java.lang.IllegalArgumentException:查询中的非法字符

Question

似乎这个错误消息已经发布了很多,但我还没有能够拿出正确的答案.

我正在关注本教程,但我无法将Google地方信息显示在屏幕上.我在看LogCat看到了这个:

09-20 02:01:32.278: W/System.err(19832): java.lang.IllegalArgumentException: Illegal character in query at index 127: https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=41.6997688,-86.2406069&radius=1000&sensor=true&types=food|bar|store|museum|art_gallery&key=AIzaSyDdMnQpqT9pr-k6VhwesT1OBAg_qkvflxU
09-20 02:01:32.278: W/System.err(19832):    at java.net.URI.create(URI.java:727)
09-20 02:01:32.278: W/System.err(19832):    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
09-20 02:01:32.278: W/System.err(19832):    at com.mbau.miniproject2.ShowMapActivity$GetPlaces.doInBackground(ShowMapActivity.java:145)
09-20 02:01:32.278: W/System.err(19832):    at com.mbau.miniproject2.ShowMapActivity$GetPlaces.doInBackground(ShowMapActivity.java:1)
09-20 02:01:32.278: W/System.err(19832):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
09-20 02:01:32.278: W/System.err(19832):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
09-20 02:01:32.278: W/System.err(19832):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
09-20 02:01:32.278: W/System.err(19832):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
09-20 02:01:32.278: W/System.err(19832):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
09-20 02:01:32.278: W/System.err(19832):    at java.lang.Thread.run(Thread.java:841)
09-20 02:01:32.388: W/System.err(19832): org.json.JSONException: End of input at character 0 of 
09-20 02:01:32.388: W/System.err(19832):    at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
09-20 02:01:32.388: W/System.err(19832):    at org.json.JSONTokener.nextValue(JSONTokener.java:97)
09-20 02:01:32.388: W/System.err(19832):    at org.json.JSONObject.<init>(JSONObject.java:154)
09-20 02:01:32.388: W/System.err(19832):    at org.json.JSONObject.<init>(JSONObject.java:171)
09-20 02:01:32.388: W/System.err(19832):    at com.mbau.miniproject2.ShowMapActivity$GetPlaces.onPostExecute(ShowMapActivity.java:187)
09-20 02:01:32.388: W/System.err(19832):    at com.mbau.miniproject2.ShowMapActivity$GetPlaces.onPostExecute(ShowMapActivity.java:1)
09-20 02:01:32.388: W/System.err(19832):    at android.os.AsyncTask.finish(AsyncTask.java:631)
09-20 02:01:32.388: W/System.err(19832):    at android.os.AsyncTask.access$600(AsyncTask.java:177)
09-20 02:01:32.388: W/System.err(19832):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
09-20 02:01:32.388: W/System.err(19832):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-20 02:01:32.388: W/System.err(19832):    at android.os.Looper.loop(Looper.java:137)
09-20 02:01:32.388: W/System.err(19832):    at android.app.ActivityThread.main(ActivityThread.java:5276)
09-20 02:01:32.388: W/System.err(19832):    at java.lang.reflect.Method.invokeNative(Native Method)
09-20 02:01:32.388: W/System.err(19832):    at java.lang.reflect.Method.invoke(Method.java:525)
09-20 02:01:32.388: W/System.err(19832):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
09-20 02:01:32.388: W/System.err(19832):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
09-20 02:01:32.388: W/System.err(19832):    at dalvik.system.NativeStart.main(Native Method)

我所拥有的代码与教程中提供的完全相同,除了URL中的Google API密钥,清单中的Maps键,我的主要活动称为ShowMapActivity.

我不确定为什么这不起作用,但我认为它与URL有关,这会产生第一个错误.

同时,我在URL中看不到任何无效字符,当我将LogCat中的URL复制/粘贴到我的浏览器中时,它会返回一个不错的JSON文件.

有任何想法/可能的修复？

谢谢.

链接到我的文件

Answer 1

所以我最终改变了我的代码:

    String placesSearchStr="https://maps.googleapis.com/maps/api/place/nearbysearch/"
    +"json?location="
    +String.valueOf(lat)
    +","
    +String.valueOf(lng)
    +"&radius=5000&sensor=true"
    +"&types=food|bar|church|museum|art_gallery"
    +"&key=AIzaSyDdMnQpqT9pr-k6VhwesT1OBAg_qkvflxU";

至:

String latVal=String.valueOf(lat);
String lngVal=String.valueOf(lng);
String url;
try {
        url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location="
        +URLEncoder.encode(latVal, "UTF-8")
        +","
        +URLEncoder.encode(lngVal, "UTF-8")
        +"&radius="
        +URLEncoder.encode("5000", "UTF-8")
        +"&sensor="
        +URLEncoder.encode("true", "UTF-8")
        +"&types="
        +URLEncoder.encode("food|bar|church|museum|art_gallery", "UTF-8")
        +"&key="
        +URLEncoder.encode("AIzaSyDdMnQpqT9pr-k6VhwesT1OBAg_qkvflxU", "UTF-8");
        new GetPlaces().execute(url);
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

这解决了我的问题.