Question

我需要从SQLite检索单击的RecyclerView项的数据，并将其显示在新的Fragment中。该数据包括图像URL，该URL也需要在该片段中显示。找不到有关该操作的信息。我正在尝试使用单击项的ID检索数据（该ID传递给Fragment）。

我尝试将ImageView添加到Fragment的布局中，但这似乎并不是这样做的方法。

适配器

public class MoviesAdapter extends RecyclerView.Adapter<MoviesAdapter.RowViewHolder> {

    private Context context;
    private List<Movie> movieList;

    private FragmentTransaction ft;

    public MoviesAdapter(Context context, FragmentManager fm) {

        this.context = context;
        movieList = new ArrayList<>();
    }

    @NotNull
    @Override
    public RowViewHolder onCreateViewHolder(@NotNull ViewGroup parent, int viewType) {

        View itemView = LayoutInflater.from(context)
                .inflate(R.layout.row_list_movies, parent,false);

        return new RowViewHolder(itemView);
    }

    class RowViewHolder extends RecyclerView.ViewHolder {

        TextView viewTitle;
        TextView viewReleaseYear;

        LinearLayout movieEntry;

        RowViewHolder(View view) {

            super(view);
            viewTitle = view.findViewById(R.id.title);
            viewReleaseYear = view.findViewById(R.id.releaseYear);
            movieEntry = view.findViewById(R.id.eventsListRowId);
        }
    }

    @Override
    public void onBindViewHolder(@NotNull RowViewHolder holder, int position) {

        final Movie currentMovie = movieList.get(position);

        holder.viewTitle.setText(movieList.get(position).getTitle());
        holder.viewReleaseYear.setText(String.valueOf(movieList.get(position).getReleaseYear()));
        holder.movieEntry.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                toMovieDetailsFragment(currentMovie, v);
            }
        });
    }

    private void toMovieDetailsFragment(Movie currentMovie, View v) {

        AppCompatActivity activity = (AppCompatActivity) v.getContext();
        int id = currentMovie.getMovieId();

        Fragment mdf = new MovieDetailsFragment();

        Bundle movieBundle = new Bundle();
        movieBundle.putInt("id", id);

        mdf.setArguments(movieBundle);
        Log.d("Monitoring", "Going to MovieDetailsFragment");

        activity.getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.fragments_container, mdf)
                .addToBackStack(null)
                .commit();
    }

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

    public void attachMoviesList(List<Movie> movieList) {
        // getting list from Fragment.
        this.movieList = movieList;
//        notifyDataSetChanged();
    }
}

需要在其中显示信息的片段

public class MovieDetailsFragment extends Fragment{

    Movie movie;

    int movieId;

    GetDatabase getDatabase;

    @Nullable
    @Override
    public View onCreateView(@NotNull LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_details_movie, container, false);

        Bundle idBundle = getArguments();
        if (idBundle != null) {
            movieId = getArguments().getInt("id");
        }

        movie = new GetDatabase(getActivity()).getMovieDetails(movieId);

//        movie = Movie.getCurrentMovie();
        return rootView;
    }

    public void setMovie(Movie movie){
        this.movie = movie;
    }
}

从SQLite检索点击项数据的方法

    public Movie getMovieDetails(int movieId) {

        Movie movie = new Movie();
        String sqlQuery = "SELECT * FROM " + TABLE_NAME +" WHERE id="+"'"+movieId+"'";
        open();
        Cursor cursor = db.rawQuery(sqlQuery, null);

        try
        {
            if(cursor.getCount() > 0)
            {
                while (!cursor.isAfterLast()) {
                    movie.setMovieId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(Movie.ID))));
                    movie.setTitle(cursor.getString(cursor.getColumnIndex(Movie.TITLE)));
                    movie.setImage(cursor.getString(cursor.getColumnIndex(Movie.IMAGE_URL)));
                    movie.setRating(cursor.getDouble(cursor.getColumnIndex(Movie.RATING)));
                    movie.setReleaseYear(cursor.getInt(cursor.getColumnIndex(Movie.RELEASE_YEAR)));
                    movie.setGenre(cursor.getString(cursor.getColumnIndex(Movie.GENRE)));

                    cursor.moveToNext();
                }
            }
            else
            {
                cursor.close();
            }
        }
        catch(Exception ex)
        {
            Log.e("Error", "Look at Class's Method");
            Log.e("Error", ex.toString());
        }
        return movie;
    }

显示列表的片段

public class MoviesListFragment extends Fragment implements ScanResultReceiver {

    private TextView formatTxt, contentTxt;

    Context context;

    MoviesAdapter moviesAdapter;
    RecyclerView moviesRV;

    FragmentManager fm;
    private FragmentTransaction ft;

    Button addBtn;

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_list_movies, container, false);

        Log.i(TAG,"In moviesListFragment");

        context = getActivity();

        addBtn = rootView.findViewById(R.id.addBtnId);

        formatTxt = rootView.findViewById(R.id.scan_format);
        contentTxt = rootView.findViewById(R.id.scan_content);

        Bundle listBundle = getArguments();
        if (listBundle != null) {

            ArrayList<Movie> moviesList = getArguments().getParcelableArrayList("moviesList");
            if (moviesList != null) {

                LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
                moviesAdapter = new MoviesAdapter(context, fm);

                moviesRV = rootView.findViewById(R.id.moviesRVId);
                moviesRV.setLayoutManager(linearLayoutManager);
                moviesRV.setHasFixedSize(true);

                moviesAdapter.attachMoviesList(moviesList);

                DividerItemDecoration dividerItemDecoration =
                        new DividerItemDecoration(context, linearLayoutManager.getOrientation());
                moviesRV.addItemDecoration(dividerItemDecoration);
                moviesRV.setAdapter(moviesAdapter);
            }
        }

        addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
        return rootView;
    }

    @Override
    public void scanResultData(String codeFormat, String codeContent){
        // display it on screen
        formatTxt.setText(String.format("FORMAT: %s", codeFormat));
        contentTxt.setText(String.format("CONTENT: %s", codeContent));
        Log.i("Monitoring: ", formatTxt+" "+contentTxt);
    }

    @Override
    public void scanResultData(NoScanResultException noScanData) {
        Toast toast = Toast.makeText(context,noScanData.getMessage(), Toast.LENGTH_SHORT);
        toast.show();
    }
}

列表片段的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:clipChildren="false"
    android:clipToPadding="false"
    >

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

        <TextView
            android:id="@+id/scan_format"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textIsSelectable="true"
            android:gravity="center_horizontal"
            android:layout_marginBottom="@dimen/alertBtnMargin" />
        <TextView
            android:id="@+id/scan_content"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textIsSelectable="true"
            android:layout_marginBottom="@dimen/alertBtnMargin"
            android:gravity="center_horizontal" />
        <LinearLayout android:layout_height="wrap_content"
            android:layout_width="match_parent" />
        <LinearLayout
            android:layout_weight="500"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.RecyclerView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/moviesRVId"
                android:layout_margin="@dimen/dimen_10" />

        </LinearLayout>
        <LinearLayout
            android:layout_weight="1"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <Button
                android:id="@+id/addBtnId"
                android:textSize="@dimen/btnTxtSize"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:text="@string/addAMovie" />
        </LinearLayout>

    </LinearLayout>

    <!--<include layout="@layout/change_name" />-->
</android.support.constraint.ConstraintLayout>

谢谢。

在RecyclerView列表中从sqlite onClick检索图像URL

0 个答案: