我在Android Studio中创建了一个应用程序，使用RecyclerView中的CardView与Firebase Realtime数据库相关联，用户可以在其中检查他的出勤情况，以便如果用户在假期(R，G，周六或周日(来，CardView是彩色的。但是在我的代码中，只有第一个 CardView 被着色。我已经检查了日志语句，它正在遍历 R 和 G 的 if-else 语句。
我的代码是：
public class frag2ofAttendanceNew extends Fragment {
String mPinFromFrag1ofAttendance;
String yearf1;
String monthf1;
private RecyclerView mRecyclerView;
DatabaseReference myRef;
DatabaseReference holidaysRef;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
Log.d("abcd","oncreate view reached");
final View v= inflater.inflate(R.layout.fragment_frag2of_attendance_new, container, false);
Log.d("abcd","oncreate view reached and layout inflated");
mRecyclerView = (RecyclerView)v.findViewById(R.id.recycler_view);
return v;
}
@Override
public void onStart(){
super.onStart();
Log.d("abcd","onstart reached");
Bundle b = getArguments();
if(b!=null){
mPinFromFrag1ofAttendance = b.getString("mPinToFrag2ofAttendance");
Log.d("abcd","Receiving from frag1ofAttendance");
yearf1 = b.getString("year");
monthf1 = b.getString("month");
}
Log.d("abcd",mPinFromFrag1ofAttendance);
myRef = FirebaseDatabase.getInstance().getReference().child("Attendance_Records").child(mPinFromFrag1ofAttendance).child(yearf1).child(monthf1);
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(),LinearLayoutManager.VERTICAL,false);
mRecyclerView.setLayoutManager(layoutManager);
//mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
Log.d("abcd","setlayoutmanager");
FirebaseRecyclerOptions options = new FirebaseRecyclerOptions.Builder<Attendance_Records>().setQuery(myRef,Attendance_Records.class).build();
Log.d("abcd","recycleroptions reached");
FirebaseRecyclerAdapter<Attendance_Records,AttendanceViewHolder> adapter =
new FirebaseRecyclerAdapter<Attendance_Records, AttendanceViewHolder>
(options) {
@NonNull
@Override
public AttendanceViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.d("abcd","oncreateviewholder reached");
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card,parent,false);
Log.d("abcd","cardview inflated");
return new AttendanceViewHolder(view);
}
@Override
protected void onBindViewHolder(AttendanceViewHolder holder, int position, Attendance_Records model) {
holidaysRef=FirebaseDatabase.getInstance().getReference().child("Holidays");
final String userdate = model.getDate();
try {
Log.d("abcd","StringTodate about to be called");
StringToDate(userdate);
} catch (ParseException e) {
e.printStackTrace();
}
holidaysRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(final DataSnapshot dataSnapshot) {
if(dataSnapshot.child(userdate).exists()){
Log.d("abcd","date matched");
final DatabaseReference tilldateRef = holidaysRef.child(userdate);
tilldateRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot1) {
if(dataSnapshot1.child("G").exists()){
Log.d("abcd","its G");
CardView cv = getView().findViewById(R.id.card_view);
Log.d("abcd","cardview found");
cv.setCardBackgroundColor(Color.CYAN);
Log.d("abcd","changed cv color");
}
else if(dataSnapshot1.child("R").exists()){
Log.d("abcd","its R");
CardView cv = getView().findViewById(R.id.card_view);
Log.d("abcd","cardview found");
cv.setCardBackgroundColor(Color.MAGENTA);
Log.d("abcd","changed cv color");
}
else if(day==7){
Log.d("abcd","its Saturday");
CardView cv = getView().findViewById(R.id.card_view);
Log.d("abcd","cardview found");
cv.setCardBackgroundColor(Color.GRAY);
Log.d("abcd","changed cv color");
}
else if(day==1){
Log.d("abcd","its Sunday");
CardView cv = getView().findViewById(R.id.card_view);
Log.d("abcd","cardview found");
cv.setCardBackgroundColor(Color.DKGRAY);
Log.d("abcd","changed cv color");
}
else{
Log.d("abcd","None from G,R or Weekend");
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
holder.setYear(model.getYear());
holder.setMonth(model.getMonth());
holder.setDate(model.getDate());
holder.setIntime(model.getInTime());
holder.setOuttime(model.getOutTime());
holder.setStatus(model.getStatus());
holder.setEntrydate(model.getEntryDate());
holder.setMyid(model.getMyID());
Log.d("abcd","onbindviewholder reached");
}
};
mRecyclerView.setAdapter(adapter);
adapter.startListening();
}
private void StringToDate(String date) throws ParseException{
Log.d("abcd","StringtoDate reached");
DateFormat formatter = null;
Date convertedDate = null;
formatter = new SimpleDateFormat("dd-MM-yyyy");
convertedDate = (Date)formatter.parse(date);
Log.d("abcd","date converted");
Calendar c = Calendar.getInstance();
Log.d("abcd","Calendar getInstance reached");
c.setTime(convertedDate);
Log.d("abcd","userdate set in Calendar");
day = c.get(Calendar.DAY_OF_WEEK);
Log.d("abcd","day of week is "+day);
}
public class AttendanceViewHolder extends RecyclerView.ViewHolder{
TextView vhyear, vhmonth, vhdate, vhintime, vhouttime, vhentrydate, vhstatus, vhmyid;
public AttendanceViewHolder(View itemView){
super(itemView);
Log.d("abcd","attendanceviewholder reached");
vhyear = itemView.findViewById(R.id.year);
vhmonth = itemView.findViewById(R.id.month);
vhdate = itemView.findViewById(R.id.date);
vhintime = itemView.findViewById(R.id.inTime);
vhouttime = itemView.findViewById(R.id.outTime);
vhentrydate = itemView.findViewById(R.id.entryDate);
vhstatus = itemView.findViewById(R.id.status);
vhmyid = itemView.findViewById(R.id.userId);
Log.d("abcd","textviews found");
}
public void setYear(String year) {
Log.d("abcd","setyear reached");
vhyear.setText(year);
Log.d("abcd",vhyear.getText().toString());
}
public void setMonth(String month) {
Log.d("abcd","setmonth reached");
vhmonth.setText(month);
}
public void setDate(String date) {
Log.d("abcd","setdate reached");
vhdate.setText(date);
}
public void setIntime(String inTime) {
Log.d("abcd","setintime reached");
vhintime.setText(inTime);
}
public void setOuttime(String outTime) {
Log.d("abcd","setouttime reached");
vhouttime.setText(outTime);
}
public void setEntrydate(String entrydate){
Log.d("abcd","setentrydate reached");
vhentrydate.setText(entrydate);
}
public void setStatus(String status){
Log.d("abcd","setstatus reached");
vhstatus.setText(status);
}
public void setMyid(String myid){
Log.d("abcd","setmyid reached");
vhmyid.setText(myid);
}
}
}
我的Attendance_Records桌
我的假期表
更新
我已经在假期表中实现了假期，但仍然无法为周末着色。我应该把这些条件放在别的地方吗？
您应该在 ViewHolder 中定义 CardView：
CardView cv;
public AttendanceViewHolder(View itemView){
super(itemView);
Log.d("abcd","attendanceviewholder reached");
vhyear = itemView.findViewById(R.id.year);
cv = itemView.findViewById(R.id.card_view);
...
}
然后使用
holder.cv.setCardBackgroundColor(Color.CYAN);
而不是
CardView cv = getView().findViewById(R.id.card_view);
Log.d("abcd","cardview found");
cv.setCardBackgroundColor(Color.CYAN);