java lib shared

Android_app.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional

LOCAL_SRC_FILES := $(call all-java-files-under, src)

LOCAL_SDK_VERSION := current

LOCAL_JAVA_LIBRARIES := hellolib
LOCAL_PACKAGE_NAME := HelloTTT

include $(BUILD_PACKAGE)

Android_lib.mk

# Copyright 2008 The Android Open Source Project
#
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_SRC_FILES := $(call all-subdir-java-files)
LOCAL_MODULE := hellolib

LOCAL_MODULE_CLASS := JAVA_LIBRARIES
LOCAL_MODULE_PATH := $(TARGET_OUT_JAVA_LIBRARIES)
include $(BUILD_JAVA_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := hellolib.xml
LOCAL_MODULE_CLASS := ETC
LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/permissions
LOCAL_SRC_FILES := $(LOCAL_MODULE)
include $(BUILD_PREBUILT)

AndroidManifest_app.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
This software is in the public domain, furnished "as is", without technical
support, and with no warranty, express or implied, as to its usefulness for
any purpose.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.igdium.helloworld2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".HelloWorldAndroidActivity"
            android:label="@string/app_name" >
            <uses-library android:name="com.jpzhu.hellolib" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <uses-library android:name="com.jpzhu.hellolib" />

    </application>

</manifest>

hellolib.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
          http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<permissions>
    <library name="com.jpzhu.hellolib"
            file="/system/framework/hellolib.jar" />
</permissions>

jivalib.md

1. 编译javalib时需要指明编译类型为BUILD_JAVA_LIBRARY。 所以在Android.mk中需要include $(BUILD_JAVA_LIBRARY)

2. 生成一个javalib的共享库时，需要提供一个permission文件放到 /system/etc/permissions 目录下，用于其它使用该库的app能够查询到该共享.jar文件。内容参考hellolib.xml.

3. 编译javaapp的，需要在AndroidManifest.xml里指明使用了该java库。 其中android:name需要指明的名字是javalib里的package名。

4. java app的Android.mk里需要指明应用了哪个库名。 LOCAL_JAVA_LIBRARIES := hellolib

当permission文件被拷贝至设备时，需重启方能生效

参考: http://hi.baidu.com/gaogaf/item/cef2285e2372bb444fff2046