我们想在我们的服务器上运行一个php脚本,使用HttpClient和HttpPost将数据(在变量nameValuePairs中)插入到我们的数据库中.如果我们使用Idea IntelliJ创建以下代码作为Android应用程序,它可以正常工作.但是如果它是在Eclipse中创建的,则应用程序会在.execute()方法中崩溃,并抛出一个正常的异常"null".
HttpClient httpclient = new DefaultHttpClient(httpParameters); HttpPost httppost = new HttpPost("http://bbpf.bplaced.net/insert.php"); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); httpclient.execute(httppost);
您是否熟悉该问题或为什么在Eclipse中创建的相同程序崩溃并在IntelliJ中运行?
编辑:这是Eclipse中的错误日志:
04-04 08:11:33.429: E/AndroidRuntime(2888): FATAL EXCEPTION: main 04-04 08:11:33.429: E/AndroidRuntime(2888): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mobile.inserttest/com.mobile.inserttest.MainActivity}: android.os.NetworkOnMainThreadException 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.ActivityThread.access$600(ActivityThread.java:127) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.os.Handler.dispatchMessage(Handler.java:99) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.os.Looper.loop(Looper.java:137) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.ActivityThread.main(ActivityThread.java:4441) 04-04 08:11:33.429: E/AndroidRuntime(2888): at java.lang.reflect.Method.invokeNative(Native Method) 04-04 08:11:33.429: E/AndroidRuntime(2888): at java.lang.reflect.Method.invoke(Method.java:511) 04-04 08:11:33.429: E/AndroidRuntime(2888): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-04 08:11:33.429: E/AndroidRuntime(2888): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-04 08:11:33.429: E/AndroidRuntime(2888): at dalvik.system.NativeStart.main(Native Method) 04-04 08:11:33.429: E/AndroidRuntime(2888): Caused by: android.os.NetworkOnMainThreadException 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1108) 04-04 08:11:33.429: E/AndroidRuntime(2888): at java.net.InetAddress.lookupHostByName(InetAddress.java:391) 04-04 08:11:33.429: E/AndroidRuntime(2888): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242) 04-04 08:11:33.429: E/AndroidRuntime(2888): at java.net.InetAddress.getAllByName(InetAddress.java:220) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:580) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:512) 04-04 08:11:33.429: E/AndroidRuntime(2888): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:490) 04-04 08:11:33.429: E/AndroidRuntime(2888): at com.mobile.inserttest.DBConnection.insert(DBConnection.java:170) 04-04 08:11:33.429: E/AndroidRuntime(2888): at com.mobile.inserttest.MainActivity.onCreate(MainActivity.java:29) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.Activity.performCreate(Activity.java:4465) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 04-04 08:11:33.429: E/AndroidRuntime(2888): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931) 04-04 08:11:33.429: E/AndroidRuntime(2888): ... 11 more
谢谢大家的帮助!
您应该在单独的线程中发出HTTP请求.NetworkOnMainThreadException
说您正在尝试在主线程上进行网络操作.
developer.android.com上的文档
1]使用简单的线程
Thread t = new Thread(new Runnable() { @Override public void run() { HttpClient httpclient = new DefaultHttpClient(httpParameters); HttpPost httppost = new HttpPost("http://bbpf.bplaced.net/insert.php"); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); httpclient.execute(httppost); } }); t.start();
2]如果您想要更多地控制任务,可以使用AsyncTask:
AsyncTaskasyncTask = new AsyncTask () { @Override protected Void doInBackground(Void... params) { ttpClient httpclient = new DefaultHttpClient(httpParameters); HttpPost httppost = new HttpPost("http://bbpf.bplaced.net/insert.php"); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); httpclient.execute(httppost); return null; } @Override protected void onPostExecute(Void aVoid) { // Notifies UI when the task is done textView.setText("Insert finished!"); } }.execute();
3]使用一些网络库(robospice,改造),以书面形式异步网络任务变得更轻松.