Dynamisch unterschiedlichen Inhalt (aus JSON) für jedes Tab-Fragment generieren

Question

Wie kann ich für jedes neu generierte Fragment dynamisch unterschiedlichen Inhalt (aus der JSON-Struktur) setzen?

Das ist mein MainActivity Code, ich Informationen über Bundle mit dem Fragment bin vorbei:

public class MainActivity extends AppCompatActivity { 
private Toolbar toolbar; 
private TabLayout tabLayout; 
private ViewPager viewPager; 
private GridView gridView; 

String myData = ""; 

public static String test; 

//Fragment List 
private final List<Fragment> mFragmentList = new ArrayList<>(); 
//Title, Soups, Alcohol, Salads Lists 
public final List<String> mFragmentTitleList = new ArrayList<>(); 
public final List<String> soupsList = new ArrayList<>(); 
public final List<String> alcDrinksList = new ArrayList<>(); 
public final List<String> saladsList = new ArrayList<>(); 
public final List<String> randomList = new ArrayList<>(); 
private ViewPagerAdapter adapter; 

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

    toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    viewPager = (ViewPager) findViewById(R.id.viewpager); 
    //gridView = (GridView) findViewById(R.id.gridView); 

    loaddata(); 
    tabLayout = (TabLayout) findViewById(R.id.tabs); 
} 

//Loading the JSON data, which will be used to create dynamically content such as tabs and info for the Fragments 
private void loaddata() { 
    RequestQueue queue = Volley.newRequestQueue(this); 
    String url = 
      "https://ipfs.io/ipfs/QmQ69ScwoqSsFAdGV4oUKNaDMzSDuY9zcdRoFYkHPUZM7E"; 
    String line = ""; 

    StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() { 
     @Override 
     public void onResponse(String response) { 
      myData = response; 

      JSONArray soupsArray = null; 
      JSONArray alcDrinksArray = null; 
      JSONArray saladsArray = null; 
      JSONArray randomArray = null; 
      //Log.d("response", myData); 



      JSONObject object = null; 
      try { 
       object = new JSONObject(myData); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      JSONObject menuitems = null; 
      try { 
       menuitems = object.getJSONObject("menuitems"); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      try { 
       alcDrinksArray = menuitems.getJSONArray("Alcohol Drinks"); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      for(int i = 0; i < alcDrinksArray.length(); i++) { 
       try { 
        alcDrinksList.add(String.valueOf(alcDrinksArray.getJSONObject(i).get("name"))); 
        Log.d("alcDrinksList", alcDrinksList.toString()); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 

      try { 
       soupsArray = menuitems.getJSONArray("Soups"); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      for(int i = 0; i < soupsArray.length(); i++) { 
       try { 
        soupsList.add(String.valueOf(soupsArray.getJSONObject(i).get("name"))); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 

      try { 
        saladsArray = menuitems.getJSONArray("Salads"); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      for(int i = 0; i < saladsArray.length(); i++) { 
       try { 
        saladsList.add(String.valueOf(saladsArray.getJSONObject(i).get("name"))); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 

      for (int i = 0; i < menuitems.length(); i++) { 
       try { 
        mFragmentTitleList.add(menuitems.names().getString(i)); 

        Bundle bundle = new Bundle(); 
//here I should pass dynamically created ArrayList<String> with data (e.g. different alcohol drinks, soups, salads, etc...) for the Fragment... 
        bundle.putStringArrayList("data", (ArrayList<String>) alcDrinksList); 
        Log.d("bundletest", alcDrinksList.toString()); 
        mFragmentList.add(new OneFragment()); 
        mFragmentList.get(i).setArguments(bundle); 

        //mFragmentTitleList gives output [Alcohol Drinks, Soups, Salads] 
        Log.d("test", String.valueOf(mFragmentTitleList)); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
       //Log.d(TAG, "Key = " + menuitems.names().getString(i) + " value = " + menuitems.get(menuitems.names().getString(i))); 
      } 

      setupViewPager(viewPager); 
      //setupGridView(gridView); 
      tabLayout.setupWithViewPager(viewPager); 
      // Tab ViewPager setting 
      viewPager.setOffscreenPageLimit(mFragmentList.size()); 
      tabLayout.setupWithViewPager(viewPager); 

     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Context context = getApplicationContext(); 
      int duration = Toast.LENGTH_SHORT; 
      Toast.makeText(context, "That didn't work!", duration); 
     } 
    }); 
    queue.add(stringRequest); 
} 

private void setupViewPager(ViewPager viewPager) { 
    adapter = new ViewPagerAdapter(getSupportFragmentManager(), mFragmentList, mFragmentTitleList); 
    viewPager.setAdapter(adapter); 
} 

