遵循Android HTTP示例/教程 – 问题实现网络活动的异步任务
我正在尝试遵循关于发布HTTP数据的教程，但由于IO线程上的网络活动，它强制关闭主线程，所以我试图实现AsyncTask（正如其他一些有用的SO用户所建议的那样 – 但是我已经屠杀了代码，整个enchilada部队关闭了我。）
🙁
Android Tutorial: How To Post Data From An Android App To a Website
提前致谢！
NoobNinja
JAVA：
import java.io.IOException; import org.apache.http.client.ClientProtocolException; import java.util.ArrayList; import android.os.AsyncTask; import java.util.List; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.message.BasicNameValuePair; // import everything you need import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class DeviceConfig extends Activity { AsyncTask saveContactTask = new AsyncTask() { @Override protected Object doInBackground(Object... params) { return null; } @Override protected void onPostExecute(Object result) { } @Override protected void saveContactTask.execute() { } ; @Override protected Object doInBackground(Object... params) { return null; } Button sendButton; EditText msgTextField; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // load the layout setContentView(R.layout.deviceconfig); // make message text field object msgTextField = (EditText) findViewById(R.id.msgTextField); // make send button object sendButton = (Button) findViewById(R.id.sendButton); } // this is the function that gets called when you click the button public void send(View v); protected void saveContactTask.execute(); // get the message from the message text box String msg = msgTextField.getText().toString(); { // make sure the fields are not empty if (msg.length()>0) { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://gamedemo.hostzi.com/test.php"); try { List nameValuePairs = new ArrayList(2); nameValuePairs.add(new BasicNameValuePair("id", "12345")); nameValuePairs.add(new BasicNameValuePair("message", msg)); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); httpclient.execute(httppost); msgTextField.setText(""); // clear text box } catch (ClientProtocolException e) { // TODO Auto-generated catch block } catch (IOException e) { // TODO Auto-generated catch block } } else { // display message if text fields are empty Toast.makeText(getBaseContext(),"All field are required",Toast.LENGTH_SHORT).show(); } } } XML：
PHP：
<?php // get the "message" variable from the post request // this is the data coming from the Android app $message=$_POST["message"]; // specify the file where we will save the contents of the variable message $filename="androidmessages.html"; // write (append) the data to the file file_put_contents($filename,$message."
",FILE_APPEND); // load the contents of the file to a variable $androidmessages=file_get_contents($filename); // display the contents of the variable (which has the contents of the file) echo $androidmessages; ?>
logcat的：
03-27 16:30:00.775: D/dalvikvm(14566): GC_FOR_ALLOC freed 88K, 3% free 7355K/7568K, paused 36ms, total 36ms 03-27 16:30:00.785: I/dalvikvm-heap(14566): Grow heap (frag case) to 10.818MB for 3686416-byte allocation 03-27 16:30:00.825: D/dalvikvm(14566): GC_FOR_ALLOC freed 1K, 2% free 10953K/11172K, paused 35ms, total 35ms 03-27 16:30:00.845: D/dalvikvm(14566): GC_CONCURRENT freed <1K, 2% free 10953K/11172K, paused 3ms+3ms, total 29ms 03-27 16:30:01.095: D/dalvikvm(14566): GC_FOR_ALLOC freed <1K, 2% free 10953K/11172K, paused 16ms, total 16ms 03-27 16:30:01.105: I/dalvikvm-heap(14566): Grow heap (frag case) to 17.043MB for 6529744-byte allocation 03-27 16:30:01.125: D/dalvikvm(14566): GC_FOR_ALLOC freed 0K, 2% free 17330K/17552K, paused 16ms, total 16ms 03-27 16:30:01.145: D/dalvikvm(14566): GC_CONCURRENT freed 0K, 2% free 17330K/17552K, paused 3ms+3ms, total 23ms 03-27 16:30:01.275: D/libEGL(14566): loaded /system/lib/egl/libEGL_tegra.so 03-27 16:30:01.285: D/libEGL(14566): loaded /system/lib/egl/libGLESv1_CM_tegra.so 03-27 16:30:01.295: D/libEGL(14566): loaded /system/lib/egl/libGLESv2_tegra.so 03-27 16:30:01.325: D/OpenGLRenderer(14566): Enabling debug mode 0 03-27 16:30:03.325: D/AndroidRuntime(14566): Shutting down VM 03-27 16:30:03.325: W/dalvikvm(14566): threadid=1: thread exiting with uncaught exception (group=0x41cd2930) 03-27 16:30:03.325: E/AndroidRuntime(14566): FATAL EXCEPTION: main 03-27 16:30:03.325: E/AndroidRuntime(14566): java.lang.Error: Unresolved compilation problems: 03-27 16:30:03.325: E/AndroidRuntime(14566): Syntax error on token ".", ; expected 03-27 16:30:03.325: E/AndroidRuntime(14566): Syntax error, insert ";" to complete FieldDeclaration 03-27 16:30:03.325: E/AndroidRuntime(14566): Syntax error, insert "}" to complete ClassBody 03-27 16:30:03.325: E/AndroidRuntime(14566): at com.nfc.linkingmanager.DeviceConfig.(DeviceConfig.java:48) 03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.Class.newInstanceImpl(Native Method) 03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.Class.newInstance(Class.java:1319) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.Instrumentation.newActivity(Instrumentation.java:1054) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.access$600(ActivityThread.java:141) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.os.Handler.dispatchMessage(Handler.java:99) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.os.Looper.loop(Looper.java:137) 03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.main(ActivityThread.java:5041) 03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.reflect.Method.invokeNative(Native Method) 03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.reflect.Method.invoke(Method.java:511) 03-27 16:30:03.325: E/AndroidRuntime(14566): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 03-27 16:30:03.325: E/AndroidRuntime(14566): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 03-27 16:30:03.325: E/AndroidRuntime(14566): at dalvik.system.NativeStart.main(Native Method)
NetworkOnMainThreadException
您正在获得exception，因为您正在主线程上进行网络操作，这不允许Android版本> = 3.0。
使用AsyncTask进行网络操作。
在doInBackground()方法中进行网络操作。
阅读AsyncTask的 android文档。