我正在尝试从RecyclerView的数据库中获取下拉列表项，但是每当我尝试加载recyclerView Activity时，应用程序就会崩溃。
代码形成我的RecyclerView适配器：
public class Register_Adapter extends RecyclerView.Adapter<Register_Adapter.MyHolder> {
//Line number 40
private Context context;
List<dataRegComplaint> data = Collections.emptyList();
List<productlist> data1 = new ArrayList<>( );
Spinner product;
String total;
public static final int CONNECTION_TIMEOUT = 100000;
public static final int READ_TIMEOUT = 150000;
View v;
public Register_Adapter(complaintReg complaintReg,List<dataRegComplaint> data) {
this.context = complaintReg;
this.data = data;
}
@NonNull
@Override
public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.container_register, viewGroup, false);
return new MyHolder( v );
//Line number 60
}
@Override
public void onBindViewHolder(@NonNull MyHolder myHolder, int i) {
final dataRegComplaint current=data.get(i);
myHolder.client.setText(current.getClientName());
myHolder.location.setText("Location: " + current.getAddress());
myHolder.category.setText("Reason: " + current.getCategory());
myHolder.locationid = current.getlocationid();
myHolder.complaint_register.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
total = current.getlocationid();
Log.e( TAG,"Location id :"+total );
context.startActivity( new Intent( context, Register_New_Complaint.class ) );
}
} );
}
@Override
public int getItemCount() {
return data.size();
}
public class MyHolder extends RecyclerView.ViewHolder{
TextView client,location,category;
Button complaint_register;
String locationid;
public MyHolder(@NonNull View itemView) {
super( itemView );
client = (TextView) itemView.findViewById( R.id.textclient );
location = (TextView) itemView.findViewById( R.id.textlocation );
product = (Spinner) itemView.findViewById( R.id.textproduct1 );
category = (TextView) itemView.findViewById( R.id.textcategory );
complaint_register = (Button) itemView.findViewById( R.id.button_register );
product.setOnItemSelectedListener( (AdapterView.OnItemSelectedListener) context );
}
//Line number 105
}
private class GetProduct extends AsyncTask<String,Void,String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... strings) {
HttpURLConnection conn;
URL url = null;
try {
url = new URL( "http://100.98.115.205:8089/productlist.php" );
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout( READ_TIMEOUT );
conn.setConnectTimeout( CONNECTION_TIMEOUT );
conn.setRequestMethod( "POST" );
conn.setDoOutput( true );
OutputStream outputStream = conn.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter( new OutputStreamWriter( outputStream, "UTF-8" ) );
String post_data = URLEncoder.encode( "total", "UTF-8" ) + "=" + URLEncoder.encode(total, "UTF-8" );
Log.e( TAG, "POST DATAv :"+post_data );
bufferedWriter.write( post_data );
bufferedWriter.flush();
bufferedWriter.close();
} 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 ("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute( result );
Log.e( TAG, "RESULT :" +result );
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 );
productlist fishData = new productlist(
json_data.getString( "prod_name" ) );
data1.add( fishData );
Log.e( TAG, "DATA reesult :" +fishData );
}
populateSpinner();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private void populateSpinner() {
List<String> lables = new ArrayList<String>();
for(int i = 0; i < data1.size(); i++){
lables.add( data1.get( i ).getSiteid());
Log.e( TAG, "Spinner :" +lables.add( data1.get( i ).getSiteid()) );
}
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>( context,android.R.layout.simple_spinner_dropdown_item, lables );
spinnerAdapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
product.setAdapter( spinnerAdapter );
}
}
LogCat：
java.lang.ClassCastException: nikhil.loginapp.com.complaintReg cannot be cast to android.widget.AdapterView$OnItemSelectedListener
at nikhil.loginapp.com.Register_Adapter$MyHolder.<init>(Register_Adapter.java:105)
at nikhil.loginapp.com.Register_Adapter.onCreateViewHolder(Register_Adapter.java:60)
at nikhil.loginapp.com.Register_Adapter.onCreateViewHolder(Register_Adapter.java:40)
我正在PostExecute函数中获取数据，但此后它在Spinner中显示错误并且应用程序崩溃。
有人帮助我。