Question

我已经完成了自定义列表视图它每行有6个textview和1个图像视图什么是按下项目它只是进入我的第二个活动但它想要的是将行的项目传递给第二个活动我不知道该怎么做或在列表或适配器中添加它的位置还有在第二个活动中做什么

这是我的第一个活动

public class ImageListActivity extends AppCompatActivity {

private DatabaseReference mDatabaseRef;
private List<ImageUpload> imgList;
private ListView lv;
private ImageListAdapter adapter;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_list);
    imgList = new ArrayList<>();
    lv = (ListView) findViewById(R.id.listViewImage);
    //Show progress dialog during list image loading
    progressDialog = new ProgressDialog(this);
    progressDialog.setMessage("Please wait loading list image...");
    progressDialog.show();

    mDatabaseRef = FirebaseDatabase.getInstance().getReference(ListActivity.FB_Database_Path);



            mDatabaseRef.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    progressDialog.dismiss();

                    //Fetch image data from firebase database
                    for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                        //ImageUpload class require default constructor
                        ImageUpload img = snapshot.getValue(ImageUpload.class);
                        imgList.add(img);
                    }


                    //Init adapter
                    adapter = new ImageListAdapter(ImageListActivity.this, R.layout.image_item, imgList);
                    //Set adapter for listview
                    lv.setAdapter(adapter);
                }


                @Override
                public void onCancelled(DatabaseError databaseError) {

                    progressDialog.dismiss();
                }

            });
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            Intent myintent = new Intent(view.getContext(), Buy1Activity.class);
            startActivityForResult(myintent, 0);


        }
    });


}
}

这是适配器

public class ImageListAdapter extends ArrayAdapter<ImageUpload> {
private Activity context;
private int resource;
private List<ImageUpload> listImage;

public ImageListAdapter(@NonNull Activity context, @LayoutRes int resource, @NonNull List<ImageUpload> objects) {
    super(context, resource, objects);
    this.context = context;
    this.resource = resource;
    listImage = objects;
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();

    View v = inflater.inflate(resource, null);
    TextView tvName = (TextView) v.findViewById(R.id.tvImageName);
    TextView tvModel = (TextView) v.findViewById(R.id.tvImageModel);
    TextView tvBrand = (TextView) v.findViewById(R.id.tvImageBrand);
    TextView tvPrice = (TextView) v.findViewById(R.id.tvImagePrice);
    TextView tvyear = (TextView) v.findViewById(R.id.tvImageYear);
    TextView tvDesc = (TextView) v.findViewById(R.id.tvImageDesc);
    ImageView img = (ImageView) v.findViewById(R.id.imgView);

    tvModel.setText(listImage.get(position).getModel());
    tvName.setText(listImage.get(position).getName());
    tvBrand.setText(listImage.get(position).getBrand());
    tvyear.setText(listImage.get(position).getYear());
    tvDesc.setText(listImage.get(position).getDesc());
    tvPrice.setText(listImage.get(position).getPrice());

    Glide.with(context).load(listImage.get(position).getUrl()).into(img);

    return v;

}

}

Answer 1

据我所知，您希望传输整个对象，即您单击的列表项的ImageUpload。为此，您可以将ImageUpload模型类创建为Parcelable，然后在您的意图中传递选定的ImageUpload对象，并使用getParcelable（）从Intent中检索它。

列表项上的

单击：

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        Intent myintent = new Intent(view.getContext(), Buy1Activity.class);
        myintent.putExtra("selected_image_upload", ((ImageUpload) adapter.getItem(position)));
        startActivityForResult(myintent, 0);
    }
});

在Buy1Activity上

，在onCreate（）中获取所选的ImageUpload对象：

ImageUpload imgUploadObj = getIntent().getExtras().getParcelable("selected_image_upload");

您可以从here获取提示以创建Parcelable类。

Answer 2

试试这个

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        ImageUpload img = adapter.get(position);
        Intent myintent = new Intent(view.getContext(), Buy1Activity.class);
        myintent.putParcelableArrayListExtra("parcel_data", img);
        startActivityForResult(myintent, 0);
    }
});

在您的Buy1Activity中

@Override
protected void onCreate(Bundle savedInstanceState) {
  ImageUpload img = (ImageUpload) getIntent().getParcelableArrayListExtra("parcel_data");
}

希望有所帮助！

自定义列表视图将多个数据传递到下一个活动

2 个答案: