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我在Fragment中使用RecyclerView來顯示類別列表（如圖所示）。選擇類別時，新的Activity以RecyclerView開頭。列表中的每個項目都有一個TextView和一個收藏圖標（右上角的星號）。一旦按下收藏夾圖標，TextView將被保存到另一個名爲收藏夾的Activity。帶有多個適配器和SharedPreferences的RecyclerView
問題：讓我們說，我選擇A類，我按下喜歡按鈕第2項。一切看起來不錯，物品保存到收藏夾。如果我選擇B類，bamm，我發現前2項選擇...我去類別C，同樣的事情！ 因此，如果我檢查收藏按鈕一次，它會檢查所有Adapters，就像他們正在溝通。這是爲什麼發生？
雖然收藏夾按鈕進行檢查，我無法從B類或Ç在收藏夾找到TextView的活動。
當一個類別的項目選擇了開始的Activity：
public class CategoriesDetailActivity extends AppCompatActivity {
Adapter0 ca0;
RecyclerView recList;
public CategoriesDetailActivity() {
// Required empty public constructor
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.categories_detail_activity);
Bundle bundle = this.getIntent().getExtras();
// Bundle bundle = this.getArguments();
bundle.getInt("id");
int position = bundle.getInt("id");
if (bundle.containsKey("id")) {
position = bundle.getInt("id");
} else {
this.finish();
}
recList = (RecyclerView) findViewById(R.id.cardList);
recList.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(this);
llm.setOrientation(LinearLayoutManager.VERTICAL);
recList.setLayoutManager(llm);
switch (position) {
case 0:
ca0 = new Adapter0(this, createList0(99));
recList.setAdapter(ca0);
break;
case 1:
ca0 = new Adapter0(this, createList1(80));
recList.setAdapter(ca0);
break;
...
}
}
private List<BeanSampleList> createList0(int size) {
List<BeanSampleList> result = new ArrayList<>();
for (int i = 0; i <= size; i++) {
BeanSampleList ci = new BeanSampleList();
ci.title = DataText.Text1[i];
ci.id = i;
result.add(ci);
}
return result;
}
private List<BeanSampleList> createList1(int size) {
List<BeanSampleList> result = new ArrayList<>();
for (int i = 0; i <= size; i++) {
BeanSampleList ci = new BeanSampleList();
ci.title = DataText.Text2[i];
ci.id = i;
result.add(ci);
}
return result;
}
@Override
public void onResume() {
super.onResume();
if (recList.getAdapter() == ca0) {
ca0.notifyDataSetChanged();
} if (recList.getAdapter() == ca1) {
ca1.notifyDataSetChanged();
} else {
// nothing
}
}
}
的Adapter類：
public class Adapter0 extends RecyclerView.Adapter<Adapter0 .ContactViewHolder> {
private Context context;
List<BeanSampleList> postBeanSampleList;
SharedPreference sharedPreference;
BeanSampleList beanSampleList;
public Adapter0 (Context context, List<BeanSampleList> postBeanSampleList) {
this.context = context;
this.postBeanSampleList = postBeanSampleList;
sharedPreference = new SharedPreference();
}
@Override
public int getItemCount() {
return postBeanSampleList.size();
}
public Object getItem(int position) {
return postBeanSampleList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public void onBindViewHolder(final ContactViewHolder holder,final int i) {
beanSampleList = (BeanSampleList) getItem(i);
holder.vName.setText(beanSampleList.getTitle());
if (checkFavoriteItem(beanSampleList)) {
holder.btnFavourite.setLiked(true);
holder.btnFavourite.setTag("active");
} else {
holder.btnFavourite.setLiked(false);
holder.btnFavourite.setTag("deactive");
}
}
@Override
public ContactViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.categories_detail_adapter, viewGroup, false);
return new ContactViewHolder(itemView);
}
public class ContactViewHolder extends RecyclerView.ViewHolder implements OnLikeListener {
protected TextView vName;
protected LikeButton btnFavourite;
public ContactViewHolder(View v) {
super(v);
vName = (TextView) v.findViewById(R.id.t1);
btnFavourite = (LikeButton) v.findViewById(R.id.favouritesToggle);
btnFavourite.setOnLikeListener(this);
}
@Override
public void liked(LikeButton likeButton) {
final int position = getAdapterPosition();
if (likeButton.getId() == btnFavourite.getId()) {
String tag = btnFavourite.getTag().toString();
if (tag.equalsIgnoreCase("deactive")) {
sharedPreference.addFavorite(context, postBeanSampleList.get(position));
btnFavourite.setTag("active");
btnFavourite.setLiked(true);
}
Snackbar snackbar = Snackbar
.make(likeButton, "Added to Favorites!", Snackbar.LENGTH_SHORT);
snackbar.show();
}
}
@Override
public void unLiked(LikeButton likeButton) {
final int position = getAdapterPosition();
if (likeButton.getId() == btnFavourite.getId()) {
sharedPreference.removeFavorite(context, postBeanSampleList.get(position));
btnFavourite.setTag("deactive");
btnFavourite.setLiked(false);
Snackbar snackbar = Snackbar
.make(likeButton, "Removed from Favorites!", Snackbar.LENGTH_SHORT);
snackbar.show();
}
}
}
public boolean checkFavoriteItem(BeanSampleList checkProduct) {
boolean check = false;
List<BeanSampleList> favorites = sharedPreference.loadFavorites(context);
if (favorites != null) {
for (BeanSampleList product : favorites) {
if (product.equals(checkProduct)) {
check = true;
break;
}
}
}
return check;
}
}
對於最近兩天我一直在試圖解決這一問題，但我不能不知道是什麼原因造成的。我也嘗試爲每個位置使用不同的Adapters，但沒有成功。
public class BeanSampleList {
public int id;
public String title;
public String subTitle;
public String bottomTitle;
public String imageView;
public BeanSampleList() {
super();
}
public BeanSampleList(int id, String title, String subTitle, String bottomTitle, String imageView) {
super();
this.id = id;
this.title = title;
this.subTitle = subTitle;
this.bottomTitle = bottomTitle;
this.imageView = imageView;
}
public String getSubTitle() {
return subTitle;
}
public void setSubTitle(String subTitle) {
this.subTitle = subTitle;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getTitleBottom() {
return bottomTitle;
}
public void setTitleBottom(String bottomTitle) {
this.bottomTitle = bottomTitle;
}
public String getImageView() {
return imageView;
}
public void setImageView(String imageView) {
this.imageView = imageView;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
BeanSampleList other = (BeanSampleList) obj;
if (id != other.id)
return false;
return true;
}
}
非常感謝你和我的英語對不起。
我認爲你在所有商品視圖中訪問和綁定同一商店最喜歡的值。 – Inducesmile