在List视图中将数据作为数组存储时,索引是否超出范围?

时间:2017-06-14 18:15:50

标签: android listview android-studio

您好我试图将数据从我的数据库存储为数组,然后我将使用它为myadapter创建一个自定义的列表视图,但是我的索引超出此范围。

这是我的代码,用于从我的数据库中检索数据以将其存储为数组(主要活动)

int[] avatarImage = {R.mipmap.blademaster,R.mipmap.gunslinger,R.mipmap.pyro}; 
//i didnt store my image to my database because i dont know how to store and retrieve it so i use manual array

List<Avatar>values = db.getAllAvatars();
        int countOfValues = values.size();
        String[] titles = new String[countOfValues];

        for (int i=0; i<=countOfValues; i++) {
            titles[i] = (String)values.get(i).getName();
        }

listView = (ListView) findViewById(R.id.avatarlv);

        MyAdapter myAdapter = new MyAdapter(MainActivity.this,titles,avatarImage);
        listView.setAdapter(myAdapter);

我的适配器java

public class MyAdapter extends ArrayAdapter<String> {

    String [] names;
    int [] avatarImage;
    Context mContext;

    public MyAdapter(Context context,String[] nama,int[] aImage) {
        super(context, R.layout.adapter_main);
        this.names = nama;
        this.avatarImage = aImage;
        this.mContext = context;
    }

    @Override
    public int getCount()
    {
        return names.length;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder mViewHolder = new ViewHolder();
        if(convertView == null) {
            LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.adapter_main, parent, false);
            mViewHolder.mAvatar = (ImageView) convertView.findViewById(R.id.imageView);
            mViewHolder.mName = (TextView) convertView.findViewById(R.id.textView);
            convertView.setTag(mViewHolder);
        }
        else {
            mViewHolder = (ViewHolder) convertView.getTag();
        }
        mViewHolder.mAvatar.setImageResource(avatarImage[position]);
        mViewHolder.mName.setText(names[position]);

        return convertView;
    }

    static class ViewHolder{
        ImageView mAvatar;
        TextView mName;
    }

}

但是当我运行它时“java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.gorila.sqlite_grid_view / com.example.gorila.AvatarShop.MainActivity}:java.lang.IndexOutOfBoundsException:索引4无效,大小是4“

请帮助,谢谢。

2 个答案:

答案 0 :(得分:1)

在你的this.avatarImage中,你只有3个元素,但是在getView中,如果位置为4则尝试得到这个mViewHolder.mAvatar.setImageResource(avatarImage[position]);,它将给出IndexOutOfBoundsException。

为了测试只是评论该行并运行,它将正常工作。

或者你可以这样做,

mViewHolder.mAvatar.setImageResource(avatarImage [(position%avatarImage.length)]);

答案 1 :(得分:0)

你有一个&lt; = in for for循环

for (int i=0; i<=countOfValues; i++) 它应该是

for (int i=0; i<countOfValues; i++)