绑定服务与iBinder本地服务连续字符串更新

Question

在this example（扩展Binder类部分）之后，可以在Activity中获取一个来自Service的字符串，只需按一个按钮。

但是如何在Activity中连续获取字符串更新？为了更好地解释，如果服务数据在ramdomly中变化，如何在Activity中获取相同的数据（字符串），而不按任何键？因为似乎获得的值是请求值服务的时间......

剪切活动

public void onButtonClick(View v) {
    if (mBound) {
        // Call a method from the LocalService.
        // However, if this call were something that might hang, then this request should
        // occur in a separate thread to avoid slowing down the activity performance.
        int num = mService.getRandomNumber();
        Toast.makeText(this, "number: " + num, Toast.LENGTH_SHORT).show();
    }
}

服务片段

/** method for clients */
public int getRandomNumber() {
  return mGenerator.nextInt(100);
}