Question

我得到arrayIndexOutOfBound异常，如果数组的大小在适配器中为零，在行holder.checkbox.setChecked(bmpArray.get(position).isChecked());中给出错误

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

问题出在这里

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

应该 return 0 而不是 return 3

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

如果您在bmpArray中有明确的价值，请直接使用return bmpArray.size()

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

或者，如果您从loadAll或Fragment设置Activity，那么您应该使用GridSellerAdapter.notifyDataSetChanged();而不是更新getCount()中的值。但是，bmpArray的值已从其加载其值的Activity或Fragment更改后。

Answer 2

在getCount（）方法中你写了这样的条件。

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

}

如果loadall为true / false，则bmpArray不应为null。根据loadall值，您尝试加载值。如果loadall值设置为false，那么你试图加载有限的值。总是你应该在bmpArrray中有值。

检查这样的情况..

@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;
           }

        }
}

想在Gridview中使用固定数量的图像

2 个答案: