Android jsonparser给定错误应用程序不插入数据_Android_Json

Android jsonparser给定错误应用程序不插入数据

android json

Android jsonparser给定错误应用程序不插入数据,android,json,Android,Json,我正在学习json解析器，并通过观看演示制作了一个应用程序我按照他们在演示中说的一行一行地做，但我的应用程序不起作用我的问题的答案不在那个网站上，请引导我提前感谢我的原木猫是 10-25 15:16:05.766 1996-1996/com.example.ahmed.json E/Trace: error opening trace file: No such file or directory (2) 10-25 15:16:14.484 1996-2310/com.example.a

我正在学习json解析器，并通过观看演示制作了一个应用程序我按照他们在演示中说的一行一行地做，但我的应用程序不起作用我的问题的答案不在那个网站上，请引导我提前感谢

我的原木猫是

10-25 15:16:05.766 1996-1996/com.example.ahmed.json E/Trace: error opening trace file: No such file or directory (2)
10-25 15:16:14.484 1996-2310/com.example.ahmed.json E/Buffer Error: Error converting result java.lang.NullPointerException
10-25 15:16:14.484 1996-2310/com.example.ahmed.json E/JSON Parser: Error parsing data org.json.JSONException: End of input at character 0 of 
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at android.os.AsyncTask$3.done(AsyncTask.java:299)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:856)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:  Caused by: java.lang.NullPointerException
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at com.example.ahmed.json.MainActivity$InsertNewIdiom.doInBackground(MainActivity.java:76)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at com.example.ahmed.json.MainActivity$InsertNewIdiom.doInBackground(MainActivity.java:57)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at android.os.AsyncTask$2.call(AsyncTask.java:287)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:856) 
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager: Activity com.example.ahmed.json.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41972358 that was originally added here
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager: android.view.WindowLeaked: Activity com.example.ahmed.json.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41972358 that was originally added here
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:382)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:292)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.Window$LocalWindowManager.addView(Window.java:547)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.app.Dialog.show(Dialog.java:284)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at com.example.ahmed.json.MainActivity$InsertNewIdiom.onPreExecute(MainActivity.java:68)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.os.AsyncTask.execute(AsyncTask.java:534)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at com.example.ahmed.json.MainActivity.onClick(MainActivity.java:47)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.View.performClick(View.java:4106)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.view.View$PerformClick.run(View.java:17052)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.os.Handler.handleCallback(Handler.java:615)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.os.Handler.dispatchMessage(Handler.java:92)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.os.Looper.loop(Looper.java:137)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at android.app.ActivityThread.main(ActivityThread.java:5059)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at java.lang.reflect.Method.invokeNative(Native Method)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at java.lang.reflect.Method.invoke(Method.java:511)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
10-25 15:16:15.680 1996-1996/com.example.ahmed.json E/WindowManager:     at dalvik.system.NativeStart.main(Native Method)

对不起，我忘了给php文件

<?php
 //insertnew.php /* * Following code will create a new product row * All product details are read from HTTP GET Request */ // array for JSON response 
$response = array();
 // check for required fields 
if (isset($_GET['entry']) && isset($_GET['meaning'])) { 
$entry = $_GET['entry']; 
$meaning = $_GET['meaning'];
 // include db connect class 
require_once __DIR__ . '/connect.php';
 // connecting to db 
$db = new DB_CONNECT();
 // mysql inserting a new row (idioms) 
$result = mysql_query("INSERT INTO idiomlist(entry, meaning) VALUES('$entry', '$meaning')");
 // check if row inserted or not 
if ($result) { 
// successfully inserted into database 
$response["success"] = 1; $response["message"] = "new IDIOM saved...."; 
// echoing JSON response 
echo json_encode($response);
 }
else { 
// failed to insert row 
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response 
echo json_encode($response);
}
} 
else { 
// required field is missing 
$response["success"] = 0; 
$response["message"] = "Required field(s) is missing"; 
// echoing JSON response 
echo json_encode($response);
}

?>


原因：java.lang.NullPointerException10-25 15:16:14.516
1996-2310/com.example.ahmed.json E/AndroidRuntime:at
MainActivity$InsertNewIdiom.doInBackground（MainActivity.java:76）
确保json！=在使用它之前为空
因为jsonParser.makeHttpRequest（url\u insert\u new，“GET”，params）
可以返回null
值
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:原因：java.lang.NullPointerException
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:at com.example.ahmed.json.MainActivity$InsertNewIdiom.doInBackground（MainActivity.java:76）
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:at com.example.ahmed.json.MainActivity$InsertNewIdiom.doInBackground（MainActivity.java:57）
10-25 15:16:14.516 1996-2310/com.example.ahmed.json E/AndroidRuntime:at-android.os.AsyncTask$2.call（AsyncTask.java:287）
jsonParser.makeHttpRequest（url\u insert\u new，“GET”，params）返回null。
可能是本地urlhttp://10.0.2.2/idiomjson/insertnew.php
是exmaple，对您无效。我应该为本地数据库的默认值插入什么？我已经插入了值127.0.0.1，但仍然会给出相同的错误谢谢您的帮助，先生，请指导我该怎么做，我对此知之甚少先生，你是对的，它的值为null，我在if-else条件下检查它，if（json！=null）{do work}else{Toast.makeText（getApplicationContext（），“json值为null”，Toast.LENGTH_LONG.show（）；}，它显示值为null，现在它给出以下错误E/AndroidRuntime:at.JSONParser.makeHttpRequest（JSONParser.java:47）E/AndroidRuntime:at.MainActivity$InsertNewIdiom.doInBackground（MainActivity.java:75）E/AndroidRuntime:at.MainActivity.onClick（MainActivity.java:47）发布完整的logcat后，我们可以从这一部分找出错误的来源。当我尝试使用它时，它给出json null的值，它给出了新logcat中的错误
package com.example.ahmed.json;

import android.util.Log;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;    
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;


public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public JSONParser() {
}
public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params)
{  try
{
    if(method == "POST")
    {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        httpPost.setEntity(new UrlEncodedFormEntity(params));
        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();
    }
    else if(method == "GET"){
     DefaultHttpClient httpClient = new DefaultHttpClient();
        String paramString = URLEncodedUtils.format(params, "utf-8"); url += "?" + paramString;
        HttpGet httpGet = new HttpGet(url);
        HttpResponse httpResponse = httpClient.execute(httpGet);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();
    }
}
catch (UnsupportedEncodingException e) {
    e.printStackTrace();
}
catch (ClientProtocolException e) {
    e.printStackTrace();
}
catch (IOException e) {
    e.printStackTrace();
}
    try { BufferedReader reader = new BufferedReader(new InputStreamReader( is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null)
        { sb.append(line + "\n");
        }
        is.close(); json = sb.toString();
    }
    catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString()); }
         try {
             jObj = new JSONObject(json);
         }
         catch (JSONException e) {
             Log.e("JSON Parser", "Error parsing data " + e.toString());
         }
    return jObj;
}
    }

10-29 00:48:14.446 29434-29434/com.example.ahmed.json E/Trace: error opening trace file: No such file or directory (2)

10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime: FATAL EXCEPTION: main
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime: android.os.NetworkOnMainThreadException
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1131)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at libcore.io.IoBridge.connect(IoBridge.java:112)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:460)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at java.net.Socket.connect(Socket.java:832)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at com.example.ahmed.json.JSONParser.makeHttpRequest(JSONParser.java:47)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at com.example.ahmed.json.MainActivity$InsertNewIdiom.doInBackground(MainActivity.java:75)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at com.example.ahmed.json.MainActivity.onClick(MainActivity.java:47)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.view.View.performClick(View.java:4106)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:17052)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:615)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:92)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:137)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5059)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:511)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
10-29 00:48:39.017 29434-29434/com.example.ahmed.json E/AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method)

<?php
 //insertnew.php /* * Following code will create a new product row * All product details are read from HTTP GET Request */ // array for JSON response 
$response = array();
 // check for required fields 
if (isset($_GET['entry']) && isset($_GET['meaning'])) { 
$entry = $_GET['entry']; 
$meaning = $_GET['meaning'];
 // include db connect class 
require_once __DIR__ . '/connect.php';
 // connecting to db 
$db = new DB_CONNECT();
 // mysql inserting a new row (idioms) 
$result = mysql_query("INSERT INTO idiomlist(entry, meaning) VALUES('$entry', '$meaning')");
 // check if row inserted or not 
if ($result) { 
// successfully inserted into database 
$response["success"] = 1; $response["message"] = "new IDIOM saved...."; 
// echoing JSON response 
echo json_encode($response);
 }
else { 
// failed to insert row 
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response 
echo json_encode($response);
}
} 
else { 
// required field is missing 
$response["success"] = 0; 
$response["message"] = "Required field(s) is missing"; 
// echoing JSON response 
echo json_encode($response);
}

?>