volley出现的获取数据异常

使用了request.start()，所以才导致的问题。

public static void RequstGet_JSONObject() {
        request.cancelAll(tag);
        jsonObjectRequest.setTag(tag);
        request.add(jsonObjectRequest);
        request.start();
}

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因为在volley在初始化RequestQueue时，已经调用了start方法。

public static RequestQueue newRequestQueue(Context context, HttpStack stack) {
    File cacheDir = new File(context.getCacheDir(), DEFAULT_CACHE_DIR);

    String userAgent = "volley/0";
    try {
        String packageName = context.getPackageName();
        PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
        userAgent = packageName + "/" + info.versionCode;
    } catch (NameNotFoundException e) {
    }

    if (stack == null) {
        if (Build.VERSION.SDK_INT >= 9) {
            stack = new HurlStack();
        } else {
            // Prior to Gingerbread, HttpUrlConnection was unreliable.
            // See: http://android-developers.blogspot.com/2011/09/androids-http-clients.html
            stack = new HttpClientStack(AndroidHttpClient.newInstance(userAgent));
        }
    }

    Network network = new BasicNetwork(stack);

    RequestQueue queue = new RequestQueue(new DiskBasedCache(cacheDir), network);
    queue.start();

    return queue;
}

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解决方法：

去掉request.start()，即可。

public static void RequstGet_JSONObject() {
        request.cancelAll(tag);
        jsonObjectRequest.setTag(tag);
        request.add(jsonObjectRequest);
}

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