在Android中使用LazyAdapter刷新ListView

Question

I am developing one application in that put all data in listview whatever coming from server for that i am using lazyadapter.Now i want to refresh all data in the listview(whenever click the button remove current data and update only new data ie coming from server).i am using notifyDataSetChanged(). its not working.please help me

My code:

Activity

   public class JamLocationsActivity extends Activity   {


     private ListView listView;
    private String[] imageUrls;
    private ArrayList<String> imagesArray;
    private ArrayList<String> descArray;
    private ArrayList<String> dateTimeArray;
    private ArrayList<String> titleArray;
    private ArrayList<String> userArray;
    private LazyAdapter adapter;
    private ArrayList<HashMap<String, String>> latlngArray;
    private RecieveDataDTO receivingDatDto;
    private Button btn;
    private static ImageLoader imageLoader;

    @SuppressWarnings("unchecked")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
          ActionBar bar = getActionBar();
             bar.setDisplayShowHomeEnabled(false);
             bar.setDisplayShowTitleEnabled(false);
             bar.setDisplayShowCustomEnabled(true);
            bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#ffffff")));
            imageUrls=Constants.IMAGES;

            getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM); 
            getActionBar().setCustomView(R.layout.action_bar_jamlocation);
           setContentView(R.layout.activity_jam_locations);

           imageLoader = ImageLoader.getInstance();

           JamLocationsActivity.imageLoader.init(ImageLoaderConfiguration.createDefault(this));

            imagesArray   = 
          (ArrayList<String>)getIntent().getSerializableExtra("imgArry");
            descArray     = 
           (ArrayList<String>)getIntent().getSerializableExtra("descArry");
            dateTimeArray = 
           (ArrayList<String>)getIntent().getSerializableExtra("dateTimeArry");
            titleArray    = 
           (ArrayList<String>)getIntent().getSerializableExtra("titleArr");
            userArray     = 
          (ArrayList<String>)getIntent().getSerializableExtra("userArr");
            latlngArray   =(ArrayList<HashMap<String, 
          String>>)getIntent().getSerializableExtra("latlngArr");
            Log.e("ARRAY", latlngArray.toString());

             receivingDatDto = new RecieveDataDTO();
            receivingDatDto.setImageArr(imagesArray);
            receivingDatDto.setTitleArr(titleArray);
            receivingDatDto.setUserArr(userArray);
            receivingDatDto.setDateTimeArr(dateTimeArray);
            receivingDatDto.setDescArr(descArray);
        //receivingDatDto.setLatLngArr(latlngArray);
         adapter = new LazyAdapter(JamLocationsActivity.this,receivingDatDto);


        listView=(ListView)findViewById(R.id.listView1);
        listView.setAdapter(adapter);

        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                               adapter.clearAdapter();
                  adapter.notifyDataSetChanged();
            }
        });

    }

LazyAdapter

 public class LazyAdapter extends BaseAdapter{

    static Context context;
     private TextView timeTextView;
     private ListView listView;


    private String imageurl[]=null;
    private ArrayList<String> imgUrl;
    private ArrayList<String> images;
    private ArrayList<String> users;
    private ArrayList<String> dateTimes;
    private ArrayList<String> titles;
    private ArrayList<String> descriptions;
    private  ArrayList<HashMap<String, String>> latlngs;

    DisplayImageOptions doption=null;
    private ImageLoadingListener animateFirstListener =null;
    RecieveDataDTO receivedata= new RecieveDataDTO();




    // static ImageLoader imageLoader = ImageLoader.getInstance();

    public LazyAdapter(Context c,RecieveDataDTO dto){
        context=c;
        //this.imageurl=url;
    //  this.imgUrl = url;
        this.images = dto.getImageArr();
        this.users = dto.getUserArr();
        this.descriptions=dto.getDescArr();
        this.dateTimes=dto.getDateTimeArr();
        this.titles=dto.getTitleArr();
        this.latlngs=dto.getLatLngArr();



    }


    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        //return imageurl.length;
        return users.size();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View view=convertView;
        ViewHolder viewHolder;
        Log.e("ADAPTER", images.toString());
        //viewHolder.mydate = 
      java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
        AQuery androidAQuery = new AQuery(context);
        if(convertView==null){
        LayoutInflater inflater=(LayoutInflater)context. 
           getSystemService(context.LAYOUT_INFLATER_SERVICE);
         view=inflater.inflate(R.layout.custom_data_list, null);
         viewHolder = new ViewHolder();
        viewHolder.shareBtn=(Button)view.findViewById(R.id.shareBtn);
        viewHolder.mapButton=(Button)view.findViewById(R.id.reportBtn);
        viewHolder.imageView2=(ImageView)view.findViewById(R.id.imageView2);
        viewHolder.imageView1=(ImageView)view.findViewById(R.id.imageView1);



         animateFirstListener = new AnimateFirstDisplayListener();
         viewHolder.addressTxtView=(TextView) view.findViewById(R.id.adddTextId);
         viewHolder.headTextView  = (TextView)view.findViewById(R.id.headTextId);
         viewHolder.dateTextView=(TextView) view.findViewById(R.id.dateTextId);
         viewHolder.userTextView=(TextView)view.findViewById(R.id.textView1);
         view.setTag(viewHolder);
        }else{
            viewHolder=(ViewHolder)view.getTag();
        }
         if(images.get(position).equals("")){
             viewHolder.imageView2.setVisibility(View.GONE);
         }
         else{
        androidAQuery.id(viewHolder.imageView2).image(images.get(position), true, true);
             /*ImageLoader imageLoader = ImageLoader.getInstance();
             imageLoader.displayImage(images.get(position), viewHolder.imageView2, 
          animateFirstListener);*/
         }
        // androidAQuery.id(viewHolder.imageView2).image(Constants.IMAGES[position], true, 
          true);
         viewHolder.addressTxtView.setText(descriptions.get(position));
         viewHolder.dateTextView.setText(dateTimes.get(position));
         viewHolder.headTextView.setText(titles.get(position));
         viewHolder.userTextView.setText(users.get(position));
         if(users.get(position).equals("police")){

        viewHolder.imageView1.setImageResource(R.drawable.common_signin_btn_icon_dark);
         }
         else{

       viewHolder.imageView1.setImageResource(R.drawable.common_signin_btn_icon_light);
         }
        /* ImageLoader imageLoader = ImageLoader.getInstance();
         imageLoader.displayImage("", viewHolder.imageView2);
         imageLoader.displayImage(imgUrl.get(position), viewHolder.imageView2, animateFirstListener);*/

        viewHolder.shareBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(context,AndroidFacebookSample.class);
                intent.putExtra("fbVal", descriptions.get(position));
                intent.putExtra("trTime", dateTimes.get(position));
                context.startActivity(intent);
            }
        });
        viewHolder.mapButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(context,SingleJamLocationActivity.class);

                context.startActivity(intent);

            }
        });
        viewHolder.imageView2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Log.e("You", "Clicked Me");
                Intent intent = new Intent(context, ImagePerActivity.class);
                intent.putExtra("imageurlpostion", images);
                intent.putExtra("imagepostion", position);
                context.startActivity(intent);

            }
        });


        return view;
    }
    private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {

        static final List<String> displayedImages = Collections.synchronizedList(new 
      LinkedList<String>());

        @Override
        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            if (loadedImage != null) {
                ImageView imageView = (ImageView) view;
                boolean firstDisplay = !displayedImages.contains(imageUri);
                if (firstDisplay) {
                    FadeInBitmapDisplayer.animate(imageView, 500);
                    displayedImages.add(imageUri);
                }
            }
        }
    }

Answer 1

Have the same problem. Came to this solution, try it. The only problem is that the listview will blink on refresh...

public void onClick(View v) {
    Parcelable state = listview.onSaveInstanceState();  //save listview position
    adapter = new LazyAdapter(JamLocationsActivity.this,receivingDatDto);
    listView.setAdapter(adapter);
    listview.onRestoreInstanceState(state);    //restore listview position
}