爲什麼我的recyclerview不顯示片段中的數據？

-1

我已經創建了在線壁紙應用程序，我用於活動我的應用程序，我使用凌空和滑翔爲我的應用程序，但是當我使用底部導航抽屜時，活動沒有用。後，我使用的片段，但現在當我運行的應用程序我recyclerview不顯示任何爲什麼我的recyclerview不顯示片段中的數據？

MainFragment.java：

package ir.zooding.wallpaper.activity; 

import android.Manifest; 
import android.app.ProgressDialog; 
import android.content.pm.PackageManager; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.support.design.widget.Snackbar; 
import android.support.v4.app.ActivityCompat; 
import android.support.v4.app.Fragment; 
import android.support.v7.app.AppCompatActivity; 
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.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.RelativeLayout; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.StringRequest; 

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

import java.util.ArrayList; 

import ir.zooding.wallpaper.R; 
import ir.zooding.wallpaper.adapter.GalleryAdapter; 
import ir.zooding.wallpaper.app.AppController; 
import ir.zooding.wallpaper.model.Image; 
import ir.zooding.wallpaper.receiver.ConnectivityReceiver; 

public class MainFragment extends Fragment implements  ConnectivityReceiver.ConnectivityReceiverListener { 

    RecyclerView recycler_view; 
    static final String url=""; 
    ArrayList<Image> images; 
    GalleryAdapter mAdapter; 
    ProgressDialog pd; 
    View v; 

    public static MainFragment newInstance() { 
MainFragment fragment = new MainFragment(); 
return fragment; 
    } 

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

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

v = inflater.inflate(R.layout.fragment_main, container, false); 


Toolbar toolbar=(Toolbar)v.findViewById(R.id.toolbar); 
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar); 

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


pd=new ProgressDialog(getActivity()); 
pd.setCancelable(false); 

images=new ArrayList<>(); 
mAdapter=new GalleryAdapter(getActivity().getApplicationContext(),images); 



RecyclerView.LayoutManager mLayoutManager=new GridLayoutManager(getActivity().getApplicationContext(),2); 
recycler_view.setLayoutManager(mLayoutManager); 


recycler_view.setAdapter(mAdapter); 
Log.i("LOG:","stop 1"); 





ActivityCompat.requestPermissions(getActivity(), 
    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 
    1); 

recycler_view.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getActivity().getApplicationContext(),recycler_view, new GalleryAdapter.ClickListener() { 
    @Override 
    public void onClick(View view, int position) { 

    Bundle bundle=new Bundle(); 
    bundle.putSerializable("images",images); 
    bundle.putInt("position",position); 
    //Log.i("LOG:",""+position); 



    // FragmentTransaction ft=getFragmentManager().beginTransaction(); 
    android.app.FragmentTransaction ft=getActivity().getFragmentManager().beginTransaction(); 

    SlideshowDialogFragment newFragment=SlideshowDialogFragment.newInstance(); 
    newFragment.setArguments(bundle); 
    newFragment.show(ft,"slideshow"); 


    } 

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

    } 
})); 


checkConnection(); 

fetchImages(); 



return inflater.inflate(R.layout.fragment_main, container, false); 
    } 

    @Override 
    public void onRequestPermissionsResult(int requestCode, 
            String permissions[], int[] grantResults) { 
switch (requestCode) { 
    case 1: { 

    // If request is cancelled, the result arrays are empty. 
    if (grantResults.length > 0 
     && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

     // permission was granted, yay! Do the 
     // contacts-related task you need to do. 
    } else { 

     // permission denied, boo! Disable the 
     // functionality that depends on this permission. 
     Toast.makeText(getActivity(), "دسترسی به حافظه داخلی لغو شد!!!", Toast.LENGTH_LONG).show(); 
    } 
    return; 
    } 

    // other 'case' lines to check for other 
    // permissions this app might request 
    } 
    } 



    public void fetchImages() 
    { 

pd.setMessage("در حال بارگزاری ..."); 
pd.show(); 


StringRequest req = new StringRequest(url, 
    new Response.Listener<String>() { 
    @Override 
    public void onResponse(String response) { 
     Log.d("", response.toString()); 
     pd.dismiss(); 

     images.clear(); 
     try { 
     JSONObject object = new JSONObject(response); 
     JSONArray dataArray = object.getJSONArray("data"); 

     for (int i = 0; i < dataArray.length(); i++) { 
      JSONObject dataObject = dataArray.getJSONObject(i); 

      Image image = new Image(); 
      image.setName_client(dataObject.getString("name_client")); 
      image.setName(dataObject.getString("name")); 

      // JSONObject url = object.getJSONObject("url"); 
      image.setSmall(dataObject.getString("small")); 
      image.setOriginal(dataObject.getString("orginal")); 
      image.setTimestamp(dataObject.getString("timestamp")); 

      images.add(image); 

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


     Log.i("LOG:","stop 2"); 

     mAdapter.notifyDataSetChanged(); 
     Log.i("LOG:","stop 3"); 

    } 
    }, new Response.ErrorListener() { 
    @Override 
    public void onErrorResponse(VolleyError error) { 
    Log.e("", "Error: " + error.getMessage()); 
    pd.dismiss(); 
    } 
}); 


AppController.getmInstance().addToRequsetQueue(req); 



    } 

    // Method to manually check connection status 
    private void checkConnection() { 
    boolean isConnected = ConnectivityReceiver.isConnected(); 
    showSnack(isConnected); 
    } 

    // Showing the status in Snackbar 
    private void showSnack(boolean isConnected) { 
String message =""; 
//View parentLayout = v.findViewById(android.R.id.content); 
RelativeLayout parentLayout = (RelativeLayout)v.findViewById(R.id.mroot); 

if (!isConnected) { 
    message = "اتصال شما به اینترنت برقرار نیست!"; 
    Snackbar snackbar = Snackbar 
    .make(parentLayout, message, Snackbar.LENGTH_LONG) 
    .setAction("بررسی مجدد", new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
     fetchImages(); 
     checkConnection(); 
     } 
    }); 
    snackbar.setActionTextColor(Color.RED); 
    snackbar.setActionTextColor(Color.parseColor("#e62d3f")); 
    View sbView = snackbar.getView(); 
    TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text); 
    textView.setTextColor(Color.parseColor("#FFC107")); 
    snackbar.setDuration(8000); 

    snackbar.show(); 
    } 


    } 

    @Override 
    public void onResume() { 
    super.onResume(); 

// register connection status listener 
AppController.getmInstance().setConnectivityListener(this); 
    } 

    /** 
    * Callback will be triggered when there is change in 
    * network connection 
    */ 
    @Override 
    public void onNetworkConnectionChanged(boolean isConnected) { 
    showSnack(isConnected); 
    } 
}

GalleryAdapter.java：

package ir.zooding.wallpaper.adapter; 

import android.content.Context; 
import android.support.v7.widget.RecyclerView; 
import android.view.GestureDetector; 
import android.view.LayoutInflater; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 

import com.bumptech.glide.Glide; 
import com.bumptech.glide.load.engine.DiskCacheStrategy; 

import java.util.List; 

import ir.zooding.wallpaper.R; 
import ir.zooding.wallpaper.model.Image; 

import static android.R.animator.fade_in; 


public class GalleryAdapter extends    RecyclerView.Adapter<GalleryAdapter.MyViewHolder> { 

List<Image> images; 
Context mContext; 

public GalleryAdapter (Context context,List<Image> images){ 

this.images = images; 
mContext = context; 

} 

@Override 
public GalleryAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int  viewType) { 
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.gallery_thumbnail,parent,false); 
return new MyViewHolder(view); 
} 

@Override 
public void onBindViewHolder(GalleryAdapter.MyViewHolder holder, int position) { 
Image image = images.get(position); 
Glide.with(mContext).load(image.getSmall()) 
    .thumbnail(0.5f) 
    .diskCacheStrategy(DiskCacheStrategy.ALL) 
    .placeholder(R.drawable.loading) 
    .fitCenter() 
    .into(holder.thumbnail); 






} 

@Override 
public int getItemCount() { 
return images.size(); 
} 

public interface ClickListener{ 

void onClick (View view,int position); 
void onLongClick (View view,int position); 


} 

public static class RecyclerTouchListener implements  RecyclerView.OnItemTouchListener{ 
GalleryAdapter.ClickListener clickListener; 
GestureDetector gestureDetector; 

public RecyclerTouchListener(Context context,final RecyclerView recyclerView,final GalleryAdapter.ClickListener clickListener){ 

    this.clickListener = clickListener; 

    gestureDetector = new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){ 

    @Override 
    public boolean onSingleTapUp(MotionEvent e){ 

     return true; 
    } 


    @Override 
    public void onLongPress(MotionEvent e){ 

     View child = recyclerView.findChildViewUnder(e.getX(),e.getY()); 
     if(child != null && clickListener != null){ 

     clickListener.onLongClick(child,recyclerView.getChildPosition(child)); 
     } 


    } 


    }); 

} 

@Override 
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { 



    View child = rv.findChildViewUnder(e.getX(),e.getY()); 
    if(child != null && clickListener != null&& gestureDetector.onTouchEvent(e)){ 

    clickListener.onClick(child,rv.getChildPosition(child)); 
    } 

    return false; 
} 

@Override 
public void onTouchEvent(RecyclerView rv, MotionEvent e) { 

} 

@Override 
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { 

} 
} 

public class MyViewHolder extends RecyclerView.ViewHolder{ 

ImageView thumbnail; 
public MyViewHolder(View view) { 
    super(view); 

    thumbnail =(ImageView) view.findViewById(R.id.thumbnail); 
} 
} 
}

MainActivity。 java：

package ir.zooding.wallpaper.activity; 

import android.support.annotation.NonNull; 
import android.support.design.widget.BottomNavigationView; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.view.MenuItem; 

import ir.adad.client.Adad; 
import ir.zooding.wallpaper.R; 

public class MainActivity extends AppCompatActivity { 



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

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

BottomNavigationView bottomNavigationView = (BottomNavigationView) 
    findViewById(R.id.navigation); 

bottomNavigationView.setOnNavigationItemSelectedListener 
    (new BottomNavigationView.OnNavigationItemSelectedListener() { 
    @Override 
    public boolean onNavigationItemSelected(@NonNull MenuItem item) { 
     Fragment selectedFragment = null; 
     switch (item.getItemId()) { 
     case R.id.action_item1: 
      selectedFragment = MainFragment.newInstance(); 
      break; 
     case R.id.action_item2: 
      selectedFragment = CategoryFragment.newInstance(); 
      break; 
     case R.id.action_item3: 
      selectedFragment = InfoFragment.newInstance(); 
      break; 
     } 
     FragmentTransaction transaction =  getSupportFragmentManager().beginTransaction(); 
     transaction.replace(R.id.frame_layout, selectedFragment); 
     transaction.commit(); 
     return true; 
    } 
}); 

//Manually displaying the first fragment - one time only 
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 
transaction.replace(R.id.frame_layout, MainFragment.newInstance()); 
transaction.commit(); 

//Used to select an item programmatically 
//bottomNavigationView.getMenu().getItem(2).setChecked(true); 

} 
}

fragment_main.xml：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true"> 

<RelativeLayout 
    android:id="@+id/mroot" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

</RelativeLayout> 

<android.support.design.widget.AppBarLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    > 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="?attr/colorPrimary" 

     /> 

</android.support.design.widget.AppBarLayout> 

<include 
    android:id="@+id/include" 
    layout="@layout/content_main"/>

content_main.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 

android:paddingTop="?attr/actionBarSize"> 


<android.support.v7.widget.RecyclerView 
    android:id="@+id/recycler_view" 
    android:layout_width="match_parent" 
    android:layout_height="0dp" 
    android:layout_weight="1" 
    android:scrollbars="vertical"/>

來源

2017-10-21 Masih Kolahdouzan

你採取了哪些調試步驟？視圖代碼是否完全達到？ – jdv

有你需要throught代碼Context小號的考慮。您可能會使用錯誤的Context的例子非常大Context s。比如從我可以看到它的快速之一就是這條線在MainFragment.java：

mAdapter=new GalleryAdapter(getActivity().getApplicationContext(),images);

您已通過應用程序上下文，而你只需要Context從活動。所以改爲：

mAdapter=new GalleryAdapter(getActivity(),images); // remove the method getApplicationContext

試着這樣做，如果它會工作，或者讓我們試着找到更多的代碼可能會帶來問題。

來源

2017-10-21 14:20:27 Xenolion

爲什麼我的recyclerview不顯示片段中的數據？

回答

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