Question

我使用ListView使用mysql从wamp服务器显示我的数据，也使用JSON解析，以下是我的代码....

public class JSONTask extends AsyncTask<String, String, List<PumpModel>> {

    @Override
    protected List<PumpModel> doInBackground(String... params) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;
        try {
            URL url = new URL(params[0]);
            connection = (HttpURLConnection) url.openConnection();
            connection.connect();

            InputStream stream = connection.getInputStream();

            reader = new BufferedReader(new InputStreamReader(stream));
            StringBuffer buffer = new StringBuffer();
            String line = "";
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }

            String finalJSON = buffer.toString();
            JSONObject parentObject = new JSONObject(finalJSON);
            JSONArray parentArray = parentObject.getJSONArray("server_response");
            List<PumpModel> pumpModelList = new ArrayList<>();

            for (int i = 0; i < parentArray.length(); i++) {
                JSONObject finalObject = parentArray.getJSONObject(i);
                PumpModel pumpModel = new PumpModel();
                pumpModel.setPump(finalObject.getString("Pump"));
                pumpModel.setAvailable(finalObject.getString("Available"));
                pumpModelList.add(pumpModel);
            }
            return pumpModelList;


        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    @Override
    protected void onPostExecute(List<PumpModel> result) {
        super.onPostExecute(result);
        //TODO need to set the data to the list
        PumpAdapter adapter = new PumpAdapter(getApplicationContext(), R.layout.row, result);
        lvPump.setAdapter(adapter);
    }

}

public class PumpAdapter extends ArrayAdapter {
    private List<PumpModel> pumpModelList;
    private int resource;
    private LayoutInflater inflater;

    public PumpAdapter(Context context, int resource, List<PumpModel> objects) {
        super(context, resource, objects);
        pumpModelList = objects;
        this.resource = resource;
        inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = inflater.inflate(resource, null);
        }
        ImageView ivIcon;
        TextView tvPump;
        ivIcon = (ImageView) convertView.findViewById(R.id.ivIcon);
        tvPump = (TextView) convertView.findViewById(R.id.tvPump);
        // Then later, when you want to display image
        ImageLoader.getInstance().displayImage(pumpModelList.get(position).getAvailable(), ivIcon); // Default options will be used
        tvPump.setText(pumpModelList.get(position).getPump());
        return convertView;
    }
}

现在我想为列表视图创建一个onclick监听器，可以用来打开另一个活动，并在TextView中显示泵的描述。

Answer 1

在您的活动中，您定义了列表视图

你可以写

listview.setOnItemClickListener(new OnItemClickListener(){


@Override
public void onItemClick(AdapterView<?>adapter,View v, int position){

ItemClicked item = adapter.getItemAtPosition(position);

Intent intent = new Intent(Activity.this,destinationActivity.class);
//based on item add info to intent
startActivity(intent);

}


});

public ItemClicked getItem(int position){

return items.get(position);
}

Answer 2

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

                }
            });

Answer 3

在您的活动中，您定义了列表视图

你写了

listview.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?>adapter,View v, int position){
ItemClicked item = adapter.getItemAtPosition(position);
Intent intent = new Intent(Activity.this,destinationActivity.class);
//based on item add info to intent
startActivity(intent);
}


});

在适配器的getItem中编写

public ItemClicked getItem(int position){
    return items.get(position);
}

Answer 4

实施OnItemClickListener（适用于您的适配器的最佳位置）＆amp;在ListView对象setOnItemClickListener(yourItemClickListener);

上

参考： https://developer.android.com/reference/android/widget/AdapterView.OnItemClickListener.html

https://developer.android.com/reference/android/widget/AdapterView.html#setOnItemClickListener(android.widget.AdapterView.OnItemClickListener)

如何：为ListView创建onclick侦听器

4 个答案: