Question

我正在开发一个Android项目，我希望获取一行的所有列（特定条件）并将它们拆分为TextViews。

我有一个包含项目的ListView：

当我点击listview中的一个项目时，它将导航到另一个布局并将listview项目作为字符串传递：

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);

        }
    });
}

这是导航到的其他布局： MovieDetails Layout

除此之外我还有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();
    }

}

DBHelper

电影模特：

    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----------------------------------------------------------------------------------------------------------------//

}

希望你们能帮助我弄清楚

Answer 1

您应该在适配器中保留数据列表（在您的案例中为电影）。然后传递不是标题，而是将对象的id传递给另一个活动，以便能够通过id从数据库中查询该对象。

Answer 2

您可以将整个对象传递给Activity并在那里检索它。

致电活动：

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

被叫活动（此处为MovieDetailsActivity）：

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

请注意，您必须使您的班级Movie可序列化。

public class Movie implements Serializable

如何将特定行的所有列从数据库获取到另一个布局？

2 个答案: