如何将JSON RSS提要解析为Android小部件

Question

please i need help, am a rookie, how can i create a widget that get its feed from from a Json in android. Is there a helpful tutorial that can help with this or a source code i can look at. I have checked online for a suitable tutorail but i found none that can help directly. this is the json url feed i want to pass into my android widget:url

public class MinistryNews extends SherlockListActivity {

private ActionBarMenu abm;
private ProgressDialog pDialog;

// URL to get contacts JSON
private static String url = "http://";

// JSON Node names
private static final String TAG_QUERY = "query";
private static final String TAG_ID = "id";
private static final String TAG_TITLE = "title";
private static final String TAG_CONTENT = "content";
// private static final String TAG_CAT_CODE = "cat_code";
// private static final String TAG_STATUS = "status";
// private static final String TAG_CREATED_TIME = "created_time";
private static final String TAG_UPDATE_TIME = "update_time";
// private static final String TAG_AUTHOR_ID = "author_id";

// contacts JSONArray
JSONArray query = null;

// Hashmap for ListView
ArrayList<HashMap<String, String>> queryList;

@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ministry_news);

    ActionBar actionbar = getSupportActionBar();
    actionbar.setDisplayHomeAsUpEnabled(true);
    abm = new ActionBarMenu(MinistryNews.this);

    if (com.cepfmobileapp.org.service.InternetStatus.getInstance(this)
            .isOnline(this)) {

        // Toast t = Toast.makeText(this,"You are online!!!!",8000).show();
        // Toast.makeText(getBaseContext(),"You are online",Toast.LENGTH_SHORT).show();
        // Calling async task to get json
        new GetQuery().execute();

    } else {
        // Toast.makeText(getBaseContext(),"No Internet Connection",Toast.LENGTH_LONG).show();
        // Toast t =
        // Toast.makeText(this,"You are not online!!!!",8000).show();
        // Log.v("Home",
        // "############################You are not online!!!!");
        AlertDialog NetAlert = new AlertDialog.Builder(MinistryNews.this)
                .create();
        NetAlert.setMessage("No Internet Connection Found! Please check your connection and try again!");
        NetAlert.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {

                // here you can add functions
                // finish();

            }
        });
        NetAlert.show();
    }

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

    ListView lv = getListView();

    // Listview on item click listener
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String name = ((TextView) view.findViewById(R.id.title))
                    .getText().toString();

            String cost = ((TextView) view.findViewById(R.id.time))
                    .getText().toString();

            String description = ((TextView) view
                    .findViewById(R.id.content)).getText().toString();
            // String plain = Html.fromHtml(description).toString();

            // description.replace(/<\/?[^>]+>/gi, '');
            // Starting single contact activity
            Intent in = new Intent(getApplicationContext(),
                    SingleActivity.class);
            in.putExtra(TAG_TITLE, name);
            in.putExtra(TAG_UPDATE_TIME, cost);
            in.putExtra(TAG_CONTENT, description);
            startActivity(in);

        }
    });

    // Calling async task to get json
    // new GetQuery().execute();
}

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

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        pDialog = new ProgressDialog(MinistryNews.this);
        pDialog.setMessage("Please wait..Loading news");
        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
                query = jsonObj.getJSONArray(TAG_QUERY);

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

                    String id = c.getString(TAG_ID);
                    String title = c.getString(TAG_TITLE);
                    String content = c.getString(TAG_CONTENT);
                    String update_time = c.getString(TAG_UPDATE_TIME);
                    // String address = c.getString(TAG_ADDRESS);
                    // String gender = c.getString(TAG_GENDER);

                    // Phone node is JSON Object
                    // JSONObject phone = c.getJSONObject(TAG_PHONE);
                    // String mobile = phone.getString(TAG_PHONE_MOBILE);
                    // String home = phone.getString(TAG_PHONE_HOME);
                    // String office = phone.getString(TAG_PHONE_OFFICE);

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

                    // adding each child node to HashMap key => value
                    contact.put(TAG_ID, id);
                    contact.put(TAG_TITLE, title);
                    contact.put(TAG_CONTENT, content);
                    contact.put(TAG_UPDATE_TIME, update_time);
                    // contact.put(TAG_PHONE_MOBILE, mobile);

                    // adding contact to contact list
                    queryList.add(contact);
                }
            } 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();
        /**
         * Updating parsed JSON data into ListView
         * */
        ListAdapter adapter = new SimpleAdapter(MinistryNews.this,
                queryList, R.layout.list_item, new String[] { TAG_TITLE,
                        TAG_UPDATE_TIME, TAG_CONTENT }, new int[] {
                        R.id.title, R.id.time, R.id.content });

        setListAdapter(adapter);
    }

}

Answer 1

签出GSON库 ，该库将创建具有JSON内容的Java对象，并在您的小部件中使用它

Answer 2

here is a nice tutorial for you to import json data http://mrbool.com/how-to-use-json-to-parse-data-into-android-application/28944 if its hard for you still.i can suggest you one thing ,you can import your rss to any website and customize it there as you want it to be and post them as json data it will be easier to do i guess. its a raugh test for geting json data only the method i think its a bit easier and detail u can return the values instead of showing them in a text from the textvw

public void getdata()
{
    String result=null;
    InputStream inputstream=null;
    try{
        HttpClient httpclient=new DefaultHttpClient();
        HttpPost httppost=new HttpPost("http://www.hadid.aero/news_and_json");
        HttpResponse response=httpclient.execute(httppost);
        HttpEntity httpentity=response.getEntity();
        inputstream= httpentity.getContent();
    }
    catch(Exception ex)
    {
        resultview.setText(ex.getMessage()+"at 1st exception");
    }
    try{
        BufferedReader reader=new BufferedReader(new InputStreamReader(inputstream,"iso-8859-1"),8);
        StringBuilder sb=new StringBuilder();
        String line=null;
        while((line=reader.readLine())!= null)                  
        {
            sb.append(line +"\n");
        }
        inputstream.close();
        result=sb.toString();
    }
    catch(Exception ex)
    {
        resultview.setText(ex.getMessage()+"at 2nd exception");
    }
    try{
        String s="test :";
        JSONArray jarray=new JSONArray(result);
        for(int i=0; i<jarray.length();i++)
        {
            JSONObject json=jarray.getJSONObject(i);
            s= s +"+json.getString("lastname")+"\n"+
                    "newsid&title : "+json.getString("id_news")+" "+json.getString("title")+"\n"+
                    "date :"+json.getString("date")+"\n"+
                    "description : "+json.getString("description");
        }
        resultview.setText(s);
    }
    catch(Exception ex)
    {
        this.resultview.setText(ex.getMessage()+"at 3rd exception");
    }