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任何人都可以檢查是否有錯誤。這裏是我的代碼，如果代碼中有任何錯誤，請告訴我？我不知道如何修復代碼Search.java。回收站錯誤
我RecyclerItemClickListener.javapublic interface RecyclerItemClickListener {
void onItemClick(int position);
}
我的適配器HierAdapter.java
public class HireAdapter extends RecyclerView.Adapter<HireAdapter.ViewHolder>{
private ArrayList<HireItem> TeacherItemList;
private Context context;
private RecyclerItemClickListener itemClickListener;
public HireAdapter(Context c, ArrayList<HireItem> teacherItemList, RecyclerItemClickListener listener) {
TeacherItemList = teacherItemList;
context = c;
itemClickListener = listener;
}
public static class ViewHolder extends RecyclerView.ViewHolder{
public final TextView nameText, subjectText,levelText ,cityText;
public ViewHolder(View itemView) {
super(itemView);
nameText = (TextView)itemView.findViewById(R.id.result_name);
subjectText = (TextView)itemView.findViewById(R.id.result_subject);
levelText = (TextView)itemView.findViewById(R.id.result_level);
cityText = (TextView)itemView.findViewById(R.id.result_city);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View rowView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_teachers,parent,false);
final ViewHolder viewHolder = new ViewHolder(rowView);
rowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemClickListener.onItemClick(viewHolder.getLayoutPosition());
}
});
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.nameText.setText(TeacherItemList.get(position).getResult_name());
holder.subjectText.setText(TeacherItemList.get(position).getResult_subject());
holder.levelText.setText(TeacherItemList.get(position).getResult_level());
holder.cityText.setText(TeacherItemList.get(position).getResult_city());
//Here it is simply write onItemClick listener here
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context = v.getContext();
Intent intent = new Intent(context, ProfileTeaAdapter.class);
context.startActivity(intent);
}
});
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
@Override
public int getItemCount() {
return TeacherItemList.size();
}}
這裏Search.java
，我在每一個錯誤寫筆記。因爲我不知道如何糾正一些代碼與HireAdapter和RecyclerItemClickListener一起工作，任何人都可以解決這個錯誤？
public class Search extends Fragment implements RecyclerItemClickListener {
private Context context;
private RecyclerView recyclerView;
private DatabaseReference databaseReference;
private FirebaseAuth firebaseAuth;
private List<HireItem> hireItem = new ArrayList<>();
HireAdapter mAdapter;
ImageView bt_search;
ProgressDialog progressDialog;
Spinner spinner_sort;
String key = "req_skill1";
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_search,container,false);
//Getting FireBase Instance
firebaseAuth = FirebaseAuth.getInstance();
databaseReference = FirebaseDatabase.getInstance().getReference("teachers");
//Getting id of Views
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.rv_places);
recyclerView.setAdapter(mAdapter);
//
bt_search = (ImageView)view.findViewById(R.id.bt_search);
spinner_sort = (Spinner)view.findViewById(R.id.spinner_sort);
setupSpinner();
List<HireItem> hireItem = new ArrayList<>();
mAdapter = new HireAdapter(getContext(),R.layout.list_item_teachers,hireItem); // error at (getContext(),R.layout.list_item_teachers,hireItem)
bt_search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mAdapter != null){
mAdapter.clear(); // error at .clear();
}
progressDialog = new ProgressDialog(getContext());
progressDialog.setMessage("Searching Teachers");
progressDialog.show();
FirebaseDatabase.getInstance().getReference("teachers").orderByChild("subject").startAt(key).endAt(key + "~")
.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Teachers child = dataSnapshot.getValue(Teachers.class);
HireItem hireItem = new HireItem(child.teaname, child.city, child.subject, child.level, child.sex,child.mobile, child.qualification, child.skill1, child.experince, child.salary,child.age);
mAdapter.add(hireItem); // error at .add
progressDialog.dismiss();
if(mAdapter == null){
Toast.makeText(getContext(), "No Match Found", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
if(mAdapter == null){
Toast.makeText(getContext(), "No Match Found", Toast.LENGTH_SHORT).show();
}
else{
recyclerView.setAdapter(mAdapter); // error at recyclerView
}
}
});
return view;
}
private void setupSpinner(){
ArrayAdapter adapter = ArrayAdapter.createFromResource(getContext(),R.array.array_teacher_sort,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner_sort.setAdapter(adapter);
spinner_sort.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
key = (String)adapterView.getItemAtPosition(i);
if(key.equals(getString(R.string.sort_A))){
key = "Math";
}else if(key.equals(getString(R.string.sort_AA))){
key = "computer";
}
else if(key.equals(getString(R.string.sort_AB))){
key = "Biology";
}
else if(key.equals(getString(R.string.sort_AD))){
key = "Physics";
}
else if(key.equals(getString(R.string.sort_AXX))){
key = "Holy Quran";
}
else if(key.equals(getString(R.string.sort_AZ))){
key = "Chysics";
}
else if(key.equals(getString(R.string.sort_AS))){
key = "English";
}
else if(key.equals(getString(R.string.sort_AQ))){
key = "Arabic";
}
else if(key.equals(getString(R.string.sort_ADD))){
key = "Science";
}
else if(key.equals(getString(R.string.sort_AE))){
key = "History";
}
else if(key.equals(getString(R.string.sort_AW))){
key = "Geograpghy";
}
else if(key.equals(getString(R.string.sort_AR))){
key = "Art education";
}
else if(key.equals(getString(R.string.sort_AT))){
key = "Family education";
}
else if(key.equals(getString(R.string.sort_aae))){
key = "Religion";
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
@Override
public void onResume() {
super.onResume();
mAdapter.clear(); // error at .clear();
}
@Override
public void onItemClick(int position) {
} }
_什麼error_？你有堆棧跟蹤嗎？ –
你有沒有試過運行這段代碼？ – CodeCameo
執行此語句時'recyclerView.setAdapter（mAdapter）;''mAdapter'爲'null'。 – Titus