【uex源码教程】【花海文创源码】【收发货统计源码】android jni源码-皮皮网

【uex源码教程】【花海文创源码】【收发货统计源码】android jni源码

时间：2024-11-28 20:13:59 来源：kangle vhms源码作者：jetty源码怎么下载

1.Android NDK Jni å¼åCåC++çåºå«
2.Android JNI/NDK环境的源码配置与Demo编译
3.å®åjniå¼åï¼
4.å¦ä½å¨Androidä¸ä½¿ç¨JNI

android jni源码

Android NDK Jni å¼åCåC++çåºå«

Android JNI/NDK环境的配置与Demo编译

在Android开发中，JNI（Java Native Interface）与NDK（Native Development Kit）起着关键作用，源码它们旨在提升性能、源码代码复用和访问底层资源。源码

NDK，源码uex源码教程作为开发工具包，源码花海文创源码允许开发者用C和C++编写应用组件，源码提供了必要的源码工具和库来编译本地代码并生成.so文件。它适用于优化性能、源码利用现有C/C++库和直接操作系统底层API。源码

JNI则连接Java和本地代码，源码使得Java能调用C/C++实现的源码函数，反之亦然。源码收发货统计源码对于计算密集型任务或对实时性要求高的源码场景，JNI能显著提高性能。源码例如，游戏开发中，汉源码头住房JNI和NDK能提供流畅的游戏体验，通过C/C++直接操作图像和硬件。

要使用这些工具，首先，源码礼盒装你需要配置NDK环境。接着，从Java类生成JNI头文件，编写并实现C/C++代码，用CMake或ndk-build进行编译。在Android项目中，确保build.gradle配置了NDK，通过Gradle编译项目，并在Java代码中加载.so库，调用本地方法。

总的来说，通过正确的配置和实践，JNI和NDK为Android开发者提供了强大的性能优化和扩展能力。要体验它们的效益，开发者需要遵循特定的步骤和配置，以确保代码的顺利编译和运行。

å®åjniå¼åï¼

å¦ä½ç¼åå®åè½¯ä»¶

2ãä¸é¢æå°±å¼å§ä»ç»æä»¬å¼åéè¦ç¨çè½¯ä»¶ï¼Xcode(è½¯ä»¶ä¸è½½å°åï¼developer.apple/xcode/)ï¼IOSæ¨¡æå¨ã

5ãEclipseADTEclipseADTæ¯Eclipseå¹³å°ä¸ç¨æ¥å¼åAndroidåºç¨ç¨åºçæä»¶TheSDKandAVDManagerè¯¥å·¥å·åå«å¾å¤éè¦çåè½ï¼åæ¬ç®¡çä¸åçAndroidSDKçæ¬ï¼æå»ºç®æ ï¼ï¼Androidççæ¬ä¼å¤ï¼APIä¸æäºå¼å®¹æ§é®é¢ã

Androidä¸æä¹éè¿JNIç¼ç¨å»åéadbæä»¤æ§å¶ææº

(constchar*)(*env)-GetStringUTFChars(envï¼inputStrï¼JNI_FALSE)ï¼LOGI(dufresne---%sï¼(constchar*)str)ï¼//éç¥èææºæ¬å°ä»£ç ä¸åéè¦éè¿strè®¿é®Javaåç¬¦ä¸²ã

$cd~/project/Android/JNITest/bin$cd~/project/Android/JNITest/binæä»¬ç¨lså½ä»¤æ¥çï¼å¯ä»¥çå°binç®å½ä¸æä¸ªclassesç®å½ï¼å¶ç®å½ç»æä¸ºclasses/org/tonny/jniï¼å³classesçåç®å½ç»ææ¯androidå·¥ç¨çååorg.tonny.jniã

å¦ä½ç¨javaè¿è¡å®ååºç¨çå¼å

ç¬¬ä¸æ¥ï¼å®è£jdkï¼éç½®jdkç¯å¢ãç¾åº¦æjdkéç½®ç¬¬äºæ¥ï¼å®è£AndroidStudio+SDKãæèEclipse+ADT+AndroidSDKãç¬¬ä¸æ¥ï¼éè¦Androidæºåæèå®è£èææºãå¦æçé®ï¼è¯·æåºã

ç¨jniåçå®ååºç¨è½è¢«åç¼è¯å

å¦ä½JAVAä»£ç è°ç¨ï¼jniå§ï¼å®åçSOæä»¶æ¯linuxä¸çæä»¶ï¼ç¨cæèc++åçã

å®åå¼åè°ç¨åºå±ç¡¬ä»¶

å¯ä»¥åèä¸ä¸/sdk/ndk/index.htmlä¸è½½ndkï¼ç®åææ°çæ¬ä¸ºandroid-ndk-r6b-linux-x.tar.bz2.

ããï¼2ï¼è§£åndkå°å·¥ä½ç®å½ï¼

ãã[plain] view plaincopyprint?

