
mListview = (ListView) getView().findViewById(R.id.list);
mListData = new ArrayList<>();
mListAdapter = new ListViewAdapter(getActivity(),R.layout.list_row,mListData);
mListview.setAdapter(mListAdapter);
}
@Override
public void onStart() {
super.onStart();
Log.e("onSTart","onSTart");
check = new CheckInterNetConnection(getActivity());
isInternetPresent = check.isConnectingToInternet();
if (isInternetPresent) {
//fetchProducts();
}
}
public void fetchProducts(){
Log.e("URL","http://13.126.17.194/products.PHP");
RestClientHelper.getInstance().get("http://13.126.17.194/products.PHP?tabid="{TAB ID HERE},new RestClientHelper.RestClientListener() {
@Override
public void onSuccess(String response) {
parseResult(response);
mListData.clear();
mListAdapter.setGridData(mListData);
mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,View v,int position,long id) {
try {
ListItem items;
GridItem item = (GridItem) parent.getItemAtPosition(position);
items = new ListItem();
items.setName(item.getTitle());
items.setType(item.getDescription());
mListData.add(items);
}
catch(Exception e){
}
finally {
mListAdapter.setGridData(mListData);
}
}
});
}
@Override
public void onError(String error) {
}
});
}
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("products");
GridItem item;
if(posts.length() <= 0){
RelativeLayout ly = (RelativeLayout) getView().findViewById(R.id.noOps);
ly.setVisibility(View.VISIBLE);
}
else {
// RelativeLayout ly = (RelativeLayout) getView().findViewById(R.id.noOps);
//ly.setVisibility(View.INVISIBLE);
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
String id = post.optString("id");
String title = post.optString("name");
String description = post.optString("description");
String image = post.optString("image");
String qty = post.optString("qty");
String quantityin = post.optString("quantityin");
String price = post.optString("price");
item = new GridItem();
item.setId(id);
item.setTitle(title);
item.setDescription(description);
item.setImage(image);
item.setQuantity(qty);
item.setQuantityIn(quantityin);
item.setUnitprice(price);
mGridData.add(item);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
finally {
mGridAdapter.setGridData(mGridData);
}
}
}
父母碎片：
public class FragmentParent extends Fragment {
private TabLayout tabLayout;
private ViewPager viewPager;
private ViewPagerAdapter adapter;
private ImageView add;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater,pagename);
adapter.notifyDataSetChanged();
if (adapter.getCount() > 0) tabLayout.setupWithViewPager(viewPager);
viewPager.setCurrentItem(adapter.getCount() - 1);
//setupTabLayout();
}
public void setupTabLayout() {
selectedTabPosition = viewPager.getCurrentItem();
for (int i = 0; i < tabLayout.getTabCount(); i++) {
tabLayout.getTabAt(i).setCustomView(adapter.getTabView(i));
}
}
}
请帮助我解决这个问题
解决方法
以下是我对该问题的解决方案：
首先,在名为ids.xml的res / values下创建一个id文件：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="tab_id_one" type="id"/>
<item name="tab_id_two" type="id"/>
</resources>
然后,在创建选项卡的代码中,执行以下操作：
for (int i = 0; i< tabLayout.getTabCount(); i++) {
TabLayout.Tab mTab = tabLayout.getTabAt(i);
if (mTab != null) {
switch (i){
case 0:
View tabViewOne = ((ViewGroup) tabLayout.getChildAt(0)).getChildAt(i);
tabViewOne.setId(R.id.tab_id_one);
//ect..
break;
case 1:
View tabViewTwo = ((ViewGroup) tabLayout.getChildAt(0)).getChildAt(i);
tabViewTwo.setId(R.id.tab_id_two);
//ect..
break;
case 2:
//etc..
}
}
}
注意：视图tabViewOne和tabViewTwo可以成为全局变量,它可以在类/活动/片段中的任何位置访问它们的ID.
