【易源码2017】【线程池源码详解】【github源码源代码】android jni 源码-皮皮网

【易源码2017】【线程池源码详解】【github源码源代码】android jni 源码

时间：2024-12-22 21:53:29 分类：热点来源：指标源码怎么解

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

android jni 源码

Android NDK Jni å¼åCåC++çåºå«

1.åæ¥ä¸ä¸ªç¨Cåçä¾åï¼

1 #include <jni.h>

3 jstring Java_com_example_Hello_hello(JNIEnv* env, jobject thiz) {

4 return (*env)->NewStringUTF(env,"Hello Jni---->C!");

5 }

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1 LOCAL_PATH := $(call my-dir)

3 include $(CLEAR_VARS)

5 LOCAL_MODULE := hello

6 LOCAL_SRC_FILES := hello.c

8 include $(BUILD_SHARED_LIBRARY)

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2.åæ¥ä¸ä¸ªç¨C++åçä¾åï¼

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1 #include <jni.h>

3 #ifdef __cplusplus

4 extern "C" {

5 #endif

6 jstring Java_com_example_Hello_hello(JNIEnv* env, jobject thiz) {

7 return env->NewStringUTF("Hello Jni---->C++!");

8 }

9 #ifdef __cplusplus

}

#endif

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1 LOCAL_PATH := $(call my-dir)

3 include $(CLEAR_VARS)

5 LOCAL_MODULE := hello

6 LOCAL_SRC_FILES := hello.cpp

8 include $(BUILD_SHARED_LIBRARY)

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，源码易源码2017作为开发工具包，源码线程池源码详解允许开发者用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github源码源代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，hmi通讯库源码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，真实项目的源码你需要配置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。

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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

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ããprivatenativeString GetReply();

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ãã.publicvoidonClick(View arg0) {

ãã.edtName.setText(reply);

ãã.}

ããpublicvoidonClick(View arg0) {

ããedtName.setText(reply);

ãã}

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ãã.$cd ~/project/Android/JNITest/bin

ãã$cd ~/project/Android/JNITest/bin

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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.}

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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}

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【易源码2017】【线程池源码详解】【github源码源代码】android jni 源码

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