如何使 "See All Item" 按钮将数据从 RecyclerView 传递到另一个 RecyclerView 片段 - AndroidX
How to make "See All Item" button to pass data from RecyclerView to Another RecyclerView fragment - AndroidX
Q问题
I want to make the "See All Item" button to pass data from RecyclerView to Another RecyclerView fragment
it looks like play store that has the "More" button to see all item in another fragment
AdapterSectionHotTrendingNews.java
public class AdapterSectionHotTrendingNews extends RecyclerView.Adapter{
private Context mContext;
private ArrayList<ModelSectionHotTrendingNews> modelSectionHotTrendingNews;
public AdapterSectionHotTrendingNews(Context mContext, ArrayList<ModelSectionHotTrendingNews> modelSectionHotTrendingNews) {
this.mContext = mContext;
this.modelSectionHotTrendingNews = modelSectionHotTrendingNews;
}
@Override
public SectionHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_section_hottrendingnews, null);
return new SectionHotTrendingNewsViewHolder(v);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
SectionHotTrendingNewsViewHolder sectionHotTrendingNewsViewHolder = (SectionHotTrendingNewsViewHolder) holder;
ModelSectionHotTrendingNews modelSectionHotTrendingNewsX = modelSectionHotTrendingNews.get(position);
//Set
sectionHotTrendingNewsViewHolder.TVSectionTitle.setText(modelSectionHotTrendingNewsX.getHeaderTitle());
ArrayList singleSectionItems = modelSectionHotTrendingNewsX.getAllItemsInSection();
/*AdapterSingleHotLatestNews.RecyclerViewClickListener listenerLatestNews;
listenerLatestNews = new AdapterSingleHotLatestNews.RecyclerViewClickListener() {
@Override
public void onRowHotLatestNewsClick(View view, int position) {
}
@Override
public void onIconHotLatestNewsClick(View view, int position) {
}
};*/
AdapterSingleHotTrendingNews itemListDataAdapter = new AdapterSingleHotTrendingNews(mContext, singleSectionItems);
/*itemRowHolder.recycler_view_list.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// Disallow ScrollView to intercept touch events.
v.getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
//Allow ScrollView to intercept touch events once again.
v.getParent().requestDisallowInterceptTouchEvent(false);
break;
}
// Handle RecyclerView touch events.
v.onTouchEvent(event);
return true;
}
});*/
final String sectionTitle = modelSectionHotTrendingNewsX.getHeaderTitle();
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "click event on more, "+sectionTitle, Toast.LENGTH_SHORT).show();
}
});
/*Glide.with(mContext)
.load(feedItem.getImageURL())
.diskCacheStrategy(DiskCacheStrategy.ALL)
.centerCrop()
.error(R.drawable.bg)
.into(feedListRowHolder.thumbView);*/
//SetRecyclerView
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setHasFixedSize(true);
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setAdapter(itemListDataAdapter);
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setNestedScrollingEnabled(false);
}
@Override
public int getItemCount() {
int itemCount = modelSectionHotTrendingNews.size();
return itemCount;
}
public class SectionHotTrendingNewsViewHolder extends RecyclerView.ViewHolder {
protected TextView TVSectionTitle;
protected ImageView BTNHotTrendingNewsMore;
protected RecyclerView RecyclerViewSectionHotTrendingNews;
public SectionHotTrendingNewsViewHolder(View itemView) {
super(itemView);
TVSectionTitle = (TextView) itemView.findViewById(R.id.TV_SectionTitle);
BTNHotTrendingNewsMore= (ImageView) itemView.findViewById(R.id.BTN_HotTrendingNewsMore);
RecyclerViewSectionHotTrendingNews = (RecyclerView) itemView.findViewById(R.id.RecyclerView_Section_HotTrendingNews);
}
}
}
AdapterSingleHotTrendingNews.java
public class AdapterSingleHotTrendingNews extends RecyclerView.Adapter{
private Context mContext;
private ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews;
public AdapterSingleHotTrendingNews(Context mContext, ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews) {
this.mContext = mContext;
this.modelSingleHotTrendingNews = modelSingleHotTrendingNews;
}
//Container
@Override
public SingleHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_single_hottrendingnews, null);
return new SingleHotTrendingNewsViewHolder(v);
}
//Fill Container with Model Setter Getter
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
final SingleHotTrendingNewsViewHolder singleHotTrendingNewsViewHolder = (SingleHotTrendingNewsViewHolder) holder;
final ModelSingleHotTrendingNews modelSingleHotTrendingNewsX = modelSingleHotTrendingNews.get(position);
//Set
singleHotTrendingNewsViewHolder.TVGameDate.setText(modelSingleHotTrendingNewsX.getGamedate());
singleHotTrendingNewsViewHolder.TVGameDescription.setText(modelSingleHotTrendingNewsX.getGamedescription());
singleHotTrendingNewsViewHolder.IMGGameImage.setImageResource(modelSingleHotTrendingNewsX.getGameimage());
singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Boolean booltrendingnewssaving = modelSingleHotTrendingNewsX.getTrendingnewssaving();
final int id = modelSingleHotTrendingNewsX.getId();
if (booltrendingnewssaving == true){
Toast.makeText(v.getContext(), "Turn Off Saved News " + id, Toast.LENGTH_SHORT).show();
singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_off);
modelSingleHotTrendingNewsX.setTrendingnewssaving(false);
/*updateSavedNewsSaving("update_newssaving", id, false);*/
} else if(booltrendingnewssaving == false) {
Toast.makeText(v.getContext(), "Turn On Saved News " + id, Toast.LENGTH_SHORT).show();
singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_on);
modelSingleHotTrendingNewsX.setTrendingnewssaving(true);
/*updateSavedNewsSaving("update_newssaving", id, true);*/
}
}
});
/* Glide.with(mContext)
.load(feedItem.getImageURL())
.diskCacheStrategy(DiskCacheStrategy.ALL)
.centerCrop()
.error(R.drawable.bg)
.into(feedListRowHolder.thumbView);*/
singleHotTrendingNewsViewHolder.ROWHotTrendingNewsContainer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), modelSingleHotTrendingNews.get(position).getGamedescription(), Toast.LENGTH_SHORT).show();
//Passing Data to GameDescriptionActivity
Intent intent = new Intent(mContext, GameDetailActivity.class);
intent.putExtra("ImagePKG", modelSingleHotTrendingNews.get(position).getGameimage());
intent.putExtra("NamePKG", modelSingleHotTrendingNews.get(position).getGamedate());
intent.putExtra("UrlPKG", modelSingleHotTrendingNews.get(position).getId());
intent.putExtra("DescriptionPKG", modelSingleHotTrendingNews.get(position).getGamedescription());
mContext.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
int itemCount = modelSingleHotTrendingNews.size();
return itemCount;
}
public class SingleHotTrendingNewsViewHolder extends RecyclerView.ViewHolder{
TextView TVGameDate;
TextView TVGameDescription;
ImageView IMGGameImage;
ImageView ICONHotTrendingNewsSaving;
private RelativeLayout ROWHotTrendingNewsContainer;
public SingleHotTrendingNewsViewHolder(View itemView) {
super(itemView);
TVGameDate = itemView.findViewById(R.id.TV_GameDate);
TVGameDescription = itemView.findViewById(R.id.TV_GameDescription);
IMGGameImage = itemView.findViewById(R.id.IMG_GameImage);
ICONHotTrendingNewsSaving = itemView.findViewById(R.id.ICON_HotTrendingNewsSaving);
ROWHotTrendingNewsContainer = itemView.findViewById(R.id.ROW_HotTrendingNewsContainer);
}
}
ModelSectionHotTrendingNews.java
public class ModelSectionHotTrendingNews {
private String headerTitle;
private ArrayList<ModelSingleHotTrendingNews> allItemsInSection;
public ModelSectionHotTrendingNews() {
}
public String getHeaderTitle() {
return headerTitle;
}
public void setHeaderTitle(String headerTitle) {
this.headerTitle = headerTitle;
}
public ArrayList<ModelSingleHotTrendingNews> getAllItemsInSection() {
return allItemsInSection;
}
public void setAllItemsInSection(ArrayList<ModelSingleHotTrendingNews> allItemsInSection) {
this.allItemsInSection = allItemsInSection;
}
}
ModelSingleHotTrendingNews.java
public class ModelSingleHotTrendingNews {
private int id;
private String gamedate;
private String gamedescription;
private int gameimage;
private Boolean trendingnewssaving;
private String value;
private String message;
