android.widget.LinearLayout 不能轉換為 android.support.v7.widget.RecyclerView

Question

我正在做付費應用程序定制搜索並遵循一些說明但無法完成工作。 從其他布局和 Java 類復制相同的數據以創建新的數據，因為它解釋了但與布局沖突我的片段：

    public class FragmentSongs extends Fragment {

    RecyclerView recyclerView;
    ArrayList<ItemSong> arrayList;
    AdapterSongList adapterSongList;
    ZProgressHUD progressHUD;
    GridLayoutManager gridLayoutManager;
    LinearLayoutManager linearLayoutManager;
    TextView textView_empty;
    Button button_try;
    LinearLayout ll_empty;
    String errr_msg;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.layout_songlist, container, false);

        progressHUD = ZProgressHUD.getInstance(getActivity());
        progressHUD.setMessage(getActivity().getResources().getString(R.string.loading));
        progressHUD.setSpinnerType(ZProgressHUD.FADED_ROUND_SPINNER);

        arrayList = new ArrayList<>();
        recyclerView = rootView.findViewById(R.id.ll_songlist);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(gridLayoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
       recyclerView.setHasFixedSize(true);

        ll_empty = rootView.findViewById(R.id.ll_empty);
        textView_empty = rootView.findViewById(R.id.textView_empty_msg);
        button_try = rootView.findViewById(R.id.button_empty_try);

        loadSongs();

        recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                FragmentManager fm = getFragmentManager();
                FragmentSongs f1 = new FragmentSongs();
                FragmentTransaction ft = fm.beginTransaction();

                Bundle bundl = new Bundle();
                bundl.putString("type", getString(R.string.allsong));
                bundl.putString("id", arrayList.get(getPosition(adapterSongList.getID(position))).getId());
                bundl.putString("name", arrayList.get(getPosition(adapterSongList.getID(position))).getMp3Name());
                f1.setArguments(bundl);
                ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                ft.hide(getFragmentManager().findFragmentByTag(getResources().getString(R.string.allsong)));
                ft.add(R.id.fragment, f1, arrayList.get(getPosition(adapterSongList.getID(position))).getMp3Name());
                ft.addToBackStack(arrayList.get(getPosition(adapterSongList.getID(position))).getMp3Name());
                ft.commit();
            }
        }));

        button_try.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                loadSongs();
            }
        });

        return rootView;
    }

    private void loadSongs() {
        if (JsonUtils.isNetworkAvailable(getActivity())) {
            new LoadArtist().execute(Constant.URL_LATEST);
        } else {
            errr_msg = getString(R.string.internet_not_conn);
            setEmpty();
        }
    }

    private class LoadArtist extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute() {
            arrayList.clear();
            ll_empty.setVisibility(View.GONE);
            recyclerView.setVisibility(View.VISIBLE);
            progressHUD.show();
            super.onPreExecute();
        }

        @Override
        protected String doInBackground(String... strings) {
            try {
                String json = JsonUtils.getJSONString(strings[0]);
                JSONObject mainJson = new JSONObject(json);
                JSONArray jsonArray = mainJson.getJSONArray(Constant.TAG_ROOT);
                JSONObject objJson = null;
                for (int i = 0; i < jsonArray.length(); i++) {
                    objJson = jsonArray.getJSONObject(i);

                    String id = objJson.getString(Constant.TAG_ID);
                    String cid = objJson.getString(Constant.TAG_CAT_ID);
                    String cname = objJson.getString(Constant.TAG_CAT_NAME);
                    String artist = objJson.getString(Constant.TAG_ARTIST);
                    String name = objJson.getString(Constant.TAG_SONG_NAME);
                    String url = objJson.getString(Constant.TAG_MP3_URL);
                    String desc = objJson.getString(Constant.TAG_DESC);
                    String duration = objJson.getString(Constant.TAG_DURATION);
                    String total_rate = objJson.getString(Constant.TAG_TOTAL_RATE);
                    String avg_rate = objJson.getString(Constant.TAG_AVG_RATE);
                    String thumb = objJson.getString(Constant.TAG_THUMB_B).replace(" ", "%20");
                    String thumb_small = objJson.getString(Constant.TAG_THUMB_S).replace(" ", "%20");
                    String views = objJson.getString(Constant.TAG_VIEWS);
                    String downloads = objJson.getString(Constant.TAG_DOWNLOADS);

                    ItemSong objItem = new ItemSong(id, cid, cname, artist, url, thumb, thumb_small, name, duration, desc, total_rate, avg_rate,views,downloads);

                    arrayList.add(objItem);
                }
                return "1";
            } catch (JSONException e) {
                e.printStackTrace();
                return "0";
            } catch (Exception ee) {
                ee.printStackTrace();
                return "0";
            }

        }

        @Override
        protected void onPostExecute(String s) {
            if (getActivity() != null) {
                if (s.equals("1")) {
                    progressHUD.dismissWithSuccess(getResources().getString(R.string.success));

                    adapterSongList = new AdapterSongList(getActivity(), arrayList, new RecyclerClickListener() {
                        @Override
                        public void onClick(int position) {
                            if (JsonUtils.isNetworkAvailable(getActivity())) {

                            } else {
                                Toast.makeText(getActivity(), getResources().getString(R.string.internet_not_conn), Toast.LENGTH_SHORT).show();
                            }
                        }
                    }, "online");
                    recyclerView.setAdapter(adapterSongList);
                    errr_msg = getString(R.string.no_data_found);
                } else {
                    progressHUD.dismissWithFailure(getResources().getString(R.string.error));

                    errr_msg = getString(R.string.server_no_conn);
                }

                setEmpty();
                super.onPostExecute(s);
            }
        }
    }


    public void setEmpty() {
        if(arrayList.size() > 0) {
            recyclerView.setVisibility(View.VISIBLE);
            ll_empty.setVisibility(View.GONE);
        } else {
            textView_empty.setText(errr_msg);
            recyclerView.setVisibility(View.GONE);
            ll_empty.setVisibility(View.VISIBLE);
        }
    }

    private int getPosition(String id) {
        int count = 0;
        for (int i = 0; i < arrayList.size(); i++) {
            if (id.equals(arrayList.get(i).getId())) {
                count = i;
                break;
            }
        }
        return count;
    }

和我的適配器

    public class AdapterSongList extends RecyclerView.Adapter<AdapterSongList.MyViewHolder> {

    private Context context;
    private ArrayList<ItemSong> arrayList;
    private ArrayList<ItemSong> filteredArrayList;
    private RecyclerClickListener recyclerClickListener;
    private NameFilter filter;
    private String type;
    private JsonUtils jsonUtils;

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView_song, textView_duration, textView_catname, textView_total_rate, textView_views, textView_downloads;
        EqualizerView equalizer;
        ImageView imageView, imageView_option;
        LinearLayout linearLayout, ll_counts;
        RatingBar ratingBar;

        MyViewHolder(View view) {
            super(view);
            linearLayout = view.findViewById(R.id.ll_songlist);
            ll_counts = view.findViewById(R.id.ll_counts);
            textView_song = view.findViewById(R.id.textView_songname);
            textView_duration = view.findViewById(R.id.textView_songduration);
            textView_total_rate = view.findViewById(R.id.textView_totalrate_songlist);
            equalizer = view.findViewById(R.id.equalizer_view);
            textView_catname = view.findViewById(R.id.textView_catname);
            imageView = view.findViewById(R.id.imageView_songlist);
            imageView_option = view.findViewById(R.id.imageView_option_songlist);
            ratingBar = view.findViewById(R.id.ratingBar_songlist);
            textView_views = view.findViewById(R.id.textView_views);
            textView_downloads = view.findViewById(R.id.textView_downloads);
        }
    }

    public AdapterSongList(Context context, ArrayList<ItemSong> arrayList, RecyclerClickListener recyclerClickListener, String type) {
        this.arrayList = arrayList;
        this.filteredArrayList = arrayList;
        this.context = context;
        this.type = type;
        this.recyclerClickListener = recyclerClickListener;
        jsonUtils = new JsonUtils(context);
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.layout_songlist, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder holder, int position) {

        holder.textView_song.setText(arrayList.get(position).getMp3Name());
        holder.textView_duration.setText(arrayList.get(position).getDuration());

        if (!type.equals("offline")) {
            holder.textView_total_rate.setText(arrayList.get(position).getTotalRate());
            holder.ratingBar.setRating(Float.parseFloat(arrayList.get(position).getAverageRating()));
            holder.textView_views.setText(jsonUtils.format(Double.parseDouble(arrayList.get(position).getViews())));
            holder.textView_downloads.setText(jsonUtils.format(Double.parseDouble(arrayList.get(position).getDownloads())));
        } else {
            holder.textView_total_rate.setVisibility(View.GONE);
            holder.ratingBar.setVisibility(View.GONE);
            holder.ll_counts.setVisibility(View.GONE);
        }

        if (!type.equals("offline") || type.equals("fav")) {
            Picasso.get()
                    .load(arrayList.get(position).getImageSmall())
                    .into(holder.imageView);
        } else {
            holder.imageView.setImageBitmap(arrayList.get(position).getBitmap());
        }

        if (Constant.isPlaying && Constant.arrayList_play.get(Constant.playPos).getId().equals(arrayList.get(position).getId())) {
            holder.equalizer.animateBars();
            holder.equalizer.setVisibility(View.VISIBLE);
        } else {
            holder.equalizer.stopBars();
            holder.equalizer.setVisibility(View.GONE);
        }

        if (arrayList.get(position).getArtist() != null) {
            holder.textView_catname.setText(arrayList.get(position).getArtist());
        } else {
            holder.textView_catname.setText(arrayList.get(position).getArtist());
        }

        holder.linearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                recyclerClickListener.onClick(holder.getAdapterPosition());
            }
        });

        holder.imageView_option.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                openOptionPopUp(holder.imageView_option, holder.getAdapterPosition());
            }
        });
    }

    @Override
    public long getItemId(int id) {
        return id;
    }

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

    public String getID(int pos) {
        return arrayList.get(pos).getId();
    }

    private void openOptionPopUp(ImageView imageView, final int pos) {
        PopupMenu popup = new PopupMenu(context, imageView);
        popup.getMenuInflater().inflate(R.menu.popup_song, popup.getMenu());
        if (type.equals("offline")) {
            popup.getMenu().findItem(R.id.popup_add_song).setTitle(context.getString(R.string.delete));
        }
        popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            public boolean onMenuItemClick(MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.popup_add_song:
                        if (type.equals("offline")) {
                            openDeleteDialog(pos);
                        } else {
                            jsonUtils.openPlaylists(arrayList.get(pos));
                        }
                        break;
                }
                return true;
            }
        });
        popup.show();
    }

    private void openDeleteDialog(final int pos) {
        AlertDialog.Builder dialog = new AlertDialog.Builder(context);
        dialog.setTitle(context.getString(R.string.delete));
        dialog.setMessage(context.getString(R.string.sure_delete));
        dialog.setPositiveButton(context.getString(R.string.delete), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Boolean isDelete = new File(arrayList.get(pos).getMp3Url()).delete();
                if (isDelete) {
                    arrayList.remove(pos);
                    notifyItemRemoved(pos);
                    Toast.makeText(context, context.getString(R.string.file_deleted), Toast.LENGTH_SHORT).show();
                }
            }
        });
        dialog.setNegativeButton(context.getString(R.string.cancel), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

            }
        });
        dialog.show();
    }

    public Filter getFilter() {
        if (filter == null) {
            filter = new NameFilter();
        }
        return filter;
    }

    private class NameFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {

            constraint = constraint.toString().toLowerCase();
            FilterResults result = new FilterResults();
            if (constraint.toString().length() > 0) {
                ArrayList<ItemSong> filteredItems = new ArrayList<>();

                for (int i = 0, l = filteredArrayList.size(); i < l; i++) {
                    String nameList = filteredArrayList.get(i).getMp3Name();
                    if (nameList.toLowerCase().contains(constraint))
                        filteredItems.add(filteredArrayList.get(i));
                }
                result.count = filteredItems.size();
                result.values = filteredItems;
            } else {
                synchronized (this) {
                    result.values = filteredArrayList;
                    result.count = filteredArrayList.size();
                }
            }
            return result;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {

            arrayList = (ArrayList<ItemSong>) results.values;
            notifyDataSetChanged();
        }
    }

和我的 XML 文件布局，我對 Recylcer 視圖和線性布局感到困惑

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="3dp"
    android:background="@color/black40"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/ll_songlist"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/imageView_songlist"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:layout_marginEnd="5dp"
            android:scaleType="centerCrop"/>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:id="@+id/textView_songname"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:maxLines="1"
                android:textColor="@color/white"
                android:textSize="15sp"
                android:layout_marginEnd="5dp"/>

            <TextView
                android:id="@+id/textView_catname"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:maxLines="1"
                android:text="sdasd"
                android:textColor="@color/white80"
                android:textSize="10sp"
                android:layout_marginBottom="10dp"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical">

                <RatingBar
                    android:id="@+id/ratingBar_songlist"
                    style="@style/RatingBar_white"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:max="5"
                    android:numStars="5"
                    android:theme="@style/RatingBar_white"/>

                <TextView
                    android:id="@+id/textView_totalrate_songlist"
                    android:layout_width="wrap_content"
                    android:layout_height="16dp"
                    android:layout_marginStart="5dp"
                    android:background="@drawable/bg_round_white"
                    android:paddingEnd="4dp"
                    android:paddingStart="4dp"
                    android:text="32"
                    android:textColor="@color/black"
                    android:textSize="10sp"
                    android:gravity="center"/>

            </LinearLayout>

        </LinearLayout>

        <es.claucookie.miniequalizerlibrary.EqualizerView xmlns:custom="http://schemas.android.com/apk/res-auto"
            android:id="@+id/equalizer_view"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_gravity="center"
            android:layout_marginEnd="7dp"
            android:layout_marginStart="7dp"
            android:visibility="invisible"
            custom:animDuration="3000"
            custom:foregroundColor="@color/pink" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="15dp"
            android:layout_marginEnd="35dp"
            android:orientation="vertical">

            <TextView
                android:id="@+id/textView_songduration"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="@color/white"
                android:textSize="12sp"
                android:text="asad"/>

        </LinearLayout>

    </LinearLayout>

    <ImageView
        android:id="@+id/imageView_option_songlist"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_alignParentEnd="true"
        android:layout_marginEnd="3dp"
        android:layout_marginTop="3dp"
        android:background="@drawable/bar_selector_white"
        android:src="@mipmap/more_option" />

    <LinearLayout
        android:id="@+id/ll_counts"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_marginEnd="15dp"
        android:orientation="horizontal"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:gravity="center">

        <ImageView
            android:layout_width="15dp"
            android:layout_height="wrap_content"
            android:src="@mipmap/views" />

        <TextView
            android:id="@+id/textView_views"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="2dp"
            android:gravity="center"
            android:text="25"
            android:textColor="@color/white"
            android:textSize="10sp" />

        <ImageView
            android:layout_width="15dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="6dp"
            android:src="@mipmap/download_arrow" />

        <TextView
            android:id="@+id/textView_downloads"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="2dp"
            android:gravity="center"
            android:text="25"
            android:textColor="@color/white"
            android:textSize="10sp" />
    </LinearLayout>

</RelativeLayout>

Answer 1

您在Fragment和Adapter為每個項目使用相同的布局R.layout.layout_songlist 。

在FragmentSongs的onCreateView方法中，問題在這里：

recyclerView = rootView.findViewById(R.id.ll_songlist);

因為在您使用的布局中：

<LinearLayout
    android:id="@+id/ll_songlist"

並且您不能將LinearLayout轉換為RecyclerView 。
在您的FragmentSongs您應該對RecyclerView使用不同的布局。