使用JSON显示图像 [英] Display image using json
本文介绍了使用JSON显示图像的处理方法，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
有是我想显示图像的gridview的。我想下面使用JSON来diplay在我的gridview的图像。我有ImageAdapter类的ImageAdapter类我有AsynTask那得到JSON，但我不知道如何使用它diplaly在GridView的形象。
我如何使用这个JSON显示图像？
<$p$p><$c$c>{\"countries\":[{\"id\":\"1\",\"first_name\":\"man\",\"last_name\":\"woman\",\"username\":\"man\",\"password\":\"4f70432e636970de9929bcc6f1b72412\",\"email\":\"man@gmail.com\",\"photo\":\"http:\\/\\/vulcan.wr.usgs.gov\\/Imgs\\/Jpg\\/MSH\\/Images\\/MSH64_aerial_view_st_helens_from_NE_09-64_med.jpg\",\"frame\":\"http:\\/\\/easy4us.files.word$p$pss.com\\/2011\\/02\\/frame-1-4.jpg\"}]}ImageAdapter
公共类ImageAdapter延伸BaseAdapter {
公共字符串url_select =http://192.168.10.104/adchara1/; 私人语境mContext; 公共ImageAdapter（上下文C）{
mContext = C;
} @覆盖
公众诠释的getCount（）{
返回0;
} @覆盖
公共对象的getItem（INT为arg0）{
返回null;
} @覆盖
众长getItemId（INT为arg0）{
返回0;
} @覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）{ ImageView的ImageView的;
如果（convertView == NULL）{
ImageView的=新ImageView的（mContext）;
imageView.setLayoutParams（新GridView.LayoutParams（85,85））;
imageView.setScaleType（ImageView.ScaleType.CENTER_CROP）;
imageView.setPadding（8,8，8,8）;
}其他{
ImageView的=（ImageView的）convertView;
} //imageView.setImageResource(mthumbIds[position]）; 返回ImageView的;
} 公共类任务扩展的AsyncTask＆LT;字符串，字符串，太虚＆GT; {
InputStream为= NULL;
字符串结果=; @覆盖
保护无效doInBackground（字符串... PARAMS）{ HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httpPost =新HttpPost（url_select）;
ArrayList的＆LT;＆的NameValuePair GT;参数=新的ArrayList＆LT;＆的NameValuePair GT;（）; 尝试{
httpPost.setEntity（新UrlEn codedFormEntity（参数））;
HTT presponse HTT presponse = httpClient.execute（httpPost）;
HttpEntity httpEntity = HTT presponse.getEntity（）;
是= httpEntity.getContent（）;
}赶上（例外五）{
Log.e（log_tag，在HTTP连接错误+ e.toString（））;
} 尝试{
BR的BufferedReader =新的BufferedReader（新的InputStreamReader（是））;
StringBuilder的SB =新的StringBuilder（）;
串线=;
而（（行= br.readLine（））！= NULL）{
sb.append（行+\\ n）;
}
is.close（）;
结果= sb.toString（）;
}赶上（例外五）{
Log.e（log_tag，错误转换结果+ e.toString（））;
}
返回null;
} 保护无效onPostExecute（虚空V）{
尝试{
JSONObject的jObject =新的JSONObject（结果）;
JSONArray jArray = jObject.getJSONArray（国家）;
的for（int i = 0; I＆LT; jArray.length（）;我++）{
的JSONObject的JSONObject = jArray.getJSONObject（I）
串照片= jsonObject.getString（照片）;
}
}赶上（例外五）{
// TODO：处理异常
}
} }
}
MainActivity
公共类MainActivity延伸活动{@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）; GridView控件的GridView =（GridView控件）findViewById（R.id.gridView）;
gridview.setAdapter（新ImageAdapter（本））; gridview.setOnItemClickListener（新OnItemClickListener（）{ @覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;母公司，视图V，INT位置，
长ID）{
意图I =新意图（MainActivity.this，FullImageActivity.class）;
i.putExtra（的ImagePath，位置）;
startActivity（ⅰ）;
Toast.makeText（MainActivity.this，+（位置+1），Toast.LENGTH_SHORT）.show（）;
}
}）;}
}
解决方案
这个例子可以帮助你结果
它是样本例子之一
无效MainWindow_Loaded（对象发件人，RoutedEventArgs E）
{
HttpWebRequest的myReq =（HttpWebRequest的）WebRequest.Create（（链接用于取JSON数据））;
myReq.Method = WebRequestMethods.Http.Get;
myReq.Accept =apllication / JSON;
变种响应=（HttpWebResponse）myReq.GetResponse（）;
字符串的myString = response.GetResponseHeader（REGISTRATION_STATUS）;
使用（VAR SR =新的StreamReader（response.GetResponseStream（）））
{
JSON = sr.ReadToEnd（）; StreamWriter的SW =新的StreamWriter（@D：\\其他\\ DemoCreatingCustomEvents \\ TextFile1.txt）;
sw.Write（label1.Content.ToString（））;
sw.Close（）;
}
} JSON字符串=; 私人无效的button1_Click（对象发件人，RoutedEventArgs E）
{ 产品分类deserializedProdCategory =新的产品分类（）;
MemoryStream的毫秒=新的MemoryStream（Encoding.UTF8.GetBytes（JSON））;
DataContractJsonSerializer SER =新DataContractJsonSerializer（deserializedProdCategory.GetType（））; deserializedProdCategory = ser.ReadObject（毫秒），为产品分类;
ms.Close（）;
//你可以在这里获取数据，它是在标签所示的
label1.Content = deserializedProdCategory.ProdCategory [1] .Product_ID +//+ deserializedProdCategory.ProdCategory [1] .Product_Name;
}
公共类产品分类
{
公开名单＆LT;产品与GT; ProdCategory =新的List＆LT;产品及GT;（）;
公共产品分类（）
{
ProdCategory =新的List＆LT;产品及GT;（）;
}
}
公共类产品
{
公众诠释PRODUCT_ID {搞定;组; }
公共字符串Product_ code {搞定;组; }
