lib(libjnidispatch.so),現在支持的平臺有win32 x86/amd64/mac, linux x86/bsd, sun os
等等,java層應該是通用,無需做改動。所以文章就做在怎樣得到android平臺辨認的native .so 上。
2) 確定思路,搭建jna/native arm交叉編譯環境,得到android自己的jna.jar.
3) 源碼下載,開源項目非常方便
$ svn co mendations for JNI compilation
COPT=-O2
-fno-omit-frame-pointer -fno-strict-aliasing
@@ -126,10 +126,12
@@
endif
ifeq ($(OS),linux)
-ARCH=$(shell uname -m | sed
's/i.86/i386/g')
+ARCH=arm #$(shell uname -m | sed
's/i.86/i386/g')
PCFLAGS+=-fPIC
CDEFINES+=-DHAVE_PROTECTION
LDFLAGS+=-Wl,-soname,$@
+FFI_CONFIG
+=
--host=arm-none-linux-gnueabi
+CINCLUDES+=-I/usr/include
endif
ifeq
($(OS),freebsd)
Index:
build.xml
===================================================================
---
build.xml (revision 1146)
+++ build.xml (working copy)
@@ -92,6
+92,7 @@
<os arch="ppc64"/>
<os
arch="sparcv9"/>
<os arch="amd64"/>
+ <os
arch="arm"/>
</or>
</condition>
<condition property="ld.preload" value="LD_PRELOAD_64"
else="LD_PRELOAD">
@@ -110,6 +111,9 @@
<condition
property="jre.arch" value="i386">
<equals arg1="x86"
arg2="${os.arch}"/>
</condition>
+ <condition
property="jre.arch" value="arm">
+ <equals arg1="arm"
arg2="${os.arch}"/>
+ </condition>
<condition
property="jre.arch" value="amd64">
<equals arg1="x86_64"
arg2="${os.arch}"/>
</condition>
@@ -285,6 +289,7 @@
<copy file="${dist}/out-of-date.jar" tofile="${dist}/win32-x86.jar"
overwrite="true"/>
<copy file="${dist}/out-of-date.jar"
tofile="${dist}/win32-amd64.jar" overwrite="true"/>
<copy
file="${dist}/out-of-date.jar" tofile="${dist}/linux-i386.jar"
overwrite="true"/>
+ <copy file="${dist}/out-of-date.jar"
tofile="${dist}/android.jar" overwrite="true"/>
<copy
file="${dist}/out-of-date.jar" tofile="${dist}/linux-amd64.jar"
overwrite="true"/>
<copy file="${dist}/out-of-date.jar"
tofile="${dist}/linux-ia64.jar" overwrite="true"/>
<copy
file="${dist}/out-of-date.jar" tofile="${dist}/freebsd-i386.jar"
overwrite="true"/>
@@ -598,6 +603,9 @@
<zipfileset
src="${dist}/linux-i386.jar"
includes="*jnidispatch*"
prefix="com/sun/jna/linux-i386"/>
+ <zipfileset
src="${dist}/arm-none-linux.jar"
+
includes="*jnidispatch*"
+
prefix="com/sun/jna/android"/>
<zipfileset
src="${dist}/linux-amd64.jar"
includes="*jnidispatch*"
prefix="com/sun/jna/linux-amd64"/>
8) 編譯
$ ant -Djre.arch=arm -Dos.arch=arm -Dos.prefix=linux-arm
9)編譯完成,妳就可以在build下等到arm編譯器編出來的jna.jar了, 如果妳用eclipse,就可以直接Project...->add
Jar 使用它了。有可能(還不確定), android不支持在jar包中加本地native .so 的做法,妳可以將jna.jar分拆開將java
class還以Jar的方式加載,而把linux-arm/下的libjnidispatch.so以add Lib..的方法加入,妳可以嘗試壹下。
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