如何在Android中使用Intent调用下一个活动的方法

Question

What i am doing now is--> i'm getting data from the webservice in one activity and displaying the entire data in a listview. i added just a search functinality on the presented listview itself.

My requirement is --> i should have a search button in the first activity. When it is clicked, should show the related result in second activity, to do this added putExtras in the intent like this intent.putExtra("search", searchBox); that is the second activities search function keyword. but still m not getting the searched output.

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


StrictMode.ThreadPolicy policy = new      StrictMode.ThreadPolicy.Builder().permitAll().build();

StrictMode.setThreadPolicy(policy); 

final EditText searchBox=(EditText) findViewById(R.id.search);
final ListView  list=(ListView)findViewById(android.R.id.list);

//get the LayoutInflater for inflating the customomView
 //this will be used in the custom adapter
 inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);


  final  ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String,  String>>();
    // Creating JSON Parser instance
            final JSONParser jParser = new JSONParser();

            // getting JSON string from URL
            JSONObject json = jParser.getJSONFromUrl(URL);
            try {
                 posts = json.getJSONArray(KEY_POSTS);

    // looping through all song nodes <song>
            for(int i = 0; i < posts.length(); i++){
                JSONObject c = posts.getJSONObject(i);
                // Storing each json item in variable
                String id = c.getString(KEY_ID);
                String title = c.getString(KEY_TITLE);
                String date = c.getString(KEY_DATE);
                String content = c.getString(KEY_CONTENT);
                // to remove all <P> </p> and <br /> and replace with ""
                 content = content.replace("<br />", "");
                 content = content.replace("<p>", "");
                 content = content.replace("</p>", "");

                //authornumber is agin  JSON Object
                JSONObject author = c.getJSONObject(KEY_AUTHOR);
                String name = author.getString(KEY_NAME);

                String url = null;
                String slug = null;
                try {
                JSONArray atta = c.getJSONArray("attachments");
                for(int j = 0; j < atta.length(); j++){
                    JSONObject d = atta.getJSONObject(j);

                    slug = d.getString(KEY_SLUG);

                    JSONObject images = d.getJSONObject(KEY_IMAGES);

                    JSONObject thumbnail = images.getJSONObject(KEY_THUMB_URL);
                    url = thumbnail.getString(KEY_URL);

                }
                } catch (Exception e) {
                    e.printStackTrace();

                }

        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();

        // adding each child node to HashMap key => value
        map.put(KEY_ID, id);
        map.put(KEY_TITLE, title);
        map.put(KEY_DATE, date);
        map.put(KEY_NAME, name);
        map.put(KEY_CONTENT, content);
        map.put(KEY_SLUG, slug);
        map.put(KEY_URL, url);
   //                System.out.println("the map is title "+map.get("title"));
     //title2.add(map.get("title"));
        // adding HashList to ArrayList
        songsList.add(map);
            }   

            }catch (JSONException e) {
                e.printStackTrace();

                }


          //searchResults=OriginalValues initially
            searchResults=new ArrayList<HashMap<String, String>>(songsList);

     // Getting adapter by passing json data ArrayList
        adapter=new LazyAdapter(this, songsList);   

         list.setAdapter(adapter);


         searchBox.addTextChangedListener(new TextWatcher() {

             public void onTextChanged(CharSequence s, int start, int before, int count) {
               //get the text in the EditText
                searchString=searchBox.getText().toString();
                textLength=searchString.length();
               searchResults.clear();

               for(int i=0;i<songsList.size();i++)
               {
               playerName=songsList.get(i).get("title").toString();
              System.out.println("player name "+playerName);
              if(textLength<=playerName.length()){
              //compare the String in EditText with Names in the    ArrayList
                         if(searchString.equalsIgnoreCase(playerName.substring(0,textLength))){
                searchResults.add(songsList.get(i));
                System.out.println("the array list is "+songsList.get(i));
                adapter=new LazyAdapter(Home.this, searchResults);   

                 list.setAdapter(adapter);
                }

                  }

Answer 1

Intents are for activity and not methods inside them , So you cannot use it to call any specific method however you can use extras to figure out what you want to do \\

like after when you get extras from Intent you can ,

 if extras has "search" value 
 then do something about it