Parcel了解

了解Parcel类的作用

* Container for a message (data and object references) that can * be sent through an IBinder.  A Parcel can contain both flattened data * that will be unflattened on the other side of the IPC (using the various * methods here for writing specific types, or the general * {@link Parcelable} interface), and references to live {@link IBinder} * objects that will result in the other side receiving a proxy IBinder * connected with the original IBinder in the Parcel.

大概意思，Parcel就是一个存放读取数据的容器， Android系统中的binder进程间通信(IPC)就使用了Parcel类来进行客户端与服务端数据的交互。

产生一个Parcel对象

public static Parcel obtain() {        final Parcel[] pool = sOwnedPool;        synchronized (pool) {            Parcel p;            for (int i=0; i<POOL_SIZE; i++) {                p = pool[i];                if (p != null) {                    pool[i] = null;                    if (DEBUG_RECYCLE) {                        p.mStack = new RuntimeException();                    }                    return p;                }            }        }        return new Parcel(0);    }