Android JNI编程

创建工程:结构如下

代码如下：

package com.tcl.testjni;public class MyJNI {public native void fun();}

package com.tcl.testjni;import android.R.integer;import android.app.Activity;import android.os.Bundle;import android.text.StaticLayout;public class TestJNIActivity extends Activity {static{System.loadLibrary("kang");}    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);       MyJNI jni = new MyJNI();       jni.fun();            }}

这样在工程的bin目录下就生成了.class文件，这时切换到src目录，用javah生成头文件:

根据头文件创建.c文件

/* DO NOT EDIT THIS FILE - it is machine generated */#include "com_tcl_testjni_MyJNI.h"JNIEXPORT void JNICALL Java_com_tcl_testjni_MyJNI_fun  (JNIEnv *, jobject){printf("%s","here is jni");}

创建 Android.mk文件

## 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.# LOCAL_PATH:= $(call my-dir)    include $(CLEAR_VARS)    LOCAL_SRC_FILES:= \   com_tcl_testjni_MyJNI.c   LOCAL_C_INCLUDES := \    $(JNI_H_INCLUDE)    LOCAL_SHARED_LIBRARIES := libutils    LOCAL_PRELINK_MODULE := false    LOCAL_MODULE := libkang   include $(BUILD_SHARED_LIBRARY)

将.h .c Android.mk文件放入一个文件夹，复制到Android源码 2.2source/external/XXX，然后编译下这个文件夹就会生成so库啦，将so放到工程的libs/armeabi下，再运行试试，可以了吧。

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