public ModelSingleHotTrendingNews(int id, String gamedate, String gamedescription, int gameimage, Boolean trendingnewssaving, String value, String message) {
this.id = id;
this.gamedate = gamedate;
this.gamedescription = gamedescription;
this.gameimage = gameimage;
this.trendingnewssaving = trendingnewssaving;
this.value = value;
this.message = message;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getGamedate() {
return gamedate;
}
public void setGamedate(String gamedate) {
this.gamedate = gamedate;
}
public String getGamedescription() {
return gamedescription;
}
public void setGamedescription(String gamedescription) {
this.gamedescription = gamedescription;
}
public int getGameimage() {
return gameimage;
}
public void setGameimage(int gameimage) {
this.gameimage = gameimage;
}
public Boolean getTrendingnewssaving() {
return trendingnewssaving;
}
public void setTrendingnewssaving(Boolean trendingnewssaving) {
this.trendingnewssaving = trendingnewssaving;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
片段函数
public void createDummyData1() {
ModelSectionHotTrendingNews modelSectionHotTrendingNewsX = new ModelSectionHotTrendingNews();
modelSectionHotTrendingNewsX.setHeaderTitle("TRENDING NEWS");
ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews = new ArrayList<ModelSingleHotTrendingNews>();
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(1, "20 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(2, "21 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(3, "22 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(4, "23 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(5, "24 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(6, "25 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(7, "26 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSectionHotTrendingNewsX.setAllItemsInSection(modelSingleHotTrendingNews);
modelSectionHotTrendingNews.add(modelSectionHotTrendingNewsX);
}
//更新
我在 SectionAdapterTabHot.java 上添加了这个
我使用相同的模型但不同的 RecyclerView 和适配器，例如：RecyclerViewMoreSection/SingleTabHot 和 Section/SingleMoreAdapterTabHot.java
final String sectionTitle = modelSectionHotTrendingNewsX.getHeaderTitle();
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "click event on more, "+sectionTitle, Toast.LENGTH_SHORT).show();
sectionHotTrendingNewsViewHolder.RecyclerViewMoreSectionHotTrendingNews.setAdapter( new AdapterMoreSingleHotTrendingNews(v.getContext(), modelSectionHotTrendingNews.get(position).getAllItemsInSection()));
Intent intent = new Intent(mContext, TabMoreHotActivity.class);
mContext.startActivity(intent);
}
});
//SectionAdapterViewHolder
public class SectionHotTrendingNewsViewHolder extends RecyclerView.ViewHolder {
protected TextView TVSectionTitle;
protected ImageView BTNHotTrendingNewsMore;
protected RecyclerView RecyclerViewSectionHotTrendingNews;
protected RecyclerView RecyclerViewMoreSectionHotTrendingNews;
public SectionHotTrendingNewsViewHolder(View itemView) {
super(itemView);
TVSectionTitle = (TextView) itemView.findViewById(R.id.TV_SectionTitle);
BTNHotTrendingNewsMore= (ImageView) itemView.findViewById(R.id.BTN_HotTrendingNewsMore);
RecyclerViewSectionHotTrendingNews = (RecyclerView) itemView.findViewById(R.id.RecyclerView_Section_HotTrendingNews);
RecyclerViewMoreSectionHotTrendingNews = (RecyclerView) itemView.findViewById(R.id.RecyclerViewMore_Section_HotTrendingNews);
}
}
//这是我想在 itemmore_hot 中访问 RecyclerViewMoreHotTrendingNews 但在 item_hot
中找不到的问题
@Override
public SectionHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_section_hottrendingnews, null);
return new SectionHotTrendingNewsViewHolder(v);
}
//这是TabMoreHotActivity.java
public class TabMoreHotActivity extends AppCompatActivity {
//1
ArrayList<ModelSectionHotTrendingNews> modelSectionHotTrendingNews = new ArrayList<ModelSectionHotTrendingNews>();
AdapterMoreSectionHotTrendingNews adapterMoreSectionHotTrendingNews;
//ModelData
List<ModelSingleHotTrendingNews> modelSingleHotTrendingNews;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragmentmore_tabhot);
//1
