org.json.JSONException：在 android 的字符 0 处输入结束

Question

我正在实施一个 android 应用程序并尝试制作一个注册和登录屏幕。 我的应用程序已连接到服务器，这是我的代码出错的部分：

public void onResponse(String response) {
            Log.d(TAG, "Register Response: " + response.toString());
            hideDialog();

            try {
                JSONObject jObj = new JSONObject(response);
                boolean error = jObj.getBoolean("error");
                if (!error)
                {
                    // User successfully stored in MySQL
                    // Now store the user in sqlite
                    String uid = jObj.getString("uid");

                    JSONObject user = jObj.getJSONObject("user");
                    String name = user.getString("name");
                    String email = user.getString("email");
                    String created_at = user
                            .getString("created_at");

                    // Inserting row in users table
                    db.addUser(name, email, uid, created_at);

                    Toast.makeText(getApplicationContext(), "User successfully registered. Try login now!", Toast.LENGTH_LONG).show();

                    // Launch login activity
                    Intent intent = new Intent(
                            RegisterActivity.this,
                            LoginActivity.class);
                    startActivity(intent);
                    finish();
                } else
                {

                    // Error occurred in registration. Get the error
                    // message
                    String errorMsg = jObj.getString("error_msg");
                    Toast.makeText(getApplicationContext(), errorMsg, Toast.LENGTH_LONG).show();
                    Log.d("Debug", errorMsg);

                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

        }
    }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e(TAG, "Registration Error: " + error.toString());
            Toast.makeText(getApplicationContext(),
                    error.getMessage(), Toast.LENGTH_LONG).show();
            hideDialog();
        }
    }) {

这是我的错误：org.json.JSONException: End of input at character 0 of. 实际上我在这个网站上看到过类似的问题，但我无法解决我的问题

更新：这是我的 logcat 内容，响应前面没有任何内容：

 1576-1576/com.example.neshat.androidhive2 D/RegisterActivity﹕ Register Response:
12-21 09:43:08.820    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ org.json.JSONException: End of input at character 0 of
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at org.json.JSONTokener.nextValue(JSONTokener.java:97)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:156)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:173)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.example.neshat.androidhive2.RegisterActivity$3.onResponse(RegisterActivity.java:124)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.example.neshat.androidhive2.RegisterActivity$3.onResponse(RegisterActivity.java:116)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:739)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5221)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
12-21 09:43:08.824    1576-1576/com.example.neshat.androidhive2 W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Answer 1

正如您在 logcat 1576-1576/com.example.neshat.androidhive2 D/RegisterActivity﹕ Register Response:中看到的，这是Log.d(TAG, "Register Response: " + response.toString());的结果 , response是一个空字符串，所以你的应用程序将得到org.json.JSONException: End of input at character 0 of at the line JSONObject jObj = new JSONObject(response); .

您应该首先检查response是否为 null 且不是空字符串。

Answer 2

如果您使用 php 获取响应，则应检查您的 php 文件。 我和你有同样的问题，我忘了在我的 php 文件上写下响应。 以下是我忘记的部分代码

$response = new emp();
$response->success = 1;
$response->message = "Register success, please login.";
die(json_encode($response));