java - 如何在android studio中按类别对recyclerview项目进行分组

Question

我想在 android studio 中按日期对我的 recyclerview 进行分组，而不使用任何库，我做了一些事情，但没有得到我想要的。我已经上传了我的结果图像，所以我想将它与“getDateSection”分组。但是这里 DateSection 不是根据日期显示在每个项目上方。我只想在相应数据组的顶部显示每个日期一次：

这是我的代码。

DowntimeReportingAdapter.java

public class DowntimeReportingAdapter extends RecyclerView.Adapter<DowntimeReportingAdapter.MyViewHolder> implements Filterable {

    public List<DowntimeReportingUri> downtimeReportingUriList;
    private final List<DowntimeReportingUri> downtimeUriFilter;
    GridLayoutManager mLayoutManager;
    private final Context context;
    private DowntimeReportingFilter filter;
    Activity mContext;
    Context ctx;


    public DowntimeReportingAdapter(List<DowntimeReportingUri> downtimeReportingUriList, Context context) {
        this.downtimeReportingUriList = downtimeReportingUriList;
        this.downtimeUriFilter = downtimeReportingUriList;
        this.context = context;
    }

    @NotNull
    @Override
    public MyViewHolder onCreateViewHolder(@NotNull ViewGroup parent, int viewType) {
       View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.downtime_reporting_item,
                parent, false);
        return new MyViewHolder(view);
    }

    @SuppressLint({"CheckResult", "SetTextI18n"})
    @Override
    public void onBindViewHolder(final MyViewHolder myViewHolder, int position) {
            
            if(downtimeReportingUriList.get(position).getDatesection().isEmpty()){
                myViewHolder.mDateSection.setVisibility(View.GONE) ;
            } else {
                myViewHolder.mDateSection.setText(downtimeReportingUriList.get(position).getDatesection());
            }
            
            RequestOptions requestOptions1 = new RequestOptions();
            requestOptions1.skipMemoryCache(true);
            requestOptions1.diskCacheStrategy(DiskCacheStrategy.ALL);
            requestOptions1.placeholder(R.drawable.full_image_blue);
            requestOptions1.error(R.drawable.full_image_blue);

            Glide.with(context)
                    .load(downtimeReportingUriList.get(position).getPicture())
                    .apply(requestOptions1)
                    .into(myViewHolder.mPicture);

            myViewHolder.issue.setText(downtimeReportingUriList.get(position).getIssues());
            myViewHolder.factory.setText(downtimeReportingUriList.get(position).getFactory());
            myViewHolder.line.setText(downtimeReportingUriList.get(position).getLine());
            myViewHolder.createdBy.setText(downtimeReportingUriList.get(position).getCreatedby());
            myViewHolder.modifiedBy.setText(downtimeReportingUriList.get(position).getModifiedby());
            myViewHolder.description.setText(downtimeReportingUriList.get(position).getDescription());
            myViewHolder.section.setText(downtimeReportingUriList.get(position).getSection());

            myViewHolder.mIssues.setText(downtimeReportingUriList.get(position).getIssues());
            myViewHolder.mCreated.setText(downtimeReportingUriList.get(position).getCreated());
            myViewHolder.mType.setText(downtimeReportingUriList.get(position).getStatus() + " | "
                    + downtimeReportingUriList.get(position).getDifference() + " | "
                    + downtimeReportingUriList.get(position).getFactory());
    }

    @Override
    public int getItemCount() {
        return downtimeReportingUriList.size();
    }

    @Override
    public Filter getFilter() {
        if (filter==null) {
            filter=new DowntimeReportingFilter((ArrayList<DowntimeReportingUri>) downtimeUriFilter,this);
        }
        return filter;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        Space space;
        LikeButton mLove;
        DatabaseHandler db;
        LinearLayout linearLayout;
        private CircleImageView mPicture;
        private final ApiInterface apiInterface;
        CardView mRowContainer, mRowContainerGrid;
        ImageView mForward, mStatus;
        private HashMap<String, String> user = new HashMap<>();
        TextView mIssues, mType, mCreated, issue, factory, line, createdBy, modifiedBy, description, section, mIssuesGrid, mDateSection;

        @SuppressLint("CutPasteId")
        public MyViewHolder(View itemView, int viewType) {
            super(itemView);
            apiInterface = ApiClient.getApiClient().create(ApiInterface.class);
                mPicture = itemView.findViewById(R.id.downtime_reporting_picture);
                mIssues = itemView.findViewById(R.id.downtime_reporting_issues);
                mIssues.setMovementMethod(new ScrollingMovementMethod());
                mType = itemView.findViewById(R.id.downtime_reporting_type);
                mLove = itemView.findViewById(R.id.downtime_reporting_like);
                mStatus = itemView.findViewById(R.id.current_status);
                mCreated = itemView.findViewById(R.id.downtime_reporting_created);
                mRowContainer = itemView.findViewById(R.id.downtime_reporting_row_container);
                linearLayout = itemView.findViewById(R.id.linearLayout);
                issue = itemView.findViewById(R.id.issues);
                factory = itemView.findViewById(R.id.factory);
                line = itemView.findViewById(R.id.line);
                createdBy = itemView.findViewById(R.id.createdby);
                modifiedBy = itemView.findViewById(R.id.modifiedby);
                description = itemView.findViewById(R.id.description);
                section = itemView.findViewById(R.id.section);
                space = itemView.findViewById(R.id.space);
                mDateSection = itemView.findViewById(R.id.datesection);

        }
    }
}

停机时间报告.java

public class DowntimeReporting extends Fragment {

    DatabaseHandler db;
    MaterialButton refresh;
    SessionManager session;
    ProgressDialog pDialog;
    private RadioGroup sortRG;
    ApiInterface apiInterface;
    private TextView textResult;
    TextView textName, textEmail;
    private RecyclerView recyclerView;
    private LinearLayout linearLayout;
    SwipeRefreshLayout mSwipeRefreshLayout;
    private ImageView sortB, goTop, filterB;
    ShimmerFrameLayout mShimmerViewContainer;
    FloatingActionButton floatingActionButton;
    private GridLayoutManager gridLayoutManager;
    HashMap<String,String> user = new HashMap<>();
    private DowntimeReportingAdapter downtimeAdapter;
    private List<DowntimeReportingUri> downtimeUriList;
    private static final String TAG = DowntimeReporting.class.getSimpleName();

    public DowntimeReporting() {

    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        ((Home) Objects.requireNonNull(getActivity())).setActionBarTitle("Downtime Reporting / Open Machine Issue");

        View view = inflater.inflate(R.layout.downtime_reporting, container, false);
        textName = view.findViewById(R.id.name);
        textEmail = view.findViewById(R.id.email);

        view.findViewById(R.id.fab).setOnClickListener(v -> showPrompt());

        pDialog = new ProgressDialog(getActivity());
        pDialog.setCancelable(false);

        db = new DatabaseHandler(getActivity().getApplicationContext());
        user = db.getUserDetails();

        session = new SessionManager(getActivity().getApplicationContext());
        if (!session.isLoggedIn()) {
            logoutUser();
        }

        refresh = view.findViewById(R.id.refresh);
        refresh.setOnClickListener(v -> {
            onResume();
            refresh.setVisibility(View.GONE);
        });

        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);

        apiInterface = ApiClient.getApiClient().create(ApiInterface.class);
        recyclerView = view.findViewById(R.id.recyclerView);
        mShimmerViewContainer = view.findViewById(R.id.shimmer_view_container);
        mSwipeRefreshLayout = view.findViewById(R.id.swipeToRefresh);
        mSwipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary);
        mSwipeRefreshLayout.setOnRefreshListener(() -> {
            onResume();
            mSwipeRefreshLayout.setRefreshing(false);
            refresh.setVisibility(View.GONE);
        });

        gridLayoutManager = new GridLayoutManager(getActivity(), SPAN_COUNT_ONE);
        recyclerView.setLayoutManager(gridLayoutManager);

        linearLayout = view.findViewById(R.id.no_result);
        textResult = view.findViewById(R.id.text_result);

        floatingActionButton = view.findViewById(R.id.fab);
        floatingActionButton.setOnClickListener(view1 -> startActivity(new Intent(getActivity(), DowntimeReportingForm.class)));
        return view;
    }

    public void getDowntimes(){

        Call<List<DowntimeReportingUri>> call = apiInterface.getDowntimes();
        call.enqueue(new Callback<List<DowntimeReportingUri>>() {
            @SuppressLint("NonConstantResourceId")
            @Override
            public void onResponse(@NotNull Call<List<DowntimeReportingUri>> call, @NotNull Response<List<DowntimeReportingUri>> response) {
                mShimmerViewContainer.stopShimmer();
                mShimmerViewContainer.setVisibility(View.GONE);
                downtimeUriList = response.body();
                Log.i(DowntimeReporting.class.getSimpleName(), Objects.requireNonNull(response.body()).toString());
                downtimeAdapter = new DowntimeReportingAdapter(downtimeUriList, gridLayoutManager, getActivity());
                ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
                itemTouchHelper.attachToRecyclerView(recyclerView);
                Log.d(TAG, "Number Downtime Reporting Received: " + downtimeUriList.size());
                recyclerView.setAdapter(downtimeAdapter);
                downtimeAdapter.notifyDataSetChanged();
            }

            @Override
            public void onFailure(@NotNull Call<List<DowntimeReportingUri>> call, @NotNull Throwable t) {
                mShimmerViewContainer.stopShimmer();
                refresh.setVisibility(View.VISIBLE);
                LayoutInflater inflater = Objects.requireNonNull(getActivity()).getLayoutInflater();
                View layout = inflater.inflate(R.layout.custom_toast_message, getActivity().findViewById(R.id.custom_toast_container));
                TextView text = layout.findViewById(R.id.text);
                text.setText(t.getMessage());
                Toast toast = new Toast(getActivity().getApplicationContext());
                CardView cardView = layout.findViewById(R.id.card_view);
                cardView.setBackgroundResource(R.drawable.error_style);
                ImageView toastImageView = layout.findViewById(R.id.toastImageView);
                toastImageView.setImageResource(R.drawable.error);
                toast.setGravity(Gravity.BOTTOM, 0, 40);
                toast.setDuration(Toast.LENGTH_SHORT);
                toast.setView(layout);
                toast.show();
            }
        });
    }

    @Override
    public void onResume() {
        super.onResume();
        mShimmerViewContainer.startShimmer();
        refresh.setVisibility(View.GONE);
        getDowntimes();
    }

    @Override
    public void onPause() {
        super.onPause();
        mShimmerViewContainer.stopShimmer();
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        setHasOptionsMenu(true);
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onCreateOptionsMenu(@NotNull Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.downtime_reporting_menu, menu);
        SearchManager searchManager = (SearchManager) Objects.requireNonNull(getActivity()).getSystemService(Context.SEARCH_SERVICE);
        final SearchView searchView = (SearchView) menu.findItem(R.id.downtime_reporting_search).getActionView();
        LinearLayout searchBar = searchView.findViewById(R.id.search_bar);
        searchBar.setLayoutTransition(new LayoutTransition());
        MenuItem searchMenuItem = menu.findItem(R.id.downtime_reporting_search);
        searchView.setSearchableInfo(
                searchManager.getSearchableInfo(getActivity().getComponentName())
        );
        searchView.setQueryHint("Search DownTime Reporting Activity...");
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(final String query) {
                downtimeAdapter.getFilter().filter(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                if(newText!=null)
                    downtimeAdapter.getFilter().filter(newText);
                if(downtimeAdapter.getItemCount()<1){
                    recyclerView.setVisibility(View.GONE);
                    linearLayout.setVisibility(View.VISIBLE);
                    textResult.setText(R.string.no_result);
                } else {
                    recyclerView.setVisibility(View.VISIBLE);
                    downtimeAdapter.getFilter().filter(newText);
                    linearLayout.setVisibility(View.GONE);
                }
                return false;
            }
        });

        searchMenuItem.getIcon().setVisible(false, false);
    }

    @Override
    public boolean onOptionsItemSelected(@NotNull MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.downtime_reporting_menu_switch_layout) {
            switchLayout();
            switchIcon(item);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

downtime_reporting_item.xml

<LinearLayout
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/datesection"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="2dp"
        android:layout_marginTop="2dp"
        android:gravity="center"
        android:text="@string/currently_not_available"
        android:layout_gravity="center"
        android:textColor="@color/mainText"
        android:textSize="16sp"/>

<androidx.cardview.widget.CardView
    android:id="@+id/downtime_reporting_row_container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:backgroundTint="@color/card_bg"
    card_view:cardCornerRadius="12dp"
    card_view:cardElevation="2dp"
    android:layout_weight="2"
    android:layout_marginTop="10dp"
    android:layout_marginRight="4dp"
    android:layout_marginLeft="4dp">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="110dp"
        android:layout_gravity="center"
        android:orientation="vertical">

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="2dp"
                android:layout_alignParentEnd="true">

                <ImageView
                    android:id="@+id/btmDialog"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    android:src="@drawable/ic_baseline_more_horiz_24" />

                <Space
                    android:layout_width="15dp"
                    android:layout_height="wrap_content"/>

                <ImageView
                    android:id="@+id/dropdown"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    android:src="@drawable/ic_baseline_arrow_drop_down_24" />

                <Space
                    android:layout_width="15dp"
                    android:layout_height="wrap_content"/>

                <ImageView
                    android:id="@+id/current_status"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:padding="2dp"
                    android:src="@drawable/open_status" />

                <Space
                    android:layout_width="15dp"
                    android:layout_height="wrap_content"/>

                <ImageView
                    android:id="@+id/forward"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    android:padding="2dp"
                    android:visibility="gone"
                    android:src="@drawable/forward" />

                <Space
                    android:id="@+id/space"
                    android:layout_width="15dp"
                    android:layout_height="wrap_content"
                    android:visibility="gone"/>

            </LinearLayout>

            <de.hdodenhof.circleimageview.CircleImageView
                android:id="@+id/downtime_reporting_picture"
                android:layout_width="70dp"
                android:layout_height="70dp"
                android:layout_centerVertical="true"
                android:layout_marginStart="16dp"
                android:src="@drawable/full_image_blue"
                android:transitionName="@string/simple_activity_transition" />

            <LinearLayout
                android:id="@+id/layoutName"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignTop="@+id/downtime_reporting_picture"
                android:layout_alignParentStart="true"
                android:layout_marginStart="90dp"
                android:layout_marginEnd="15dp"
                android:layout_marginBottom="5dp"
                android:gravity="top"
                android:orientation="horizontal"
                android:weightSum="100">

                <TextView
                    android:id="@+id/downtime_reporting_issues"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="100"
                    android:scrollbars="vertical"
                    android:singleLine="true"
                    android:ellipsize="end"
                    android:paddingTop="5dp"
                    android:inputType="textPersonName"
                    android:text="@string/currently_not_available"
                    android:textColor="@color/mainText"
                    android:textStyle="bold"
                    android:transitionName="@string/title_transition" />

                <Space
                    android:layout_width="5dp"
                    android:layout_height="wrap_content"/>

                <TextView
                    android:id="@+id/downtime_reporting_created"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="10"
                    android:gravity="end"
                    android:paddingTop="5dp"
                    android:text="@string/currently_not_available"
                    android:textColor="@color/date"
                    />
            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/layoutName"
                android:layout_alignStart="@+id/layoutName"
                android:layout_alignBottom="@+id/downtime_reporting_picture"
                android:layout_marginEnd="15dp"
                android:gravity="top"
                android:layout_centerInParent="true"
                android:orientation="horizontal"
                android:weightSum="2">

                <TextView
                    android:id="@+id/downtime_reporting_type"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:singleLine="true"
                    android:ellipsize="end"
                    android:layout_gravity="center"
                    android:scrollbars="vertical"
                    android:gravity="start"
                    android:text="@string/currently_not_available"
                    android:textColor="@color/mainText"
                    android:transitionName="descTransition" />

                <com.like.LikeButton
                    app:liked="false"
                    android:id="@+id/downtime_reporting_like"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    android:layout_width="40dp"
                    android:layout_height="40dp"
                    android:layout_gravity="center"
                    android:layout_weight="1"
                    app:icon_type="thumb"
                    app:is_enabled="false"/>
            </LinearLayout>
    </RelativeLayout>
    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:animateLayoutChanges="true"
        android:orientation="vertical"
        android:visibility="gone">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scaleType="fitXY" />

        <TableLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="15dp">

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/issue"
                    android:textColor="@color/mainText" />

                <TextView
                    android:id="@+id/issues"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/mainText"
                    android:text="@string/currently_not_available"
                    android:textStyle="bold" />
            </TableRow>

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Factory   "
                    android:textColor="@color/mainText" />

                <TextView
                    android:id="@+id/factory"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/mainText"
                    android:text="@string/currently_not_available"
                    android:textStyle="bold" />
            </TableRow>

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/mainText"
                    android:text="Line   " />

                <TextView
                    android:id="@+id/line"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/currently_not_available"
                    android:textColor="@color/mainText"
                    android:textStyle="bold" />
            </TableRow>

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Section   "
                    android:textColor="@color/mainText"/>

                <TextView
                    android:id="@+id/section"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/mainText"
                    android:text="@string/currently_not_available"
                    android:textStyle="bold" />
            </TableRow>

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/mainText"
                    android:text="Created By   " />

                <TextView
                    android:id="@+id/createdby"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/currently_not_available"
                    android:textColor="@color/mainText"
                    android:textStyle="bold" />
            </TableRow>

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/mainText"
                    android:text="Modified By   " />

                <TextView
                    android:id="@+id/modifiedby"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/currently_not_available"
                    android:textColor="@color/mainText"
                    android:textStyle="bold" />
            </TableRow>

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Description   "
                    android:textColor="@color/mainText"/>

                <TextView
                    android:id="@+id/description"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:inputType="textMultiLine"
                    android:textColor="@color/mainText"
                    android:text="@string/currently_not_available"
                    android:textStyle="bold" />
            </TableRow>
        </TableLayout>
    </LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>

DowntimeReportingUri.java

 public class DowntimeReportingUri {

    @SerializedName("id")
    private int id;
    @SerializedName("createdby")
    private String createdby;
    @SerializedName("issues")
    private String issues;
    @SerializedName("description")
    private String description;
    @SerializedName("datesection")
    private String datesection;

public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getIssues() {
        return issues;
    }

    public void setIssues(String issues) {
        this.issues = issues;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getDatesection() {
        return datesection;
    }

    public void setDatesection(String datesection) {
        this.datesection = datesection;
    }
}

标签： javaandroidmysqlxmlcrud

Answer 1

您需要为此使用嵌套的recycleview。您的标题（即日期）的父级recycleview 和内容的子级。

供参考：https ://www.geeksforgeeks.org/how-to-create-a-nested-recyclerview-in-android/