我正在使用 JSON 解析器来解析 JSON 响应，我可以在 ListView 中获取项目名称，但无法获取与其对应的图像。JSON 响应中存在图像 url。我如何解析响应以获取与项目相对应的图像。以下是代码，任何知道如何执行此操作的人都可以帮助我，这将非常有用。
注意：图像和项目不是固定的
public class AndroidJSONParsingActivity extends ListActivity {
// url to make request
private static String url = "website/?JSON=get_recent_post";
// JSON Node names
private static final String TAG_POSTS = "posts";
private static final String TAG_ID = "id";
private static final String TAG_TITLE = "title";
private static final String TAG_DATE = "date";
private static final String TAG_CONTENT = "content";
private static final String TAG_AUTHOR = "author";
private static final String TAG_NAME = "name";
// contacts JSONArray
JSONArray posts = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// Getting Array of Contacts
posts = json.getJSONArray(TAG_POSTS);
// looping through All Contacts
for(int i = 0; i < posts.length(); i++){
JSONObject c = posts.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String title = c.getString(TAG_TITLE);
String date = c.getString(TAG_DATE);
String content = c.getString(TAG_CONTENT);
// Phone number is agin JSON Object
JSONObject author = c.getJSONObject(TAG_AUTHOR);
String name = author.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_TITLE, title);
map.put( TAG_DATE, date);
map.put( TAG_NAME, name);
map.put( TAG_CONTENT, content);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(this, contactList,
R.layout.list_item,
new String[] { TAG_TITLE, TAG_DATE, TAG_NAME, TAG_CONTENT }, new int[] {
R.id.name, R.id.email,R.id.mobile, R.id.content });
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String title = ((TextView) view.findViewById(R.id.name)).getText().toString();
String date = ((TextView) view.findViewById(R.id.email)).getText().toString();
String name = ((TextView) view.findViewById(R.id.mobile)).getText().toString();
String content = ((TextView) view.findViewById(R.id.content)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(TAG_TITLE, title);
in.putExtra(TAG_DATE, date);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_CONTENT, content);
startActivity(in);
}
});
}
}
JSONParser.java
公共类 JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
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 + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
SingleMenuItem.java
public class SingleMenuItemActivity extends Activity {
// JSON node keys
private static final String TAG_TITLE = "title";
private static final String TAG_DATE = "date";
private static final String TAG_NAME = "name";
private static final String TAG_CONTENT = "content";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single_list_item);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
String title = in.getStringExtra(TAG_TITLE);
String date = in.getStringExtra(TAG_DATE);
String name = in.getStringExtra(TAG_NAME);
String content = in.getStringExtra(TAG_CONTENT);
// Displaying all values on the screen
TextView lblName = (TextView) findViewById(R.id.name_label);
TextView lblCost = (TextView) findViewById(R.id.email_label);
TextView lblDesc = (TextView) findViewById(R.id.mobile_label);
TextView lblCont = (TextView) findViewById(R.id.content_label);
lblName.setText(title);
lblCost.setText(date);
lblDesc.setText(name);
lblCont.setText(content);
}
}