RecyclerView RecyclerViewMoreSingleHotTrendingNews = findViewById(R.id.RecyclerViewMore_Single_HotTrendingNews);
RecyclerViewMoreSingleHotTrendingNews.setHasFixedSize(true);
adapterMoreSectionHotTrendingNews = new AdapterMoreSectionHotTrendingNews(this, modelSectionHotTrendingNews);
RecyclerViewMoreSingleHotTrendingNews.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
RecyclerViewMoreSingleHotTrendingNews.setAdapter(adapterMoreSectionHotTrendingNews);
//Optimized
RecyclerViewMoreSingleHotTrendingNews.setHasFixedSize(true);
RecyclerViewMoreSingleHotTrendingNews.setItemViewCacheSize(20);
}
}
//但是当我点击"See All Item"按钮时出现了这个错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.indofun.android.indojoy, PID: 11456
java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setAdapter(androidx.recyclerview.widget.RecyclerView$Adapter)' on a null object reference
at com.indofun.android.indojoy.Adapters.Adapter_HotTrendingNews.AdapterSectionHotTrendingNews.onClick(AdapterSectionHotTrendingNews.java:88)
at android.view.View.performClick(View.java:6891)
at android.view.View$PerformClick.run(View.java:26083)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
您可以在 Recyclers 父级中创建侦听器。
当来自一个回收器的某些数据将被更改时，在您的父级接收到它之后在当前适配器中触发您的侦听器，并将在第二个回收器适配器中触发一些更新方法。
不过如果能提供一些代码或者更详细的描述肯定会更好
从第一个适配器 onClick，调用第二个适配器并更新 RecyclerView
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setAdapter( new AdapterSingleHotTrendingNews(v.getContext(), modelSectionHotTrendingNews.get(position).getAllItemsInSection()))
}
});
或者，如果您想在另一个 activity 中显示此 更多新闻。然后这样做：
使ModelSingleHotTrendingNewsclassSerializable像这样：
public class ModelSingleHotTrendingNews 实现 Serializable {
...
}
改变onClick
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(新View.OnClickListener() {
@覆盖
public void onClick(View v) {
意图 intent = new Intent(mContext, TabMoreHotActivity.class);
Intent().putExtra("MoreNews", modelSectionHotTrendingNews.get(位置).getAllItemsInSection())
mContext.startActivity（意图）；
}
});
在 TabMoreHotActivity 中使用 ArrayList 而不是 ArrayList<ModelSectionHotTrendingNews>
希望这对您有所帮助。你把你的代码搞得一团糟:(
Q问题
I want to make the
"See All Item"button to pass data from RecyclerView to Another RecyclerView fragment it looks like play store that has the"More"button to see all item in another fragment
AdapterSectionHotTrendingNews.java
public class AdapterSectionHotTrendingNews extends RecyclerView.Adapter{
private Context mContext;
private ArrayList<ModelSectionHotTrendingNews> modelSectionHotTrendingNews;
public AdapterSectionHotTrendingNews(Context mContext, ArrayList<ModelSectionHotTrendingNews> modelSectionHotTrendingNews) {
this.mContext = mContext;
this.modelSectionHotTrendingNews = modelSectionHotTrendingNews;
}
@Override
public SectionHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_section_hottrendingnews, null);
return new SectionHotTrendingNewsViewHolder(v);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
SectionHotTrendingNewsViewHolder sectionHotTrendingNewsViewHolder = (SectionHotTrendingNewsViewHolder) holder;
ModelSectionHotTrendingNews modelSectionHotTrendingNewsX = modelSectionHotTrendingNews.get(position);
//Set
sectionHotTrendingNewsViewHolder.TVSectionTitle.setText(modelSectionHotTrendingNewsX.getHeaderTitle());
ArrayList singleSectionItems = modelSectionHotTrendingNewsX.getAllItemsInSection();
/*AdapterSingleHotLatestNews.RecyclerViewClickListener listenerLatestNews;
listenerLatestNews = new AdapterSingleHotLatestNews.RecyclerViewClickListener() {
@Override
public void onRowHotLatestNewsClick(View view, int position) {
}
@Override
public void onIconHotLatestNewsClick(View view, int position) {
}
};*/
AdapterSingleHotTrendingNews itemListDataAdapter = new AdapterSingleHotTrendingNews(mContext, singleSectionItems);
/*itemRowHolder.recycler_view_list.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// Disallow ScrollView to intercept touch events.
v.getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
//Allow ScrollView to intercept touch events once again.
v.getParent().requestDisallowInterceptTouchEvent(false);
break;
}
// Handle RecyclerView touch events.
