本文介绍了JSON jparser 上的应用程序崩溃发出 http 请求的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
您好，我使用本教程连接到 web 或本地的 mySQL 数据库.这里虽然所有服务器端的 php 文件都是正确的并且可以在浏览器上运行，但是在 Android 端，应用程序在这一行崩溃:
hi i use this tutorial for connecting to the mySQL db on the web or local. here although the all server side php files are correct and works on the browser, but in Android side the app crashes on this line:
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
带有此消息:不幸的是，应用程序已停止！
with this message: unfortunately app has stopped!
我在教程页面评论中发现我应该更改 apache 服务器上的一些设置.这是我的代码:
i find out on tutorial page comments that i should change some setting on apache server. here is my code:
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://127.0.0.1/android/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);
StrictMode.enableDefaults();
// 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> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.i("LOG", "load data preexecute");
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) {
Log.i("LOG", "load data inback ");
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
Log.i("LOG", "load data inback json 1 ");
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
Log.i("LOG", "load data inback json 2 "+json.toString());
// Check your log cat for JSON reponse
try {
Log.i("LOG", "load data inback json json 3");
// Checking for SUCCESS TAG
int 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);
Log.i("LOG", "load data inback json json 4");
}
} else {
Log.i("LOG", "load data inback json json 5");
// 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);
}
Log.i("All Products: ","success:"+ success+"");
} catch (JSONException e) {
e.printStackTrace();
Log.i("LOG", "load data inback json on catch");
}
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);
}
});
}
}
}
这是日志猫:
01-11 13:49:19.163: E/Trace(2045): error opening trace file: No such file or directory (2)
01-11 13:49:19.642: D/gralloc_goldfish(2045): Emulator without GPU emulation detected.
01-11 13:49:26.103: I/LOG(2045): load data preexecute
01-11 13:49:26.583: D/dalvikvm(2045): GC_FOR_ALLOC freed 78K, 3% free 8222K/8391K, paused 155ms, total 170ms
01-11 13:49:26.793: I/LOG(2045): load data inback
01-11 13:49:26.793: I/LOG(2045): load data inback json 1
01-11 13:49:27.022: I/Choreographer(2045): Skipped 38 frames! The application may be doing too much work on its main thread.
01-11 13:49:27.923: W/System.err(2045): org.apache.http.conn.HttpHostConnectException: Connection to http://127.0.0.1 refused
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
01-11 13:49:27.933: W/System.err(2045): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
01-11 13:49:27.933: W/System.err(2045): at com.mjs.test.phptest92.core.JSONParser.makeHttpRequest(JSONParser.java:61)
01-11 13:49:27.943: W/System.err(2045): at com.mjs.test.phptest92.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:138)
01-11 13:49:27.943: W/System.err(2045): at com.mjs.test.phptest92.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:1)
01-11 13:49:27.943: W/System.err(2045): at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-11 13:49:27.943: W/System.err(2045): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-11 13:49:27.943: W/System.err(2045): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-11 13:49:27.943: W/System.err(2045): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-11 13:49:27.953: W/System.err(2045): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-11 13:49:27.953: W/System.err(2045): at java.lang.Thread.run(Thread.java:856)
01-11 13:49:27.953: W/System.err(2045): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 80): connect failed: ECONNREFUSED (Connection refused)
01-11 13:49:28.023: W/System.err(2045): at libcore.io.IoBridge.connect(IoBridge.java:114)
01-11 13:49:28.023: W/System.err(2045): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
01-11 13:49:28.033: W/System.err(2045): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
01-11 13:49:28.033: W/System.err(2045): at java.net.Socket.connect(Socket.java:842)
01-11 13:49:28.033: W/System.err(2045): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
01-11 13:49:28.033: W/System.err(2045): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
01-11 13:49:28.033: W/System.err(2045): ... 15 more
01-11 13:49:28.033: W/System.err(2045): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
01-11 13:49:28.043: W/System.err(2045): at libcore.io.Posix.connect(Native Method)
01-11 13:49:28.053: W/System.err(2045): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
01-11 13:49:28.053: W/System.err(2045): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
01-11 13:49:28.053: W/System.err(2045): at libcore.io.IoBridge.connect(IoBridge.java:112)
01-11 13:49:28.053: W/System.err(2045): ... 20 more
01-11 13:49:28.053: E/Buffer Error(2045): Error converting result java.lang.NullPointerException
01-11 13:49:28.093: E/JSON Parser(2045): Error parsing data org.json.JSONException: End of input at character 0 of
01-11 13:49:28.123: W/dalvikvm(2045): threadid=11: thread exiting with uncaught exception (group=0x40a13300)
01-11 13:49:28.143: E/AndroidRuntime(2045): FATAL EXCEPTION: AsyncTask #1
01-11 13:49:28.143: E/AndroidRuntime(2045): java.lang.RuntimeException: An error occured while executing doInBackground()
01-11 13:49:28.143: E/AndroidRuntime(2045): at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.lang.Thread.run(Thread.java:856)
01-11 13:49:28.143: E/AndroidRuntime(2045): Caused by: java.lang.NullPointerException
01-11 13:49:28.143: E/AndroidRuntime(2045): at com.mjs.test.phptest92.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:141)
01-11 13:49:28.143: E/AndroidRuntime(2045): at com.mjs.test.phptest92.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:1)
01-11 13:49:28.143: E/AndroidRuntime(2045): at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-11 13:49:28.143: E/AndroidRuntime(2045): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-11 13:49:28.143: E/AndroidRuntime(2045): ... 4 more
01-11 13:49:28.843: I/Choreographer(2045): Skipped 76 frames! The application may be doing too much work on its main thread.
01-11 13:49:29.163: I/Choreographer(2045): Skipped 89 frames! The application may be doing too much work on its main thread.
01-11 13:49:29.713: E/WindowManager(2045): Activity com.mjs.test.phptest92.AllProductsActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41223f00 that was originally added here
01-11 13:49:29.713: E/WindowManager(2045): android.view.WindowLeaked: Activity com.mjs.test.phptest92.AllProductsActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41223f00 that was originally added here
01-11 13:49:29.713: E/WindowManager(2045): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:374)
01-11 13:49:29.713: E/WindowManager(2045): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:292)
01-11 13:49:29.713: E/WindowManager(2045): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
01-11 13:49:29.713: E/WindowManager(2045): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
01-11 13:49:29.713: E/WindowManager(2045): at android.view.Window$LocalWindowManager.addView(Window.java:547)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.Dialog.show(Dialog.java:277)
01-11 13:49:29.713: E/WindowManager(2045): at com.mjs.test.phptest92.AllProductsActivity$LoadAllProducts.onPreExecute(AllProductsActivity.java:124)
01-11 13:49:29.713: E/WindowManager(2045): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
01-11 13:49:29.713: E/WindowManager(2045): at android.os.AsyncTask.execute(AsyncTask.java:534)
01-11 13:49:29.713: E/WindowManager(2045): at com.mjs.test.phptest92.AllProductsActivity.onCreate(AllProductsActivity.java:62)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.Activity.performCreate(Activity.java:5008)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.ActivityThread.access$600(ActivityThread.java:130)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
01-11 13:49:29.713: E/WindowManager(2045): at android.os.Handler.dispatchMessage(Handler.java:99)
01-11 13:49:29.713: E/WindowManager(2045): at android.os.Looper.loop(Looper.java:137)
01-11 13:49:29.713: E/WindowManager(2045): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-11 13:49:29.713: E/WindowManager(2045): at java.lang.reflect.Method.invokeNative(Native Method)
01-11 13:49:29.713: E/WindowManager(2045): at java.lang.reflect.Method.invoke(Method.java:511)
01-11 13:49:29.713: E/WindowManager(2045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-11 13:49:29.713: E/WindowManager(2045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-11 13:49:29.713: E/WindowManager(2045): at dalvik.system.NativeStart.main(Native Method)
01-11 13:49:29.713: I/Choreographer(2045): Skipped 32 frames! The application may be doing too much work on its main thread.
我该如何解决这个问题?
how i can solve this problem?
推荐答案
如果您从您的设备中引用 localhost 而不是使用 http://10.0.2.2:8080/ 而不是 http://127.0.0.1/ 或 http://localhost/.
If you are referring to a localhost from your device than use the http://10.0.2.2:8080/ instead of the http://127.0.0.1/ or http://localhost/.
因为您的 Android 模拟器运行在 Virtual Machine(QEMU) 上，而您无法连接到直接在您的 PC 上运行的服务器.
Because your Android emulator is running on a Virtual Machine(QEMU) and you can not connect to a server directly running on your PC.
如果您从物理 android 设备运行您的应用程序，请使用您 PC 上的网络 IP.例如 http://198.10.12.21:80/....
And If you running your app from Physical android device then please use your network ip from your PC.
for example http://198.10.12.21:80/....
这篇关于JSON jparser 上的应用程序崩溃发出 http 请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！
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