ãã.$tar -xvf android-ndk-r6b-linux-x.tar.bz2

ãã.$sudo mv android-ndk-r6b /usr/local/ndk

ãã$tar -xvf android-ndk-r6b-linux-x.tar.bz2

ãã$sudo mv android-ndk-r6b /usr/local/ndk

ããï¼3ï¼è®¾ç½®ndkç¯å¢åé

ãã[plain] view plaincopyprint?

ãã.$sudo vim /etc/profile

ãã.exportPATH=/usr/local/ndk:$PATH

ãã$sudo vim /etc/profile

ããexportPATH=/usr/local/ndk:$PATH

ããç¼è¾å®æ¯åä¿åéåºï¼å¹¶éå¯çæ

ããï¼4ï¼éªè¯å®è£

ãã[plain] view plaincopyprint?

ãã.$ cd/usr/local/ndk/samples/hello-jni/

ãã.$ ndk-build

ãã.Gdbserver : [arm-linux-androideabi-4.4.3] libs/armeabi/gdbserver

ãã.Gdbsetup : libs/armeabi/gdb.setup

ãã.Install : libhello-jni.so => libs/armeabi/libhello-jni.so

ãã$ cd/usr/local/ndk/samples/hello-jni/

ãã$ ndk-build

ããGdbserver : [arm-linux-androideabi-4.4.3] libs/armeabi/gdbserver

ããGdbsetup : libs/armeabi/gdb.setup

ããInstall : libhello-jni.so => libs/armeabi/libhello-jni.so

ãã3.JNIå®ç°

ãã3.1.ç¼åJavaåºç¨ç¨åºä»£ç

ããï¼1ï¼å¯å¨Eclipseï¼æ°å»ºandroidå·¥ç¨

ããProjectï¼JNITest

ããPackageï¼org.tonny.jni

ããActivityï¼JNITest

ããï¼2ï¼ç¼è¾èµæºæä»¶

ããç¼è¾res/values/strings.xmlæä»¶å¦ä¸ï¼

ãã

ããç¼è¾res/layout/main.xmlæä»¶

ããï¼3ï¼ç¼è¾JNITest.javaæä»¶

ããåçè¿ä¸æ®µï¼

ãã[java] view plaincopyprint?

ãã.privatenativeString GetReply();

ããprivatenativeString GetReply();

ãã[java] view plaincopyprint?

ãã.publicvoidonClick(View arg0) {

ãã.edtName.setText(reply);

ãã.}

ããpublicvoidonClick(View arg0) {

ããedtName.setText(reply);

ãã}

ããï¼4ï¼ç¼è¯å·¥ç¨ï¼çæ.classæä»¶ã

ãã3.2.ç¨javahå·¥å·çæç¬¦åJNIè§èçcè¯è¨å¤´æä»¶

ããå¨ç»ç«¯ä¸ï¼è¿å¥androidå·¥ç¨æå¨çbinç®å½

ãã[plain] view plaincopyprint?

ãã.$cd ~/project/Android/JNITest/bin

ãã$cd ~/project/Android/JNITest/bin

ããæä»¬ç¨lså½ä»¤æ¥çï¼å¯ä»¥çå°binç®å½ä¸æä¸ªclassesç®å½ï¼å¶ç®å½ç»æä¸ºclasses/org/tonny/jniï¼å³classesçåç®å½ç»ææ¯androidå·¥ç¨çååorg.tonny.jniãè¯·æ³¨æï¼ä¸é¢æä»¬åå¤æ§è¡javahå½ä»¤çæ¶åï¼å¿é¡»è¿å¥å°org/tonny/jniçä¸çº§ç®å½ï¼å³classesç®å½ï¼å¦åjavahä¼æç¤ºæ¾ä¸å°ç¸å³çjavaç±»ã

ããä¸é¢ç»§ç»ï¼

ãã[plain] view plaincopyprint?

ãã.$cd classes

ãã.$javah org.tonny.jni.JNITest

ãã.$ls

ãã.org org_tonny_jni_JNITest.h

ãã$cd classes

ãã$javah org.tonny.jni.JNITest

ãã$ls

ããorg org_tonny_jni_JNITest.h

ããæ§è¡javahorg.tonny.jni.JNITestå½ä»¤ï¼å¨classesç®å½ä¸ä¼çæorg_tonny_jni_JNITest.hå¤´æä»¶ãå¦æä¸è¿å¥å°classesç®å½ä¸çè¯ï¼ä¹å¯ä»¥è¿æ ·ï¼

ãã[plain] view plaincopyprint?

ãã.$javah -classpath ~/project/Android/JNITest/bin/classesorg.tonny.jni.JNITest

ãã$javah -classpath ~/project/Android/JNITest/bin/classesorg.tonny.jni.JNITest

ãã-classpath åæ°è¡¨ç¤ºè£è½½ç±»çç®å½ã

ãã3.3.ç¼åc/c++ä»£ç

ããçæorg_tonny_jni_JNITest.hå¤´æä»¶åï¼æä»¬å°±å¯ä»¥ç¼åç¸åºçå½æ°ä»£ç äºãä¸é¢å¨androidå·¥ç¨ç®å½ä¸æ°å»ºjniç®å½ï¼å³~/project/Android/JNITest/jniï¼æorg_tonny_jni_JNITest.hå¤´æä»¶æ·è´å°jniç®å½ä¸ï¼å¹¶å¨jniç®å½ä¸æ°å»ºorg_tonny_jni_JNITest.cæä»¶ï¼ç¼è¾ä»£ç å¦ä¸ï¼

ãã[cpp] view plaincopyprint?

ãã.#include<jni.h>

ãã.#include<string.h>

ãã.#include"org_tonny_jni_JNITest.h"

ãã.

ãã.JNIEXPORTjstring JNICALLJava_org_tonny_jni_JNITest_GetReply

ãã.(JNIEnv *env, jobject obj){

ãã.return(*env)->NewStringUTF(env,(char*)"Hello,JNITest");

ãã.}

ãã#include<jni.h>

ãã#include<string.h>

ãã#include"org_tonny_jni_JNITest.h"

ããJNIEXPORTjstring JNICALLJava_org_tonny_jni_JNITest_GetReply

ãã(JNIEnv *env, jobject obj){

ããreturn(*env)->NewStringUTF(env,(char*)"Hello,JNITest");

ãã}

ãã3.4.ç¼åAndroid.mkæä»¶

ããå¨~/project/Android/JNITest/jniç®å½ä¸æ°å»ºAndroid.mkæä»¶ï¼androidå¯ä»¥æ ¹æ®è¿ä¸ªæä»¶çç¼è¯åæ°ç¼è¯æ¨¡åãç¼è¾Android.mkæä»¶å¦ä¸ï¼

ãã[plain] view plaincopyprint?

ãã.LOCAL_PATH:= $(call my-dir)

ãã.include$(CLEAR_VARS)

ãã.LOCAL_MODULE := libJNITest

ãã.LOCAL_SRC_FILES:= org_tonny_jni_JNITest.c

ãã.include$(BUILD_SHARED_LIBRARY)

ããLOCAL_PATH:= $(call my-dir)

ããinclude$(CLEAR_VARS)

ããLOCAL_MODULE := libJNITest

ããLOCAL_SRC_FILES:= org_tonny_jni_JNITest.c

ããinclude$(BUILD_SHARED_LIBRARY)

ããLOCAL_MODULEè¡¨ç¤ºç¼è¯çå¨æåºåç§°

ããLOCAL_SRC_FILES è¡¨ç¤ºæºä»£ç æä»¶

ãã3.5.ç¨ndkå·¥å·ç¼è¯å¹¶çæ.soæä»¶

ããè¿å¥å°JNITestçå·¥ç¨ç®å½ï¼æ§è¡ndk-buildå½ä»¤å³å¯çælibJNITest.soæä»¶ã

ãã[plain] view plaincopyprint?

ãã.$cd ~/project/Android/JNITest/

ãã.$ndk-build

ãã.Invalidattribute name:

ãã.package

ãã.Install : libJNITest.so => libs/armeabi/libJNITest.so

ãã$cd ~/project/Android/JNITest/

ãã$ndk-build

ããInvalidattribute name:

ããpackage

ããInstall : libJNITest.so => libs/armeabi/libJNITest.so

ããå¯ä»¥çå°ï¼å¨å·¥ç¨ç®å½çlibs/armeabiç®å½ä¸çæäºlibJNITest.soæä»¶ã

ãã3.6.å¨æ¨¡æå¨ä¸è¿è¡

ãã[plain] view plaincopyprint?

ãã.$cd ~/software/android/android-sdk-linux/tools

ãã.$./emulator @AVD-2.3.3-V -partition-size

ãã$cd ~/software/android/android-sdk-linux/tools

ãã$./emulator @AVD-2.3.3-V -partition-size

ããAVD-2.3.3-Vè¡¨ç¤ºä½ çæ¨¡æå¨åç§°ï¼ä¸å¨Eclipse->AVDManagerä¸çAVDNameå¯¹åºï¼-partition-sizeè¡¨ç¤ºæ¨¡æå¨çåå¨è®¾å¤å®¹éã

ãã[plain] view plaincopyprint?

ãã.$cd ~/project/Android/JNITest/libs/armeabi/

ãã.$adb remount

ãã.$adb push libJNITest.so /system/lib

ãã. KB/s ( bytes in 0.s)

ãã$cd ~/project/Android/JNITest/libs/armeabi/

ãã$adb remount

ãã$adb push libJNITest.so /system/lib

ãã KB/s ( bytes in 0.s)

ããå½å¨ç»ç«¯ä¸çå°æ KB/s ( bytes in 0.s)ä¼ è¾éåº¦çä¿¡æ¯çæ¶åï¼è¯´ææ·è´æåã

关键词：lnmp源码安装

【uex源码教程】【花海文创源码】【收发货统计源码】android jni源码

热点关注