如何在Android框架[AOSP] Java文件中使用外部jar(如jsoup库)(不是Android Studio或Java IDE) [英] How to use external jar like jsoup library in android framework [AOSP] java files (NOT Android Studio or Java IDE)

问题描述

我希望在Android开放源代码项目中使用jsoup库. 为此，我做了两件事:-

I wish to use jsoup library in Android Open Source Project. For this I did two things:-

第1步:

1. 按以下方式共同创建目录jsoup:[android]prebuilts/misc/common/jsoup/
2. 在此jsoup文件夹中，我添加了从以下位置下载的jsoup-1.13.1.jar: https://jsoup.org/download
3. 在同一jsoup文件夹中，我添加了另一个文件Android.mk {因为它是下面的名称和代码:}

1. Made a directory jsoup in common as follows: [android]prebuilts/misc/common/jsoup/
2. In this jsoup folder I added jsoup-1.13.1.jar downloaded from : https://jsoup.org/download
3. In this same jsoup folder I added another file Android.mk {as it is name and code below:}

    LOCAL_PATH := $(call my-dir)  
    include $(CLEAR_VARS)  
    LOCAL_MODULE := jsoup
    LOCAL_MODULE_TAGS := optional
    LOCAL_SRC_FILES := jsoup-1.13.1.jar
    LOCAL_MODULE_CLASS := JAVA_LIBRARIES
    LOCAL_MODULE_SUFFIX := $(COMMON_JAVA_PACKAGE_SUFFIX)
    LOCAL_DEX_PREOPT := false
    include $(BUILD_PREBUILT)

第2步:

1. 按如下所示转到另一个制作文件:[android]/frameworks/base/Android.mk
2. 在这个Android.mk文件中，我添加了以下代码(在设置LOCAL_JAVA_LIBRARIES变量之后): LOCAL_STATIC_JAVA_LIBRARIES + = jsoup

1. Go to another make file as follows : [android]/frameworks/base/Android.mk
2. In this Android.mk file I added following line shown below (after the LOCAL_JAVA_LIBRARIES variable is set): LOCAL_STATIC_JAVA_LIBRARIES += jsoup

问题:

1. 我添加了一个文件sample.java，如下所示: [android] frameworks/base/services/core/java/com/android/server/am/sample.java
2. 在这个sample.java文件中，我具有如下的import语句-

1. I have added a file sample.java as follows- [android]frameworks/base/services/core/java/com/android/server/am/sample.java
2. In this sample.java file I have import statements as follows-

    import org.jsoup.Jsoup;
    import org.jsoup.nodes.Document;
    import org.jsoup.select.Elements;

1. 构建整个修改后的android代码时，出现以下错误，构建失败:

frameworks/base/services/core/java/com/android/server/am/sample.java:48: error: package org.jsoup does not exist  
frameworks/base/services/core/java/com/android/server/am/sample.java:49: error: package org.jsoup.nodes does not exist  
frameworks/base/services/core/java/com/android/server/am/sample.java:50: error: package org.jsoup.select does not exist

1. 我什至尝试使用提及Android.bp的方法代替Android.mk，但存在相同的构建错误.
2. 我也对jar文件的命名感到困惑，因为import语句包含org.jsoup ...但是jar文件本身只是jsoup. (我是否必须将import语句更改为import jsoup ...或将jar文件的名称更改为org.jsoup ...)
3. 除涉及Android.mk或Android.bp之外的任何其他方法也是可以接受的.

请，我不知道在AOSP中包含外部jar文件.否则，该代码在IntelliJ IDE Java中可以在本地正常运行.任何帮助深表感谢.预先感谢.

推荐答案

您可以将解决方案基于AOSP中已经添加的其他jar. 例如，请参见 ZXING 库在external/zxing/中的Android.bp:

You can base your solution on some other jar already added in AOSP.
For example see ZXING library's Android.bp in external/zxing/:

java_import {
    name: "zxing-core-1.7",
    host_supported: true,
    installable: false,
    jars: ["core.jar"],
}

然后在另一个最后，根据要添加的文件的路径，将库添加到错误的makefile.

Lastly, based on the path of the file you're adding frameworks/base/services/core/java/com/android/server/am/sample.java, you're adding the library to the wrong makefile.

您更改的(frameworks/base/Android.mk)是用于制作framework.jar的，而您试图在services.jar上添加一个类

The one you changed (frameworks/base/Android.mk) is for making framework.jar, whereas you're trying to add a class on services.jar

要修改的正确makefile为:frameworks/base/services/core/Android.bp

The correct makefile to modify would be: frameworks/base/services/core/Android.bp

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