java - JSON异常(exception):无值

我正在编写一个简单的android应用，该应用使用API​​来获取一些数据，但是出现以下错误：

 System.err: org.json.JSONException: No value for genre_ids
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at org.json.JSONObject.get(JSONObject.java:389)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at org.json.JSONObject.getJSONArray(JSONObject.java:584)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at com.adeel.android.movieinfoapp.Networking.onPostExecute(Networking.java:72)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at com.adeel.android.movieinfoapp.Networking.onPostExecute(Networking.java:21)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at android.os.AsyncTask.finish(AsyncTask.java:632)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at android.os.AsyncTask.access$600(AsyncTask.java:177)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at android.os.Looper.loop(Looper.java:145)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5832)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at java.lang.reflect.Method.invoke(Method.java:372)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
 07-19 18:12:08.164 24204-24204/com.adeel.android.movieinfoapp W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

下面是我的代码：

@Override
protected void onPostExecute(String s) {
    try {
        JSONObject jsonObject = new JSONObject(result);
        JSONArray jsonStrings = jsonObject.getJSONArray("genre_ids");
        String strings[] = new String[jsonStrings.length()];

        for(int i=0;i<strings.length;i++) {
            strings[i] = jsonStrings.getString(i);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

    super.onPostExecute(s);
}

}

我尝试编写的应用程序使用此JSON。

最佳答案

您没有正确解析嵌套的JsonArray。

这里genre_ids数组在results数组下

使用以下代码：

try {
    JSONObject jsonObject = new JSONObject(s);  //string pass to your onPostExecute()
    JSONArray result = jsonObject.getJSONArray("results");
    for(int j=0;i<result.length;j++) {
        JSONObject inner = result.getJSONObject(j);
        JSONArray jsonStrings = inner.getJSONArray("genre_ids");
        String strings[] = new String[jsonStrings.length()];
        for(int i=0;i<strings.length;i++) {
            strings[i] = jsonStrings.getString(i);
        }
    }
} catch (JSONException e) {
    e.printStackTrace();
}

关于java - JSON异常(exception):无值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45199963/