【发布时间】：2016-05-06 07:14:53
【问题描述】：
例如，我正在尝试从两个不同的 HTTP 请求 获取数据并添加到单个列表视图中。
在上图中，我从不同的 HTTP REQUESTS 获取数据和来自不同 HTTP REQUESTS 的图像，我还想将图像用作 ViewPager 在这个 Listview
这是我尝试过的代码。
ArrayList<home_listview_model> restaurant_Array_list;
home_listadapter home_listadapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
restaurant_Array_list = new ArrayList<home_listview_model>();
new get_restaurant_data().execute("http://example.com/api/restaurant");
ListView listview = (ListView)findViewById(R.id.home_list);
home_listadapter = new home_listadapter(getApplicationContext(), R.layout.home_list_view, restaurant_Array_list);
listview.setAdapter(home_listadapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,long id) {
Toast.makeText(getApplicationContext(), restaurant_Array_list.get(position).getRestaurant_name(), Toast.LENGTH_LONG).show();
}
});
}
这是我的 get_restaurant_data AsyncTask 代码
public class get_restaurant_data extends AsyncTask<String, Void, Boolean> {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(home.this);
dialog.setMessage("Loading... please wait");
dialog.show();
dialog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... urls) {
try {
//------------------>>
HttpGet httppost = new HttpGet(urls[0]);
httppost.addHeader( "food-api-key" , "***********" );
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
// StatusLine stat = response.getStatusLine();
int status = response.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("restaurant_list_data");
for (int i = 0; i < jarray.length(); i++) {
JSONObject jsonrealobject = jarray.getJSONObject(i);
home_listview_model lisviewarray = new home_listview_model();
lisviewarray.setRestaurant_id(jsonrealobject.getString("restaurant_id"));
lisviewarray.setRestaurant_name(jsonrealobject.getString("restaurant_name"));
lisviewarray.setRestaurant_address(jsonrealobject.getString("address"));
lisviewarray.setRestaurant_opping_time(jsonrealobject.getString("restaurant_opping_time"));
restaurant_Array_list.add(lisviewarray);
}
return true;
}
//------------------>>
} catch (ParseException | IOException | JSONException e1) {
e1.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result) {
dialog.cancel();
home_listadapter.notifyDataSetChanged();
if(result == false){
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
}
}
}
这是我的 home_listview_model 代码
package com.example.nhp04.gqfood;
public class home_listview_model {
private String restaurant_id;
private String restaurant_name;
private String restaurant_address;
private String restaurant_opping_time;
public home_listview_model() {
}
public home_listview_model(String restaurant_id, String restaurant_opping_time, String restaurant_address, String restaurant_name, String restaurant_images ) {
super();
this.restaurant_id = restaurant_id;
this.restaurant_opping_time = restaurant_opping_time;
this.restaurant_address = restaurant_address;
this.restaurant_name = restaurant_name;
}
public String getRestaurant_id() {
return restaurant_id;
}
public void setRestaurant_id(String restaurant_id) {
this.restaurant_id = restaurant_id;
}
public String getRestaurant_opping_time() {
return restaurant_opping_time;
}
public void setRestaurant_opping_time(String restaurant_opping_time) { this.restaurant_opping_time = restaurant_opping_time;}
public String getRestaurant_address() {return restaurant_address;}
public void setRestaurant_address(String restaurant_address) { this.restaurant_address = restaurant_address;}
public String getRestaurant_name() { return restaurant_name; }
public void setRestaurant_name(String restaurant_name) {this.restaurant_name = restaurant_name;}
}
这是我的 home_listadapter 代码
public class home_listadapter extends ArrayAdapter<home_listview_model> {
String resturantid;
ArrayList<home_listview_model> restaurant_Array_list;
LayoutInflater vi;
int Resource;
ViewHolder holder;
Context mContext;
public home_listadapter(Context context, int resource, ArrayList<home_listview_model> objects) {
super(context, resource, objects);
vi = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
restaurant_Array_list = objects;
mContext = context;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// convert view = design
View v = convertView;
if (v == null) {
holder = new ViewHolder();
v = vi.inflate(Resource, null);
// holder.restaurant_images = (ImageView)v.findViewById(R.id.restaurant_images);
holder.restaurant_id = (TextView)v.findViewById(R.id.restaurant_id);
holder.restaurant_name = (TextView)v.findViewById(R.id.restaurant_name);
holder.restaurant_address = (TextView)v.findViewById(R.id.address);
holder.restaurant_opping_time = (TextView)v.findViewById(R.id.opningtime);
// view the other function for OnclickListener
holder.bookmark = (ImageButton)v.findViewById(R.id.imgbtn_bookmark);
holder.share = (ImageButton)v.findViewById(R.id.share_btn);
holder.dismiss = (ImageButton)v.findViewById(R.id.dismiss_btn);
holder.add_to_list = (ImageButton)v.findViewById(R.id.add_to_list_btn);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
holder.restaurant_id.setText(restaurant_Array_list.get(position).getRestaurant_id());
holder.restaurant_name.setText(restaurant_Array_list.get(position).getRestaurant_name());
holder.restaurant_address.setText(restaurant_Array_list.get(position).getRestaurant_address());
holder.restaurant_opping_time.setText("Opens at " + restaurant_Array_list.get(position).getRestaurant_opping_time());
return v;
}
static class ViewHolder {
public TextView restaurant_id;
public TextView restaurant_name;
public TextView restaurant_address;
public TextView restaurant_opping_time;
}
}
从上面的代码我得到正确的结果
{
"restaurant_list_data": [
{
"restaurant_id": "1",
"restaurant_name": "Huynh Restaurant ",
"categories": "",
"address": "912 St. Emanuel St",
"city": "Houston",
"state": "TX",
"zipcode": "77003",
"subdivision": "Downtown, EaDo",
"phone": "(713) 224-8964",
"restaurant_opping_time": "11am",
"crate_time_stamp": "2016-04-15 15:10:00",
"update_time_stamp": "0000-00-00 00:00:00"
}
]
}
现在我想通过 id 获取这家餐厅的图片，我的下一个 HTTP REQUEST 网址已准备好，但我不知道应该在哪里调用下一个 HTTP REQUEST要获取图像，我的下一个 HTTP REQUEST 网址是
http://example.com/api/restaurantimages/"+resturantid
【问题讨论】：
标签： java android multithreading listview android-studio