Question

我想将点击的项目数据从MainActivity转移到某些DetailActivity，以下是代码：

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);

    Intent intent = new Intent(MainActivity.this,TourDetailActivity.class);
    intent.putExtra("tourId", tours.get(position).getId());     
    startActivity(intent);
    }

这是适配器：

public class TourListAdapter extends ArrayAdapter<Tour> {

Context context;
List<Tour> tours;

public TourListAdapter(Context context, List<Tour> tours) {
    super(context, android.R.id.content, tours);
    this.context = context;
    this.tours = tours;
}

public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = vi.inflate(R.layout.list_item_tour, null);

    Tour tour = tours.get(position);

    TextView tv = (TextView) view.findViewById(R.id.titleText);
    tv.setText(tour.getTitle());

    tv = (TextView) view.findViewById(R.id.priceText);
    NumberFormat nf = NumberFormat.getCurrencyInstance();
    tv.setText(nf.format(tour.getPrice()));

    ImageView iv = (ImageView) view.findViewById(R.id.imageView1);
    int res = context.getResources().getIdentifier(
            tour.getImage(), "drawable", context.getPackageName());
    if (res != 0 ) {
        iv.setImageResource(res);
    }
    return view;
}

}

我知道问题是tours.get(position).getId()。但我不知道如何解决它感谢

Answer 1

如果你想通过intent在两个活动之间传递对象数据，你应该使用parcelable或Serializable。我使用Serializable做了这个样本。请试试这个。

Tour Custom对象类将是。

public class Tour implements Serializable{
String title;
String price;
int Image;

public String getTitle() {
    return title;
}

public int getImage() {
    return Image;
}

public void setImage(int image) {
    Image = image;
}

public void setTitle(String title) {
    this.title = title;
}

public String getPrice() {
    return price;
}

public void setPrice(String price) {
    this.price = price;
}

}

，你的数组适配器将是

public class Adapter extends ArrayAdapter<Tour> {

Context context;
List<Tour> tours;

public Adapter(Context context, List<Tour> tours) {
    super(context,R.layout.list_item_tour, tours);
    this.context = context;
    this.tours = tours;
}

public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = vi.inflate(R.layout.list_item_tour, null);

    Tour tour = tours.get(position);

    TextView tv = (TextView) view.findViewById(R.id.titleText);
    tv.setText(tour.getTitle());

    tv = (TextView) view.findViewById(R.id.priceText);
   /* NumberFormat nf = NumberFormat.getCurrencyInstance();
    tv.setText(nf.format(tour.getPrice()));
   */
     ImageView iv = (ImageView) view.findViewById(R.id.imageView1);
       /*int res = context.getResources().getIdentifier(
            tour.getImage(), "drawable", context.getPackageName());
    if (res != 0 ) {
        iv.setImageResource(res);
      }*/
      return view;
      }

     }

在您的第一个活动中，即在MainActivity中粘贴此代码。

   Adapter adapter=new Adapter(this,tours);
    listvView.setAdapter(adapter);
    listvView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            Tour tour=(Tour)listvView.getAdapter().getItem(i);
            Intent intent = new Intent(Demo.this,Demo2.class);
            intent.putExtra("tourId",tour);
            startActivity(intent);
        }
    });

并在你的第二个活动（即DetailActivity）中创建粘贴此代码

   Tour objects=(Tour)getIntent().getSerializableExtra("tourId");
    Log.e("Selected Tour title is ",objects.getTitle());

从ListView活动传输数据

1 个答案: