org.json.JSONException:字符输入结束 [英] org.json.JSONException: End of input at character

问题描述

当我尝试获取没有对象的 json 时，它工作正常.但是当我尝试获取具有对象的 json 时，它会出错.

when I try to get json that doesn't have object, it works fine. but when I try go get json that has an object it's getting error.

你有什么想法吗?

protected Void doInBackground(String... params) {

    String url = "http://example.com/adchara1/";
    JSONArray data = null;

    try {
        JSONObject jsonObject = new JSONObject(result);

        MyArrList = new ArrayList<HashMap<String, Object>>();
        HashMap<String, Object> map;
        data = jsonObject.getJSONArray("countries");
        data = new JSONArray(getJSONUrl(url));
        for (int i = 0; i < data.length(); i++) {
            JSONObject c = data.getJSONObject(i);
            map = new HashMap<String, Object>();

            // Thumbnail Get ImageBitmap To Object
            map.put("photo", (String) c.getString("photo"));
            map.put("ImageThumBitmap",(Bitmap) loadBitmap(c.getString("photo")));

            // Full (for View Popup)
            map.put("frame", (String) c.getString("frame"));

            MyArrList.add(map);
        }

    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return null;
}

错误

12-26 11:51:10.352: W/System.err(23284): org.json.JSONException: End of input at character 0 of 
12-26 11:51:10.368: W/System.err(23284):    at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
12-26 11:51:10.368: W/System.err(23284):    at org.json.JSONTokener.nextValue(JSONTokener.java:97)
12-26 11:51:10.368: W/System.err(23284):    at org.json.JSONObject.<init>(JSONObject.java:154)
12-26 11:51:10.368: W/System.err(23284):    at org.json.JSONObject.<init>(JSONObject.java:171)
12-26 11:51:10.376: W/System.err(23284):    at com.example.gridview.MainActivity$DownloadJSONFileAsync.doInBackground(MainActivity.java:180)
12-26 11:51:10.376: W/System.err(23284):    at com.example.gridview.MainActivity$DownloadJSONFileAsync.doInBackground(MainActivity.java:1)
12-26 11:51:10.376: W/System.err(23284):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-26 11:51:10.376: W/System.err(23284):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-26 11:51:10.376: W/System.err(23284):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-26 11:51:10.376: W/System.err(23284):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-26 11:51:10.376: W/System.err(23284):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-26 11:51:10.376: W/System.err(23284):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-26 11:51:10.376: W/System.err(23284):    at java.lang.Thread.run(Thread.java:856)
12-26 11:51:10.399: D/libEGL(23284): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
12-26 11:51:10.423: D/libEGL(23284): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
12-26 11:51:10.430: D/libEGL(23284): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
12-26 11:51:10.516: D/OpenGLRenderer(23284): Enabling debug mode 0
12-26 11:51:10.735: D/AndroidRuntime(23284): Shutting down VM
12-26 11:51:10.735: W/dalvikvm(23284): threadid=1: thread exiting with uncaught exception (group=0x4158f300)
12-26 11:51:10.735: E/AndroidRuntime(23284): FATAL EXCEPTION: main
12-26 11:51:10.735: E/AndroidRuntime(23284): java.lang.NullPointerException
12-26 11:51:10.735: E/AndroidRuntime(23284):    at com.example.gridview.MainActivity$ImageAdapter.getCount(MainActivity.java:122)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.widget.GridView.setAdapter(GridView.java:182)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at com.example.gridview.MainActivity.ShowAllContent(MainActivity.java:91)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at com.example.gridview.MainActivity$DownloadJSONFileAsync.onPostExecute(MainActivity.java:209)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at com.example.gridview.MainActivity$DownloadJSONFileAsync.onPostExecute(MainActivity.java:1)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.os.AsyncTask.finish(AsyncTask.java:631)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.os.AsyncTask.access$600(AsyncTask.java:177)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.os.Looper.loop(Looper.java:137)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at android.app.ActivityThread.main(ActivityThread.java:4931)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at java.lang.reflect.Method.invokeNative(Native Method)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at java.lang.reflect.Method.invoke(Method.java:511)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
12-26 11:51:10.735: E/AndroidRuntime(23284):    at dalvik.system.NativeStart.main(Native Method)
12-26 11:51:12.509: I/Process(23284): Sending signal. PID: 23284 SIG: 9

推荐答案

更改

 JSONObject jsonObject = new JSONObject(result);

到

result=getJSONUrl(url);  //<< get json string from server
JSONObject jsonObject = new JSONObject(result);

在 DownloadJSONFileAsync 的 doInBackground 方法中，因为目前您没有发布任何从服务器获取 Json 数据的帖子，只是尝试将空字符串解析为 json

inside doInBackground method of DownloadJSONFileAsync because currently you are not making any post for getting Json data from the server and just trying to parse an empty string to json

这篇关于org.json.JSONException:字符输入结束的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！