v.onTouchEvent(event);
return true;
}
});*/
final String sectionTitle = modelSectionHotTrendingNewsX.getHeaderTitle();
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "click event on more, "+sectionTitle, Toast.LENGTH_SHORT).show();
}
});
/*Glide.with(mContext)
.load(feedItem.getImageURL())
.diskCacheStrategy(DiskCacheStrategy.ALL)
.centerCrop()
.error(R.drawable.bg)
.into(feedListRowHolder.thumbView);*/
//SetRecyclerView
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setHasFixedSize(true);
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setAdapter(itemListDataAdapter);
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setNestedScrollingEnabled(false);
}
@Override
public int getItemCount() {
int itemCount = modelSectionHotTrendingNews.size();
return itemCount;
}
public class SectionHotTrendingNewsViewHolder extends RecyclerView.ViewHolder {
protected TextView TVSectionTitle;
protected ImageView BTNHotTrendingNewsMore;
protected RecyclerView RecyclerViewSectionHotTrendingNews;
public SectionHotTrendingNewsViewHolder(View itemView) {
super(itemView);
TVSectionTitle = (TextView) itemView.findViewById(R.id.TV_SectionTitle);
BTNHotTrendingNewsMore= (ImageView) itemView.findViewById(R.id.BTN_HotTrendingNewsMore);
RecyclerViewSectionHotTrendingNews = (RecyclerView) itemView.findViewById(R.id.RecyclerView_Section_HotTrendingNews);
}
}
}
AdapterSingleHotTrendingNews.java
public class AdapterSingleHotTrendingNews extends RecyclerView.Adapter{
private Context mContext;
private ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews;
public AdapterSingleHotTrendingNews(Context mContext, ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews) {
this.mContext = mContext;
this.modelSingleHotTrendingNews = modelSingleHotTrendingNews;
}
//Container
@Override
public SingleHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_single_hottrendingnews, null);
return new SingleHotTrendingNewsViewHolder(v);
}
//Fill Container with Model Setter Getter
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
final SingleHotTrendingNewsViewHolder singleHotTrendingNewsViewHolder = (SingleHotTrendingNewsViewHolder) holder;
final ModelSingleHotTrendingNews modelSingleHotTrendingNewsX = modelSingleHotTrendingNews.get(position);
//Set
singleHotTrendingNewsViewHolder.TVGameDate.setText(modelSingleHotTrendingNewsX.getGamedate());
singleHotTrendingNewsViewHolder.TVGameDescription.setText(modelSingleHotTrendingNewsX.getGamedescription());
singleHotTrendingNewsViewHolder.IMGGameImage.setImageResource(modelSingleHotTrendingNewsX.getGameimage());
singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Boolean booltrendingnewssaving = modelSingleHotTrendingNewsX.getTrendingnewssaving();
final int id = modelSingleHotTrendingNewsX.getId();
if (booltrendingnewssaving == true){
Toast.makeText(v.getContext(), "Turn Off Saved News " + id, Toast.LENGTH_SHORT).show();
singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_off);
modelSingleHotTrendingNewsX.setTrendingnewssaving(false);
/*updateSavedNewsSaving("update_newssaving", id, false);*/
} else if(booltrendingnewssaving == false) {
Toast.makeText(v.getContext(), "Turn On Saved News " + id, Toast.LENGTH_SHORT).show();
singleHotTrendingNewsViewHolder.ICONHotTrendingNewsSaving.setImageResource(R.drawable.saved_on);
modelSingleHotTrendingNewsX.setTrendingnewssaving(true);
/*updateSavedNewsSaving("update_newssaving", id, true);*/
}
}
});
/* Glide.with(mContext)
.load(feedItem.getImageURL())
.diskCacheStrategy(DiskCacheStrategy.ALL)
.centerCrop()
.error(R.drawable.bg)
.into(feedListRowHolder.thumbView);*/
singleHotTrendingNewsViewHolder.ROWHotTrendingNewsContainer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), modelSingleHotTrendingNews.get(position).getGamedescription(), Toast.LENGTH_SHORT).show();
//Passing Data to GameDescriptionActivity
Intent intent = new Intent(mContext, GameDetailActivity.class);
intent.putExtra("ImagePKG", modelSingleHotTrendingNews.get(position).getGameimage());
intent.putExtra("NamePKG", modelSingleHotTrendingNews.get(position).getGamedate());
intent.putExtra("UrlPKG", modelSingleHotTrendingNews.get(position).getId());
intent.putExtra("DescriptionPKG", modelSingleHotTrendingNews.get(position).getGamedescription());
mContext.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
int itemCount = modelSingleHotTrendingNews.size();
return itemCount;
}
public class SingleHotTrendingNewsViewHolder extends RecyclerView.ViewHolder{
TextView TVGameDate;
TextView TVGameDescription;
ImageView IMGGameImage;
ImageView ICONHotTrendingNewsSaving;
private RelativeLayout ROWHotTrendingNewsContainer;
public SingleHotTrendingNewsViewHolder(View itemView) {
super(itemView);
TVGameDate = itemView.findViewById(R.id.TV_GameDate);
TVGameDescription = itemView.findViewById(R.id.TV_GameDescription);
IMGGameImage = itemView.findViewById(R.id.IMG_GameImage);
ICONHotTrendingNewsSaving = itemView.findViewById(R.id.ICON_HotTrendingNewsSaving);
ROWHotTrendingNewsContainer = itemView.findViewById(R.id.ROW_HotTrendingNewsContainer);
}
}
ModelSectionHotTrendingNews.java
public class ModelSectionHotTrendingNews {
private String headerTitle;
private ArrayList<ModelSingleHotTrendingNews> allItemsInSection;
public ModelSectionHotTrendingNews() {
}
public String getHeaderTitle() {
return headerTitle;
}
public void setHeaderTitle(String headerTitle) {
this.headerTitle = headerTitle;
}
public ArrayList<ModelSingleHotTrendingNews> getAllItemsInSection() {
return allItemsInSection;
}
public void setAllItemsInSection(ArrayList<ModelSingleHotTrendingNews> allItemsInSection) {
this.allItemsInSection = allItemsInSection;
}
}
ModelSingleHotTrendingNews.java
public class ModelSingleHotTrendingNews {
private int id;
private String gamedate;
private String gamedescription;
private int gameimage;
private Boolean trendingnewssaving;
private String value;
private String message;
public ModelSingleHotTrendingNews(int id, String gamedate, String gamedescription, int gameimage, Boolean trendingnewssaving, String value, String message) {
this.id = id;
this.gamedate = gamedate;
this.gamedescription = gamedescription;
this.gameimage = gameimage;
this.trendingnewssaving = trendingnewssaving;
this.value = value;
this.message = message;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getGamedate() {
return gamedate;
}
public void setGamedate(String gamedate) {
this.gamedate = gamedate;
}
public String getGamedescription() {
return gamedescription;
}
public void setGamedescription(String gamedescription) {
this.gamedescription = gamedescription;
}
public int getGameimage() {
return gameimage;
}
public void setGameimage(int gameimage) {
this.gameimage = gameimage;
}
public Boolean getTrendingnewssaving() {
return trendingnewssaving;
}
public void setTrendingnewssaving(Boolean trendingnewssaving) {
this.trendingnewssaving = trendingnewssaving;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
片段函数
public void createDummyData1() {
ModelSectionHotTrendingNews modelSectionHotTrendingNewsX = new ModelSectionHotTrendingNews();
modelSectionHotTrendingNewsX.setHeaderTitle("TRENDING NEWS");
ArrayList<ModelSingleHotTrendingNews> modelSingleHotTrendingNews = new ArrayList<ModelSingleHotTrendingNews>();
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(1, "20 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(2, "21 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(3, "22 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(4, "23 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(5, "24 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(6, "25 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSingleHotTrendingNews.add(new ModelSingleHotTrendingNews(7, "26 Mei 2019", "sdfjiaOIJdosjfsjdfjsoid", R.drawable.kleptocats, false, "x53535", "No Error"));
modelSectionHotTrendingNewsX.setAllItemsInSection(modelSingleHotTrendingNews);
modelSectionHotTrendingNews.add(modelSectionHotTrendingNewsX);
}
//更新 我在 SectionAdapterTabHot.java 上添加了这个 我使用相同的模型但不同的 RecyclerView 和适配器，例如：RecyclerViewMoreSection/SingleTabHot 和 Section/SingleMoreAdapterTabHot.java
final String sectionTitle = modelSectionHotTrendingNewsX.getHeaderTitle();
