jsonparser给错误应用程序不插入数据

时间：2015-10-25 10:23:32

标签： android json

我正在研究json解析器，我正在通过观看演示制作应用程序 我按照他们在演示中说的一行一行完成，但我的应用程序不起作用 我的问题的答案不在该网站上，请提前感谢指导我

我的日志猫是

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)

我的主要活动是

package com.example.ahmed.json;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity
    implements OnClickListener {
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
 EditText txtnewidiom;
 EditText txtmeaning;
private Button btnsavenew;
private int success;
private static String url_insert_new = "http://10.0.2.2/idiomjson/insertnew.php";
private static final String TAG_SUCCESS = "success";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    txtnewidiom = (EditText) findViewById(R.id.txtnewidiom);
    txtmeaning = (EditText) findViewById(R.id.txtmeaning);
    btnsavenew = (Button) findViewById(R.id.btnsavenew);
    btnsavenew.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    if
            (v.getId() == R.id.btnsavenew) {
        new InsertNewIdiom().execute();

        if (success == 1) {
            Toast.makeText(getApplicationContext(), "New idiom saved...", Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(getApplicationContext(), "New idiom FAILED to saved...", Toast.LENGTH_LONG).show();
        }
    }
}

class InsertNewIdiom extends AsyncTask<String, String, String> {
    String entry = txtnewidiom.getText().toString();
    String meaning = txtmeaning.getText().toString();

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Saving the new IDIOM (" + entry + ")...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    protected String doInBackground(String... args) {
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("entry", entry));
        params.add(new BasicNameValuePair("meaning", meaning));
        JSONObject json = jsonParser.makeHttpRequest(url_insert_new, "GET", params);
        Log.d("Insert New Idiom Response", json.toString());
        try {
            success = json.getInt(TAG_SUCCESS);
            if (success == 1) { // successfully save new idiom
            } else {
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }

    protected void onPostExecute(String file_url) {
        pDialog.dismiss();
    }
}
}

json解析器的类是

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;
}
    }

在json上尝试if else后会出现此错误

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)
抱歉，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);
}

?>

2 个答案:

答案 0 :(得分：0)

  

引起：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）

使用前请确保json != null。

因为jsonParser.makeHttpRequest(url_insert_new, "GET", params);可以返回null值。

答案 1 :(得分：0)

  

10-25 15：16：14.516 1996-2310 / com.example.ahmed.json E / AndroidRuntime：引起：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)

l = 6 z = 0 while z < l: print(z) z = z + 1 l = 10 返回jsonParser.makeHttpRequest(url_insert_new, "GET", params);。 也许这个本地网址null是一个例子，对你无效。

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