公共字符串PRODUCT_NAME {搞定;组; }
公众开放的Image_Small {搞定;组; }
}
There is a gridview in which I want to display a image. I want to use this json below to diplay image in my gridview. I have an ImageAdapter class in ImageAdapter class I have AsynTask that get json but I don't know how to using it to diplaly image in gridview.
How can I display image using this json?
{"countries":[{"id":"1","first_name":"man","last_name":"woman","username":"man","password":"4f70432e636970de9929bcc6f1b72412","email":"man@gmail.com","photo":"http:\/\/vulcan.wr.usgs.gov\/Imgs\/Jpg\/MSH\/Images\/MSH64_aerial_view_st_helens_from_NE_09-64_med.jpg","frame":"http:\/\/easy4us.files.wordpress.com\/2011\/02\/frame-1-4.jpg"}]}
ImageAdapter
public class ImageAdapter extends BaseAdapter {
public String url_select = "http://192.168.10.104/adchara1/";
private Context mContext;
public ImageAdapter(Context c){
mContext = c;
}
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if(convertView == null){
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(85,85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
}else{
imageView = (ImageView) convertView;
}
//imageView.setImageResource(mthumbIds[position]);
return imageView;
}
public class Task extends AsyncTask<String, String, Void>{
InputStream is = null;
String result = "";
@Override
protected Void doInBackground(String... params) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url_select);
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
try {
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (Exception e) {
Log.e("log_tag","Error in http connection " + e.toString());
}
try {
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error Converting result " + e.toString());
}
return null;
}
protected void onPostExecute(Void v){
try {
JSONObject jObject = new JSONObject(result);
JSONArray jArray = jObject.getJSONArray("countries");
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonObject = jArray.getJSONObject(i);
String photo = jsonObject.getString("photo");
}
} catch (Exception e) {
// TODO: handle exception
}
}
}
}
MainActivity
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridView);
gridview.setAdapter(new ImageAdapter(this));
gridview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
Intent i = new Intent(MainActivity.this, FullImageActivity.class);
i.putExtra("imagePath", position);
startActivity(i);
Toast.makeText(MainActivity.this, "" + (position + 1), Toast.LENGTH_SHORT).show();
}
});
}
}
解决方案
This example may help you
It is one of the sample example
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("(link for fetching json data)");
myReq.Method = WebRequestMethods.Http.Get;
myReq.Accept = "apllication/json";
var response = (HttpWebResponse)myReq.GetResponse();
string myString= response.GetResponseHeader("Registration_Status");
using (var sr = new StreamReader(response.GetResponseStream()))
{
json = sr.ReadToEnd();
StreamWriter sw = new StreamWriter(@"D:\others\DemoCreatingCustomEvents\TextFile1.txt");
sw.Write(label1.Content.ToString());
sw.Close();
}
}
string json="";
private void button1_Click(object sender, RoutedEventArgs e)
{
ProductCategory deserializedProdCategory = new ProductCategory();
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json));
DataContractJsonSerializer ser = new DataContractJsonSerializer(deserializedProdCategory.GetType());
deserializedProdCategory = ser.ReadObject(ms) as ProductCategory;
ms.Close();
//you can fetch the data here and it is shown in label
label1.Content = deserializedProdCategory.ProdCategory[1].Product_ID + "//" + deserializedProdCategory.ProdCategory[1].Product_Name;
}
public class ProductCategory
{
public List<Product> ProdCategory = new List<Product>();
public ProductCategory()
{
ProdCategory = new List<Product>();
}
}
public class Product
{
public int Product_ID { get; set; }
public string Product_Code { get; set; }
public string Product_Name { get; set; }
public Uri Image_Small { get; set; }
}
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