请帮忙！我有recycleview搜索功能（基于JSON搜索）。我想点击这个recycleview（表示在项目视图中显示项目的ID），然后PutExtra此ID到另一个活动。然后另一个活动获得ID。最后另一个活动发布ID并获取价值！
这是我的代码，有人告诉我的错误:)：
AdapterFish.java
public class AdapterFish extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private LayoutInflater inflater;
List<DataFish> data= Collections.emptyList();
DataFish current;
int currentPos=0;
public String IDHOLDER;
private Context activity;
// create constructor to initialize context and data sent from MainActivity
public AdapterFish(Context context, List<DataFish> data){
this.context=context;
inflater= LayoutInflater.from(context);
this.data=data;
}
// Inflate the layout when ViewHolder created
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.container_fish, parent,false);
MyHolder holder=new MyHolder(view);
return holder;
}
// Bind data
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Get current position of item in RecyclerView to bind data and assign values from list
MyHolder myHolder= (MyHolder) holder;
DataFish current=data.get(position);
myHolder.company.setText(current.company);
myHolder.name.setText(current.name);
myHolder.family.setText(current.family);
myHolder.id.setText(current.id);
myHolder.id.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
}
// return total item from List
@Override
public int getItemCount() {
return data.size();
}
public Context getActivity() {
return activity;
}
public void setActivity(Context activity) {
this.activity = activity;
}
class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView company;
TextView name;
TextView family;
TextView id;
// create constructor to get widget reference
public MyHolder(View itemView) {
super(itemView);
company= (TextView) itemView.findViewById(R.id.company);
name = (TextView) itemView.findViewById(R.id.name);
family = (TextView) itemView.findViewById(R.id.family);
id = (TextView) itemView.findViewById(R.id.id);
itemView.setOnClickListener(this);
}
// Click event for all items
@Override
public void onClick(View v) {
Toast.makeText(context, "You clicked an item", Toast.LENGTH_SHORT).show();
final String ItemId = id.getText().toString().trim();
Intent intent = new Intent(context, ShowSingleRecordActivity.class);
intent.putExtra("ID", ItemId);
context.startActivity(intent);
}
}}
ShowSingleRecordActivity.java（接收ID）
public class ShowSingleRecordActivity extends AppCompatActivity {
HttpParse httpParse = new HttpParse();
ProgressDialog pDialog;
// Http Url For Filter Student Data from Id Sent from previous activity.
String HttpURL = "http://192.168.137.1/namayeshgah/FilterStudentData.php";
// Http URL for delete Already Open Student Record.
String HttpUrlDeleteRecord = "http://192.168.137.1/namayeshgah/DeleteStudent.php";
String finalResult ;
HashMap<String,String> hashMap = new HashMap<>();
String ParseResult ;
HashMap<String,String> ResultHash = new HashMap<>();
String FinalJSonObject ;
TextView COMPANY,NAME,FAMILY,GENDER,EMAIL1,EMAIL2,PHONE,FAX,TELLFAX,MOBILE;
String CompanyHolder ,NameHolder,FamilyHolder,GenderHolder,Email1Holder,Email2Holder,PhoneHolder,FaxHolder,TellfaxHolder,MobileHolder;
Button UpdateButton, DeleteButton;
String TempItem;
ProgressDialog progressDialog2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_single_record);
COMPANY = (TextView)findViewById(R.id.ncompany);
NAME = (TextView)findViewById(R.id.nname);
FAMILY=(TextView)findViewById(R.id.nfamily);
GENDER =(TextView)findViewById(R.id.ngender);
EMAIL1= (TextView)findViewById(R.id.nemail1);
EMAIL2= (TextView)findViewById(R.id.nemail2);
PHONE= (TextView)findViewById(R.id.nphone);
FAX = (TextView)findViewById(R.id.nfax);
TELLFAX = (TextView)findViewById(R.id.ntellfax);
MOBILE = (TextView)findViewById(R.id.nmobile);
UpdateButton = (Button)findViewById(R.id.buttonUpdate);
DeleteButton = (Button)findViewById(R.id.buttonDelete);
//Receiving the ListView Clicked item value send by previous activity.
TempItem = getIntent().getStringExtra("ID");
//Calling method to filter Student Record and open selected record.
HttpWebCall(TempItem);
UpdateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(ShowSingleRecordActivity.this,UpdateActivity.class);
// Sending Student Id, Name, Number and Class to next UpdateActivity.
intent.putExtra("Id", TempItem);
intent.putExtra("company",CompanyHolder );
intent.putExtra("name", NameHolder);
intent.putExtra("family",FamilyHolder );
intent.putExtra("gender",GenderHolder );
intent.putExtra("email1",Email1Holder );
intent.putExtra("email2",Email2Holder );
intent.putExtra("phone",PhoneHolder );
intent.putExtra("fax",FaxHolder );
intent.putExtra("tellfax",TellfaxHolder );
intent.putExtra("mobile",MobileHolder );
startActivity(intent);
// Finishing current activity after opening next activity.
finish();
}
});
// Add Click listener on Delete button.
DeleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Calling Student delete method to delete current record using Student ID.
StudentDelete(TempItem);
}
});
}
// Method to Delete Student Record
public void StudentDelete(final String StudentID) {
class StudentDeleteClass extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog2 = ProgressDialog.show(ShowSingleRecordActivity.this, "Loading Data", null, true, true);
}
@Override
protected void onPostExecute(String httpResponseMsg) {
super.onPostExecute(httpResponseMsg);
progressDialog2.dismiss();
Toast.makeText(ShowSingleRecordActivity.this, httpResponseMsg.toString(), Toast.LENGTH_LONG).show();
finish();
}
@Override
protected String doInBackground(String... params) {
// Sending STUDENT id.
hashMap.put("StudentID", params[0]);
finalResult = httpParse.postRequest(hashMap, HttpUrlDeleteRecord);
return finalResult;
}
}
StudentDeleteClass studentDeleteClass = new StudentDeleteClass();
studentDeleteClass.execute(StudentID);
}
//Method to show current record Current Selected Record
public void HttpWebCall(final String PreviousListViewClickedItem){
class HttpWebCallFunction extends AsyncTask<String,Void,String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = ProgressDialog.show(ShowSingleRecordActivity.this,"Loading Data",null,true,true);
}
@Override
protected void onPostExecute(String httpResponseMsg) {
super.onPostExecute(httpResponseMsg);
pDialog.dismiss();
//Storing Complete JSon Object into String Variable.
FinalJSonObject = httpResponseMsg ;
//Parsing the Stored JSOn String to GetHttpResponse Method.
new GetHttpResponse(ShowSingleRecordActivity.this).execute();
}
@Override
protected String doInBackground(String... params) {
ResultHash.put("StudentID",params[0]);
ParseResult = httpParse.postRequest(ResultHash, HttpURL);
return ParseResult;
}
}
HttpWebCallFunction httpWebCallFunction = new HttpWebCallFunction();
httpWebCallFunction.execute(PreviousListViewClickedItem);
}
// Parsing Complete JSON Object.
private class GetHttpResponse extends AsyncTask<Void, Void, Void>
{
public Context context;
public GetHttpResponse(Context context)
{
this.context = context;
}
@Override
protected void onPreExecute()
{
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... arg0)
{
try
{
if(FinalJSonObject != null)
{
JSONArray jsonArray = null;
try {
jsonArray = new JSONArray(FinalJSonObject);
JSONObject jsonObject;
for(int i=0; i<jsonArray.length(); i++)
{
jsonObject = jsonArray.getJSONObject(i);
// Storing Student Name, Phone Number, Class into Variables.
CompanyHolder = jsonObject.getString("company");
NameHolder = jsonObject.getString("name");
FamilyHolder= jsonObject.getString("family");
GenderHolder= jsonObject.getString("gender");
Email1Holder = jsonObject.getString("email1");
Email2Holder = jsonObject.getString("email2");
PhoneHolder = jsonObject.getString("phone");
FaxHolder = jsonObject.getString("fax");
TellfaxHolder = jsonObject.getString("tellfax");
MobileHolder = jsonObject.getString("mobile");
}
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result)
{
// Setting Student Name, Phone Number, Class into TextView after done all process .
COMPANY.setText(CompanyHolder);
NAME.setText(NameHolder);
FAMILY.setText(FamilyHolder);
GENDER.setText(GenderHolder);
EMAIL1.setText(Email1Holder);
EMAIL2.setText(Email2Holder);
PHONE.setText(PhoneHolder);
FAX.setText(FaxHolder);
TELLFAX.setText(TellfaxHolder);
MOBILE.setText(MobileHolder);
}
}
和Searching.java
public class searching extends AppCompatActivity {
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVFish;
private AdapterFish mAdapter;
SearchView searchView = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.searching);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// adds item to action bar
getMenuInflater().inflate(R.menu.search_main, menu);
// Get Search item from action bar and Get Search service
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchManager searchManager = (SearchManager) searching.this.getSystemService(Context.SEARCH_SERVICE);
if (searchItem != null) {
searchView = (SearchView) searchItem.getActionView();
}
if (searchView != null) {
searchView.setSearchableInfo(searchManager.getSearchableInfo(searching.this.getComponentName()));
searchView.setIconified(false);
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
// Every time when you press search button on keypad an Activity is recreated which in turn calls this function
@Override
protected void onNewIntent(Intent intent) {
// Get search query and create object of class AsyncFetch
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
if (searchView != null) {
searchView.clearFocus();
}
new AsyncFetch(query).execute();
}
}
// Create class AsyncFetch
private class AsyncFetch extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(searching.this);
HttpURLConnection conn;
URL url = null;
String searchQuery;
public AsyncFetch(String searchQuery){
this.searchQuery=searchQuery;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your php file resides
url = new URL("http://192.168.137.1/namayeshgah/search/fish-search.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoInput and setDoOutput to true as we send and recieve data
conn.setDoInput(true);
conn.setDoOutput(true);
// add parameter to our above url
Uri.Builder builder = new Uri.Builder().appendQueryParameter("searchQuery", searchQuery);
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return("Connection error");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
List<DataFish> data=new ArrayList<>();
pdLoading.dismiss();
if(result.equals("no rows")) {
Toast.makeText(searching.this, "No Results found for entered query", Toast.LENGTH_LONG).show();
}else{
try {
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
DataFish fishData = new DataFish();
fishData.company = json_data.getString("company");
fishData.name = json_data.getString("name");
fishData.family = json_data.getString("family");
fishData.id = json_data.getString("id");
data.add(fishData);
}
// Setup and Handover data to recyclerview
mRVFish = (RecyclerView) findViewById(R.id.fishPriceList);
mAdapter = new AdapterFish(searching.this, data);
mRVFish.setAdapter(mAdapter);
mRVFish.setLayoutManager(new LinearLayoutManager(searching.this));
} catch (JSONException e) {
// You to understand what actually error is and handle it appropriately
Toast.makeText(searching.this, e.toString(), Toast.LENGTH_LONG).show();
Toast.makeText(searching.this, result.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
答案 0 :(得分：0)
试试这个
@Override
public void onClick(View v) {
DataFish newCurrent=data.get(getAdapterPosition());
Toast.makeText(context, "You clicked an item", Toast.LENGTH_SHORT).show();
final String ItemId = newCurrent.id;
Intent intent = new Intent(context, ShowSingleRecordActivity.class);
intent.putExtra("ID", ItemId);
context.startActivity(intent);
}
答案 1 :(得分：0)
尝试使用以下代码，以便它可以正常工作。
const onLoadMoreClick = e => {
e.preventDefault(); // this prevents the navigation normally occuring with an <a> element
this.loadMore(this.state.skip);
}
ShowSingleRecordActivity.java（接收ID）
public class AdapterFish extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private LayoutInflater inflater;
List<DataFish> data= Collections.emptyList();
DataFish current;
int currentPos=0;
public String IDHOLDER;
private Context activity;
// create constructor to initialize context and data sent from MainActivity
public AdapterFish(Context context, List<DataFish> data){
this.context=context;
inflater= LayoutInflater.from(context);
this.data=data;
}
// Inflate the layout when ViewHolder created
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.container_fish, parent,false);
MyHolder holder=new MyHolder(view);
return holder;
}
// Bind data
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Get current position of item in RecyclerView to bind data and assign values from list
MyHolder myHolder= (MyHolder) holder;
DataFish current=data.get(position);
myHolder.company.setText(current.company);
myHolder.name.setText(current.name);
myHolder.family.setText(current.family);
myHolder.id.setText(current.id);
myHolder.id.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
((MyHolder ) holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "You clicked an item", Toast.LENGTH_SHORT).show();
//final String ItemId = id.getText().toString().trim();
Intent intent = new Intent(context, ShowSingleRecordActivity.class);
intent.putExtra("ID", current.id);
context.startActivity(intent);
}
});
}
// return total item from List
@Override
public int getItemCount() {
return data.size();
}
public Context getActivity() {
return activity;
}
public void setActivity(Context activity) {
this.activity = activity;
}
class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView company;
TextView name;
TextView family;
TextView id;
// create constructor to get widget reference
public MyHolder(View itemView) {
super(itemView);
company= (TextView) itemView.findViewById(R.id.company);
name = (TextView) itemView.findViewById(R.id.name);
family = (TextView) itemView.findViewById(R.id.family);
id = (TextView) itemView.findViewById(R.id.id);
itemView.setOnClickListener(this);
}
// Click event for all items
@Override
public void onClick(View v) {
}
}}
答案 2 :(得分：0)
希望这会有效......但究竟是什么问题？是检测点击的值还是将ID传递给新的活动？
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Get current position of item in RecyclerView to bind data and assign values from list
MyHolder myHolder= (MyHolder) holder;
DataFish current=data.get(position);
myHolder.setTag(current); //<--added
myHolder.company.setText(current.company);
myHolder.name.setText(current.name);
myHolder.family.setText(current.family);
myHolder.id.setText(current.id);
myHolder.id.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
((MyHolder ) holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "You clicked an item", Toast.LENGTH_SHORT).show();
DataFish clickedData = (DataFish) v.getTag(); //<-- pull data from tag
Intent intent = new Intent(context, ShowSingleRecordActivity.class);
intent.putExtra("ID", clickedData.id);
context.startActivity(intent);
}
});
}
答案 3 :(得分：0)
在 ShowSingleRecordActivity
中替换此行TempItem = getIntent().getStringExtra("ID");
到
TempItem = getIntent().getExtras().getString("ID");