Jni开发步骤：
环境说明：
OS: Window xp sp3
Tools:eclipse juno(下载后，解压到指定路径即可)
Toolchain:cygwin(安装略，配置环境变量$NDK)
JDK: JDK 1.6.0_34(安装略，配置环境变量)
NDK: android-ndk-r8b
SDK:Android 2.3.3
新建android工程
工程名：FishEye
package：com.baony.fisheys
创建接口类
package com.baony.fisheys;
publicclass NativeFishEye {
publicnativeint openFile();
publicnativeint openImage(int image_type);
static{
System.loadLibrary("fisheye");
}
}
生成.h头文件
在项目目录创建jni文件夹，从cmd进入项目目录，输入
E:\android\workspace\FishEye>javah -classpath bin/classes -d jni com.baony.fisheys.NativeFishEye
E:\android\workspace\FishEye>
生成头文件，位于项目目录下的jni文件夹
E:\android\workspace\FishEye>cd jni
E:\android\workspace\FishEye\jni>dir
驱动器 E中的卷没有标签。
卷的序列号是 0009-B506
E:\android\workspace\FishEye\jni 的目录
2012-11-16 16:25 <DIR> .
2012-11-16 16:25 <DIR> ..
2012-11-16 16:15 768 Android.mk
2012-06-24 02:43 748 Android.mk.bak
2012-11-16 16:25 342 com_baony_fisheys_NativeFishEye.c
2012-11-16 16:23 309 com_baony_fisheys_NativeFishEye.c.bak
2012-11-16 16:41 713 com_baony_fisheys_NativeFishEye.h
5 个文件 2,880 字节
2 个目录 303,776,391,168可用字节
E:\android\workspace\FishEye\jni>
根据生成的.h文件，创建.c文件
#include <jni.h>
JNIEXPORT jint JNICALL Java_com_baony_fisheys_NativeFishEye_openFile
(JNIEnv *env, jobject thiz)
{
jint retval=0xFEFD;
return retval;
}
JNIEXPORT jint JNICALL Java_com_baony_fisheys_NativeFishEye_openImage
(JNIEnv *env, jobject thiz, jint image_type)
{
jint retval=0xFEFB;
return retval;
}
编写Android.mk
# Copyright (C) 2009 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_MODULE := fisheye
LOCAL_SRC_FILES := com_baony_fisheys_NativeFishEye.c
include $(BUILD_SHARED_LIBRARY)
编译jni
打开cygwin命令行，切换到项目目录/jni，输入$NDK/ndk-build，回车
$ cd /cygdrive/e/android/workspace/FishEye/jni
[email protected] /cygdrive/e/android/workspace/FishEye/jni
$
[email protected] /cygdrive/e/android/workspace/FishEye/jni
$ $NDK/ndk-build
Compile thumb : fisheye <= com_baony_fisheys_NativeFishEye.c
SharedLibrary : libfisheye.so
Install : libfisheye.so => libs/armeabi/libfisheye.so
[email protected] /cygdrive/e/android/workspace/FishEye/jni
$
至此，jni编译完成
Java代码调用Native接口
package com.baony.fisheys;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
import android.app.Activity;
import android.content.pm.ActivityInfo;
public class FishEye extends Activity {
private Spinner m_imageType;
private Spinner m_carSide;
private Button m_openFile;
private Button m_openImage;
private NativeFishEye m_nativeFishEye;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_fish_eye);
initViews();
}
private void initViews()
{
m_nativeFishEye = new NativeFishEye();
m_openFile = (Button)findViewById(R.id.bv_openfile);
m_openImage = (Button)findViewById(R.id.bv_openimage);
m_imageType = (Spinner)findViewById(R.id.bv_imagetype);
m_carSide = (Spinner)findViewById(R.id.bv_carside);
m_openFile.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
Toast.makeText(getApplicationContext(),
"OpenFile retval="+m_nativeFishEye.openFile(), Toast.LENGTH_SHORT)
.show();
}});
m_openImage.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),
"OpenImage retval="+m_nativeFishEye.openImage(0), Toast.LENGTH_SHORT)
.show();
}});
m_imageType.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
String value = (String)parent.getItemAtPosition(position);
Toast.makeText(getApplicationContext(), "Image Type: "+value, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}});
m_carSide.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
String value = (String)parent.getItemAtPosition(position);
Toast.makeText(getApplicationContext(), "Car Side: "+value, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}});
}
}
运行结果如下
OpenFile retval=65277
图贴不上来啊，郁闷啊！！！