我需要解析这个json字符串
{
"results": {
"result": [
{
"cover": "http://ia.media-imdb.com/images/M/MV5BMjMyOTM4MDMxNV5BMl5BanBnXkFtZTcwNjIyNzExOA@@._V1._SX54_CR0,0,54,74_.jpg",
"title": "The Amazing Spider-Man",
"year": "(2012",
"director": "Marc Webb",
"rating": "7.3",
"details": "http://www.imdb.com/title/tt0948470/"
},
{
"cover": "http://i.media-imdb.com/images/SF1f0a42ee1aa08d477a576fbbf7562eed/realm/feature.gif",
"title": "The Amazing Spider-Man 2",
"year": "(2014",
"director": "N/A",
"rating": "N/A",
"details": "http://www.imdb.com/title/tt1872181/"
},
{
"cover": "http://ia.media-imdb.com/images/M/MV5BMzk3MTE5MDU5NV5BMl5BanBnXkFtZTYwMjY3NTY3._V1._SX54_CR0,0,54,74_.jpg",
"title": "Spider-Man",
"year": "(2002",
"director": "Sam Raimi",
"rating": "7.3",
"details": "http://www.imdb.com/title/tt0145487/"
},
{
"cover": "http://ia.media-imdb.com/images/M/MV5BODUwMDc5Mzc5M15BMl5BanBnXkFtZTcwNDgzOTY0MQ@@._V1._SX54_CR0,0,54,74_.jpg",
"title": "Spider-Man 3",
"year": "(2007",
"director": "Sam Raimi",
"rating": "6.3",
"details": "http://www.imdb.com/title/tt0413300/"
},
{
"cover": "http://ia.media-imdb.com/images/M/MV5BMjE1ODcyODYxMl5BMl5BanBnXkFtZTcwNjA1NDE3MQ@@._V1._SX54_CR0,0,54,74_.jpg",
"title": "Spider-Man 2",
"year": "(2004",
"director": "Sam Raimi",
"rating": "7.5",
"details": "http://www.imdb.com/title/tt0316654/"
}
]
}
}
我收到了所有数据......但是我无法显示我从“封面”标签中获取的图片网址...从这里开始，最简单的方法是什么？ http://ia.media-imdb.com/images/M/MV5BMjMyOTM4MDMxNV5BMl5BanBnXkFtZTcwNjIyNzExOA@@._V1._SX54_CR0,0,54,74_.jpg
我已经从http json数据在listview中实现了Android Lazy Loading图像和文本，现在我想让列表项可以点击，我无法弄清楚如何为这个案例做到这一点
public class MainActivity extends Activity {
ListView mListView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView txts=(TextView) findViewById(R.id.textView1);
String URL1=getIntent().getExtras().getString("URL");
// URL to the JSON data
String strUrl = URL1;
// Creating a new non-ui thread task to download json data
DownloadTask downloadTask = new DownloadTask();
// Starting the download process
downloadTask.execute(strUrl);
// Getting a reference to ListView of activity_main
mListView = (ListView) findViewById(R.id.lv_countries);
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String>{
String data = null;
@Override
protected String doInBackground(String... url) {
try{
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
@Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>{
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
@Override
protected SimpleAdapter doInBackground(String... strJson) {
try{
jObject = new JSONObject(strJson[0]);
CountryJSONParser countryJsonParser = new CountryJSONParser();
countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("JSON Exception1",e.toString());
}
// Instantiating json parser class
CountryJSONParser countryJsonParser = new CountryJSONParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> countries = null;
try{
// Getting the parsed data as a List construct
countries = countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
// Keys used in Hashmap
String[] from = { "country","flag","details"};
// Ids of views in listview_layout
int[] to = { R.id.tv_country,R.id.iv_flag,R.id.tv_country_details};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), countries,
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
@Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
mListView.setAdapter(adapter);
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path",imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hm);
}
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<St
@Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+position+".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("flag",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
// Returning the HashMap object containing the image path and position
return hmBitmap;
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("flag");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter ) mListView.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
// Overwriting the existing path in the adapter
hm.put("flag",path);
// Noticing listview about the dataset changes
adapter.notifyDataSetChanged();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
怎么做？
答案 0 :(得分：3)
首先请查看一些教程：
http://www.androidhive.info/2012/01/android-json-parsing-tutorial/
http://www.vogella.com/articles/AndroidJSON/article.html
JSONObject response = new JSONObject(respString);
ArrayList<Book> bookCollection = new ArrayList<Book>();//
if(response.has("results")){
if(response.has("result")){
JSONArray resultArray = response.getJSONArray("result");
for(int iCount=0; iCount<resultArray.length; iCount++){
JSONObject item = resultArray.getJSONObject(iCount);
Book book = new Book();
if(item.has("title")){
book.title =item.getString("title");
}
bookCollection.add(book);
}
}
}
填充的pojo
public Book{
public String cover;
public String title;
}
答案 1 :(得分：2)
您可以尝试将当前Json字符串解析为：
JSONObject response = new JSONObject(respString);
JSONObject jsonobjresults = response.getJSONObject("results");
JSONArray resultArray = jsonobjresults.getJSONArray("result");
Map<Integer,ArrayList<String>>
mapoflisp = new HashMap<Integer,ArrayList<String>>();
ArrayList<String> listofitem;
for(int i=0; i<resultArray.length; i++){
JSONObject itemobj = resultArray.getJSONObject(i);
listofitem=new ArrayList<String>();
// Add items in List
listofitem.add(item.getString("cover"));
listofitem.add(item.getString("title"));
listofitem.add(item.getString("year"));
listofitem.add(item.getString("director"));
listofitem.add(item.getString("rating"));
listofitem.add(item.getString("details"));
//add list to Map
mapoflisp.put(i,listofitem);
// your code here...
}