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[英]Android passing data while using Activity, Fragment, Listview and Tabs
[英]passing data from activity to tabs fragment
無法將檢索到的數據列表從改造中傳遞到片段中的recyclerview中! 嘗試了一些解決方案,但不起作用!
我嘗試過創建片段和傳遞中的方法,但是不起作用! 越來越空!
活動
TabLayout tabLayout;
ViewPager viewPager;
RecyclerView recyclerView;
//vars
private Dto dto;
List<Post_DTO> post_dto_list=new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState)
{
dto=new Dto();
UpdateList();
super.onCreate(savedInstanceState);
setContentView(R.layout.home_layout);
tabLayout=(TabLayout)findViewById(R.id.tabLayout);
viewPager=(ViewPager)findViewById(R.id.viewPager);
tabLayout.addTab(tabLayout.newTab().setText("Dashboard"));
tabLayout.addTab(tabLayout.newTab().setText("Converations"));
tabLayout.addTab(tabLayout.newTab().setText("Profile"));
PostFragment pf=new PostFragment();
pf.passData(getApplicationContext(),post_dto_list);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
//ft.add(R.id.posts_recyclerview, ft);
ft.addToBackStack(null);
ft.commit();
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final MyAdapter adapter = new MyAdapter(this,getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
System.out.println(tab.getPosition());
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void UpdateList() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(getString(R.string.postUrl))
.addConverterFactory(GsonConverterFactory.create())
.build();
PostsInterface postsInterface =retrofit.create(PostsInterface.class);
Call<Post_DTO_Resp> call= postsInterface.getPosts();
call.enqueue(new Callback<Post_DTO_Resp>() {
@Override
public void onResponse(Call<Post_DTO_Resp> call, Response<Post_DTO_Resp> response) {
//pDialog.dismiss();
if(!response.isSuccessful())
{
Toast.makeText(getApplicationContext(),"Loading the posts!",Toast.LENGTH_SHORT).show();
}
Post_DTO_Resp posts = response.body();
post_dto_list=posts.getPost_dto_list();
//dto.setList(post_dto_list);
}
@Override
public void onFailure(Call<Post_DTO_Resp> call, Throwable t) {
//pDialog.dismiss();
if(t.getMessage().equals("End of input at line 1 column 1 path $"))
{
Toast.makeText(getApplicationContext(), "There are no posts!", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), "Api Error!", Toast.LENGTH_LONG).show();
}
}
});
}
}
分段!
public class PostFragment extends Fragment {
RecyclerView recyclerView;
View v;
Dto dtobject;
private static final String DESCRIBABLE_KEY = "list";
private Describable mDescribable;
List<Post_DTO> post_dto_list;
public PostFragment() {
// Required empty public constructor
}
public void passData(Context context, List<Post_DTO> list) {
//mContext = context;
post_dto_list = list;
// mIndex = pos;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
v=inflater.inflate(R.layout.fragment_posts, container, false);
recyclerView=(RecyclerView) v.findViewById(R.id.posts_recyclerview);
RecyclerViewAdapter recyclerViewAdapter=new RecyclerViewAdapter(getContext(),post_dto_list);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(recyclerViewAdapter);
//listupdater();
return v;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
}
只想從Activity獲取post_dto_list到fragment類! 建議!
您可以使用bundle
將列表從活動傳遞到片段。
活動中:
Bundle bundle = new Bundle();
bundle.putSerializable("list", mList);
mFragment.setArguments(bundle);
然后在您的片段中:
mList = getIntent().getExtras().getSerializable("list"));
但POJO
,你的列表中包含應parcelable
( Parcelable
優於Serializable
)。
您的POJO應該類似於:
public class MyPOJO implements Parcelable {
有關更多信息,請參考this 。
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