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "click event on more, "+sectionTitle, Toast.LENGTH_SHORT).show();
sectionHotTrendingNewsViewHolder.RecyclerViewMoreSectionHotTrendingNews.setAdapter( new AdapterMoreSingleHotTrendingNews(v.getContext(), modelSectionHotTrendingNews.get(position).getAllItemsInSection()));
Intent intent = new Intent(mContext, TabMoreHotActivity.class);
mContext.startActivity(intent);
}
});
//SectionAdapterViewHolder
public class SectionHotTrendingNewsViewHolder extends RecyclerView.ViewHolder {
protected TextView TVSectionTitle;
protected ImageView BTNHotTrendingNewsMore;
protected RecyclerView RecyclerViewSectionHotTrendingNews;
protected RecyclerView RecyclerViewMoreSectionHotTrendingNews;
public SectionHotTrendingNewsViewHolder(View itemView) {
super(itemView);
TVSectionTitle = (TextView) itemView.findViewById(R.id.TV_SectionTitle);
BTNHotTrendingNewsMore= (ImageView) itemView.findViewById(R.id.BTN_HotTrendingNewsMore);
RecyclerViewSectionHotTrendingNews = (RecyclerView) itemView.findViewById(R.id.RecyclerView_Section_HotTrendingNews);
RecyclerViewMoreSectionHotTrendingNews = (RecyclerView) itemView.findViewById(R.id.RecyclerViewMore_Section_HotTrendingNews);
}
}
//这是我想在 itemmore_hot 中访问 RecyclerViewMoreHotTrendingNews 但在 item_hot
中找不到的问题@Override
public SectionHotTrendingNewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_section_hottrendingnews, null);
return new SectionHotTrendingNewsViewHolder(v);
}
//这是TabMoreHotActivity.java
public class TabMoreHotActivity extends AppCompatActivity {
//1
ArrayList<ModelSectionHotTrendingNews> modelSectionHotTrendingNews = new ArrayList<ModelSectionHotTrendingNews>();
AdapterMoreSectionHotTrendingNews adapterMoreSectionHotTrendingNews;
//ModelData
List<ModelSingleHotTrendingNews> modelSingleHotTrendingNews;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragmentmore_tabhot);
//1
RecyclerView RecyclerViewMoreSingleHotTrendingNews = findViewById(R.id.RecyclerViewMore_Single_HotTrendingNews);
RecyclerViewMoreSingleHotTrendingNews.setHasFixedSize(true);
adapterMoreSectionHotTrendingNews = new AdapterMoreSectionHotTrendingNews(this, modelSectionHotTrendingNews);
RecyclerViewMoreSingleHotTrendingNews.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
RecyclerViewMoreSingleHotTrendingNews.setAdapter(adapterMoreSectionHotTrendingNews);
//Optimized
RecyclerViewMoreSingleHotTrendingNews.setHasFixedSize(true);
RecyclerViewMoreSingleHotTrendingNews.setItemViewCacheSize(20);
}
}
//但是当我点击"See All Item"按钮时出现了这个错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.indofun.android.indojoy, PID: 11456
java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setAdapter(androidx.recyclerview.widget.RecyclerView$Adapter)' on a null object reference
at com.indofun.android.indojoy.Adapters.Adapter_HotTrendingNews.AdapterSectionHotTrendingNews.onClick(AdapterSectionHotTrendingNews.java:88)
at android.view.View.performClick(View.java:6891)
at android.view.View$PerformClick.run(View.java:26083)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
您可以在 Recyclers 父级中创建侦听器。 当来自一个回收器的某些数据将被更改时，在您的父级接收到它之后在当前适配器中触发您的侦听器，并将在第二个回收器适配器中触发一些更新方法。
不过如果能提供一些代码或者更详细的描述肯定会更好
从第一个适配器 onClick，调用第二个适配器并更新 RecyclerView
sectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sectionHotTrendingNewsViewHolder.RecyclerViewSectionHotTrendingNews.setAdapter( new AdapterSingleHotTrendingNews(v.getContext(), modelSectionHotTrendingNews.get(position).getAllItemsInSection()))
}
});
或者，如果您想在另一个 activity 中显示此 更多新闻。然后这样做：
使
ModelSingleHotTrendingNewsclassSerializable像这样：public class ModelSingleHotTrendingNews 实现 Serializable { ... }
改变
onClicksectionHotTrendingNewsViewHolder.BTNHotTrendingNewsMore.setOnClickListener(新View.OnClickListener() { @覆盖 public void onClick(View v) { 意图 intent = new Intent(mContext, TabMoreHotActivity.class); Intent().putExtra("MoreNews", modelSectionHotTrendingNews.get(位置).getAllItemsInSection()) mContext.startActivity（意图）； } });
在
TabMoreHotActivity中使用 ArrayList 而不是ArrayList<ModelSectionHotTrendingNews>
希望这对您有所帮助。你把你的代码搞得一团糟:(