{"id":4890,"date":"2023-07-25T22:58:53","date_gmt":"2023-07-25T14:58:53","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=4890"},"modified":"2023-10-17T10:19:18","modified_gmt":"2023-10-17T02:19:18","slug":"android-aidl-usage-of-parcelable-variable","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android-aidl-usage-of-parcelable-variable.html","title":{"rendered":"Android AIDL\u4f7f\u7528\u4e4bParcelable\u5bf9\u8c61"},"content":{"rendered":"
\n
\n \t<\/i> Read Time:<\/span>2 Minute, 12 Second <\/div>\n\n <\/div>\n

parcel\u662f\u5b89\u5353binder\u901a\u4fe1\u4e2d\u7684\u6d88\u606f\u8f7d\u4f53\uff0c\u901a\u8fc7IBinder\u8fdb\u884c\u4f20\u9012\u3002Parcel\u7684\u6e90\u7801\u5b9e\u73b0\u4e3aandroid.os.Parcel\uff0c\u7ee7\u627f\u81eajava.lang.object\u3002\u6d89\u53ca\u7684\u76f8\u5173\u6e90\u7801\u4e3a\uff1a<\/p>\n\n\n\n

base\/core\/java\/android\/os\/Parcel.java  \/\/java \u5b9e\u73b0\nframeworks\/base\/core\/jni\/android_os_Parcel.cpp \/\/JNI\u5b9e\u73b0\nframeworks\/native\/libs\/binder\/Parcel.cpp \/\/ C++\u5b9e\u73b0\nframeworks\/native\/libs\/binder\/include\/binder\/Parcelable.h  \/\/c++ \u5934\u6587\u4ef6<\/code><\/pre>\n\n\n\n
\u6709\u4e9b\u65f6\u5019\u6211\u4eec\u9700\u8981\u5728binder\u4e2d\u4f20\u9012\u81ea\u5b9a\u4e49\u7684\u6570\u636e\u7c7b\u578b\u6216\u8005\u7c7b\uff0c\u6b64\u65f6\u9700\u8981\u4f7f\u8be5\u7c7b\u5b9e\u73b0Parcelable\u63a5\u53e3\uff0c\u5982\u679c\u6211\u4eec\u662f\u5728C++\u7a0b\u5e8f\u4e0eJava\u7a0b\u5e8f\u4e2d\u8fdb\u884c\u4f20\u9012\uff0c\u90a3\u4e48C++\u4e0eJava\u4fa7\u90fd\u9700\u8981\u5b9e\u73b0Parcelable\u63a5\u53e3\u3002\u652f\u6301Parcelbale\u63a5\u53e3\u5341\u5206\u91cd\u8981\uff0cAndroid\u7cfb\u7edf\u53ef\u901a\u8fc7\u8be5\u63a5\u53e3\u5c06\u5bf9\u8c61\u5206\u89e3\u6210\u5404\u8fdb\u7a0b\u652f\u6301\u7684\u539f\u751f\u7c7b\u578b\u3002\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cParcel\u662f\u5b9e\u4f53\u7c7b\uff0c\u800cParcelable\u662f\u63a5\u53e3\u3002<\/p>\n\n\n\n
\u81ea\u5df1\u5b9e\u73b0Parcelable\u63a5\u53e3\uff0c\u6839\u636e\u540e\u7aef\u8bed\u8a00\u7684\u4e0d\u540c\uff0c\u5177\u4f53\u5b9e\u73b0\u4e0a\u4e5f\u5b58\u5728\u5dee\u5f02\u3002\u8fd9\u91cc\u5c06\u5206\u522b\u4ee5Java\u548cC++\u4e24\u79cd\u540e\u7aef\u8bed\u8a00\u7ed9\u51fa\u793a\u4f8b\u3002<\/p>\n\n\n\n
Java<\/h5>\n\n\n\n
1.\u5b9a\u4e49aidl\u6587\u4ef6,\u5982myParcelable.aidl\uff0c\u8fd9\u91cc\u5176\u5b9e\u6709\u7ea6\u5b9a\u4fd7\u6210\u7684\u547d\u540d\u65b9\u5f0f\uff0c\u4e0d\u9700\u8981\u50cf\u5b9a\u4e49\u63a5\u53e3\u90a3\u6837\u4ee5I\u5f00\u5934\uff0c\u5e76\u4e14\u5176\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n
package android.com.example;\nparcelable myParcelable;<\/code><\/pre>\n\n\n\n
2.\u5b9e\u73b0Parcelable\u63a5\u53e3\u4e2d\u7684int describeContents()\u3001void writeToParcel(Parcel dest,int flags)\u4ee5\u53ca\u4e3amyParcelable\u7c7b\u6dfb\u52a0CREATOR\u9759\u6001\u5b57\u6bb5\uff0c\u5b9e\u73b0Parcelable.Creator\u63a5\u53e3\u7684\u5bf9\u8c61\uff0c\u8fd9\u91cc\u7ed9\u51fa\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
import android.os.Parcel;\nimport android.os.Parcelable;\n\npublic final class myParcelable implements Parcelable {\n    public int left;\n    public int top;\n    public int right;\n    public int bottom;\n    \/\/\u5b9e\u73b0Parcelable.Creator\u7684\u63a5\u53e3\n    public static final Parcelable.Creator<myParcelable> CREATOR = new \n    Parcelable.Creator<myParcelable>() {\n        public myParcelable createFromParcel(Parcel in) {\n            return new myParcelable(in);\n        }\n\n        public myParcelable[] newArray(int size) {\n            return new myParcelable[size];\n        }\n    };\n\n    public myParcelable() {\n    }\n\n    private myParcelable(Parcel in) {\n        readFromParcel(in);\n}\n\n    public void readFromParcel(Parcel in) {\n        left = in.readInt();\n        top = in.readInt();\n        right = in.readInt();\n        bottom = in.readInt();\n    }\n   \/\/\u5b9e\u73b0Parcelable\u63a5\u53e3 \n    public void writeToParcel(Parcel out, int flags) {\n        out.writeInt(left);\n        out.writeInt(top);\n        out.writeInt(right);\n        out.writeInt(bottom);\n    }\n    public int describeContents() {\n        return 0;\n}<\/code><\/pre>\n\n\n\n
\u5728\u4f7f\u7528\u65f6\u5bfc\u5165\u76f8\u5e94\u7684Parcelable\u7c7b\u5373\u53ef\u3002<\/p>\n\n\n\n
C++<\/h5>\n\n\n\n
\u4f7f\u7528C++\u6765\u5b9e\u73b0Parcelable\u7c7b\u76f8\u6bd4\u4e8eJava\u5b9e\u73b0\u8981\u590d\u6742\u8bb8\u591a\uff0c\u5927\u81f4\u5305\u542b\u5982\u4e0b\u51e0\u4e2a\u6b65\u9aa4\u3002<\/p>\n\n\n\n
1.\u5b9a\u4e49aidl\u6587\u4ef6,\u5982myParcelable.aidl\uff0c\u5176\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n
package android.com.example;\nparcelable myParcelable cpp_header \u201cmyParcelable.h\u201d;<\/code><\/pre>\n\n\n\n
2.\u6dfb\u52a0\u5bf9\u5e94\u7684\u5934\u6587\u4ef6\u4e0e\u6e90\u7801\u6587\u4ef6\uff0c\u5982myParcelable.h\u4e0emyParcelable.cpp\uff0c\u5728\u5934\u6587\u4ef6\u4e2d\u58f0\u660e\u7c7bmyParcelable\u5e76\u4f7f\u5176\u7ee7\u627fandroid::Parcelable\uff0c\u8986\u5199virtual status_t writeToParcel(Parcel* parcel)\u4e0evirtual status_t readFromParcel(const Parcel* parcel)\uff0c\u5e76\u6839\u636e\u81ea\u8eab\u9700\u8981\u5b9e\u73b0\u5176\u4ed6\u7684\u65b9\u6cd5\u5373\u53ef\uff0c\u8fd9\u91cc\u7ed9\u51fa\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n\n\n\n
myParcelable.h\u5934\u6587\u4ef6\uff1a<\/p>\n\n\n\n
\/\/myParcelable.h\n#ifndef __MY_PARCELABLE_H__\n#define __MY_PARCELABLE_H__\n\n#include <vector>\n#include <utils\/Errors.h>\n#include <utils\/String8.h>\n#include <utils\/String16.h>\n#include <binder\/Parcelable.h>\n#include <binder\/Parcel.h>\n\n\nusing namespace std;\nusing android::Parcel;\nusing android::Parcelable;\nusing android::String16;\nusing android::String8;\n\n\nclass myPaecelable : public Parcelable\n{\npublic:\n  myPaecelable ();\n  myPaecelable (int32_t messageId);\n  ~myPaecelable ();\n  virtual status_t writeToParcel(Parcel *parcel) const override;\n  virtual status_t readFromParcel(const Parcel *parcel) override;\n  void setMessageId(const int32_t messageId);\n\npublic:\n  int32_t messageId;\n};\n#endif<\/code><\/pre>\n\n\n\n
 myParcelable.cpp\u6e90\u6587\u4ef6<\/p>\n\n\n\n
