列表视图项重复的Andr​​oid？ [英] list view item repeated in android?

问题描述

我用下面的code，列出从阵列几个项目，同时滚动列表视图中的项目是在阵列我不`吨知道我犯了什么样的错误相同的数据退出追加更多。

任何人都指出，在那里我所犯的错误。

 私有静态字符串array_spinner_subcategories [];
    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        requestWindowFeature（Window.FEATURE_NO_TITLE）;
        setRequestedOrientation（ActivityInfo.SCREEN_ORIENTATION_PORTRAIT）;
        的setContentView（R.layout.sub_categories）;

        setSubCat（）;

        ListView控件 - 资料下载=（ListView控件）findViewById（R.id.sub_catlist）;
        sub_categories.setAdapter（新EfficientAdapter（本））;

        sub_categories.setAdapter（适配器）;
        sub_categories.setOnItemClickListener（subcatlistener）;

        CR = getContentResolver（）;
    }
    公众的String [] setSubCat（）{
        recordDB =新Viddatabase（本​​）;
        DB = recordDB.getWritableDatabase（）;
        array_spinner_subcategories = recordDB.subcategoriesList（DB）;
        recordDB.close（）;
        返回array_spinner_subcategories;
}
    私人OnItemClickListener subcatlistener =新OnItemClickListener（）{
        公共无效onItemClick（适配器视图父，视图V，INT位置，
   长ID）{
              System.gc（）的;
              Toast.makeText（SubCategories.this，array_spinner_subcategories [位置]
                        Toast.LENGTH_LONG）.show（）;

        }
   };

   私有静态类EfficientAdapter扩展了BaseAdapter {
       私人LayoutInflater mInflater;

       公共EfficientAdapter（上下文的背景下）{
       mInflater = LayoutInflater.from（上下文）;

       }

       公众诠释getCount将（）{
       返回array_spinner_subcategories.length;
       }

       公共对象的getItem（INT位置）{
       返回的位置;
       }

       众长getItemId（INT位置）{
       返回的位置;
       }

       公共查看getView（INT位置，查看convertView，ViewGroup中父）{
         System.gc（）的;
       ViewHolder持有人;

       如果（convertView == NULL）{
       convertView = mInflater.inflate（R.layout.albumlist，NULL）;
       持有人=新ViewHolder（）;

       holder.subCategories =（TextView中）convertView.findViewById（R.id.albumDetails）;
       holder.subCategories.setText（array_spinner_subcategories [位置]）;


       convertView.setTag（保持器）;
       } 其他 {
       支架=（ViewHolder）convertView.getTag（）;
       }


       返回convertView;
       }

       静态类ViewHolder {

       TextView的子类别;



       }

       }
 

解决方案

移动 holder.subCategories.setText（array_spinner_subcategories [位置]）;在行 getView（）的其他块下面的方法

i use the following code to list few items from array , while scrolling the list view items is append more with same data exit in array i don`t know what mistake i made.

Anyone pointed out where i made the mistake.

private static String array_spinner_subcategories[];
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE); 
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        setContentView(R.layout.sub_categories);

        setSubCat();

        ListView sub_categories=(ListView)findViewById(R.id.sub_catlist);
        sub_categories.setAdapter(new EfficientAdapter(this));

        sub_categories.setAdapter(adapter);
        sub_categories.setOnItemClickListener(subcatlistener);

        cr=getContentResolver();
    }
    public String[] setSubCat(){
        recordDB=new Viddatabase(this);
        db=recordDB.getWritableDatabase();
        array_spinner_subcategories=recordDB.subcategoriesList(db);
        recordDB.close();
        return array_spinner_subcategories;
}
    private OnItemClickListener subcatlistener = new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position,
   long id) {
              System.gc();
              Toast.makeText(SubCategories.this,array_spinner_subcategories[position],
                        Toast.LENGTH_LONG).show();

        }
   };

   private static class EfficientAdapter extends BaseAdapter {
       private LayoutInflater mInflater;

       public EfficientAdapter(Context context) {
       mInflater = LayoutInflater.from(context);

       }

       public int getCount() {
       return array_spinner_subcategories.length;
       }

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

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

       public View getView(int position, View convertView, ViewGroup parent) {
         System.gc();
       ViewHolder holder;

       if (convertView == null) {
       convertView = mInflater.inflate(R.layout.albumlist, null);
       holder = new ViewHolder();

       holder.subCategories = (TextView) convertView.findViewById(R.id.albumDetails);
       holder.subCategories.setText(array_spinner_subcategories[position]);


       convertView.setTag(holder);
       } else {
       holder = (ViewHolder) convertView.getTag();
       }


       return convertView;
       }

       static class ViewHolder {

       TextView subCategories;



       }

       }

解决方案

Move the holder.subCategories.setText(array_spinner_subcategories[position]); line in getView() method below the else block

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