Question

我正在开发一个Android应用，它以Json的形式从网站获取数据，它有100个ListView数据。我想获取每个OnClickListener的每个自动收报机值。我的代码如下：

public class MainActivity extends AppCompatActivity {

private String TAG = MainActivity.class.getSimpleName();

private ProgressDialog pDialog;
private ListView lv;

// URL to get contacts JSON
private static String url = "https://api.coinmarketcap.com/v1/ticker/?convert=INR&limit=100";

ArrayList<HashMap<String, String>> contactList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    contactList = new ArrayList<>();

    lv = (ListView) findViewById(R.id.list);

    new GetContacts().execute();

    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String id1 = ((TextView)view.findViewById(R.id.name)).getText().toString();
            Intent intent = new Intent(MainActivity.this,ViewCoinActivity.class);
            intent.putExtra("id",id1);
            startActivity(intent);

        }
    });
}



/**
 * Async task class to get json by making HTTP call
 */
private class GetContacts extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Loading....");
        pDialog.setCancelable(false);
        pDialog.show();

    }


    @Override
    protected Void doInBackground(Void... arg0) {
        HttpHandler sh = new HttpHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url);

        Log.e(TAG, "Response from url: " + jsonStr);

        if (jsonStr != null) {
            try {
                JSONArray json = new JSONArray(jsonStr);

                // Getting JSON Array node


                // looping through All Contacts
                for (int i = 0; i < json.length(); i++) {
                    JSONObject c = json.getJSONObject(i);

                    String id = c.getString("id");
                    String name = c.getString("name");
                    String symbol = c.getString("symbol");
                    String price_inr = c.getString("price_inr");
                    String percent_change_24h = c.getString("percent_change_24h");
                   String market_cap_inr = c.getString("market_cap_inr");
                    String rank = c.getString("rank");
                    // Phone node is JSON Object
                  /*  JSONObject phone = c.getJSONObject("phone");
                    String mobile = phone.getString("mobile");
                    String home = phone.getString("home");
                    String office = phone.getString("office"); */

                    // tmp hash map for single contact
                    HashMap<String, String> contact = new HashMap<>();

                    // adding each child node to HashMap key => value
                    contact.put("id", id);
                    contact.put("name", name);
                    contact.put("symbol", symbol);
                    contact.put("price_inr", price_inr);
                    contact.put("percent_change_24h", percent_change_24h);
                    contact.put("market_cap_inr", market_cap_inr);
                    contact.put("rank", rank);
                    // adding contact to contact list
                    contactList.add(contact);
                }
            } catch (final JSONException e) {
                Log.e(TAG, "Json parsing error: " + e.getMessage());
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Json parsing error: " + e.getMessage(),
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });

            }
        } else {
             Log.e(TAG, "Couldn't get json from server.");
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(),
                            "Couldn't get Data from Server",
                            Toast.LENGTH_LONG)
                            .show();
                }
            });

        }

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        // Dismiss the progress dialog
        if (pDialog.isShowing())
            pDialog.dismiss();
        /**
         * Updating parsed JSON data into ListView
         * */
        ListAdapter adapter = new SimpleAdapter(
                MainActivity.this, contactList,
                R.layout.list_item, new String[]{"name","symbol",
                "price_inr","percent_change_24h","market_cap_inr","rank"}, new int[]{R.id.name,
                R.id.symbol,R.id.price_inr,R.id.percent_change_24h,R.id.market_cap_inr,R.id.rank});

        lv.setAdapter(adapter);
    }

}

}

对于每个onclick我想根据自动收报机从以下内容中获取数据 https://api.coinmarketcap.com/v1/ticker/bitcoin/

https://api.coinmarketcap.com/v1/ticker/ethereum/

Answer 1

抱歉，但也许我不明白你的问题。但是为了获得onItemClickListener的值，您只需在项目位置使用联系人列表。适配器的相同列表。喜欢这个

 lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String id1 = contactList.get(position).getIdMethod();
        Intent intent = new Intent(MainActivity.this,ViewCoinActivity.class);
        intent.putExtra("id",id1);
        startActivity(intent);

    }
});

如何获取每个OnClickListener的json数据？

1 个答案: