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Я пытаюсь получить данные с помощью json parser, но я получаю ошибку буфера, разбор ошибки и т. Д. Помогите мне, коды приведены ниже .......Ошибка Ошибка преобразования результата java.lang.NullPointerException
журнал кошка ....
12-03 11:47:20.175: E/Buffer Error(4082): Error converting result java.lang.NullPointerException
12-03 11:47:20.175: E/JSON Parser(4082): Error parsing data org.json.JSONException: End of input at character 0 of
12-03 11:47:20.175: W/dalvikvm(4082): threadid=8: thread exiting with uncaught exception (group=0x2aacc7d0)
12-03 11:47:20.175: E/AndroidRuntime(4082): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
12-03 11:47:20.185: I/global(4082): Default buffer size used in BufferedWriter constructor. It would be better to be explicit if an 8k-char buffer is required.
12-03 11:47:20.195: I/klogd(117): [ 9721.632072] Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
12-03 11:47:20.225: I/global(4082): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required.
12-03 11:47:20.275: W/System.err(4082): java.io.IOException: Permission denied
12-03 11:47:20.285: I/global(4082): Default buffer size used in BufferedWriter constructor. It would be better to be explicit if an 8k-char buffer is required.
12-03 11:47:20.285: E/AndroidRuntime(4082): FATAL EXCEPTION: AsyncTask #1
12-03 11:47:20.285: E/AndroidRuntime(4082): java.lang.RuntimeException: An error occured while executing doInBackground()
12-03 11:47:20.285: E/AndroidRuntime(4082): at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.lang.Thread.run(Thread.java:1096)
12-03 11:47:20.285: E/AndroidRuntime(4082): Caused by: java.lang.NullPointerException
12-03 11:47:20.285: E/AndroidRuntime(4082): at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:131)
12-03 11:47:20.285: E/AndroidRuntime(4082): at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:1)
12-03 11:47:20.285: E/AndroidRuntime(4082): at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-03 11:47:20.285: E/AndroidRuntime(4082): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-03 11:47:20.285: E/AndroidRuntime(4082): ... 4
Класс активности ..........
package com.example.androidhive;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class AllProductsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products =//"http://api.androidhive.info/android_connect/get_all_products.php";
"http://10.0.2.2:80/android_connect/get_all_products.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_products);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String pid = ((TextView) view.findViewById(R.id.pid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
EditProductActivity.class);
// sending pid to next activity
in.putExtra(TAG_PID, pid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
int success;
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
/* pDialog = new ProgressDialog(AllProductsActivity.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show(); */
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
//pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AllProductsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
Php file.......
<?php
//header('content-type: application/json; charset=utf-8');
/*
* Following code will list all the products
*/
// array for JSON response
$response = array();
// include db connect class
require_once('db_connect.php');
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
$result = mysql_query("SELECT * FROM products") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["products"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$product = array();
$product["pid"] = $row["pid"];
$product["name"] = $row["name"];
$product["price"] = $row["price"];
$product["description"] = $row["description"];
$product["created_at"] = $row["created_at"];
$product["updated_at"] = $row["updated_at"];
// push single product into final response array
array_push($response["products"], $product);
}
// success
$response["success"] = 1;
// echoing JSON response
print json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No products found";
// echo no users JSON
echo json_encode($response);
}
?>
Php file.......
<?php
//header('content-type: application/json; charset=utf-8');
/*
* Following code will list all the products
*/
// array for JSON response
$response = array();
// include db connect class
require_once('db_connect.php');
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
$result = mysql_query("SELECT * FROM products") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["products"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$product = array();
$product["pid"] = $row["pid"];
$product["name"] = $row["name"];
$product["price"] = $row["price"];
$product["description"] = $row["description"];
$product["created_at"] = $row["created_at"];
$product["updated_at"] = $row["updated_at"];
// push single product into final response array
array_push($response["products"], $product);
}
// success
$response["success"] = 1;
// echoing JSON response
print json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No products found";
// echo no users JSON
echo json_encode($response);
}
?>
Какой ваш фактический ответ JSON? – GrIsHu