Android Message 内存泄漏问题

在Android 4.1以上SDK中Message类的回收修复之前的内存泄漏bug

在Android 4.4版本的Message类回收函数实现如下：

  /**
     * Return a Message instance to the global pool.  You MUST NOT touch
     * the Message after calling this function -- it has effectively been
     * freed.
     */
    public void recycle() {
        clearForRecycle();

        synchronized (sPoolSync) {
            if (sPoolSize < MAX_POOL_SIZE) {
                next = sPool;
                sPool = this;
            &n