如何在Android中正确使用Parcelable类

概述我有一个要通过意图发送到服务类的类(下).我已经实现了Parcelable接口,但是不确定如何实际发送和检索包括对象当前状态在内的整个对象.尤其是@OverridepublicvoidwriteToParcel(Parceldest,intflags){//Ineedthistosendtheentirestateoftheobject}

我有一个要通过意图发送到服务类的类(下).我已经实现了Parcelable接口,但是不确定如何实际发送和检索包括对象当前状态在内的整个对象.

尤其是

@OverrIDe public voID writetoParcel(Parcel dest, int flags) {      //I need this to send the entire state of the object}

和

public UrlParamsHelper(Parcel in) {    //I need this to unpack the state of the object}

这是实际的课程

/*  * A holder class for URL parameters  */ public static class UrlParamsHelper implements Parcelable {  private final httpClIEnt httpClIEnt;  private final httpParams params = new BasichttpParams();  private final SchemeRegistry registry = new SchemeRegistry();  private final ThreadSafeClIEntConnManager manager;  private final Uri.Builder uri = new Uri.Builder();  final httpHost host;  final String urlPath;  final String hostname;  /*   * @param hostname the hostname IE. http://www.Google.com   * @param urlPath the path to the file of interest IE. /getfiles.PHP   */  public  UrlParamsHelper(final String hostname, final String urlPath) {   httpProtocolParams.setVersion(params, httpVersion.http_1_1);   httpProtocolParams.setContentCharset(params, "UTF-8");   registry.register(new Scheme("http",PlainSocketFactory.getSocketFactory(), 80));   manager = new ThreadSafeClIEntConnManager(params, registry);   httpClIEnt = new DefaulthttpClIEnt(manager, params);   host = new httpHost(hostname, 80, "http");   uri.path(urlPath);   this.urlPath = urlPath;   this.hostname = hostname;  }  public UrlParamsHelper(Parcel in) {   //unpack the state  }  public voID addqueryString(String key, String value) {   uri.appendqueryParameter(key, value);  }  public httpGet buildGetquery() {   return new httpGet(uri.build().toString());  }  public httpClIEnt gethttpClIEnt() {   return httpClIEnt;  }  public httpHost gethttpHost() {   return host;  }   @OverrIDe  public int describeContents() {   return 0;  }  @OverrIDe  public voID writetoParcel(Parcel dest, int flags) {   //Parcel the entire state of the object  }  //Constructs the parcel again - required      public static final Parcelable.Creator<UrlParamsHelper> CREATOR = new Parcelable.Creator<UrlParamsHelper>() {       public UrlParamsHelper createFromParcel(Parcel in) {           return new UrlParamsHelper(in);       }       public UrlParamsHelper[] newArray(int size) {        throw new UnsupportedOperationException();           //return new UrlParamsHelper[size];       }   }; }

解决方法:

在您的writetoParcel函数中,您需要将想要的状态对象写入包裹,例如：

@OverrIDepublic voID writetoParcel(Parcel dest, int flags) {    dest.writeString(urlPath);    dest.writeString(hostname);}

只要以相同的顺序读回对象,则按什么顺序写对象都没关系：

@OverrIDepublic UrlParamsHelper(Parcel in) {    urlPath = in.readString();    hostname = in.readString();}

问题是您只能读写文档中提到的Parcel的对象类型,因此可能很难保存所有内容.

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