我无法实现基于Viewpager的片段的数据更新。 事实上，我有一项服务可以验证和检索在线发布的最新信息更新，并提供给我的数据库。 一旦工作完成，我应该更新屏幕，但这就是我被困住的地方。 我尝试了很多技术，但在那之前我还没有收到更新屏幕。
我对这个主题感到不知所措，以至于我没有正确的话语。 谢谢你的帮助
我的主要活动
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
private static final String TAG = "MainActivity";
ViewPager viewPager;
TabLayout tabLayout;
DrawerLayout drawer;
NavigationView navigationView;
ActionBarDrawerToggle toggle;
Context mContext;
PagerAdapter vAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
mContext = this;
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
reloadData();
}
private void setupViewPager(ViewPager viewPager) {
vAdapter = new PagerAdapter(getSupportFragmentManager());
vAdapter.addFragment(new StartFragment(), "START");
vAdapter.addFragment(new MapFragment(), "MAP");
vAdapter.addFragment(new ListArticle(), "ARTICLES");
viewPager.setAdapter(vAdapter);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.nav_profile:
startActivity(new Intent(mContext, ProfileActivity.class));
break;
case R.id.nav_map:
startActivity(new Intent(mContext, MapActivity.class));
break;
case R.id.nav_history:
startActivity(new Intent(mContext, HistoryActivity.class));
break;
case R.id.nav_help:
break;
default:
return false;
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void scheduleJobMatchDataUpdate(){
JobScheduler jobScheduler = (JobScheduler)getApplicationContext()
.getSystemService(JOB_SCHEDULER_SERVICE);
ComponentName componentName = new ComponentName(this,
MatchUpdatedJob.class);
JobInfo jobInfo = null;
//if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
jobInfo = new JobInfo.Builder(1, componentName)
.setPeriodic(60000).setRequiredNetworkType(
JobInfo.NETWORK_TYPE_NOT_ROAMING)
.setPersisted(true).build();
// }
jobScheduler.schedule(jobInfo);
}
public void reloadData() {
scheduleJobMatchDataUpdate();
StartFragment fragment = new StartFragment();
if (fragment.isInLayout()) {
fragment.data();
}
}
}
//My PagerAdapter
public class PagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public PagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
public class StartFragment extends Fragment implements ArticleAdapter.ClickCB,
BaseSliderView.OnSliderClickListener, ViewPagerEx.OnPageChangeListener{
static final String TAG = "StartFragment";
public StartFragment() {
// Let empty
}
LinearLayoutManager mLayoutManager;
private SwipeRefreshLayout srl;
ArticleAdapter mAdapter;
Context mContext;
List<Article> mList;
List<Article> mListSelected = new ArrayList<>();
Call<List<Article>> call;
ApiService service;
RecyclerView rcv;
Bundle bundle;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.mContext = getActivity();
this.mList = Article.findAll(this.mContext);
this.bundle = savedInstanceState;
service = RetrofitBuilder.createService(ApiService.class);
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_start, container, false);
SliderLayout mSlider = (SliderLayout) view.findViewById(R.id.slider);
String[] imgUrl = new String[3];
imgUrl[0] = "http://...1.jpg";
imgUrl[1] = "http://...2.jpg";
imgUrl[2] = "http://...3.jpg";
for (String s: imgUrl){
MatchSliderView sliderView = new MatchSliderView(getContext());
sliderView
.image(s)
.description("...")
