如何解决 java.lang.String 类型的值 <br 无法转换为 JSONObject？

Question

我正在尝试将数据发送到服务器，我的应用程序崩溃并显示此错误，任何人都可以帮助我解决这个问题........

 Error Parsing dataorg.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
12-10 10:54:46.630: W/dalvikvm(870): threadid=11: thread exiting with uncaught exception (group=0x409961f8)
 FATAL EXCEPTION: AsyncTask #1
 java.lang.RuntimeException: An error occured while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:278)
    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
    at java.lang.Thread.run(Thread.java:856)
 Caused by: java.lang.NullPointerException
    at info.androidhive.slidingmenu.RegistrationForm$AttemptLogin.doInBackground(RegistrationForm.java:435)
    at info.androidhive.slidingmenu.RegistrationForm$AttemptLogin.doInBackground(RegistrationForm.java:1)
    at android.os.AsyncTask$2.call(AsyncTask.java:264)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    ... 5 more
 Activity info.androidhive.slidingmenu.RegistrationForm has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41888e70 that was originally added here
 android.view.WindowLeaked: Activity info.androidhive.slidingmenu.RegistrationForm has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41888e70 that was originally added here
    at android.view.ViewRootImpl.<init>(ViewRootImpl.java:343)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:245)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:193)
    at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:118)
    at android.view.Window$LocalWindowManager.addView(Window.java:537)
    at android.app.Dialog.show(Dialog.java:274)
    at info.androidhive.slidingmenu.RegistrationForm$AttemptLogin.onPreExecute(RegistrationForm.java:375)
    at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561)
    at android.os.AsyncTask.execute(AsyncTask.java:511)
    at info.androidhive.slidingmenu.RegistrationForm.onClick(RegistrationForm.java:291)
    at android.view.View.performClick(View.java:3480)
    at android.view.View$PerformClick.run(View.java:13983)
    at android.os.Handler.handleCallback(Handler.java:605)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4340)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    at dalvik.system.NativeStart.main(Native Method)

在这里检查我的代码 https://stackoverflow.com/questions/27393384/how-to-send-data-from-android-to-php-server-using-json?noredirect=1#comment43233981_27393384

Answer 1

logcat 的这一部分：

解析 dataorg.json.JSONException 时出错：java.lang.String 类型的值<br无法

最像你打了一个中断标签<br />.问题是您没有获得任何JSON数据。

您需要调查原因，可能的原因：

1. 网络问题
2. 权限问题
3. 无效响应

---

class AttemptLogin extends AsyncTask<String, String, String> {
    boolean failure = false;
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        ....
    }
    @SuppressWarnings("unused")
    @Override
    protected String doInBackground(String...args) {
        .....
        try {
            //Building Parameters
            .....
            json = jsonParser.makeHttpRequest (
            LOGIN_URL, "POST", params);
            Log.d("Request attempt", json.toString());
            JSONObject jobj = new JSONObject(json.toString());
            return jobj;
        }catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }
    protected void onPostExecute(JSONObject jobj) {
        pDialog.dismiss();
        try {
            if(jobj.getString(TAG_SUCCESS)){
                final String msg = jobj.getString("msg");
                Toast.makeText(
                      getApplicationContext(),msg, Toast.LENGTH_LONG)
                     .show();
            }else{
                System.out.println("FAIL !!");
            }
        }catch (JSONException e) {
            e.printStackTrace();
        }

    }
}