使用无限适配器进行ClassCastException

时间：2012-08-09 10:24:29

标签： android commonsware-cwac

我有这种classcastexception 我结合了Fedor的lazylist和Commonware的无尽

我有这个错误

08-09 18:06:26.553: E/AndroidRuntime(314): FATAL EXCEPTION: main
08-09 18:06:26.553: E/AndroidRuntime(314): java.lang.ClassCastException:com.example.endlesscustom.EndlessSample$CustomArrayAdapter
08-09 18:06:26.553: E/AndroidRuntime(314):  at com.example.endlesscustom.EndlessSample$DemoAdapter.appendCachedData(EndlessSample.java:174)
08-09 18:06:26.553: E/AndroidRuntime(314):  at com.commonsware.cwac.endless.EndlessAdapter$AppendTask.onPostExecute(EndlessAdapter.java:247)

它指出了这个错误

ArrayAdapter<HashMap<String, String>> arrAdapterNew = ArrayAdapter<HashMap<String,String>>) getWrappedAdapter();

这是我的代码

public class EndlessSample extends ListActivity {

static int LIST_SIZE;
private int mLastOffset = 0;

static final int BATCH_SIZE = 3;

ArrayList<HashMap<String, String>> countriesSub = new ArrayList<HashMap<String, String>>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.maina);
    init();
    Log.i("country", String.valueOf(COUNTRIES.length));
    Log.i("mstrings", String.valueOf(mStrings.length));

}

private void init() {
    LIST_SIZE = COUNTRIES.length;
    for (int i = 0; i <= BATCH_SIZE; i++) {
        HashMap<String, String> map = new HashMap<String, String>();
        map.put("country", COUNTRIES[i]);
        map.put("pic", mStrings[i]);
        countriesSub.add(map);
    }
    setLastOffset(BATCH_SIZE);
    displayList(countriesSub);
}

private void setLastOffset(int i) {
    mLastOffset = i;
}

private int getLastOffset() {
    return mLastOffset;
}

private void displayList(ArrayList<HashMap<String, String>> countriesSub2) {
    setListAdapter(new DemoAdapter());
}

private class CustomArrayAdapter extends BaseAdapter {
    public ImageLoader imageLoader;
    private ArrayList<HashMap<String, String>> data;

    public CustomArrayAdapter(Context context, int resource,
            int textViewResourceId,
            ArrayList<HashMap<String, String>> mylist) {
        data = mylist;
        imageLoader = new ImageLoader(context);
    }

    public int getCount() {
        return data.size();
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder;
        HashMap<String, String> song = new HashMap<String, String>();

        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) EndlessSample.this
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.row, null);
            holder = new ViewHolder();
            holder.word = (TextView) convertView
                    .findViewById(R.id.throbber);
            holder.pecture = (ImageView) convertView
                    .findViewById(R.id.imahe);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Log.i("data size", String.valueOf(data.size()));
        song = data.get(position);
        holder.word.setText(song.get("country"));
        // holder.word.setText(String.valueOf(position + 1) + ". "
        // + countriesSub.get(position));
         imageLoader.DisplayImage(song.get("pic"), holder.pecture);
        return convertView;
    }

    public class ViewHolder {
        public ImageView pecture;
        public TextView word;
    }
}

class DemoAdapter extends EndlessAdapter {
    ArrayList<HashMap<String, String>> tempList = new ArrayList<HashMap<String, String>>();

    DemoAdapter() {
        super(new CustomArrayAdapter(EndlessSample.this,
                android.R.layout.simple_list_item_1, android.R.id.text1,
                countriesSub));

    }

    @Override
    protected View getPendingView(ViewGroup parent) {
        View row = getLayoutInflater().inflate(R.layout.row, null);

        View child = row.findViewById(android.R.id.text1);
        // child.setVisibility(View.GONE);
        child = row.findViewById(R.id.throbber);
        child.setVisibility(View.VISIBLE);

        return (row);
    }

    @Override
    protected boolean cacheInBackground() {
        tempList.clear();
        int lastOffset = getLastOffset();
        if (lastOffset < LIST_SIZE) {
            int limit = lastOffset + BATCH_SIZE;
            for (int i = (lastOffset + 1); (i <= limit && i < LIST_SIZE); i++) {
                HashMap<String, String> map = new HashMap<String, String>();
                map.put("country", COUNTRIES[i]);
                map.put("pic", mStrings[i]);
                tempList.add(map);
            }
            setLastOffset(limit);

            if (limit < LIST_SIZE) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

    @Override
    protected void appendCachedData() {

        @SuppressWarnings("unchecked")
        ArrayAdapter<HashMap<String, String>> arrAdapterNew = (ArrayAdapter<HashMap<String, String>>) getWrappedAdapter();
        int listLen = tempList.size();
        for (int i = 0; i < listLen; i++) {
            arrAdapterNew.add(tempList.get(i));
        }
    }
}

static final String[] COUNTRIES = new String[] { "Afghanistan", "Albania",
        "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla",
        "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia",
        "Aruba", "Australia", "Austria", "Azerbaijan", "Bahrain",
        "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",
        "Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina",
        "Botswana", "Bouvet Island", "Brazil",
        "British Indian Ocean Territory", "British Virgin Islands",
        "Brunei", "Bulgaria", "Burkina Faso", "Burundi", "Cote d'Ivoire",
        "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",
        "Central African Republic", "Chad", "Chile", "China",
        "Christmas Island", "Cocos (Keeling) Islands", "Colombia",
        "Comoros", "Congo", "Cook Islands", "Costa Rica", "Croatia",
        "Cuba", "Cyprus", "Czech Republic",
        "Democratic Republic of the Congo", "Denmark", "Djibouti",
        "Dominica", "Dominican Republic", "East Timor", "Ecuador", "Egypt",
        "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia",
        "Ethiopia", "Faeroe Islands", "Falkland Islands", "Fiji",
        "Finland", "Former Yugoslav Republic of Macedonia", "France",
        "French Guiana", "French Polynesia", "French Southern Territories",
        "Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",
        "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",
        "Guinea", "Guinea-Bissau", "Guyana", "Haiti",
        "Heard Island and McDonald Islands", "Honduras", "Hong Kong",
        "Hungary", "Iceland", "India", "Indonesia", "Iran", "Iraq",
        "Ireland", "Israel", "Italy", "Jamaica" };

private String[] mStrings = {
        "http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter.png",
        "http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook.png",
        "http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg",
        "http://a1.twimg.com/profile_images/74724754/android_logo_normal.png",
        "http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png",
        "http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png",
        "http://a3.twimg.com/profile_images/548410609/icon_8_73.png",
        "http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg",
        "http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png",
        "http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
        "http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter_normal.png",
        "http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg",
        "http://a1.twimg.com/profile_images/74724754/android_logo.png",
        "http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png",
        "http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png",
        "http://a3.twimg.com/profile_images/548410609/icon_8_73_normal.png",
        "http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg",
        "http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png",
        "http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png" };
}

如果有人遇到此错误请帮助

非常感谢

1 个答案:

答案 0 :(得分：2)

您放入EndlessAdapter的适配器是CustomArrayAdapter，而不是ArrayAdapter<HashMap<String, String>>，这就是为什么在尝试投放{{1}时获得ClassCastException的原因} CustomArrayAdapter致ArrayAdapter<HashMap<String, String>>的一部分。

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