我使用onQueryTextChange方法过滤我的recyclerview数据，过滤器工作正常，但是当我在过滤器后点击一个元素时，它仍然会拾取放在过滤器之前的元素。有人可以指出我在这里做错了什么。
MainActivity.java
public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener
{
List<DataAdapter> DataAdapterClassList;
RecyclerView recyclerView;
EditText etSearch;
RecyclerView.LayoutManager recyclerViewlayoutManager;
RecyclerViewAdapter recyclerViewadapter;
ProgressBar progressBar;
JsonArrayRequest jsonArrayRequest;
ArrayList<String> BankNames;
RequestQueue requestQueue;
String HTTP_SERVER_URL = "http://hiddenforsecurity.com?method=apiTest";
View ChildView;
int RecyclerViewClickedItemPOS;
LinearLayout lyt, icicBtn, hdfcBtn, axisBtn, sbiBtn, pnbBtn, yesBtn;
private static int firstVisibleInListview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DataAdapterClassList = new ArrayList<>();
BankNames = new ArrayList<>();
recyclerView = (RecyclerView) findViewById(R.id.recyclerView1);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
recyclerView.setHasFixedSize(true);
recyclerViewlayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(recyclerViewlayoutManager);
lyt = (LinearLayout) findViewById(R.id.Layout1);
final Intent go = new Intent(MainActivity.this, StateList.class);
icicBtn = (LinearLayout) findViewById(R.id.icicBtn);
hdfcBtn = (LinearLayout) findViewById(R.id.hdfcBtn);
axisBtn = (LinearLayout) findViewById(R.id.axisBtn);
sbiBtn = (LinearLayout) findViewById(R.id.sbiBtn);
pnbBtn = (LinearLayout) findViewById(R.id.pnbBtn);
yesBtn = (LinearLayout) findViewById(R.id.yesBtn);
final Intent i = new Intent(this, StateList.class);
// JSON data web call function call from here.
JSON_WEB_CALL();
//RecyclerView Item click listener code starts from here.
recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
GestureDetector gestureDetector = new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent motionEvent) {
return true;
}
});
@Override
public boolean onInterceptTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {
ChildView = Recyclerview.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
if (ChildView != null && gestureDetector.onTouchEvent(motionEvent)) {
//Getting RecyclerView Clicked item value.
RecyclerViewClickedItemPOS = Recyclerview.getChildAdapterPosition(ChildView);
Toast.makeText(MainActivity.this, BankNames.get(RecyclerViewClickedItemPOS), Toast.LENGTH_SHORT).show();
//Printing RecyclerView Clicked item clicked value using Toast Message.
//i.putExtra("selectedbank", BankNames.get(RecyclerViewClickedItemPOS));
//startActivity(i);
}
return false;
}
@Override
public void onTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
icicBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
go.putExtra("selectedbank", "ICICI BANK LIMITED");
startActivity(go);
}
});
axisBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
go.putExtra("selectedbank", "AXIS BANK");
startActivity(go);
}
});
hdfcBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
go.putExtra("selectedbank", "HDFC BANK");
startActivity(go);
}
});
sbiBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
go.putExtra("selectedbank", "STATE BANK OF INDIA");
startActivity(go);
}
});
pnbBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
go.putExtra("selectedbank", "PUNJAB NATIONAL BANK");
startActivity(go);
}
});
yesBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
go.putExtra("selectedbank", "YES BANK");
startActivity(go);
}
});
}
public void JSON_WEB_CALL(){
progressBar.setVisibility(View.VISIBLE);
jsonArrayRequest = new JsonArrayRequest(HTTP_SERVER_URL,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
JSON_PARSE_DATA_AFTER_WEBCALL(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
public void JSON_PARSE_DATA_AFTER_WEBCALL(JSONArray array){
for(int i = 0; i<array.length(); i++) {
DataAdapter GetDataAdapter2 = new DataAdapter();
JSONObject json = null;
try {
json = array.getJSONObject(i);
GetDataAdapter2.setBankName(json.getString("BANK"));
//Adding subject name here to show on click event.
BankNames.add(json.getString("BANK"));
}
catch (JSONException e)
{
e.printStackTrace();
}
DataAdapterClassList.add(GetDataAdapter2);
}
progressBar.setVisibility(View.GONE);
recyclerViewadapter = new RecyclerViewAdapter(DataAdapterClassList, this);
recyclerView.setAdapter(recyclerViewadapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_search, menu);
MenuItem item = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
final List<DataAdapter> filteredModelList = filter(DataAdapterClassList, newText);
if (filteredModelList.size() > 0) {
recyclerViewadapter.setFilter(filteredModelList);
return true;
} else {
Toast.makeText(MainActivity.this, "Not Found", Toast.LENGTH_SHORT).show();
return false;
}
}
private List<DataAdapter> filter(List<DataAdapter> models, String query) {
query = query.toLowerCase();
final List<DataAdapter> filteredModelList = new ArrayList<>();
for (DataAdapter model : models) {
final String text = model.getBankName().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
recyclerViewadapter = new RecyclerViewAdapter(filteredModelList, MainActivity.this);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
recyclerView.setAdapter(recyclerViewadapter);
recyclerViewadapter.notifyDataSetChanged();
return filteredModelList;
}
}
RecyclerviewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
Context context;
public DataAdapter dataAdapter;
List<DataAdapter> dataAdapters;
public RecyclerViewAdapter(List<DataAdapter> getDataAdapter, Context context){
super();
this.dataAdapters = getDataAdapter;
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
dataAdapter = dataAdapters.get(position);
viewHolder.TextViewName.setText(dataAdapter.getBankName());
}
@Override
public int getItemCount() {
return dataAdapters.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView TextViewName;
public ViewHolder(View itemView) {
super(itemView);
TextViewName = (TextView) itemView.findViewById(R.id.TextViewCard) ;
}
}
public void setFilter(List<DataAdapter> bankNames) {
dataAdapters = new ArrayList<>();
dataAdapters.addAll(bankNames);
notifyDataSetChanged();
}
}
请查看这些屏幕截图，以便更好地了解我的查询。
当我在过滤前点击某个项目时，Toast会显示正确的数据。 Unfiltered Screenshot
当我在过滤后点击某个项目时，Toast仍然显示上面屏幕截图中的数据，它应该显示HDFC BANK。Filtered Screenshot
答案 0 :(得分：0)
这是因为您要在列表视图中更改数据集，但稍后在Toast中更改为BankNames，这是不同的数据集。
在您的示例列表中，由于过滤器而导致ony 1元素。当您单击它时，单击的索引实际上将为0，而不是您需要的x，稍后您将从BankNames中选择0索引库而不是从筛选结果集中选择。
为了解决问题，请使用相同的数据集进行列表视图和数据提取。
您只需创建包含当前已过滤结果的filteredBankNames集合，然后将其传递到列表视图即可。同时，在点击事件中，从filteredBankNames中挑选银行名称以及BankNames
例如：
// make this not final local variable, but a field in activity so you can remember filtered items
final List<DataAdapter> filteredModelList = filter(DataAdapterClassList, newText);
if (filteredModelList.size() > 0) {
recyclerViewadapter.setFilter(filteredModelList);
return true;
} else {
和Toast
Toast.makeText(MainActivity.this, filteredModelList.get(RecyclerViewClickedItemPOS), Toast.LENGTH_SHORT).show();