通过服务发布数据会导致应用程序崩溃。
通过服务发布数据会导致应用程序崩溃。
我正在尝试通过后台服务向web服务器提交数据。\n函数PostData将数据发送到服务器，但当我添加它时，程序显示：\n
\n不幸的是，程序停止工作\n
\n这是我的代码：\n
package com.yahya.trackingsysem;
import java.io.IOException;
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.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.widget.Toast;
public class MyService extends Service {
Handler handler=new Handler();
String info;
@Override
public void onCreate() {
hello();
}
void hello(){
final Runnable r = new Runnable()
{
public void run()
{
Toast.makeText(getApplicationContext(), "Starting service", Toast.LENGTH_LONG).show();
////////////////////
postData();
////////////////////
handler.postDelayed(this, 10000);
}
};
handler.postDelayed(r, 10000);
}
//********************* 发送函数
public void postData() {
// 创建一个新的HttpClient和Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.webserver.net/tracker.php");
try {
// 添加数据
List nameValuePairs = new ArrayList(1);
nameValuePairs.add(new BasicNameValuePair("name", "Hi"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// 执行HTTP Post请求
httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// 处理异常
} catch (IOException e) {
// 处理异常
}
}
//****************************************
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
\n以及stack trace：\n
10-27 06:11:59.094: E/AndroidRuntime(810): FATAL EXCEPTION: main 10-27 06:11:59.094: E/AndroidRuntime(810): android.os.NetworkOnMainThreadException 10-27 06:11:59.094: E/AndroidRuntime(810): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) 10-27 06:11:59.094: E/AndroidRuntime(810): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 10-27 06:11:59.094: E/AndroidRuntime(810): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 10-27 06:11:59.094: E/AndroidRuntime(810): at java.net.InetAddress.getAllByName(InetAddress.java:214) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 10-27 06:11:59.094: E/AndroidRuntime(810): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 10-27 06:11:59.094: E/AndroidRuntime(810): at com.yahya.trackingsysem.MyService.postData(MyService.java:60) 10-27 06:11:59.094: E/AndroidRuntime(810): at com.yahya.trackingsysem.MyService$1.run(MyService.java:37) 10-27 06:11:59.094: E/AndroidRuntime(810): at android.os.Handler.handleCallback(Handler.java:730) 10-27 06:11:59.094: E/AndroidRuntime(810): at android.os.Handler.dispatchMessage(Handler.java:92) 10-27 06:11:59.094: E/AndroidRuntime(810): at android.os.Looper.loop(Looper.java:137) 10-27 06:11:59.094: E/AndroidRuntime(810): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-27 06:11:59.094: E/AndroidRuntime(810): at java.lang.reflect.Method.invokeNative(Native Method) 10-27 06:11:59.094: E/AndroidRuntime(810): at java.lang.reflect.Method.invoke(Method.java:525) 10-27 06:11:59.094: E/AndroidRuntime(810): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-27 06:11:59.094: E/AndroidRuntime(810): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-27 06:11:59.094: E/AndroidRuntime(810): at dalvik.system.NativeStart.main(Native Method) 10-27 06:12:09.094: I/Process(810): Sending signal. PID: 810 SIG: 9 10-27 06:12:24.545: D/AndroidRuntime(828): Shutting down VM 10-27 06:12:24.545: W/dalvikvm(828): threadid=1: thread exiting with uncaught exception (group=0x41465700) 10-27 06:12:24.595: E/AndroidRuntime(828): FATAL EXCEPTION: main 10-27 06:12:24.595: E/AndroidRuntime(828): android.os.NetworkOnMainThreadException 10-27 06:12:24.595: E/AndroidRuntime(828): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) 10-27 06:12:24.595: E/AndroidRuntime(828): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 10-27 06:12:24.595: E/AndroidRuntime(828): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 10-27 06:12:24.595: E/AndroidRuntime(828): at java.net.InetAddress.getAllByName(InetAddress.java:214) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 10-27 06:12:24.595: E/AndroidRuntime(828): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 10-27 06:12:24.595: E/AndroidRuntime(828): at com.yahya.trackingsysem.MyService.postData(MyService.java:60) 10-27 06:12:24.595: E/AndroidRuntime(828): at com.yahya.trackingsysem.MyService$1.run(MyService.java:37) 10-27 06:12:24.595: E/AndroidRuntime(828): at android.os.Handler.handleCallback(Handler.java:730) 10-27 06:12:24.595: E/AndroidRuntime(828): at android.os.Handler.dispatchMessage(Handler.java:92) 10-27 06:12:24.595: E/AndroidRuntime(828): at android.os.Looper.loop(Looper.java:137) 10-27 06:12:24.595: E/AndroidRuntime(828): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-27 06:12:24.595: E/AndroidRuntime(828): at java.lang.reflect.Method.invokeNative(Native Method) 10-27 06:12:24.595: E/AndroidRuntime(828): at java.lang.reflect.Method.invoke(Method.java:525) 10-27 06:12:24.595: E/AndroidRuntime(828): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-27 06:12:24.595: E/AndroidRuntime(828): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-27 06:12:24.595: E/AndroidRuntime(828): at dalvik.system.NativeStart.main(Native Method)
问题：通过服务发送数据会导致应用程序崩溃。
出现原因：在线程中不能使用任何与UI相关的内容，而在这里，在一个线程中显示Toast消息，导致应用程序崩溃。解决方法是使用Handler来显示Toast消息。
解决方法示例代码：
Runnable runnable = new Runnable() {
public void run() {
Message msg = handler.obtainMessage();
Bundle bundle = new Bundle();
bundle.putString("myKey", dateString);
msg.setData(bundle);
handler.sendMessage(msg);
}
};
private final Handler handler = new Handler() {
public void handleMessage(Message msg) {
String aResponse = msg.getData().getString("message");
Toast.makeText(getApplicationContext(), "" + msg, Toast.LENGTH_LONG).show();
}
};
将此代码添加到你的服务类中。
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
在Manifest文件中添加以下权限：
我不需要Toast消息，所以我删除了它，但问题仍然存在。嗨...在我的上述帖子中添加了两行代码，请检查一下。我希望它能起作用。
并且，请查看此链接：stackoverflow.com/questions/16439587
现在不再崩溃了，这段小代码修复了问题，虽然我不知道为什么，但感谢你，现在我可以继续查看下一步，看看为什么服务器没有接收到字符串。