Android代码，用于从服务器获取图像并在Imageview中显示 [英] Android code to fetch Image from server and display it in Imageview

问题描述

您好我知道如何从jsonobject获取字符串，但我的问题是如何从Rest api获取图像并显示它。图像存储为jsonobject中的profile_image

我的代码：

 试试{
 JSONObject jsonObject = new JSONObject（response）; 
 JSONObject object = jsonObject.getJSONObject（user）; 
 String attr1 = object.getString（username）; 
 data =+ attr1; 
 textView15.setText（data）; 
 if（object.has（profession））{
 String attr2 = object.getString（profession）; 
 data2 =+ attr2; 
 textView16.setText（data2）; 
} 
 if（object.has（company））{
 String attr3 = object.getString（company）; 
 data3 =+ attr3; 
 textView38.setText（data3）; 
} 
 
 if（object.has（profile_image））{
 //这里必须做什么
} 
  

解决方案

有几种可能的情况：

案例1. 图像是Base64，然后您需要对其进行解码并使用BitmapFactory方法：

  byte [] decodingString = Base64.decode（encodedImage，Base64.DEFAULT）; 
 Bitmap decodingByte = BitmapFactory.decodeByteArray（decodingString，0，encodedString.length）; 
  

案例2. Json包含图像链接。只需加载链接，当您收到Stream对象时，将其传递给BitmapFactory。这样的事情：

  InputStream instream = httpEntity.getContent（）; 
 bmp = BitmapFactory.decodeStream（instream）; 
  

以上示例使用HttpClient类，搜索api文档，了解如何从您使用过的网络库中获取InputStream。 / p>

Hi I know how to fetch an string from jsonobject, but my question is how to fetch an image from Rest api and display it. The image is stored as profile_image in jsonobject

My code:

 try {
                    JSONObject jsonObject = new JSONObject(response);
                    JSONObject object = jsonObject.getJSONObject("user");
                    String attr1 = object.getString("username");
                    data = "" + attr1;
                    textView15.setText(data);
                    if (object.has("profession")) {
                        String attr2 = object.getString("profession");
                        data2 = "" + attr2;
                        textView16.setText(data2);
                    }
                    if(object.has("company")){
                        String attr3 = object.getString("company");
                        data3 = "" + attr3;
                     textView38.setText(data3);
                    }

                    if(object.has("profile_image")) {
                        //what has to be done here
                    }

解决方案

There are several possible cases:

Case 1. Image is Base64, then you need to decode it and use BitmapFactory method:

byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); 

Case 2. Json contains link to image. Simply load the link, and when you receive Stream object, pass it to BitmapFactory. Something like this:

InputStream instream = httpEntity.getContent();
bmp = BitmapFactory.decodeStream(instream);

Above example uses HttpClient class, search api docs on how to get InputStream from your used network library.

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