java.lang.RuntimeException: Unable to start activity ComponentInfo{com.autumn.book/com.autumn.book.MainActivity}: android.os.NetworkOnMainThreadException
不能把http请求写在主线程里，改为这样
Runnable runnable = new Runnable() {
public void run() {
HttpClient.post2("Notification posted 通知标题: " + "通知内容:");
}
};
new Thread(runnable).start();
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