Android 4.0网络通信编程错误分析 NetworkOnMainThreadException_android线程与网络通信编程时发现的问题

作者：盐析白兔 | 2024-04-21 21:31:23

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android线程与网络通信编程时发现的问题

在Android4.0调试NTP的APK时遇到如下错误：

D/SntpClient( 1650): request time failed: android.os.NetworkOnMainThreadException
D/SntpClient( 1650): request time failed: android.os.NetworkOnMainThreadException
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后分析发现：

Android4.0中系统服务不能直接调用网络通信接口，需要启动一个线程负责网络通信

启动方法：

public void SyncTime(){

Runnable syncTimeRunner = new Runnable() {

@Override

public void run() {

SyncTimeLock();

}

};

/* 启动线程负责网络通信 */

new Thread(syncTimeRunner).start();

}

protected void SyncTimeLock(){

SntpClient client = new SntpClient();

for (int i = 0; i< setNtpServers.length; i++){

boolean flag = client.requestTime(setNtpServers[i], NTP_TIMEOUT);

Log.i(TAG, flag + " = client.requestTime(server:" + setNtpServers[i]+", timeout:"+NTP_TIMEOUT+")");

if(flag){

long now = client.getNtpTime() +SystemClock.elapsedRealtime()-client.getNtpTimeReference();

SystemClock.setCurrentTimeMillis(now);

Message msg = new Message();

msg.what = 1;

handeler.sendMessage(msg);

break;

}else if(i == setNtpServers.length-1){

Message msg = new Message();

msg.what = 0;

handeler.sendMessage(msg);

}

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