Android下引用系统库(.so文件)的方法及问题.docx

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1、我们看一下如何在Android环境下引用/system/lib下的.so文件（若您也对此有所了解，还望不吝赐教后面的问题，先谢!）。为避免讲得混淆，先将我的代码的结构贴出来。首先，新建Android工程：AndroidJniTest，在AndroidJniTestActivity.java中的代码如下：[java]viewplaincopyprint?1.packagemars.com;2.importandroid.app.Activity;3.importandroid.os.Bundle;4.publicclassAndroidJniTes

2、tActivityextendsActivity{5./**Calledwhentheactivityisfirstcreated.*/6.@Override7.publicvoidonCreate(BundlesavedInstanceState){8.super.onCreate(savedInstanceState);9.setContentView(R.layout.main);1.System.loadLibrary("test");2.CallNativecallnative=newCallNative();3.byte[]cmd={

3、(byte)'u004c'};4.inta=callnative.writeCmd(cmd,"/system/lib");5.6.}7.}packagemars.com;importandroid.app.Activity;importandroid.os.Bundle;publicclassAndroidJniTestActivityextendsActivity{/**Calledwhentheactivityisfirstcreated.*/@OverridepublicvoidonCreate(BundlesavedInstanceSt

4、ate){super.onCreate(savedInstanceState);setContentView(R.layout.main);System.loadLibrary("test");CallNativecallnative=newCallNative();byte[]cmd={(byte)'u004c'};inta=callnative.writeCmd(cmd,"/system/lib");}}再在包mars.com下建立文件：CallNative.java代码：[java]viewplaincopyprint?1.package

5、mars.com;2.publicclassCallNative{3.publicnativebyte[]readCmd(Stringpath);4.publicnativeintwriteCmd(byte[]cmd,Stringpath);5.}packagemars.com;publicclassCallNative{publicnativebyte[]readCmd(Stringpath);publicnativeintwriteCmd(byte[]cmd,Stringpath);}利用javah工具创建本地库文件的头文件mars_com_

6、CallNative.h代码：[cpp]viewplaincopyprint?1./*DONOTEDITTHISFILE-itismachinegenerated*/2.#include3./*Headerforclassmars_com_CallNative*/4.#ifndef_Included_mars_com_CallNative5.#define_Included_mars_com_CallNative6.#ifdef__cplusplus7.extern"C"{8.#endif9./*10.*Class:mars_com

7、_CallNative11.*Method:readCmd1.*Signature:(Ljava/lang/String;)[B2.*/3.JNIEXPORTjbyteArrayJNICALLJava_mars_com_CallNative_readCmd4.(JNIEnv*,jobject,jstring);5./*6.*Class:mars_com_CallNative7.*Method:writeCmd8.*Signature:([BLjava/lang/String;)I9.*/10.JNIEXPORTjintJNICALLJava_ma

8、rs_com_CallNative_writeCmd11.(JNIEnv*,jobject,jbyteArray,jstring);12