android jni开发详细步骤

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

# 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

Administrator@WM-20120727KYRW /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

Administrator@WM-20120727KYRW /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！！！

Jni开发步骤：

环境说明：

新建android工程

创建接口类

生成.h头文件

根据生成的.h文件，创建.c文件

编译jni

Java代码调用Native接口

运行结果如下

更多相关文章

随机推荐