通过简单的适配器在 imageview 中显示位图图像 [英] Displaying bitmap image in imageview by simple adapter

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本文介绍了通过简单的适配器在 imageview 中显示位图图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我从一个网址获取图像.我在列表视图中使用图像视图.我想将位图图像列表添加到列表项的每一行中.我使用了 SimpleAdapter,但 imageview 显示空白.我的代码在下面!!

I am getting image from an url. I am using imageview in listview. I want to add the list of bitmap images into the each row of the list item. I used SimpleAdapter but the imageview shows blank.My code is below !!

 ArrayList<HashMap<String, Bitmap>> mylist = new ArrayList<HashMap<String, Bitmap>>();

    Bundle bundle = this.getIntent().getExtras();
     get = bundle.getString("name");

     try{
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://www.propertyhookup.com/mobile/propertylist.php");
            nameValuePairs = new ArrayList<NameValuePair>(1);
            nameValuePairs.add(new BasicNameValuePair("zipcode", get.trim()));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            is = entity.getContent();

    }catch(Exception e){
            Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
    }

  //convert response to string
    try{
            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                    sb.append(line + "
");
            }
            is.close();
            result=sb.toString();
    }catch(Exception e){
            Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
    }
    if(result.length()<= 7){
        Toast.makeText(getApplicationContext(), "No properties for this zipcode or check your zipcode ", Toast.LENGTH_LONG).show();
        //text.setText("No properties for this zipcode or check your zipcode");
    }
    else{
    try{

     jArray = new JSONObject(result);            
    }catch(JSONException e){
        Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
    }

    //JSONObject json = JSONfunctions.getJSONfromURL("http://192.168.1.111/propertyhookup.com/mobile/propertylist.php");

    try{

        JSONArray  earthquakes = jArray.getJSONArray("earthquakes");

        for(int i=0;i<10;i++){                      
            map = new HashMap<String, Bitmap>();
            //HashMap<String, Drawable> map1 = new HashMap<String, Drawable>();

            JSONObject e = earthquakes.getJSONObject(i);



            if(e.getString("property_type").contains("1")) {
                proptype ="Single Family Home";
            }else if(e.getString("property_type").contains("2")) {
                proptype="Condo";
            }else if(e.getString("property_type").contains("3")) {
                proptype="Townhouse";
            }
            if(e.getString("estimated_price").contains("0")) {
                estimate = "Not Enough Market Value";
                //estimat = (TextView) findViewById(R.id.estimat);
                //estimat.setTextColor(Color.rgb(0, 0, 23));
            }else {
                estimate = "$"+e.getString("estimated_price");
            }

            photo = e.getString("photo1");

            drawable = LoadImageFromWebOperations(photo);

            //text.setImageDrawable(d);

            try
            {
                    aURL = new URL(photo);
            }
            catch (MalformedURLException e1)
            {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
            }
            URLConnection conn = null;
            try
            {
                    conn = aURL.openConnection();
            }
            catch (IOException e1)
            {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
            }
            try
            {
                    conn.connect();
            }
            catch (IOException e1)
            {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
            }
            InputStream is = null;
            try
            {
                    is = conn.getInputStream();
            }
            catch (IOException e1)
            {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
            }
            BufferedInputStream bis = new
    BufferedInputStream(is,8*1024);
            Bitmap bm = BitmapFactory.decodeStream(bis);

            map.put(photos, bm);
            mylist.add(map);


        }       
    }catch(JSONException e)        {
        Toast.makeText(getApplicationContext(),e.getMessage(), Toast.LENGTH_LONG).show();
    }



    SimpleAdapter adapter = new SimpleAdapter(this, mylist , R.layout.main4, 
                   new String[] { "percent","propertyid",  "cityname", "statecode", "propertytype", "footage", "bathroom", "bedroom", "price", "estimated", "photos" }, 
                   new int[] { R.id.percent, R.id.property_id,  R.id.city_name, R.id.state_code, R.id.prop_type, R.id.foot, R.id.bath, R.id.bed, R.id.list, R.id.estimat, R.id.image});
    setListAdapter(adapter);

推荐答案

我认为是因为您正在从网络下载图像,您需要在 ASYNC 中执行这些操作,查看无痛 thrething 下载图像,然后刷新图像视图.

i think is because you are downloading the image from web and you need to do these in ASYNC see painless thrething download image and after that refresh just the imageviews.

这篇关于通过简单的适配器在 imageview 中显示位图图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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