Question

我是android和stackoverflow上的新手，所以如果我在问题上犯了一些错误，请指导我。我的问题是，当我单击列表视图中的项目时，每个项目在下一个活动中都显示相同的内容。我有很多项目在列表视图中，我想使用列表中单击项的意图在下一个活动上发送poId，但是当我单击列表中的任何项时，poId是相同的（最后一次是我有3个项目，然后在每个项目中获得第三个项目的poId listview）上的每个项目。请告诉我如何获取可点击的poId并使用该位置的意图发送下一个活动，我的代码在这里，也请指导我并提供帮助：

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


                Intent intent = new Intent(POListActivity.this, PODetailsActivity.class);
                intent.putExtra("poId",poId);
                startActivity(intent);

        }
    });

这是我的asynctask，我从中获得poId

 private class GetPoList extends AsyncTask<String,String,String>{

    protected void onPreExecute() {
    }
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Override
    protected String doInBackground(String... strings) {
        ContentValues param= new ContentValues();
        param.put("buyerId", buyerId);
        JSONObject rootObj = parser.makeHttpRequest(Constants.URL_GET_PO_LIST, "GET", param);
        try {

            if (rootObj != null) {
                String status = rootObj.getString(Constants.SvcStatus);
                Log.d("Status",status);
                if (Constants.Success.equals(status)) {
                    JSONObject jsonObject = new JSONObject(String.valueOf(rootObj));
                    Log.d("PO_List ", jsonObject.toString());
                    JSONArray jsonArray = jsonObject.getJSONArray("lstPO");
                    for (int i = 0; i < jsonArray.length(); i++) {
                        JSONObject object = jsonArray.getJSONObject(i);
                        poId = object.getLong("poId");
                        poNo = object.getString("poNo");
                        deliveryDt = object.getString("deliveryDt");
                        metersCompleted = object.getInt("metersCompleted");
                        totalMeters = object.getInt("totalMeters");
                        comments = object.getString("comments");
                        hideStatus = object.getInt("hideStatus");
                        poListData = new PO(poNo, deliveryDt, metersCompleted, totalMeters, comments,hideStatus);
                        poListAdapter.add(poListData);
                    }
                } else {
                    Toast.makeText(POListActivity.this, "not Success", Toast.LENGTH_SHORT).show();
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();

        }
        catch(Exception e)
        {
        }
        return null;
    }
    protected void onPostExecute(String string){
        super.onPostExecute(string);
        lstPo.setAdapter(poListAdapter);
    }
}

Answer 1

您真的可以解决问题。问题是您在for loop中设置了poId。因此，该值将是最后一次迭代。

for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject object = jsonArray.getJSONObject(i);

    //poId will be override after each iteration
    poId = object.getLong("poId");

    poNo = object.getString("poNo");
    deliveryDt = object.getString("deliveryDt");
    metersCompleted = object.getInt("metersCompleted");
    totalMeters = object.getInt("totalMeters");
    comments = object.getString("comments");
    hideStatus = object.getInt("hideStatus");
    poListData = new PO(poNo, deliveryDt, metersCompleted, totalMeters, comments,hideStatus);
    poListAdapter.add(poListData);
}

所以我的解决方案是将poId存储在数组列表中：

// a class member
List<Long> poIds = new ArrayList<>();

在您的代码中：

for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject object = jsonArray.getJSONObject(i);

    //save ids inside List
    poIds.add(object.getLong("poId"));

    poNo = object.getString("poNo");
    deliveryDt = object.getString("deliveryDt");
    metersCompleted = object.getInt("metersCompleted");
    totalMeters = object.getInt("totalMeters");
    comments = object.getString("comments");
    hideStatus = object.getInt("hideStatus");
    poListData = new PO(poNo, deliveryDt, metersCompleted, totalMeters, comments,hideStatus);
    poListAdapter.add(poListData);
}

最后在侦听器中：

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

        Intent intent = new Intent(POListActivity.this, PODetailsActivity.class);
        //retrieve correct poId here
        intent.putExtra("poId",poIds.get(position));
        startActivity(intent);

    }
});

Answer 2

如果PO类没有poId，请添加它。

更改PO类构造函数以接受poId作为参数。

将poId的吸气剂添加到PO类。

在doInBackground方法中，将poId作为参数传递，以在其中创建PO类的新实例。

poListData = new PO(poId, poNo, deliveryDt, metersCompleted, totalMeters, comments,hideStatus);

在onItemClickListener中使用此：

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

            PO current = (PO) parent.getItemAtPosition(position);

            Intent intent = new Intent(POListActivity.this, PODetailsActivity.class);
            intent.putExtra("poId",current.getPoId());
            startActivity(intent);

    }
});

如何从位置onitemclick获取长值（poId）并在列表视图中通过意图onitemclick传递

2 个答案: