在新线程中运行函数，函数运行完毕后再执行进一步动作：
private final Handler handler = new Handler() {
@Override
public void handleMessage(Message message) {
// Code Here to do something after the following thread
String str = (String)message.obj; //获得传递过来的对象
}
};
// 在想要开启线程处：
Runnable runnable = new Runnable() {
public void run() {
// Code Here
//Notify UI thread afterwards using Handler
Message msg = handler.obtainMessage(); //或者：Message msg = handler.obtainMessage(1, obj); //obj 是要传递的参数
handler.sendMessage(msg);
}
};
new Thread(runnable).start();