我尝试开发一个Android应用程序的Web服务返回一个JSON文件,例如:阅读JSON通过web服务的Android
{ “成功”:1, “消息”: “后 可用”, “posts”:[{“post_id”:“1”,“username”:“hasni”,“title”:“titre”,“message”:“这个 是我的信息”},{“post_id”:“2 “,”username“:”user2“,”title“:”titre 2“,”message“:”这是我的信息 2“},{”post_id“:”3“,”username“:”123“ “标题”: “12”, “消息”: “111”},{ “POST_ID”: “4”, “用户名”: “1212”, “标题”: “1212”, “消息”: “1212” },{“post_id”:“5”,“username”:“1212”,“title”:“bonjour”,“message”:“voila ce message qui dient d'une session “},{” POST_ID “:” 6" , “用户名”: “121212”, “标题”: “滴度”, “消息”: “消息”}]}
这是部分读取此JSON的代码:
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("receiver", strSender));
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
success = json.getInt(TAG_SUCCESS);
Log.d("ok", "ok");
if (success == 1){
messagesArray = (JSONArray)json.getJSONArray(TAG_POSTS);
for (int i= 0;i <messagesArray.length();i++){
Log.d("iteration", "iteration" + i);
JSONObject messageJson = messagesArray.getJSONObject(i);
Log.d("post_id","post_id: "+i+ " "+ messageJson.getString(TAG_POSTS_ID));
Log.d("username","username: " +i+" " + messageJson.getString(TAG_POSTS_USERNAME));
Log.d("title", "title: " +i+ " " + messageJson.getString(TAG_POSTS_ID_TITLE));
Log.d("message","message: "+i+" "+ messageJson.getString(TAG_POSTS_ID_MESSAGE));
}
}else{
Log.d("failed", "!!!!!!!!!!!!!!!!!!!!!!!!");
}
但我遇到问题:应用程序崩溃并退出。这是logcat的:
09-27 23:15:37.119:W/System.err的(489):org.json.JSONException:15:37.119:上岗09-27 23号 值W /System.err(489):at org.json.JSONObject.get(JSONObject.java:354)09-27 23:15:37.128: W/System.err(489):at org.json.JSONObject .getJSONArray(JSONObject.java:544)09-27 23:15:37.128:W/System.err(489):at com.example.mysql.ReadMessages.onCreate(ReadMessages.java:73)09-27 23:15:37.128:W/System.err(489):at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 09-27 23:15:37.128:W/Syst em.err(489):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 09-27 23:15:37.128:W/System.err(489):at android.app.ActivityThread。 (活动线程.java:1663) 09-27 23:15: 15:37.128:W/System.err(489):at android.app.ActivityThread $ H.handleMessage(ActivityThread.java:931) 09-27 23:15:37.138:W/System.err(489):在 android.os.Handler.dispatchMessage(Handler.java:99)09-27 23:15:37.138:W/System.err(489):at android.os.Looper.loop(Looper.java:123 )09-27 23:15:37.138: W/System.err(489):at android.app.ActivityThread.main(ActivityThread.java:3683)09-27 23:15:37.138:W/System.err(489):at java.lang .reflect.Method.invokeNative(Native Method)09-27 23:15:37.138:W/System.err(489):at java.lang.reflect.Method.invoke(Method.java:507)09-27 23:15:37.138: W/System.err(489):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:839) 09-27 23:15:37.138:W/System.err(489):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)09-27 23:15:37.138:W/System.err(489):at dalvik。 system.NativeStart。主(本地方法)
你能打印的Android收到的JSON?尝试编码Log.d(“json”,json.toString());'below' success = json.getInt(TAG_SUCCESS);'并告诉json收到的结构是否如你所期望的那样。 – RdlP 2014-09-27 01:01:03