.setScaleType(BaseSliderView.ScaleType.Fit)
.setOnSliderClickListener(this);
sliderView.bundle(new Bundle());
sliderView.getBundle()
.putString("extra",s);
mSlider.addSlider(sliderView);
}
mSlider.setPresetTransformer(SliderLayout.Transformer.Accordion);
// mSlider.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);
mSlider.setCustomAnimation(new DescriptionAnimation());
mSlider.setDuration(5000);
mSlider.addOnPageChangeListener(this);
rcv = (RecyclerView) view.findViewById(R.id.rcv);
mLayoutManager = new LinearLayoutManager(MainApplication.getContext());
mLayoutManager.setOrientation(1);
rcv.setLayoutManager(mLayoutManager);
rcv.setHasFixedSize(true);
//mList = Article.findAll(this.mContext);
this.mAdapter = new ArticleAdapter(this.mContext,
StartFragment.this, mList, mListSelected);
rcv.setItemViewCacheSize(mList.size());
rcv.setAdapter(this.mAdapter);
Flubber.with()
.animation(Flubber.AnimationPreset.FADE_IN_UP)
.repeatCount(1)
.duration(2000)
.createFor(rcv)
.start();
srl = (SwipeRefreshLayout)view.findViewById(R.id.swipeRefreshLayout);
srl.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
onItemsLoadComplete();
}
});
return view;
}
void onItemsLoadComplete() {
loadData();
srl.setRefreshing(false);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onSliderClick(BaseSliderView slider) {
Toast.makeText(mContext, slider.getmTitle(),
Toast.LENGTH_SHORT).show();
}
@Override
public void removeNotify(Selection selection) {
badgeView.decrement();
}
public void loadData(){
try{
call = service.matchs();
call.enqueue(new Callback<List<Article>>() {
@Override
public void onResponse(Call<List<Article>> call, Response<List<Article>> response) {
if(response.isSuccessful()){
Article.deleteAll(mContext);
Article.saveAll(mContext,response.body());
}else{
Toast.makeText(mContext, "Update failed!", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onFailure(Call<List<Article>> call, Throwable t) {
call.isCanceled();
t.printStackTrace();
}
});
}catch (Exception e){
e.printStackTrace();
Toast.makeText(mContext, e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
public void refreshData(){
mList.clear();
mList.addAll(Article.findAll(this.mContext));
mAdapter.swap((ArrayList<Article>)mList);
}
@Override
public void onPause() {
super.onPause();
if (srl!=null) {
srl.setRefreshing(false);
srl.destroyDrawingCache();
srl.clearAnimation();
}
}
}
public class ArticleAdapter extends RecyclerView.Adapter<ArticleAdapter.ViewHolder> implements Filterable {
private Context mContext;
private static final String LOG_TAG = ArticleAdapter.class.getSimpleName();
List<Article> mListArticles = new ArrayList<>();
private List<Article> articleList;
private List<Article> articleListFiltered;
private ArticlesAdapterListener listener;
public ArticleAdapter(Context context, List<Article> mListItems){
this.mContext = context;
//this.mListArticles = mListItems;
if (mListArticles != null) {
mListArticles.clear();
mListArticles.addAll(mListItems);
}
else {
this.mListArticles = mListItems;
}
notifyDataSetChanged();
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_article, parent, false);
return new ViewHolder(mContext, mListArticles, view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Article item = mListArticles.get(position);
holder.title.setText(Html.fromHtml( " " + item.getTitre()));
//Glide.with(this).load(item.getMedia()).into((ImageView) findViewById(R.id.media));
if(item.getMedia() != null && item.getMedia().length() >10) {
Picasso.with(mContext).load(item.getMedia()).into(holder.img);
}
}
@Override
public int getItemCount() {
return mListArticles.size();
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charString = charSequence.toString();
if (charString.isEmpty()) {
articleListFiltered = articleList;
} else {
List<Article> filteredList = new ArrayList<>();
for (Article row : articleList) {
// name match condition. this might differ depending on your requirement
// here we are looking for name or phone number match
if (row.getTitre().toLowerCase().contains(charString.toLowerCase())) {
filteredList.add(row);
}
}
articleListFiltered = filteredList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = articleListFiltered;
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
articleListFiltered = (ArrayList<Article>) results.values;
notifyDataSetChanged();
}
};
}
public static class ViewHolder extends RecyclerView.ViewHolder{
private Context mContext;
private List<Article> mItems;
public TextView title;
public ImageView img;
public ViewHolder(Context context, List<Article> newsList, View view){
super(view);
this.mContext = context;
this.mItems = newsList;
this.title= (TextView)view.findViewById(R.id.title);
this.img= (ImageView) view.findViewById(R.id.media);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(mContext, ArticleDetailActivity.class);
intent.putExtra("id", mItems.get(getAdapterPosition()).getId());
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(intent);
}
});
}
}
public interface ArticlesAdapterListener {
void onArticleSelected(Article article);
}
}
public class PagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public PagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
答案 0 :(得分：0)
mAdapter.swap((ArrayList<Article>)mList);
mAdapter.notifyDataSetChanged();