Question

我不知道怎么在android中调用这个json数组...我试过下面的数组类型调用但是没有用，建议PLZ

["a","b","c","d"]

我的java

 JSONArray arrays = null;
JSONObject object = null;
// TODO Auto-generated method stub
super.onPostExecute(result);
String jsonResult=result;
try 
{
object = new JSONObject(jsonResult);
} 
catch (JSONException e) 
{
// TODO Auto-generated catch block
e.printStackTrace();
}
arrays = new JSONArray(result);
object=arrays.getJSONObject(0);
textView.setText(object[0]+""object[1]));

logcat的

03-06 09:06:40.272: E/AndroidRuntime(5545): FATAL EXCEPTION: main
03-06 09:06:40.272: E/AndroidRuntime(5545): Process: com.example.loading_mysql, PID: 5545
03-06 09:06:40.272: E/AndroidRuntime(5545): java.lang.NullPointerException
03-06 09:06:40.272: E/AndroidRuntime(5545):     at com.example.loading_mysql.MainActivity$JSONParser.onPostExecute(MainActivity.java:100)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at com.example.loading_mysql.MainActivity$JSONParser.onPostExecute(MainActivity.java:1)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at android.os.AsyncTask.finish(AsyncTask.java:632)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at android.os.AsyncTask.access$600(AsyncTask.java:177)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at android.os.Looper.loop(Looper.java:137)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at android.app.ActivityThread.main(ActivityThread.java:4998)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at java.lang.reflect.Method.invokeNative(Native Method)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at java.lang.reflect.Method.invoke(Method.java:515)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-06 09:06:40.272: E/AndroidRuntime(5545):     at dalvik.system.NativeStart.main(Native Method)

我的postexecute ,,,添加代码后你说,,,不起作用stilllkgjkgkgv gdsghsadgsg

protected void onPostExecute(String result) {
            String value = null;
            JSONArray jr = null;
            try {
                jr = new JSONArray(result);
            } catch (JSONException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

                try {
                    value =jr.getString(0);
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            textView.setText(value);
            }

Answer 1

你拥有的是JSONArray。下面的json中没有JSONObject。

[
    "a",
    "b",
    "c",
    "d"
]

解析

JSONArray jr = new JSONArray(jsonResult);
for(int i=0;i<jr.length();i++)
{
    String value = (String) jr.get(i);
}

[表示json数组节点

{表示json对象节点

澄清评论中的问题

{
    "name": "Froyo",
    "version": "Android 2.2"
}

以上是json对象

编辑：

@Override 
 protected void onPostExecute(String result)
    { 
        super.onPostExecute(result);
        String value = null;
        try {
             JSONArray jr = new JSONArray(result);
             value =(String) jr.get(0);
             textView.setText(value)
            } catch (JSONException e1) 
            {   
            e1.printStackTrace();
            }
     }

Android如何调用这个json数组......？

1 个答案: