Question

你好朋友我是android新手，我正在学习android编程。我和朋友一起工作。我有网络服务，我在列表视图中显示城市列表现在我的朋友给我任务，当我点击城市然后该城市的ID返回我所以我不知道怎么做请任何人都可以帮助我这样做。

public class CityNameActivity extends ListActivity{
private TextView displayText;
ListView list;



private ProgressDialog pDialog;
// URL to get Cities JSON
private static String url = "http://14.140.200.186/Hospital/get_city.php";
// JSON Node names
private static final String TAG_CITIES = "Cities";
private static final String TAG_ID = "city_id";
private static final String TAG_NAME = "city_name";
// Cities JSONArray
JSONArray Cities = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> citylist;

//ArrayList<String> citylist;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.cityname_activity_main);

    ListView listView=getListView();

    citylist = new ArrayList<HashMap<String, String>>();

          new GetCities().execute();
}



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

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

    }

    @Override
    protected Void doInBackground(Void... arg0) {
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

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

        Log.d("Response: ", "> " + jsonStr);

        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                Cities = jsonObj.getJSONArray(TAG_CITIES);

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

                    String id = c.getString(TAG_ID);
                    String name = c.getString(TAG_NAME);
                    HashMap<String, String> Cities = new HashMap<String, String>();

                    Cities.put(TAG_ID, id);

                    Cities.put(TAG_NAME, name);



                    // adding contact to Cities list
                    citylist.add(Cities);


                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void result)
    {
        super.onPostExecute(result);
        // Dismiss the progress dialog
        if (pDialog.isShowing())
            pDialog.dismiss();
        /**`enter code here`
         * Updating parsed JSON data into ListView
         * */
        final ListAdapter adapter = new SimpleAdapter(CityNameActivity.this, citylist, R.layout.city_list_item, new String[] { TAG_NAME}, new int[] { R.id.name});
        setListAdapter(adapter);





    }
}}

cityname_mai_activity.xml

    <ListView
    android:id="@android:id/list"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView4" />
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Select City"
    android:id="@+id/textView4"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:textSize="25dp"/>

city_list_item：

<TextView
    android:id="@+id/name"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="2dip"
    android:paddingTop="6dip"
    android:textSize="16sp"
    android:textStyle="bold" />

Answer 1

您必须使用以下Picasso.get() .load(new File(imageStringUrl)) .into(iview);：

Spinner

使用spinner_item xml

    Spinner spin = (Spinner) findViewById(R.id.spinner);  


    spin.setOnItemSelectedListener(this);

    ArrayAdapter aa = new ArrayAdapter(this,R.layout.spinner_item,ARRAYLIST_DATA_HERE);  
    aa.setDropDownViewResource(R.layout.spinner_item); 

    //Setting the ArrayAdapter data on the Spinner  
    spin.setAdapter(aa); 

    spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {

               String items=spinner.getSelectedItem().toString();
               Log.i("Selected item : ",items);
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }

    });
    return true;

Answer 2

您为On Click Listener检查了ListView吗？我认为这样可以解决您的问题..在onClikcListener's事件上使用ItemClick会给您一个位置，根据该位置，您可以从Arraylist获取项目，该项目将为您提供{{1}从那...

如何返回listview所选项的id

2 个答案: