android.os.NetworkOnMainThreadException 解决办法:

产生的原因:

在4.0之后在主线程里面执行Http请求都会报这个错，也许是怕Http请求时间太长造成程序假死的情况

解决办法:

1.在发起Http请求的Activity里面的onCreate函数里面添加如下代码

StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());

2.使用Thread、Runnable、Handler这三个类

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.share_mblog_view);
new Thread(runnable).start();
}

Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Bundle data = msg.getData();
String val = data.getString("value");
Log.i("mylog","请求结果为-->" + val);
}
}

Runnable runnable = new Runnable(){
@Override
public void run() {
Message msg = new Message();
Bundle data = new Bundle();
data.putString("value","请求结果");
msg.setData(data);
handler.sendMessage(msg);
}
}