在片段机器人实施的AsyncTask [英] implement AsyncTask in Fragment android
问题描述
我有一个活动从一个列表,其中输出JSON数据。但现在我想在一个片段来实现它。 在这个片段我想认为这是GridView控件。而这两个文件能正常工作。但是当我试图执行的AsyncTask我得到几个redflags为不可达code。有人可以帮我这个好吗?
I've an activity which output json data from as a list. But now I want to implement it in a fragment. In this fragment I want to view it as gridview. And both files works fine. but when I tried to implement AsyncTask I gets several redflags as unreachable code. Can someone help me with this please?
编辑:新
public class SalesFragment extends Fragment {
GridView gridView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View gv = inflater.inflate(R.layout.hot_sales, null);
gridView = (GridView) gv.findViewById(R.id.grid_view);
bindGridview();
return gv;
}
public void bindGridview() {
new MyAsyncTask(getActivity(),gridView).execute("");
}
class MyAsyncTask extends AsyncTask<String, String, String> {
GridView mGridView;
Activity mContext;
Response response;
public MyAsyncTask(Activity context,GridView gview) {
this.mGridView=gview;
this.mContext=context;
}
protected String doInBackground(String... params) {
File file = new File( Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/sample.txt");
if(file.exists()) {
try{
Reader inputStreamReader = new InputStreamReader(new FileInputStream(file));
Gson gson = new Gson();
this.response = gson.fromJson(inputStreamReader, Response.class);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (@SuppressWarnings("hiding") IOException e){
e.printStackTrace();
}
}else{
System.out.println("Error");
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
//List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();
for(Sales sales : this.response.sales){
HashMap<String, String> hm = new HashMap<String,String>();
if (sales.getCategories1().contains("12")){
//hm.put("sale_title", "" + sales.getShort_title());
for(Shop shop : this.response.shops){
String image_file = new String( Environment.getExternalStorageDirectory().getAbsolutePath()
+ "/images/" + shop.getImage());
if(shop.getId().equals(sales.getShop_id())){
hm.put("shop_image", image_file );
System.out.println(shop_image);
}
}
if(hm.size()>0){
gridView.setAdapter(new ImageAdapter(MainActivity.this,R.layout.grid_layout , imgArray, titleArray));
}
}
}
}
}
}
如何调用图像到GridView控件上面的图片?请大家帮帮忙。
How to call images into gridview on above image? Please help.
推荐答案
有简单的步骤,以箱asyntask片段中
There is easy step to crate asyntask within fragment
在你的片段到位$ C $关于 activityCreateview
in your fragment place code on activityCreateview
new MyAsyncTask(getActivity(), mListView).execute("");
getActivity()
的方法,片段和活动进行沟通
getActivity()
is method to communicate with fragment and activity
在asynstak上后
in asynstak on post
context.mListView.setArrayAdapter(...........)
在这里
public class SalesFragment extends Fragment {
GridView gridView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View gv = inflater.inflate(R.layout.hot_sales, null);
gridView = (GridView) gv.findViewById(R.id.grid_view);
bindGridView()
return gv;
//return super.onCreateView(inflater, container, savedInstanceState);
}
public void bindGridview()
{
new MyAsyncTask(getActivity(), gridView).execute("");
}
class MyAsyncTask extends AsyncTask<String, String, String>
{
GridView mGridView;
Activity mContex;
public MyAsyncTask(Activity contex,GridView gview)
{
this.mGridView=gview;
this.mContex=contex;
}
protected String doInBackground(String... params)
{
//fetch data
}
@Override
protected void onPostExecute(String result) {
{
for(Sales sales : this.response.sales){
HashMap<String, String> hm = new HashMap<String,String>();
if (sales.getCategories1().contains("12")){
//hm.put("sale_title", "" + sales.getShort_title());
for(Shop shop : this.response.shops){
String image_file = new String( Environment.getExternalStorageDirectory().getAbsolutePath()
+ "/images/" + shop.getImage());
if(shop.getId().equals(sales.getShop_id())){
hm.put("shop_image", image_file );
System.out.println(shop_image);
}
}
}
}
if(hm.size()>0)
mcontext.mGridView.setAdapter(new ImageAdapter(mContext),hm);
}
取数据之前,使它像建模
before fetching data make it model like
public class ImageModel
{
String title;
String img;
}
ArrayList<ImageModel> arrayList=new ArrayList<ImageModel>();
填充数组列表所需的数据 那么
fill array list with required data then
mcontext.mGridView.setAdapter(new ImageAdapter(mContext),hm,arrayList);
//in image adapter
public class ImageAdapter extends ArrayAdapter<String> {
public ImageAdapter(Context context, HashMap<String, String> hm,ArrayList<ImageModel> images )
{
super(context, R.layout.activity_t);
}
//--code
}
使用哈希映射适配器并分配有位置的图像 集数据,并且可以从模型值
use hash map in adapter and assign images with position set data and fetch value from model
这篇关于在片段机器人实施的AsyncTask的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!