如何從數據庫到另一布局獲取特定行的所有列？

Question

我正在開發一個android項目，我想在其中獲取一行的所有列（特定條件）並將其拆分為TextViews。

我有一個ListView與項目：

起始頁布局

當我單擊列表視圖中的一項時，它將導航到另一種布局並將列表視圖項作為字符串傳遞：

public void Select()
{
    final ListView listView = (ListView) findViewById(R.id.ListViewMovie);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
    {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {
            final String details = listView.getAdapter().getItem(position).toString();

            Intent i = new Intent(getApplicationContext(), MovieDetailsActivity.class);
            i.putExtra("key", details);
            startActivity(i);

        }
    });
}

這是它導航到的另一個布局： MovieDetails布局

除此之外，我還有一個MovieRepository ：

public class MoviesRepository
{
    private SQLiteDatabase db;
    private MyDBHelper myDBHelper;
    Movie movie;

    private String [] MovieAllColumns ={Movie.COlUMN_ID,
            Movie.COlUMN_NAME};

    private String [] MovieColumns ={Movie.COlUMN_ID,
            Movie.COlUMN_NAME,
            Movie.COlUMN_GENRE,
            Movie.COlUMN_YEAR};

    public MoviesRepository(Context context)
    {
        myDBHelper = new MyDBHelper(context);
    }


    public void open() throws SQLException
    {
        //Open connection to write data
        db = myDBHelper.getWritableDatabase();
    }


    public void close()
    {
        //Close connection to database
        db.close();
    }

    private Movie cursorToMovie (Cursor cursor)
    {
        Movie movie = new Movie();
        movie.setId(cursor.getInt(0));
        movie.setName(cursor.getString(1));

        return movie;
    }

    public List<Movie> getAllMovies()
    {
        open();

        List<Movie> movieList = new ArrayList<>();
        Cursor cursor = db.query(Movie.TABLE_NAME, MovieAllColumns, null, null, null, null, null);
        cursor.moveToFirst();
        while (!cursor.isAfterLast())
        {
            Movie movie = cursorToMovie(cursor);
            movieList.add(movie);
            cursor.moveToNext();
        }

        cursor.close();
        close();
        return movieList;

    }



    public void Create(Movie movie)
    {
        open();

        //helps you insert values to the table
        ContentValues values = new ContentValues();

        //Put method - first column; what column do you want to be storing this ind. Second; what is the value you want to put ind
        values.put(Movie.COlUMN_NAME, movie.getName());
        values.put(Movie.COlUMN_GENRE, movie.getGenre());
        values.put(Movie.COlUMN_YEAR, movie.getYear());

        db.insert(Movie.TABLE_NAME, null, values);
        close();
    }


    public void Delete(Movie movie)
    {
        open();
        //Deletes Movie by id
        db.delete(Movie.TABLE_NAME, Movie.COlUMN_ID + " = " + movie.getId(), null);
        db.close();
    }

}

一個DBHelper

和電影模特：

    public class Movie
{
    // property to help us handle the data
    private int id;
    private String name;
    private String genre;
    private int year;


    //Getters and Setters of the properties
    public long getId()
    {
        return id;
    }

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


    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }


    public String getGenre()
    {
        return genre;
    }

    public void setGenre(String genre)
    {
        this.genre = genre;
    }


    public int getYear()
    {
        return year;
    }

    public void setYear(int year)
    {
        this.year = year;
    }


    public String toString()
    {
        return name;
    }



//----------Start--------- Here we have defined the table contents (basically a blueprint of the table Movie) -------------------------------------

    public static final String TABLE_NAME = "movie";
    public static final String COlUMN_ID = "id";
    public static final String COlUMN_NAME = "make";
    public static final String COlUMN_GENRE = "model";
    public static final String COlUMN_YEAR = "year";

//----------------------END----------------------------------------------------------------------------------------------------------------//

}

希望你們能幫助我弄清楚

Answer 1

您應該在適配器中保留數據列表（如果是電影，則為電影）。 然后將對象的ID而不是標題傳遞給另一個活動，以便能夠通過ID從數據庫查詢該對象。

Answer 2

您可以將整個對象傳遞給一個Activity並在那里檢索它。

通話活動：

final Movie details = listView.getAdapter().getItem(position);
Intent i = new Intent(getApplicationContext(), MovieDetailsActivity.class);
i.putExtra("key", details);

稱為Activity（這里是MovieDetailsActivity ）：

Intent intent = getIntent();
Movie details = (Movie)(intent.getExtras().getSerializable("key"));

注意，您必須使類Movie Serializable。

public class Movie implements Serializable