首页 / 操作系统 / Linux / Android Intent 使用 Parcel 反序列化出错
Android Parcel 可以序列化反序列化数据 .但上层的(Intent)却反序列化失败.结论:查看Android源代码, Intent 的Parcel 接口代码,也未能找出问题所在.如下是我的测试代码 :非持久化测试代码: final Intent intent = new Intent("cn.eben.bookshelf.VIEW");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//序列化前 Intent 内存
Intent { act=cn.eben.bookshelf.VIEW flg=0x10000000 }
Parcel parcel = Parcel.obtain();
intent.writeToParcel(parcel, 0);
byte[] data = parcel.marshall();
Parcel readParcel = Parcel.obtain();
readParcel.unmarshall(data, 0, data.length);
Intent readIntent = Intent.CREATOR.createFromParcel(readParcel); // readIntent 内存状态, Intent 反序列化失败.
Intent { (has extras) }
null
null
null
null
null
Bundle[mParcelledData.dataSize=0]
0
null
null
null
null context.startActivity(readIntent);// Activite 无法启动, Intent 无效// 持久化测试代码 与内存状态调试中,查看内存状态: final Intent intent = new Intent("cn.eben.bookshelf.VIEW");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);查看内存:序列化前 Intent 内存
Intent { act=cn.eben.bookshelf.VIEW flg=0x10000000 }
Parcel parcel = Parcel.obtain();
intent.writeToParcel(parcel, 0);
byte[] data = parcel.marshall();// 查看Data内存如下:[22, 0, 0, 0, 99, 0, 110, 0, 46, 0, 101, 0, 98, 0, 101, 0, 110, 0, 46, 0, 98, 0, 111, 0, 111, 0, 107, 0, 115, 0, 104, 0, 101, 0, 108, 0, 102, 0, 46, 0, 86, 0, 73, 0, 69, 0, 87, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, 0, 0, 0, 16, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1]
cv.put("intent", data); //将parcel对持久化.///读取 byte[] data = cursor.getBlob(cursor.getColumnIndex("intent"));//查看读取到的 Data内存如下: 与写入的相同.
[22, 0, 0, 0, 99, 0, 110, 0, 46, 0, 101, 0, 98, 0, 101, 0, 110, 0, 46, 0, 98, 0, 111, 0, 111, 0, 107, 0, 115, 0, 104, 0, 101, 0, 108, 0, 102, 0, 46, 0, 86, 0, 73, 0, 69, 0, 87, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, 0, 0, 0, 16, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1]
if (null != data && 1 < data.length) {
Intent intent = null;
Parcel parcel = Parcel.obtain();// 进行反序列化:
parcel.unmarshall(data, 0, data.length);
intent = Intent.CREATOR.createFromParcel(parcel);
// intent 内存状态, Intent 反序列化失败.
Intent { (has extras) }
null
null
null
null
null
Bundle[mParcelledData.dataSize=0]
0
null
null
null
null
}查看Android Intnet 源代码: 看不出来有什么异常更多Android相关信息见Android 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=11