Rückrufe von einer anderen Klasse

Question

Ich habe versucht, Methoden auf der Hauptaktivität von einer anderen Klasse aufzurufen. Aber die Methoden sind nicht gelöst. Schau dir den Code an.

package com.example.android.andhive_glideimagelib.activity; 

import android.app.ProgressDialog; 
import android.media.Image; 
import android.os.Bundle; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.DefaultItemAnimator; 
import android.support.v7.widget.GridLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 

import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.JsonArrayRequest; 
import com.example.android.andhive_glideimagelib.R; 
import com.example.android.andhive_glideimagelib.adapter.GalleryAdapter; 
import com.example.android.andhive_glideimagelib.app.AppController; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 

public class MainActivity extends AppCompatActivity { 

    private String TAG = MainActivity.class.getSimpleName(); 
    private static final String endpoint = "http://api.androidhive.info/json/glide.json"; 
    private ArrayList<Image> images; 
    private ProgressDialog pDialog; 
    private GalleryAdapter mAdapter; 
    private RecyclerView recyclerView; 

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

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     recyclerView = (RecyclerView) findViewById(R.id.recycler_view); 

     pDialog = new ProgressDialog(this); 
     images = new ArrayList<>(); 
     mAdapter = new GalleryAdapter(getApplicationContext(), images); 

     RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getApplicationContext(), 2); 
     recyclerView.setLayoutManager(mLayoutManager); 
     recyclerView.setItemAnimator(new DefaultItemAnimator()); 
     recyclerView.setAdapter(mAdapter); 

     recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getApplicationContext(), recyclerView, new GalleryAdapter.ClickListener() { 
      @Override 
      public void onClick(View view, int position) { 
       Bundle bundle = new Bundle(); 
       bundle.putSerializable("images", images); 
       bundle.putInt("position", position); 

       FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
       SlideshowDialogFragment newFragment = SlideshowDialogFragment.newInstance(); 
       newFragment.setArguments(bundle); 
       newFragment.show(ft, "slideshow"); 
      } 

      @Override 
      public void onLongClick(View view, int position) { 

      } 
     })); 

     fetchImages(); 
    } 

    private void fetchImages() { 

     pDialog.setMessage("Downloading json..."); 
     pDialog.show(); 

     JsonArrayRequest req = new JsonArrayRequest(endpoint, 
       new Response.Listener<JSONArray>() { 
        @Override 
        public void onResponse(JSONArray response) { 
         Log.d(TAG, response.toString()); 
         pDialog.hide(); 

         images.clear(); 
         for (int i = 0; i < response.length(); i++) { 
          try { 
           JSONObject object = response.getJSONObject(i); 
           Image image = new Image(); 
           image.setName(object.getString("name")); 

           JSONObject url = object.getJSONObject("url"); 
           image.setSmall(url.getString("small")); 
           image.setMedium(url.getString("medium")); 
           image.setLarge(url.getString("large")); 
           image.setTimestamp(object.getString("timestamp")); 

           images.add(image); 

          } catch (JSONException e) { 
           Log.e(TAG, "Json parsing error: " + e.getMessage()); 
          } 
         } 

         mAdapter.notifyDataSetChanged(); 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e(TAG, "Error: " + error.getMessage()); 
       pDialog.hide(); 
      } 
     }); 

     // Adding request to request queue 
     AppController.getInstance().addToRequestQueue(req); 
    } 
} 

Die Klasse,

package com.example.android.andhive_glideimagelib.model; 

import java.io.Serializable; 

public class Image implements Serializable { 
    private String name; 
    private String small, medium, large; 
    private String timestamp; 

    public Image() { 
    } 

    public Image(String name, String small, String medium, String large, String timestamp) { 
     this.name = name; 
     this.small = small; 
     this.medium = medium; 
     this.large = large; 
     this.timestamp = timestamp; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getSmall() { 
     return small; 
    } 

    public void setSmall(String small) { 
     this.small = small; 
    } 

    public String getMedium() { 
     return medium; 
    } 

    public void setMedium(String medium) { 
     this.medium = medium; 
    } 

    public String getLarge() { 
     return large; 
    } 

    public void setLarge(String large) { 
     this.large = large; 
    } 

    public String getTimestamp() { 
     return timestamp; 
    } 

    public void setTimestamp(String timestamp) { 
     this.timestamp = timestamp; 
    } 
} 

ich die Methoden der Image-Klasse nicht aufrufen können. Danke für die Hilfe !

Answer 1

in der Bildklasse machen es statische Methode Beispiel:

public static void setSmall (String small) {

this.small = klein; }

in MainActivity Image.setSmall ("Wert");