/*private void setupGridView(GridView gridView) { 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, alcDrinksList); 
    gridView = (GridView) findViewById(R.id.gridView); 
    gridView.setAdapter(adapter); 
}*/ 

//ViewPagerAdapter settings 
class ViewPagerAdapter extends FragmentPagerAdapter { 
    private List<Fragment> mFragmentList = new ArrayList<>(); 
    private List<String> mFragmentTitleList = new ArrayList<>(); 

    public ViewPagerAdapter(FragmentManager fm, List<Fragment> fragments, List<String> titleLists) { 
     super(fm); 
     this.mFragmentList = fragments; 
     this.mFragmentTitleList = titleLists; 
    } 

    @Override 
    public Fragment getItem(int position) { 
     return mFragmentList.get(position); 
    } 

    @Override 
    public int getCount() { 
     return mFragmentList == null ? 0 : mFragmentList.size(); 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return mFragmentTitleList.get(position); 
    } 

} 

} 

Das ist mein Fragment Klasse:

public class OneFragment extends Fragment { 
private List<String> contentList = new ArrayList<>(); 
ArrayAdapter<String> adapter; 
GridView gridView; 

public OneFragment() { 
    // Required empty public constructor 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    contentList = getArguments().getStringArrayList("data"); 
    Log.d("contentList", contentList.toString()); 

    View view = inflater.inflate(R.layout.fragment_one, null); 

    gridView = (GridView) view.findViewById(R.id.gridView); 
    adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, contentList); 
    gridView.setAdapter(adapter); 

    return view; 
} 
} 

Im Moment habe ich die Alkohol alle Getränke haben auf jedes Fragment. Ich weiß, dass ich es statisch einstellen kann/durch den Aufruf der JSON-Namen ... /, es wäre viel einfacher, aber ich möchte, dass meine App skalierbar und Open Source ist, deshalb möchte ich alles dynamisch erstellen (laut JSON-Datei übergeben :)).

am Ende So sollte ich Tab/Alkoholische Getränke/mit den alkoholischen Getränken Tab/Suppen haben/mit den Suppen Tab/Salate/mit den Salaten ...

Answer 1

Änderung Ihrer OneFragment Konstruktor dieser Weg.

von dieser

public OneFragment() { 
// Required empty public constructor 
} 

Um

public OneFragment(Context context,ArrayList<String> contentList) { 
    this.context = context; 
    this.contentList = contentList ; 
} 

Änderung OneFragmentonCreate() für direkten contentList holen wie Salat Liste, Suppe Liste, die in setsetupViewPager() wie unten Code hinzugefügt werden

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    //contentList will get data from constructor 
    Log.d("contentList", contentList.toString()); 

    View view = inflater.inflate(R.layout.fragment_one, null); 

    gridView = (GridView) view.findViewById(R.id.gridView); 
    adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, contentList); 
    gridView.setAdapter(adapter); 

    return view; 
} 

Fügen Sie diese Methode zu Ihrem ViewPagerAdapter hinzu.

public void addFrag(Fragment fragment, String title) { 
     mFragmentList.add(fragment); 
     mFragmentTitleList.add(title); 
} 

und Änderung

von diesem

public ViewPagerAdapter(FragmentManager fm, List<Fragment> fragments, List<String> titleLists) { 
    super(fm); 
    this.mFragmentList = fragments; 
    this.mFragmentTitleList = titleLists; 
} 

Um

public ViewPagerAdapter(FragmentManager fm) { 
    super(fm); 
} 

Jetzt für ViewPagerAdapter Konstruktor machen machen andere 3 erforderlich Fragment nach Ihrem Bedarf. d.Salad, Suppen usw. wie OneFragment und übergeben Sie diese Daten, entfernen Sie für Schleife, wo Sie Bundle bundle = new Bundle(); und alle Daten hinzufügen. direkt hinzufügen wie folgt in setupViewPager(). ändern Methode wie folgt.

private void setupViewPager(ViewPager viewPager) { 
    adapter = new ViewPagerAdapter(getSupportFragmentManager()); 

    adapter.addFrag(new OneFragment(context,alcDrinksList)); 
    adapter.addFrag(new SaladFragment(context,saladsArray)); 
    adapter.addFrag(new SoupFragment(context,soupsArray)); 
    viewPager.setAdapter(adapter); 
} 

Hope this helfen.