Möchten feste Anzahl der Bilder in Gridview

Question

I Ausnahme bin immer arrayIndexOutOfBound verwenden, wenn Größe des Arrays Null-Adapter ist, Fehler in Zeile geben holder.checkbox.setChecked(bmpArray.get(position).isChecked());

package com.algosoft.zobazar;  

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.CheckBox; 
import android.widget.CompoundButton; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 

import com.algosoft.library.GridItem; 
import com.algosoft.library.ImageData; 
import com.algosoft.library.ImageLoader; 

import java.util.ArrayList; 
import java.util.HashMap; 

/** 
* Created by ADMIN on 4/9/2016. 
*/ 
public class GridSellerAdapter extends ArrayAdapter<String> { 
    private Context context; 
    private ArrayList<ImageData> bmpArray; 
    private ImageLoader2 imageLoader; 
    private int width; 
    private LayoutInflater inflater; 
    protected int visibleFlag; 
    public boolean longFlag; 
    public HashMap<String, String> hmp; 
    private LinearLayout btnDeleteLayout; 
    private boolean loadAll = false; 
    public GridSellerAdapter(Activity camera, ArrayList<ImageData>  selectedSongs, LinearLayout btnDeleteLayout) { 
     super(camera, R.layout.activity_seller__upload_product); 
     this.context = camera; 
     this.bmpArray = selectedSongs; 
     this.btnDeleteLayout = btnDeleteLayout; 
     width = ScreenDensity.Width(context); 
     imageLoader = new ImageLoader2(camera.getApplicationContext(),width/3,width/3); 
     inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     visibleFlag = View.GONE; 
     longFlag = false; 
     hmp = new HashMap<String, String>(); 
     btnDeleteLayout.setVisibility(View.GONE); 
    } 


    public void setTrue(){ 
     loadAll = true; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     if(loadAll) return bmpArray.size(); 
     return 3; 

    } 
    class ViewHolder { 
     ImageView imageview; 
     CheckBox checkbox; 
     int id; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     final ViewHolder holder; 
     if (convertView == null) { 
      holder = new ViewHolder(); 
      convertView = inflater.inflate(
        R.layout.multiple_files_choice, null); 
      holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage); 
      holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox); 
      convertView.setTag(holder); 
     } 
     else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 
     holder.checkbox.setId(position); 
     holder.imageview.setId(position); 
     holder.checkbox.setTag(position); 
     holder.imageview.setTag(position); 
     holder.checkbox.setTag(position); 
     holder.imageview.setOnClickListener(null); 
     holder.imageview.setOnLongClickListener(null); 
     holder.checkbox.setOnCheckedChangeListener(null); 
     holder.checkbox.setChecked(bmpArray.get(position).isChecked()); 
     imageLoader.DisplayImage(bmpArray.get(position).getPath(), holder.imageview); 
     holder.id = position; 
     holder.imageview.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       if(longFlag){ 
        if(!holder.checkbox.isChecked()){ 
         holder.checkbox.setChecked(true); 
         hmp.put(bmpArray.get(position).getPath(), bmpArray.get(position).getPath()); 
         if(hmp.size()>0) 
          btnDeleteLayout.setVisibility(View.VISIBLE); 
        }else{ 
         holder.checkbox.setChecked(false); 
         hmp.remove(bmpArray.get(position)); 
         if(hmp.size()<1) 
          btnDeleteLayout.setVisibility(View.GONE); 
        } 
       } 
       else{ 
        Intent i = new Intent(context, MyGallery.class); 
        i.putExtra("position", position); 
        context.startActivity(i); 
        ((Activity) context).overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_left); 
       } 
      } 
     }); 
     holder.imageview.setOnLongClickListener(new View.OnLongClickListener() { 

      @Override 
      public boolean onLongClick(View arg0) { 
       // TODO Auto-generated method stub 
       if(!longFlag){ 
        hmp.clear(); 
        holder.checkbox.setChecked(true); 
        hmp.put(bmpArray.get(position).getPath(), bmpArray.get(position).getPath()); 
        longFlag = true; 
        visibleFlag = View.VISIBLE; 
        notifyDataSetChanged(); 
       } 
       return false; 
      } 
     }); 
     holder.checkbox.setVisibility(visibleFlag); 
     holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
       // TODO Auto-generated method stub 
       int getPosition = (Integer) buttonView.getTag(); 
       bmpArray.get(getPosition).setChecked(buttonView.isChecked()); 
       if(isChecked){ 
        hmp.put(bmpArray.get(position).getPath(), bmpArray.get(position).getPath()); 
        if(hmp.size()>0) 
         btnDeleteLayout.setVisibility(View.VISIBLE); 
       }else{ 
        hmp.remove(bmpArray.get(position).getPath()); 
        if(hmp.size()<1) 
         btnDeleteLayout.setVisibility(View.GONE); 
       } 
      } 
     }); 
     return convertView; 
    } 
} 

Answer 1

Das Problem hier ist

@Override 
public int getCount() { 
     // TODO Auto-generated method stub 
     if(loadAll) return bmpArray.size(); 
     return 3; 
} 

es sollte sein return 0 anstelle von return 3

@Override 
public int getCount() { 
      // TODO Auto-generated method stub 
      if(loadAll) return bmpArray.size(); 
      return 0; 
} 

sonst, wenn Sie bestimmten Wert in bmpArray direkt return bmpArray.size()

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

verwenden Oder wenn Sie loadAll setzen aus, es ist Fragment oder Activity dann sollten Sie GridSellerAdapter.notifyDataSetChanged(); statt Aktualisieren von Werten in getCount() verwenden. Aber nachdem Werte von bmpArray von seinem Activity oder Fragment geändert wurden, wo Sie seinen Wert laden.

Answer 2

In getCount() -Methode schreiben Sie Bedingung wie diese.

@Override 
public int getCount() { 
    // TODO Auto-generated method stub 
    if(loadAll) return bmpArray.size(); 
    return 3; 

} 

Wenn loadall wahr/falsch ist, sollte das bmpArray nicht null sein. Basierend auf dem Ladewert versuchen Sie, die Werte zu laden. Wenn loadall value auf false gesetzt ist, haben Sie versucht, begrenzte Werte zu laden. Sie sollten immer die Werte in bmpArrray haben.

Überprüfen Sie den Zustand wie folgt ..

@Override 
public int getCount() { 
    // TODO Auto-generated method stub 
    if(loadAll){ 
      return bmpArray.size(); 
    }else{ 
     if(bmpArray.size()<3){ 

       return bmpArray.size(); 
      }else{ 
        return 3; 
      } 

     } 
}