使用 Executor 将 Master/Detail Flow 应用程序连接到服务器（新线程）
Connecting a Master/Detail Flow app to a server using Executor (New Thread)
我正在尝试在 android studio 中使用 Master/Detail 流模板制作一个应用程序，该应用程序从 rss 提要 link 中读取文章并将它们显示为左侧的列表手边并在右侧显示主要内容。我需要使用 Executor 连接到服务器以创建一个新线程，并将 Master/Detail 流模板中的占位符内容替换为提要中的信息。我最困惑的是如何使用 Executor 实际正确连接到服务器以及如何在 class 上实现它，其中所有内容都被放入列表中。请让我知道我应该在 classes 和方法中更新什么。
这是我正在使用的提要：http://www.goal.com/en/feeds/news?fmt=rss
这是 class 项目将被放入左侧列表的位置：
/**
* This class is to set up the content that will fill the recycler view. As of now it is filled with Dummy content. Real
* content will be implemented once server is connected
*/
public class SoccerAPI {
/**
* Array of dummy content to be displayed in the recyclerview
*/
public static final List<articles> ITEMS = new ArrayList<articles>();
/**
* Using Hashmap to search the array by id
*/
public static final Map<String, articles> ITEM_MAP = new HashMap<String, articles>();
private static final int COUNT = 25;
static {
// Adds dummy content to the array
for (int i = 1; i <= COUNT; i++) {
addItem(createArticleItem(i));
}
}
/**
* adds items to both the array and Hashmap
* @param item
*/
private static void addItem(articles item) {
ITEMS.add(item);
ITEM_MAP.put(item.id, item);
}
/**
* Creates the item "articles" which is the information from the array
* @param position
* @return
*/
private static articles createArticleItem(int position) {
return new articles(String.valueOf(position), "Item " + position, makeDetails(position));
}
/**
* Takes the details in the array and displays it in the recycler view
* @param position
* @return
*/
private static String makeDetails(int position) {
StringBuilder builder = new StringBuilder();
builder.append("Details about Item: ").append(position);
for (int i = 0; i < position; i++) {
builder.append("\nMore details information here.");
}
return builder.toString();
}
/**
* A getters and setters for the dummy content.
*/
public static class articles {
public final String id;
public final String content;
public final String details;
public articles(String id, String content, String details) {
this.id = id;
this.content = content;
this.details = details;
}
/**
* Returns a string version of the dummy content
* @return
*/
@Override
public String toString() {
return content;
}
}
}
这里是主机activity:
public class SoccerItemDetailHostActivity extends AppCompatActivity {
/**
* declaring the float variable rateValue to be used in the sharedPreferences for the ratingBar
*/
private float rateValue;
@Override
protected void onStart() {
super.onStart();
AlertDialog.Builder mBuild = new AlertDialog.Builder(SoccerItemDetailHostActivity.this);
mBuild.setTitle("Please rate the app");
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
Float ratinginsharedpreference = preferences.getFloat("Rating", 0);
View mView = getLayoutInflater().inflate(R.layout.soccerratingbar, null);
mBuild.setView(mView);
AlertDialog dialog = mBuild.create();
final RatingBar ratebar = (RatingBar) mView.findViewById(R.id.ratingBar);
if (ratinginsharedpreference != 0) {
ratebar.setRating(ratinginsharedpreference);
}
ratebar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
@Override
public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
rateValue = rating;
Toast.makeText(SoccerItemDetailHostActivity.this, "" + rating, Toast.LENGTH_SHORT).show();
}
});
Button btnSubmit = (Button) mView.findViewById(R.id.btnSubRating);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editor.putFloat("Rating", rateValue);
editor.apply();
Toast.makeText(getApplicationContext(), "Thank you for rating the app", Toast.LENGTH_LONG).show();
dialog.cancel();
}
});
dialog.show();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivitySocceritemDetailBinding binding = ActivitySocceritemDetailBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
/**
* Setting up the buttons to be displayed on screen. Finding the button value in the XML by the id
*/
Button save = findViewById(R.id.save);
ImageButton help = findViewById(R.id.help);
/**
* Setting up onClickListeners for each of the buttons. Right now only the messages are implemented
* until the app is connected to the server
*/
save.setOnClickListener(clk -> {
Snackbar snackbar = Snackbar.make(binding.getRoot(), "You saved the articles to your favourites", Snackbar.LENGTH_LONG);
snackbar.show();
}
);
help.setOnClickListener(clk -> {
AlertDialog alertDialog = new AlertDialog.Builder(SoccerItemDetailHostActivity.this).create();
alertDialog.setTitle("Help");
alertDialog.setMessage("To use this app please click on any of the articles listed on the left" +
" hand side to view the article in the main viewer. If you would like to save the article" +
" to your favourites, please hit the 'save' button if you would like to remove the article" +
" from your favourites please hit the 'delete' button. If you would like to load the article" +
" in a browser please hit the 'load' button. If you are enjoying the app please rate us" +
" by clicking on the little star icon under the help icon.");
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
});
ImageButton favouritesList = findViewById(R.id.goToFavouritesButton);
favouritesList.setOnClickListener(clk -> {
Intent intent = new Intent(this, SoccerFavouritesList.class);
startActivity(intent);
});
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = findViewById(R.id.soccerDrawerLayout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.nav_open, R.string.nav_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navView = findViewById(R.id.soccerSideMenu);
navView.setNavigationItemSelectedListener((item) -> {
onOptionsItemSelected(item);
drawer.closeDrawer(GravityCompat.START);
return false;
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menuactions, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.ocTranspoApp:
Intent ocTranspoApp = new Intent(getApplicationContext(), OCTranspoActivity.class);
startActivity(ocTranspoApp);
onStop();
break;
case R.id.carApp:
Intent carApp = new Intent(getApplicationContext(), CarActivity.class);
startActivity(carApp);
onStop();
break;
case R.id.movieApp:
Intent movieApp = new Intent(getApplicationContext(), MovieActivity.class);
startActivity(movieApp);
onStop();
break;
case R.id.soccerApp:
Intent soccerApp = new Intent(getApplicationContext(), SoccerItemDetailHostActivity.class);
startActivity(soccerApp);
onStop();
break;
}
return super.onOptionsItemSelected(item);
}
}
这是屏幕左侧的 ItemList 片段：
/**
* This fragment combines with the NavController. It shows the list of articles on the left hand side
*/
public class SoccerItemListFragment extends Fragment {
private FragmentSocceritemListBinding binding;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
binding = FragmentSocceritemListBinding.inflate(inflater, container, false);
return binding.getRoot();
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
RecyclerView recyclerView = binding.socceritemList;
/**
* Finding the layout for this fragment container
*/
View itemDetailFragmentContainer = view.findViewById(R.id.socceritem_detail_nav_container);
/* Click Listener to trigger navigation based on if you have
* a single pane layout or two pane layout
*/
View.OnClickListener onClickListener = itemView -> {
SoccerAPI.articles item =
(SoccerAPI.articles) itemView.getTag();
Bundle arguments = new Bundle();
arguments.putString(SoccerItemDetailFragment.ARG_ITEM_ID, item.id);
if (itemDetailFragmentContainer != null) {
Navigation.findNavController(itemDetailFragmentContainer)
.navigate(R.id.fragment_socceritem_detail, arguments);
} else {
Navigation.findNavController(itemView).navigate(R.id.show_socceritem_detail, arguments);
}
};
/*
* This lets you see the information from each article on the bigger part of the screen
*/
View.OnContextClickListener onContextClickListener = itemView -> {
SoccerAPI.articles item =
(SoccerAPI.articles) itemView.getTag();
Toast.makeText(
itemView.getContext(),
"Context click of item " + item.id,
Toast.LENGTH_LONG
).show();
return true;
};
setupRecyclerView(recyclerView, onClickListener, onContextClickListener);
}
/**
* Sets up the recycler view where the articles will be populated. The dummy content is there for now
* @param recyclerView
* @param onClickListener
* @param onContextClickListener
*/
private void setupRecyclerView(
RecyclerView recyclerView,
View.OnClickListener onClickListener,
View.OnContextClickListener onContextClickListener
) {
recyclerView.setAdapter(new SimpleItemRecyclerViewAdapter(
SoccerAPI.ITEMS,
onClickListener,
onContextClickListener
));
}
@Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
/**
* Setting up the adapter for the recyclerview
*/
public static class SimpleItemRecyclerViewAdapter
extends RecyclerView.Adapter<SimpleItemRecyclerViewAdapter.ViewHolder> {
private final List<SoccerAPI.articles> mValues;
private final View.OnClickListener mOnClickListener;
private final View.OnContextClickListener mOnContextClickListener;
SimpleItemRecyclerViewAdapter(List<SoccerAPI.articles> items,
View.OnClickListener onClickListener,
View.OnContextClickListener onContextClickListener) {
mValues = items;
mOnClickListener = onClickListener;
mOnContextClickListener = onContextClickListener;
}
/**
* Setting up the viewHolder
* @param parent
* @param viewType
* @return
*/
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
SocceritemListContentBinding binding =
SocceritemListContentBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false);
return new ViewHolder(binding);
}
/**
* Setting up the onBindViewHolder
* @param holder
* @param position
*/
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mIdView.setText(mValues.get(position).id);
holder.mContentView.setText(mValues.get(position).content);
holder.itemView.setTag(mValues.get(position));
holder.itemView.setOnClickListener(mOnClickListener);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holder.itemView.setOnContextClickListener(mOnContextClickListener);
}
}
/**
* Getting the item count from the array so it knows how many to show on screen
* @return
*/
@Override
public int getItemCount() {
return mValues.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView mIdView;
final TextView mContentView;
ViewHolder(SocceritemListContentBinding binding) {
super(binding.getRoot());
mIdView = binding.idText;
mContentView = binding.content;
}
}
}
}
这是右侧的详细片段：
/**
* This fragment displays the content from the array in SoccerAPI and displays the information in the bigger part of the
* screen (when in Tablet/Landscape mode).
*/
public class SoccerItemDetailFragment extends Fragment {
/**
* The fragment argument representing the item ID that this fragment
* represents.
*/
public static final String ARG_ITEM_ID = "item_id";
/**
* Setting the content from the articles method in the SoccerAPI class to a variable
*/
private SoccerAPI.articles mItem;
private FragmentSocceritemDetailBinding binding;
/**
* empty constructor
*/
public SoccerItemDetailFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
* Load the data from the dummy content
*/
if (getArguments().containsKey(ARG_ITEM_ID)) {
mItem = SoccerAPI.ITEM_MAP.get(getArguments().getString(ARG_ITEM_ID));
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
binding = FragmentSocceritemDetailBinding.inflate(inflater, container, false);
View rootView = binding.getRoot();
/**
* Show the dummy content as text in a TextView & in the toolbar if available.
*/
if (mItem != null) {
TextView textView = binding.socceritemDetail;
textView.setText(mItem.details);
}
return rootView;
}
@Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
}
Executor 将在后台或主线程之外帮助您 运行 任务，要实际获取 rss 数据，您必须使用像 retrofit or volley. There are several tutorials available on how to get this done, like this one: https://www.vogella.com/tutorials/Retrofit/article.html[=11= 这样的库]
我正在尝试在 android studio 中使用 Master/Detail 流模板制作一个应用程序，该应用程序从 rss 提要 link 中读取文章并将它们显示为左侧的列表手边并在右侧显示主要内容。我需要使用 Executor 连接到服务器以创建一个新线程，并将 Master/Detail 流模板中的占位符内容替换为提要中的信息。我最困惑的是如何使用 Executor 实际正确连接到服务器以及如何在 class 上实现它，其中所有内容都被放入列表中。请让我知道我应该在 classes 和方法中更新什么。
这是我正在使用的提要：http://www.goal.com/en/feeds/news?fmt=rss
这是 class 项目将被放入左侧列表的位置：
/**
* This class is to set up the content that will fill the recycler view. As of now it is filled with Dummy content. Real
* content will be implemented once server is connected
*/
public class SoccerAPI {
/**
* Array of dummy content to be displayed in the recyclerview
*/
public static final List<articles> ITEMS = new ArrayList<articles>();
/**
* Using Hashmap to search the array by id
*/
public static final Map<String, articles> ITEM_MAP = new HashMap<String, articles>();
private static final int COUNT = 25;
static {
// Adds dummy content to the array
for (int i = 1; i <= COUNT; i++) {
addItem(createArticleItem(i));
}
}
/**
* adds items to both the array and Hashmap
* @param item
*/
private static void addItem(articles item) {
ITEMS.add(item);
ITEM_MAP.put(item.id, item);
}
/**
* Creates the item "articles" which is the information from the array
* @param position
* @return
*/
private static articles createArticleItem(int position) {
return new articles(String.valueOf(position), "Item " + position, makeDetails(position));
}
/**
* Takes the details in the array and displays it in the recycler view
* @param position
* @return
*/
private static String makeDetails(int position) {
StringBuilder builder = new StringBuilder();
builder.append("Details about Item: ").append(position);
for (int i = 0; i < position; i++) {
builder.append("\nMore details information here.");
}
return builder.toString();
}
/**
* A getters and setters for the dummy content.
*/
public static class articles {
public final String id;
public final String content;
public final String details;
public articles(String id, String content, String details) {
this.id = id;
this.content = content;
this.details = details;
}
/**
* Returns a string version of the dummy content
* @return
*/
@Override
public String toString() {
return content;
}
}
}
这里是主机activity:
public class SoccerItemDetailHostActivity extends AppCompatActivity {
/**
* declaring the float variable rateValue to be used in the sharedPreferences for the ratingBar
*/
private float rateValue;
@Override
protected void onStart() {
super.onStart();
AlertDialog.Builder mBuild = new AlertDialog.Builder(SoccerItemDetailHostActivity.this);
mBuild.setTitle("Please rate the app");
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
Float ratinginsharedpreference = preferences.getFloat("Rating", 0);
View mView = getLayoutInflater().inflate(R.layout.soccerratingbar, null);
mBuild.setView(mView);
AlertDialog dialog = mBuild.create();
final RatingBar ratebar = (RatingBar) mView.findViewById(R.id.ratingBar);
if (ratinginsharedpreference != 0) {
ratebar.setRating(ratinginsharedpreference);
}
ratebar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
@Override
public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
rateValue = rating;
Toast.makeText(SoccerItemDetailHostActivity.this, "" + rating, Toast.LENGTH_SHORT).show();
}
});
Button btnSubmit = (Button) mView.findViewById(R.id.btnSubRating);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editor.putFloat("Rating", rateValue);
editor.apply();
Toast.makeText(getApplicationContext(), "Thank you for rating the app", Toast.LENGTH_LONG).show();
dialog.cancel();
}
});
dialog.show();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivitySocceritemDetailBinding binding = ActivitySocceritemDetailBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
/**
* Setting up the buttons to be displayed on screen. Finding the button value in the XML by the id
*/
Button save = findViewById(R.id.save);
ImageButton help = findViewById(R.id.help);
/**
* Setting up onClickListeners for each of the buttons. Right now only the messages are implemented
* until the app is connected to the server
*/
save.setOnClickListener(clk -> {
Snackbar snackbar = Snackbar.make(binding.getRoot(), "You saved the articles to your favourites", Snackbar.LENGTH_LONG);
snackbar.show();
}
);
help.setOnClickListener(clk -> {
AlertDialog alertDialog = new AlertDialog.Builder(SoccerItemDetailHostActivity.this).create();
alertDialog.setTitle("Help");
alertDialog.setMessage("To use this app please click on any of the articles listed on the left" +
" hand side to view the article in the main viewer. If you would like to save the article" +
" to your favourites, please hit the 'save' button if you would like to remove the article" +
" from your favourites please hit the 'delete' button. If you would like to load the article" +
" in a browser please hit the 'load' button. If you are enjoying the app please rate us" +
" by clicking on the little star icon under the help icon.");
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
});
ImageButton favouritesList = findViewById(R.id.goToFavouritesButton);
favouritesList.setOnClickListener(clk -> {
Intent intent = new Intent(this, SoccerFavouritesList.class);
startActivity(intent);
});
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = findViewById(R.id.soccerDrawerLayout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.nav_open, R.string.nav_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navView = findViewById(R.id.soccerSideMenu);
navView.setNavigationItemSelectedListener((item) -> {
onOptionsItemSelected(item);
drawer.closeDrawer(GravityCompat.START);
return false;
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menuactions, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.ocTranspoApp:
Intent ocTranspoApp = new Intent(getApplicationContext(), OCTranspoActivity.class);
startActivity(ocTranspoApp);
onStop();
break;
case R.id.carApp:
Intent carApp = new Intent(getApplicationContext(), CarActivity.class);
startActivity(carApp);
onStop();
break;
case R.id.movieApp:
Intent movieApp = new Intent(getApplicationContext(), MovieActivity.class);
startActivity(movieApp);
onStop();
break;
case R.id.soccerApp:
Intent soccerApp = new Intent(getApplicationContext(), SoccerItemDetailHostActivity.class);
startActivity(soccerApp);
onStop();
break;
}
return super.onOptionsItemSelected(item);
}
}
这是屏幕左侧的 ItemList 片段：
/**
* This fragment combines with the NavController. It shows the list of articles on the left hand side
*/
public class SoccerItemListFragment extends Fragment {
private FragmentSocceritemListBinding binding;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
binding = FragmentSocceritemListBinding.inflate(inflater, container, false);
return binding.getRoot();
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