include \"myParcelable.h\"\n\nmyPaecelable ::myPaecelable () : messageId(0)\n{\n}\n\nmyPaecelable ::~myPaecelable ()\n{\n}\n\nmyPaecelable ::myPaecelable (int32_t messageId) : messageId(messageId)\n{\n}\n\nstatus_t myPaecelable ::writeToParcel(Parcel *parcel) const\n{\n    if (parcel == nullptr)\n    {\n        LOGE(\"[myPaecelable ] parcel == nullptr\");\n        return BAD_VALUE;\n    }\n    status_t res = OK;\n    res = parcel->writeInt32(messageId);\n    if (res != OK)\n    {\n        LOGE(\"[myPaecelable ] writeInt32 failed, ret:[%d]\", res);\n        return res;\n    }\n    return OK;\n}\n\nstatus_t myPaecelable ::readFromParcel(const Parcel *parcel)\n{\n    if (parcel == nullptr)\n    {\n        LOGE(\"[myPaecelable] parcel == nullptr\");\n        return BAD_VALUE;\n    }\n    status_t res = OK;\n    res = parcel->readInt32(&messageId);\n    if (res != OK)\n    {\n        LOGE(\"[myPaecelable] readInt32 failed, ret:[%d]\", res);\n        return res;\n    }\n    return OK;\n}\n\nvoid myPaecelable ::setMessageId(const int32_t messageId)\n{\n    this->messageId = messageId;\n}<\/code><\/pre>\n\n\n\n
\u5728\u4f7f\u7528\u65f6\u5bfc\u5165\u76f8\u5e94\u7684\u5934\u6587\u4ef6\u5373\u53ef\u3002<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    1<\/span>\n                        \n                                                100<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
\u5b89\u5353AIDL\u901a\u4fe1\u4e2d\u81ea\u5b9a\u4e49Parcelable\u5bf9\u8c61\u4f7f\u7528<\/p>","protected":false},"author":1,"featured_media":4483,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":1,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[18],"tags":[71,46],"class_list":["post-4890","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-system","tag-aidl","tag-android"],"blocksy_meta":[],"aioseo_notices":[],"featured_image_urls":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-150x150.jpg",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-300x158.jpg",300,158,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-18x9.jpg",18,9,true]},"post_excerpt_stackable":"
\u5b89\u5353AIDL\u901a\u4fe1\u4e2d\u81ea\u5b9a\u4e49Parcelable\u5bf9\u8c61\u4f7f\u7528<\/p>\n","category_list":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num":"0 comments","featured_image_urls_v2":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-150x150.jpg",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-300x158.jpg",300,158,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-18x9.jpg",18,9,true]},"post_excerpt_stackable_v2":"
\u5b89\u5353AIDL\u901a\u4fe1\u4e2d\u81ea\u5b9a\u4e49Parcelable\u5bf9\u8c61\u4f7f\u7528<\/p>\n","category_list_v2":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info_v2":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num_v2":"0 comments","_links":{"self":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/4890","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/comments?post=4890"}],"version-history":[{"count":7,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/4890\/revisions"}],"predecessor-version":[{"id":4998,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/4890\/revisions\/4998"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media\/4483"}],"wp:attachment":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media?parent=4890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/categories?post=4890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/tags?post=4890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}