java - 可打包 writeToParcel() : What's the best way to write multiple variables of the same type?

Question

我有十个字符串:str1、str2、str3...、str10(不是实际的字符串名称)。我是否必须对所有 10 个字符串执行 dest.writeString(str_n) 还是有更简单的方法来执行此操作？我如何读回它们？

示例:

@Override
public void writeToParcel(Parcel dest, int flags) {
      dest.writeString(str1);       
      dest.writeString(str2);   
      dest.writeString(str3);   
      dest.writeString(str4);   
      dest.writeString(str5);   
      dest.writeString(str6);   
      dest.writeString(str7);   
      dest.writeString(str8);   
      dest.writeString(str9);
      dest.writeString(str10);      
}

如您所见，这可能会变得非常冗长。任何建议都会有所帮助!谢谢!

Answer 1

如果您的 Parcelable 类中有 10 个字符串，并且您想要恢复它们的值，那么就可以这样做。您可以通过创建一个 Parcelable.Creator 和一个接受 Parcel 对象作为其参数的私有(private)构造函数来读回它们，然后在该构造函数中对 Parcel 调用 readString() 与调用writeString()的顺序相同。请参阅http://developer.android.com/reference/android/os/Parcelable.html

它看起来像这样:

public class MyParcelable implements Parcelable {

     private String str1;
     private String str2;
     private String str3;
     private String str4;
     private String str5;
     private String str6;
     private String str7;
     private String str8;
     private String str9;
     private String str10;

     public int describeContents() {
         return 0;
     }

     public void writeToParcel(Parcel dest, int flags) {
      dest.writeString(str1);       
      dest.writeString(str2);   
      dest.writeString(str3);   
      dest.writeString(str4);   
      dest.writeString(str5);   
      dest.writeString(str6);   
      dest.writeString(str7);   
      dest.writeString(str8);   
      dest.writeString(str9);
      dest.writeString(str10);
     }

     public static final Parcelable.Creator<MyParcelable> CREATOR
             = new Parcelable.Creator<MyParcelable>() {
         public MyParcelable createFromParcel(Parcel in) {
             return new MyParcelable(in);
         }

         public MyParcelable[] newArray(int size) {
             return new MyParcelable[size];
         }
     };

     private MyParcelable(Parcel in) {
         str1 = in.readString();       
         str2 = in.readString();       
         str3 = in.readString();       
         str4 = in.readString();       
         str5 = in.readString();       
         str6 = in.readString();       
         str7 = in.readString();       
         str8 = in.readString();       
         str9 = in.readString();       
         str10 = in.readString();       
     }
 }