RecyclerView recyclerView = binding.socceritemList;
/**
* Finding the layout for this fragment container
*/
View itemDetailFragmentContainer = view.findViewById(R.id.socceritem_detail_nav_container);
/* Click Listener to trigger navigation based on if you have
* a single pane layout or two pane layout
*/
View.OnClickListener onClickListener = itemView -> {
SoccerAPI.articles item =
(SoccerAPI.articles) itemView.getTag();
Bundle arguments = new Bundle();
arguments.putString(SoccerItemDetailFragment.ARG_ITEM_ID, item.id);
if (itemDetailFragmentContainer != null) {
Navigation.findNavController(itemDetailFragmentContainer)
.navigate(R.id.fragment_socceritem_detail, arguments);
} else {
Navigation.findNavController(itemView).navigate(R.id.show_socceritem_detail, arguments);
}
};
/*
* This lets you see the information from each article on the bigger part of the screen
*/
View.OnContextClickListener onContextClickListener = itemView -> {
SoccerAPI.articles item =
(SoccerAPI.articles) itemView.getTag();
Toast.makeText(
itemView.getContext(),
"Context click of item " + item.id,
Toast.LENGTH_LONG
).show();
return true;
};
setupRecyclerView(recyclerView, onClickListener, onContextClickListener);
}
/**
* Sets up the recycler view where the articles will be populated. The dummy content is there for now
* @param recyclerView
* @param onClickListener
* @param onContextClickListener
*/
private void setupRecyclerView(
RecyclerView recyclerView,
View.OnClickListener onClickListener,
View.OnContextClickListener onContextClickListener
) {
recyclerView.setAdapter(new SimpleItemRecyclerViewAdapter(
SoccerAPI.ITEMS,
onClickListener,
onContextClickListener
));
}
@Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
/**
* Setting up the adapter for the recyclerview
*/
public static class SimpleItemRecyclerViewAdapter
extends RecyclerView.Adapter<SimpleItemRecyclerViewAdapter.ViewHolder> {
private final List<SoccerAPI.articles> mValues;
private final View.OnClickListener mOnClickListener;
private final View.OnContextClickListener mOnContextClickListener;
SimpleItemRecyclerViewAdapter(List<SoccerAPI.articles> items,
View.OnClickListener onClickListener,
View.OnContextClickListener onContextClickListener) {
mValues = items;
mOnClickListener = onClickListener;
mOnContextClickListener = onContextClickListener;
}
/**
* Setting up the viewHolder
* @param parent
* @param viewType
* @return
*/
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
SocceritemListContentBinding binding =
SocceritemListContentBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false);
return new ViewHolder(binding);
}
/**
* Setting up the onBindViewHolder
* @param holder
* @param position
*/
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mIdView.setText(mValues.get(position).id);
holder.mContentView.setText(mValues.get(position).content);
holder.itemView.setTag(mValues.get(position));
holder.itemView.setOnClickListener(mOnClickListener);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holder.itemView.setOnContextClickListener(mOnContextClickListener);
}
}
/**
* Getting the item count from the array so it knows how many to show on screen
* @return
*/
@Override
public int getItemCount() {
return mValues.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView mIdView;
final TextView mContentView;
ViewHolder(SocceritemListContentBinding binding) {
super(binding.getRoot());
mIdView = binding.idText;
mContentView = binding.content;
}
}
}
}
这是右侧的详细片段：
/**
* This fragment displays the content from the array in SoccerAPI and displays the information in the bigger part of the
* screen (when in Tablet/Landscape mode).
*/
public class SoccerItemDetailFragment extends Fragment {
/**
* The fragment argument representing the item ID that this fragment
* represents.
*/
public static final String ARG_ITEM_ID = "item_id";
/**
* Setting the content from the articles method in the SoccerAPI class to a variable
*/
private SoccerAPI.articles mItem;
private FragmentSocceritemDetailBinding binding;
/**
* empty constructor
*/
public SoccerItemDetailFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
* Load the data from the dummy content
*/
if (getArguments().containsKey(ARG_ITEM_ID)) {
mItem = SoccerAPI.ITEM_MAP.get(getArguments().getString(ARG_ITEM_ID));
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
binding = FragmentSocceritemDetailBinding.inflate(inflater, container, false);
View rootView = binding.getRoot();
/**
* Show the dummy content as text in a TextView & in the toolbar if available.
*/
if (mItem != null) {
TextView textView = binding.socceritemDetail;
textView.setText(mItem.details);
}
return rootView;
}
@Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
}
Executor 将在后台或主线程之外帮助您 运行 任务，要实际获取 rss 数据，您必须使用像 retrofit or volley. There are several tutorials available on how to get this done, like this one: https://www.vogella.com/tutorials/Retrofit/article.html[=11= 这样的库]