您好我正在尝试创建一个向服务器发送变量的应用程序,但当我尝试将响应发送到服务器时它仍然死亡
这是代码
package com.example.door;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button opendoor;
Button closedoor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Make Object for Buttons
// sendButton = (Button) findViewById(R.id.sendButton);
Button openbutton = (Button) findViewById(R.id.openButton);
Button closebutton = (Button) findViewById(R.id.closeButton);
}
//When the send button is clicked
public void open(View v)
{
String server ="http://devel.foo.bar/04r0450240";
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost =new HttpPost(server);
try{
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("led", "1"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
try {
httpclient.execute(httppost);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} catch (IOException e) {
// TODO Auto-generated catch block
Log.i("HTTP Failed", e.toString());
}
return;
}
public void close(View v){
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://devel.foo.bar/04r0450240");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("led", "0"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
错误 11-01 03:55:04.622:E / AndroidRuntime(1612):致命异常:主要 11-01 03:55:04.622:E / AndroidRuntime(1612):java.lang.IllegalStateException:无法执行活动的方法 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.view.View $ 1.onClick(View.java:3633) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.view.View.performClick(View.java:4240) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.view.View $ PerformClick.run(View.java:17721) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.os.Handler.handleCallback(Handler.java:730) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.os.Handler.dispatchMessage(Handler.java:92) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.os.Looper.loop(Looper.java:137) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.app.ActivityThread.main(ActivityThread.java:5103) 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.lang.reflect.Method.invokeNative(Native Method) 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.lang.reflect.Method.invoke(Method.java:525) 11-01 03:55:04.622:E / AndroidRuntime(1612):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:737) 11-01 03:55:04.622:E / AndroidRuntime(1612):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-01 03:55:04.622:E / AndroidRuntime(1612):at dalvik.system.NativeStart.main(Native Method) 11-01 03:55:04.622:E / AndroidRuntime(1612):引起:java.lang.reflect.InvocationTargetException 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.lang.reflect.Method.invokeNative(Native Method) 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.lang.reflect.Method.invoke(Method.java:525) 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.view.View $ 1.onClick(View.java:3628) 11-01 03:55:04.622:E / AndroidRuntime(1612):... 11更多 11-01 03:55:04.622:E / AndroidRuntime(1612):引起:android.os.NetworkOnMainThreadException 11-01 03:55:04.622:E / AndroidRuntime(1612):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 11-01 03:55:04.622:E / AndroidRuntime(1612):at java.net.InetAddress.getAllByName(InetAddress.java:214) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 11-01 03:55:04.622:E / AndroidRuntime(1612):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 11-01 03:55:04.622:E / AndroidRuntime(1612):at com.example.door.MainActivity.open(MainActivity.java:51) 11-01 03:55:04.622:E / AndroidRuntime(1612):... 14更多 11-01 03:55:09.212:I / Process(1612):发送信号。 PID:1612 SIG:9
提前致谢 杰夫
答案 0 :(得分:1)
您正尝试从应用程序的UI线程启动网络连接,这是Android SDK不允许的。
您可以将Android SDK中提供的AsyncTask类子类化,以将网络调用分离为单独的线程。
这是链接 http://developer.android.com/reference/android/os/AsyncTask.html
希望它有所帮助。
答案 1 :(得分:0)
尝试在onCreate()
方法
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
答案 2 :(得分:0)
您需要将请求的方法移动到后台线程中。我建议使用AsyncTask。 你可以这样做:
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button opendoor;
Button closedoor;
private static final int CLOSE_METHOD = 1;
private static final int OPEN_METHOD = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Make Object for Buttons
// sendButton = (Button) findViewById(R.id.sendButton);
Button openbutton = (Button) findViewById(R.id.openButton);
Button closebutton = (Button) findViewById(R.id.closeButton);
}
// When the send button is clicked
public void open(View v) {
BackgroundTask openTask = new BackgroundTask();
openTask.execute(OPEN_METHOD);
return;
}
public void close(View v) {
BackgroundTask closeTask = new BackgroundTask();
closeTask.execute(CLOSE_METHOD);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class BackgroundTask extends AsyncTask<Integer, Void, String> {
@Override
protected String doInBackground(Integer... params) {
switch (params[0]) {
case CLOSE_METHOD:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://devel.foo.bar/04r0450240");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
1);
nameValuePairs.add(new BasicNameValuePair("led", "0"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
break;
case OPEN_METHOD:
String server = "http://devel.foo.bar/04r0450240";
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(server);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
1);
nameValuePairs.add(new BasicNameValuePair("led", "1"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
try {
httpclient.execute(httppost);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} catch (IOException e) {
// TODO Auto-generated catch block
Log.i("HTTP Failed", e.toString());
}
break;
}
return null;
}
@Override
protected void onPostExecute(String result) {
// Here you can do something after the Asynctask has finished.
super.onPostExecute(result);
}
}
}
这个想法是Android不允许你在主线程上进行网络操作。在你的情况下,AsyncTask是最好的解决方案...它还有在doInBackground启动之前调用的onPreExecute()方法,这里你可以为进程做一些初始化,或者你可以在onPostExecute()中显示一个加载窗口并将其解除方法
希望这会对你有所帮助。