【发布时间】：2018-02-12 02:31:09
【问题描述】：
我有一个 CardView 项目的 RecyclerView 列表。然后，我使用带有 SearchView 小部件的简单过滤器方法来过滤列表。然后，当我单击过滤后的 CardView 以启动 CardViewDetails 活动时，UI 显示的是原始列表中的 CardView，而不是过滤后的列表。例如，我在原始列表中有一个包含 20 个项目的列表。当我输入搜索约束时，过滤后的列表在 RecyclerView 中正确显示了三个 CardView。当我单击 List 中的第三个 CardView 时，UI 从原始 List 中返回第三个 CardView，而不是从过滤后的 List 中返回第三个 CardView。我在这里错过了什么？
Adapter:
public class MyRecylerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<ListItem> mListItems, filteredList;
Context mContext;
private RecyclerItemClickListener recyclerItemClickListener;
private RecyclerView mRecyclerView;
/**********************************************************/
private String searchString = "";
/**********************************************************/
public MyRecylerAdapter(Context context, List<ListItem> listItems) {
this.mContext = context;
this.mListItems = listItems;
this.filteredList = new ArrayList<>();
this.filteredList.addAll(this.mListItems);
}
// RecyclerItemClickListener is the public interface file used to reach the MainActivity
public void setOnItemClickListener(RecyclerItemClickListener recyclerItemClickListener) {
this.recyclerItemClickListener = recyclerItemClickListener;
}
// Get the Item's position.
public ListItem getItem(int position) {
return filteredList.get(position);
}
@Override
public int getItemCount() {
if (filteredList.size() >0) {
return filteredList.size();
}
else {
return mListItems.size();
}
}
public void setFilter(List<ListItem> listItems, String searchString) {
// Note: the String is to get s.toString() from the Main Activity SearchView.
filteredList = new ArrayList<>();
filteredList.addAll(listItems);
this.searchString = searchString;
notifyDataSetChanged();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_contact_item, parent, false);
final ItemHolder itemHolder = new ItemHolder(view);
// Attach a Click listener to the items's (row) view.
// itemView is from the ItemHolder() below.
// onItemClick is the click method in MainActivity.
itemHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int adapterPos = itemHolder.getAdapterPosition(); // get the item position.
if (adapterPos != RecyclerView.NO_POSITION) {
if (recyclerItemClickListener != null) {
// pass the item to the Main Activity
// through the RecyclerItemClickListener file and its
// public interface.
recyclerItemClickListener.onItemClick(itemHolder.itemView,adapterPos);
}
}
}
});
return itemHolder;
}
private static class ItemHolder extends RecyclerView.ViewHolder {
private TextView cardBlankText2;
private ItemHolder(View itemView) {
super(itemView);
cardBlankText2 = (TextView) itemView.findViewById(R.id.cardBlankText2);
}
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
final ListItem listItem = filteredList.get(position);
final ItemHolder itemHolder = (ItemHolder) holder;
itemHolder.cardBlankText2.setText(listItem.getTodo());
}
Activity:
public class MainActivity extends AppCompatActivity implements
RecyclerItemClickListener {
private List<ListItem> allList = new ArrayList<>();
private RecyclerView mRecyclerView;
private SQLiteDB sqLiteDB;
private MyRecylerAdapter adapter;
private CardView cardview;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sqLiteDB = SQLiteDB.getInstance(this);
mRecyclerView = (RecyclerView)findViewById(R.id.list_recyclerview);
final LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
mRecyclerView.setLayoutManager(layoutManager);
allList = sqLiteDB.getAllDBItems();
adapter = new MyRecylerAdapter(this, allList);
adapter.setOnItemClickListener(this);
mRecyclerView.setAdapter(adapter);
}
@Override
public void onItemClick(View view, int position) {
cardview = (CardView) view;
cardview.setEnabled(false);
// Create a new intent to send data from this MainActivity to the CardViewDetails
// Activity.
Intent intent = new Intent(this,CardViewDetails.class);
ListItem listItem = adapter.getItem(position);
// Add the item object to the Intent. The item object can be used because the
// model class implements Parcelable so it holds all of the getters
// that can be snagged in the next Activity with the
// getParcelableExtra method.
intent.putExtra("item",listItem);
intent.putExtra("position",position);
startActivity(intent);
finish();
}
// SearchView
final EditText mSearchEditText = (EditText) mSearchView.findViewById(android.support.v7.appcompat.R.id.search_src_text);
mSearchEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
final ArrayList<ListItem> filteredModelList = filter(allList, s.toString());
if (!mSearchView.isIconified() && filteredModelList.size() == 0) {
Toast.makeText(MainActivity.this, "Not Found", Toast.LENGTH_SHORT).show();
// re-load the list so the Adapter refreshes the RecyclerView list View.
adapter.clear();
adapter.addAll(allList);
} else if (!mSearchView.isIconified() && filteredModelList.size() > 0) {
adapter.setFilter(filteredModelList, s.toString());
mRecyclerView.scrollToPosition(0);
}
}
}
});
private ArrayList<ListItem> filter(List<ListItem> models, String query) {
query = query.toLowerCase();
final ArrayList<ListItem> filteredModelList = new ArrayList<>();
for (ListItem listItem : models) {
final String text = listItem.getTodo().toLowerCase();
final String text2 = listItem.getNote1().toLowerCase();
final String text3 = listItem.getNote2().toLowerCase();
if (text.contains(query) || text2.contains(query) ||
text3.contains(query)) {
filteredModelList.add(listItem);
}
}
return filteredModelList;
}
RecyclerItemClickListener:
public interface RecyclerItemClickListener {
void onItemClick(View view, int position);
}
CardViewDetails:
public class CardViewDetails extends AppCompatActivity {
private int position;
private SQLiteDB helper;
List<ListItem> listItems;
private CardView cardview;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);
final CardView cardView = (CardView) findViewById(R.id.dets);
// Create a variable for the skychill footer text.
final TextView skychilltext5;
// A db helper instance is needed for the removeItem() below
// when the user Longclicks the skycard for deletion.
helper = new SQLiteDB(this);
// Get the position of the clicked on R. list CardView from
// the MainActivity's intent bundle.
Bundle extras = getIntent().getExtras();
if (extras != null) {
// get the CardView item using the int position from the
// MainActivity's onItemClick() and the putExtra in the intent.
position = extras.getInt("position",0); // 0 is default value
}
cb2 = (TextView) findViewById(R.id.cb2);
helper = new SQLiteDB(this);
listItems = new ArrayList<>();
listItems = helper.getAllDBItems();
cb2.setText(listItems.get(position).getTodo());
...
}
【问题讨论】：
-
当将点击事件传递给 MainActivity 时，MainActivity 可能仍然使用“旧的”未过滤列表而不是过滤列表来确定要操作的项目？
-
@Ascorbin 可能是这样。我被困在如何解决问题上。有什么想法吗？
-
可能有，如果您发布 MainActivity 的相关部分;)
-
我发布了 MainActivity 的 onCreate 和 onItemClick 方法。我可以添加 Model 类和 DetailsActivity。
-
我怀疑，在 viewHolder 上设置 clickListener 时，使用 getAdapterPosition 检索位置并不是您想要的。可以尝试在 onBindViewHolder 中设置 clickListener 并使用 onBindViewHolder 方法参数的位置而不是使用 getAdapterPosition 吗？
标签： android android-recyclerview onclicklistener