Wie übergeben Wert von unique_id zu einer anderen Aktivität in ListView verwendet werden

Question

Ich habe folgenden Code, in dem ich kämpfen, um Wert der eindeutigen ID aus den geparsten Daten von JSON an die DetailActivity.java übergeben. Ich möchte den Wert von unique_id von Mainactivity.java in DetailActivity.java als Parameter für die URL verwenden. Ich bin ein Neuling, also helfen Sie mir dabei. Ich stelle das Loch Mainactivity.java und DetailActivty.java

public class MainActivity extends AppCompatActivity { 

    private TextView text1; 
    private ListView lisView; 
    private ProgressDialog dialog; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     // Create default options which will be used for every 
     // displayImage(...) call if no options will be passed to this method 
     DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder() 
     .cacheInMemory(true) 
     .cacheOnDisk(true) 
     .build(); 
     ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()) 

     .defaultDisplayImageOptions(defaultOptions).build(); 
     ImageLoader.getInstance().init(config); // Do it on Application start 


     lisView = (ListView) findViewById(R.id.lvnews); 
     new JSONTask().execute("http://cricapi.com/api/cricket"); 
     Button button = (Button)findViewById(R.id.btn); 

     button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       new JSONTask().execute("http://cricapi.com/api/cricket"); 
      } 
     }); 

    } 


    public class JSONTask extends AsyncTask<String, String, List<NewsModel>> { 



     @Override 
     protected List<NewsModel> doInBackground(String... params) { 
      HttpURLConnection connection = null; 
      BufferedReader reader = null; 
      try { 
       URL url = new URL(params[0]); 
       connection = (HttpURLConnection) url.openConnection(); 
       connection.connect(); 

       InputStream stream = connection.getInputStream(); 

       reader = new BufferedReader(new InputStreamReader(stream)); 
       StringBuffer buffer = new StringBuffer(); 
       String line = ""; 
       while ((line = reader.readLine()) != null) { 
        buffer.append(line); 
       } 
       String finalJson = buffer.toString(); 

       JSONObject parentObject = new JSONObject(finalJson); 
       JSONArray parentArray = parentObject.getJSONArray("data"); 

       List<NewsModel> newsModelList = new ArrayList<>(); 

       for (int i = 0; i < parentArray.length(); i++) { 
        JSONObject finalObject = parentArray.getJSONObject(i); 
        NewsModel newsModel = new NewsModel(); 
        newsModel.setHeadline(finalObject.getString("unique_id")); 
        newsModel.setAuthor(finalObject.getString("description")); //   newsModel.setImage(finalObject.getString("Image")); 
        newsModel.setDescription(finalObject.getString("title")); 

        newsModelList.add(newsModel); 
       } 
       return newsModelList; 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } finally { 
       if (connection != null) { 
        connection.disconnect(); 
       } 
       try { 
        if (reader != null) { 
         reader.close(); 
        } 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 


      return null; 
     } 

     @Override 
     protected void onPostExecute(final List<NewsModel> result) { 
      super.onPostExecute(result); 
      if(result != null) { 
       final NewsAdapter newsAdapter = new NewsAdapter(getApplicationContext(), R.layout.row, result); 
       lisView.setAdapter(newsAdapter); 
       lisView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
        @Override 
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
         Intent intent = new Intent(MainActivity.this, DetailActivity.class); 
         startActivity(intent); 

        } 
       }); 
      } 
     } 
    } 

    public class NewsAdapter extends ArrayAdapter{ 

     public List<NewsModel> newsModelList; 
     private int resource; 
     private LayoutInflater inflater; 
     public NewsAdapter(Context context, int resource, List<NewsModel> objects) { 
      super(context, resource, objects); 
      newsModelList = objects; 
      this.resource = resource; 
      inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE); 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      ViewHolder holder = null; 
      if(convertView == null){ 
       holder = new ViewHolder(); 
       convertView = inflater.inflate(R.layout.row, null); 
       holder.headline = (TextView)convertView.findViewById(R.id.headlineview); 
       holder.author = (TextView)convertView.findViewById(R.id.authorview); 
       //holder.image = (ImageView)convertView.findViewById(R.id.imageView); 
       holder.description = (TextView)convertView.findViewById(R.id.descriptionview); 

       convertView.setTag(holder); 
      }else{ 
       holder = (ViewHolder) convertView.getTag(); 
      } 
       //holder.headline.setText(newsModelList.get(position).getHeadline()); 
       holder.author.setText(newsModelList.get(position).getAuthor()); 
       holder.description.setText(newsModelList.get(position).getDescription()); 



      return convertView; 
     } 

     private class ViewHolder { //   private ImageView image; 
      private TextView headline; 
      private TextView author; 
      private TextView description; 
     } 
    } 


} 

Nun zum DetailActivity in denen würde Ich mag als Parameter verwenden unique_id

public class DetailActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_detail); 
     // here I want to access that unique_id and pass it as id to url 
     //Example http://cricapi.com/api/cricketScore?unique_id=946765 
    } 
} 

Vielen Dank im Voraus URL

Answer 1

Sie verwenden können entweder bündeln (oder) direkt Sie können es durch die Absicht selbst senden. Unten ist der Code für Hauptaktivitätsklasse

lisView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
          @Override 
          public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
           Intent intent = new Intent(MainActivity.this, DetailActivity.class); 
           //Passing the values to another activty using a unique key.. 
           intent.putExtra("unique_id", newsModelList.get(position).getHeadline()); 
           startActivity(intent); 

          } 
        }); 

Jetzt im Detail Aktivität erhalten Sie die Werte mit Hilfe der gleichen eindeutigen Schlüssel.

Bundle bundle = getIntent().getExtras(); 
     if (bundle != null) { 
      String text = bundle.getString("unique_id"); 
     } 

Ich hoffe, dies ist hilfreich.

Answer 2

Im MainActivity können Sie die Werte in der Absicht, hinzufügen wie unten

Intent intent = new Intent(MainActivity.this, DetailActivity.class); 
intent.putString("unique_id", value); startActivity(intent); 

In der DetailActivity Sie den gleichen Wert in der onCreate Methode holen kann wie folgt

getIntent().getString("unique_id");