├── .gitignore ├── LICENSE ├── README.md ├── app ├── .gitignore ├── CMakeLists.txt ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── example │ │ └── wutao │ │ └── nativedemo │ │ └── ExampleInstrumentedTest.java │ ├── main │ ├── AndroidManifest.xml │ ├── cpp │ │ ├── native.c │ │ └── native.h │ ├── java │ │ └── com │ │ │ └── example │ │ │ └── wutao │ │ │ └── nativedemo │ │ │ ├── MainActivity.java │ │ │ ├── NativeUtils.java │ │ │ └── OnNativeCallback.java │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ └── ic_launcher_background.xml │ │ ├── layout │ │ └── activity_main.xml │ │ ├── mipmap-anydpi-v26 │ │ ├── ic_launcher.xml │ │ └── ic_launcher_round.xml │ │ ├── mipmap-hdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-mdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ └── values │ │ ├── colors.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── com │ └── example │ └── wutao │ └── nativedemo │ └── ExampleUnitTest.java ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | # IntelliJ IDEA project files 2 | .idea/ 3 | *.iml 4 | *.ipr 5 | *.iws 6 | out/ 7 | 8 | # Eclipse project files 9 | .classpath 10 | .settings/ 11 | .project 12 | 13 | # Android old builds 14 | bin/ 15 | gen/ 16 | local.properties 17 | 18 | # Gradle build 19 | .gradle/ 20 | build/ 21 | 22 | # C/C++ compile temp files 23 | *.o 24 | *.o.d 25 | 26 | # Android 2.2 C/C++ compile 27 | .externalNativeBuild/ 28 | 29 | # OS auto gen folder infomation 30 | .DS_Store 31 | Thumbs.db 32 | 33 | # Temp files 34 | *.tmp 35 | *.temp 36 | *.swp 37 | *.vpp~* 38 | *.*~ 39 | ~*.* -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Android NDK — Java 与 C/C++ 的互相调用 2 | > 本文使用的 native 代码以 c语言为例，c++代码类似。 3 | 这里主要介绍 C 调 Java 的两种方法，Java 调 C 比较简单。 4 | 5 | [原文链接](https://www.jianshu.com/p/cdfcfc7489bb) 6 | 7 | ## Java 调 C 8 | 1. 加载 so 库,"native-lib"为库名。 9 | ```java 10 | static { 11 | System.loadLibrary("native-lib"); 12 | } 13 | ``` 14 | 2. Java native方法 15 | ``` java 16 | public native void test(); 17 | ``` 18 | 写一个带 native 关键字的方法，写完之后 Android Studio 会提示红色错误，直接 alt + enter 解决报错，然后会在配置好 jni 环境下会在 .c 的文件下直接生成类似下面的代码。 19 | ```java 20 | Java_com_immusician_unity_UnityPlayerActivity_test(JNIEnv *env, jobject instance) { 21 | } 22 | ``` 23 | 方法格式：以下划线连接 "Java" + "包名" + "native方法所在的类名" + "对应的native方法名" 24 | 然后就可以这个方法体内写相应的代码逻辑了，至此 Java 调 C 就介绍完了。当然上述步骤也可以反过来完成，只不过c的方法没办法自动生成，容易写错，所以推荐按上述步骤来写，是不是很简单呢。 25 | 26 | ## C调Java 27 | 28 | #### 方法一 29 | 可以在 Java native 方法的参数列表中传入一个 Java 对象，然后 C 里面 30 | 通过对象调方法回调 Java ，和 Java 里面常见的 setCallback 是一个道理。 31 | 具体步骤如下： 32 | 1. 调用 setCallback 时传入实现了该接口的实例。 33 | ``` java 34 | //自定义的一个接口 35 | public interface OnNativeCallback { 36 | void callbackForNative(int i); 37 | } 38 | 39 | ... 40 | 41 | //这里可以不是static，为了方便就这样写了 42 | public native static void setCallback1(OnNativeCallback callback); 43 | ``` 44 | 2. 在native方法中回调 Java 45 | ```c 46 | JNIEXPORT void JNICALL 47 | Java_com_example_wutao_nativedemo_NativeUtils_setCallback1(JNIEnv *env, jclass type, jobject callback) { 48 | //通过传进来的对象找到该类 49 | jclass javaClass = (*env)->GetObjectClass(env, callback); 50 | if (javaClass == 0) { 51 | return; 52 | } 53 | //获取要回调的方法ID,回调java方法 54 | jmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass, "callbackForNative", "(I)V"); 55 | (*env)->CallVoidMethod(env, callback, javaCallbackId, 123); 56 | } 57 | ``` 58 | 上面的调用步骤就相当于 Java 中对象调方法，当然也可以改成直接调用静态方法，那样可以不传对象，步骤也差不多，但是这种方法更符合 Java 的思维方式；这里有些地方不明白的可以看我下一片文章。 59 | 60 | #### 方法二 61 | 方法二是方法一的延伸，方法一只适合在当前线程中回调，就会有局限性，所以研究了一种在多线程中回调的方法，基本步骤和方法一中差别不大，只是涉及了 native中的线程的使用，对 pthread 线程不熟悉的可以查看我这篇文章[Android NDK — Native 线程 pthread](https://www.jianshu.com/p/34d88df0cfe0)。 62 | 1. 同方法一步骤一 63 | 2. 在子线程中回调 64 | ```c 65 | JavaVM* java_vm = NULL; 66 | 67 | JNIEXPORT void JNICALL 68 | Java_com_example_wutao_nativedemo_NativeUtils_setCallback2(JNIEnv *env, jclass type, jobject callback) { 69 | pthread_t pthread; 70 | pthread_attr_t pthreadAttr; // 线程属性 71 | 72 | jobject g_callback = (*env)->NewGlobalRef(env, callback);// 生成全局引用 73 | 74 | pthread_attr_init(&pthreadAttr); //初始化线程属性 75 | pthread_attr_setdetachstate(&pthreadAttr, PTHREAD_CREATE_DETACHED); 76 | 77 | pthread_create(&pthread,&pthreadAttr,callbackRunnable,g_callback);// 创建线程 78 | } 79 | 80 | void callbackRunnable(void *callback) { 81 | JNIEnv *env = NULL; 82 | int ret = 0; 83 | 84 | for (int i = 0; i < 10000; ++i) { 85 | ret++; 86 | } 87 | 88 | (*java_vm)->AttachCurrentThread(java_vm,&env,NULL); 89 | 90 | jclass javaClass = (*env)->GetObjectClass(env, callback); 91 | if (javaClass == 0) { 92 | return; 93 | } 94 | //获取要回调的方法ID,回调java方法 95 | jmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass, "callbackForNative", "(I)V"); 96 | (*env)->CallVoidMethod(env, callback, javaCallbackId, ret); 97 | 98 | // 删除全局引用 99 | (*env)->DeleteGlobalRef(env,callback); 100 | (*java_vm)->DetachCurrentThread(java_vm); 101 | 102 | //释放线程资源 103 | pthread_exit(NULL); 104 | } 105 | 106 | //当.so库加载的时候会调用，用于获取JavaVM 107 | JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) { 108 | JNIEnv *env; 109 | 110 | if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) 111 | { 112 | return -1; 113 | } 114 | java_vm = vm; 115 | 116 | return JNI_VERSION_1_4; 117 | } 118 | 119 | ``` 120 | 以上就是c 回调 java 的两种方法，基本上适用于大部分情况了，如果有补充的，欢迎留言。 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | # IntelliJ IDEA project files 2 | .idea/ 3 | *.iml 4 | *.ipr 5 | *.iws 6 | out/ 7 | 8 | # Eclipse project files 9 | .classpath 10 | .settings/ 11 | .project 12 | 13 | # Android old builds 14 | bin/ 15 | gen/ 16 | local.properties 17 | 18 | # Gradle build 19 | .gradle/ 20 | build/ 21 | 22 | # C/C++ compile temp files 23 | *.o 24 | *.o.d 25 | 26 | # Android 2.2 C/C++ compile 27 | .externalNativeBuild/ 28 | 29 | # OS auto gen folder infomation 30 | .DS_Store 31 | Thumbs.db 32 | 33 | # Temp files 34 | *.tmp 35 | *.temp 36 | *.swp 37 | *.vpp~* 38 | *.*~ 39 | ~*.* -------------------------------------------------------------------------------- /app/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | cmake_minimum_required(VERSION 3.4.1) 2 | 3 | add_library( native-lib 4 | 5 | SHARED 6 | 7 | src/main/cpp/native.c ) 8 | 9 | find_library( log-lib 10 | 11 | log ) 12 | 13 | target_link_libraries( native-lib 14 | 15 | android 16 | ${log-lib} ) -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 26 5 | defaultConfig { 6 | applicationId "com.example.wutao.nativedemo" 7 | minSdkVersion 15 8 | targetSdkVersion 26 9 | versionCode 1 10 | versionName "1.0" 11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 12 | externalNativeBuild { 13 | cmake { 14 | cppFlags "" 15 | } 16 | } 17 | } 18 | buildTypes { 19 | release { 20 | minifyEnabled false 21 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 22 | } 23 | } 24 | externalNativeBuild { 25 | cmake { 26 | path "CMakeLists.txt" 27 | } 28 | } 29 | } 30 | 31 | dependencies { 32 | implementation fileTree(dir: 'libs', include: ['*.jar']) 33 | implementation 'com.android.support:appcompat-v7:26.1.0' 34 | implementation 'com.android.support.constraint:constraint-layout:1.0.2' 35 | testImplementation 'junit:junit:4.12' 36 | androidTestImplementation 'com.android.support.test:runner:1.0.1' 37 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' 38 | } 39 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/example/wutao/nativedemo/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.example.wutao.nativedemo; 2 | 3 | import android.content.Context; 4 | import android.support.test.InstrumentationRegistry; 5 | import android.support.test.runner.AndroidJUnit4; 6 | 7 | import org.junit.Test; 8 | import org.junit.runner.RunWith; 9 | 10 | import static org.junit.Assert.*; 11 | 12 | /** 13 | * Instrumented test, which will execute on an Android device. 14 | * 15 | * @see Testing documentation 16 | */ 17 | @RunWith(AndroidJUnit4.class) 18 | public class ExampleInstrumentedTest { 19 | @Test 20 | public void useAppContext() throws Exception { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("com.example.wutao.nativedemo", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /app/src/main/cpp/native.c: -------------------------------------------------------------------------------- 1 | // 2 | // Created by 吴涛 on 2018/4/3. 3 | // 对比三种方式线程的创建和退出 4 | // 5 | 6 | #include "native.h" 7 | #include 8 | #include 9 | 10 | JavaVM* java_vm = NULL; 11 | pthread_attr_t pthreadAttr; // 线程属性 12 | pthread_t pthread2; 13 | 14 | void callbackRunnable(void *callback); 15 | void callbackRunnable2(void *callback); 16 | void callbackRunnable3(void *callback); 17 | void destroy(); 18 | 19 | JNIEXPORT void JNICALL 20 | Java_com_example_wutao_nativedemo_NativeUtils_setCallback1(JNIEnv *env, jclass type, jobject callback) { 21 | // 通过传进来的对象找到该类 22 | jclass javaClass = (*env)->GetObjectClass(env, callback); 23 | if (javaClass == 0) { 24 | return; 25 | } 26 | // 获取要回调的方法ID,回调java方法 27 | jmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass, "callbackForNative", "(I)V"); 28 | (*env)->CallVoidMethod(env, callback, javaCallbackId, 123); 29 | } 30 | 31 | JNIEXPORT void JNICALL 32 | Java_com_example_wutao_nativedemo_NativeUtils_setCallback2(JNIEnv *env, jclass type, jobject callback) { 33 | pthread_t pthread; 34 | 35 | 36 | jobject g_callback = (*env)->NewGlobalRef(env, callback);// 生成全局引用 37 | 38 | pthread_attr_init(&pthreadAttr); //初始化线程属性 39 | pthread_attr_setdetachstate(&pthreadAttr, PTHREAD_CREATE_DETACHED); 40 | 41 | // 创建线程 42 | pthread_create(&pthread,&pthreadAttr,callbackRunnable,g_callback); //方式一 // 线程状态指定为unjoinable 43 | 44 | //pthread_create(&pthread2,NULL,callbackRunnable2,g_callback); //方式二 默认的状态是joinable 45 | 46 | //pthread_create(&pthread2,NULL,callbackRunnable3,g_callback); //方式三 默认的状态是joinable 47 | } 48 | 49 | JNIEXPORT void JNICALL 50 | Java_com_example_wutao_nativedemo_NativeUtils_destroy(JNIEnv *env, jclass type) { 51 | 52 | destroy(); 53 | } 54 | 55 | // 方式一 56 | void callbackRunnable(void *callback) { 57 | JNIEnv *env = NULL; 58 | int ret = 0; 59 | 60 | for (int i = 0; i < 10000; ++i) { 61 | ret++; 62 | } 63 | 64 | (*java_vm)->AttachCurrentThread(java_vm,&env,NULL); 65 | 66 | jclass javaClass = (*env)->GetObjectClass(env, callback); 67 | if (javaClass == 0) { 68 | return; 69 | } 70 | // 获取要回调的方法ID,回调java方法 71 | jmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass, "callbackForNative", "(I)V"); 72 | (*env)->CallVoidMethod(env, callback, javaCallbackId, ret); 73 | 74 | // 删除全局引用 75 | (*env)->DeleteGlobalRef(env,callback); 76 | (*java_vm)->DetachCurrentThread(java_vm); 77 | 78 | // 释放线程资源 79 | pthread_attr_destroy(&pthreadAttr); 80 | pthread_exit(NULL); //！！！自动释放 81 | } 82 | 83 | // 方式二 84 | void callbackRunnable2(void *callback) { 85 | JNIEnv *env = NULL; 86 | int ret = 0; 87 | char *memory = NULL; 88 | 89 | for (int i = 0; i < 20000; ++i) { 90 | ret++; 91 | } 92 | 93 | //！！！手动创建内存 94 | memory = (char *) calloc(1, sizeof(char)*1024); 95 | 96 | (*java_vm)->AttachCurrentThread(java_vm,&env,NULL); 97 | 98 | jclass javaClass = (*env)->GetObjectClass(env, callback); 99 | if (javaClass == 0) { 100 | return; 101 | } 102 | // 获取要回调的方法ID,回调java方法 103 | jmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass, "callbackForNative", "(I)V"); 104 | (*env)->CallVoidMethod(env, callback, javaCallbackId, ret); 105 | 106 | // 删除全局引用 107 | (*env)->DeleteGlobalRef(env,callback); 108 | (*java_vm)->DetachCurrentThread(java_vm); 109 | 110 | // 释放线程资源 111 | pthread_exit(memory); ///！！！手动释放 112 | } 113 | 114 | // 方式三 115 | void callbackRunnable3(void *callback) { 116 | JNIEnv *env = NULL; 117 | int ret = 0; 118 | 119 | for (int i = 0; i < 30000; ++i) { 120 | ret++; 121 | } 122 | 123 | (*java_vm)->AttachCurrentThread(java_vm,&env,NULL); 124 | 125 | jclass javaClass = (*env)->GetObjectClass(env, callback); 126 | if (javaClass == 0) { 127 | return; 128 | } 129 | // 获取要回调的方法ID,回调java方法 130 | jmethodID javaCallbackId = (*env)->GetMethodID(env, javaClass, "callbackForNative", "(I)V"); 131 | (*env)->CallVoidMethod(env, callback, javaCallbackId, ret); 132 | 133 | // 删除全局引用 134 | (*env)->DeleteGlobalRef(env,callback); 135 | (*java_vm)->DetachCurrentThread(java_vm); 136 | 137 | pthread_detach(pthread_self());// 将状态改为unjoinable状态，确保资源的释放 138 | 139 | // 释放线程资源 140 | pthread_exit(0); //！！！ 141 | } 142 | 143 | // so库加载时调用 144 | JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) { 145 | JNIEnv *env; 146 | 147 | if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) 148 | { 149 | return -1; 150 | } 151 | java_vm = vm; 152 | 153 | return JNI_VERSION_1_4; 154 | } 155 | 156 | void destroy(){ 157 | void *pVoid = NULL; 158 | 159 | pthread_join(pthread2, &pVoid);// 结束线程 160 | if (pVoid != NULL) { 161 | free(pVoid); // 方式二线程结束释放内存 162 | LOGD("方式二释放资源"); 163 | } 164 | } 165 | -------------------------------------------------------------------------------- /app/src/main/cpp/native.h: -------------------------------------------------------------------------------- 1 | // 2 | // Created by 吴涛 on 2018/4/3. 3 | // 4 | 5 | #ifndef NATIVEDEMO_NATIVE_H 6 | #define NATIVEDEMO_NATIVE_H 7 | 8 | #endif //NATIVEDEMO_NATIVE_H 9 | 10 | #include 11 | #include 12 | 13 | #if 1 14 | 15 | #define MODULE_NAME "FFFFFFFFFFFFFFFF" 16 | #define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, MODULE_NAME, __VA_ARGS__) 17 | #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, MODULE_NAME, __VA_ARGS__) 18 | #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, MODULE_NAME, __VA_ARGS__) 19 | #define LOGW(...) __android_log_print(ANDROID_LOG_WARN,MODULE_NAME, __VA_ARGS__) 20 | #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,MODULE_NAME, __VA_ARGS__) 21 | #define LOGF(...) __android_log_print(ANDROID_LOG_FATAL,MODULE_NAME, __VA_ARGS__) 22 | 23 | #else 24 | 25 | #define LOGV(...) 26 | #define LOGD(...) 27 | #define LOGI(...) 28 | #define LOGW(...) 29 | #define LOGE(...) 30 | #define LOGF(...) 31 | #endif 32 | 33 | 34 | JNIEXPORT void JNICALL 35 | Java_com_example_wutao_nativedemo_NativeUtils_setCallback1(JNIEnv *env, jclass type, jobject callback); 36 | 37 | JNIEXPORT void JNICALL 38 | Java_com_example_wutao_nativedemo_NativeUtils_setCallback2(JNIEnv *env, jclass type, jobject callback); 39 | 40 | JNIEXPORT void JNICALL 41 | Java_com_example_wutao_nativedemo_NativeUtils_destroy(JNIEnv *env, jclass type); -------------------------------------------------------------------------------- /app/src/main/java/com/example/wutao/nativedemo/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.wutao.nativedemo; 2 | 3 | import android.content.Context; 4 | import android.support.v7.app.AppCompatActivity; 5 | import android.os.Bundle; 6 | import android.util.Log; 7 | import android.view.View; 8 | import android.widget.Toast; 9 | 10 | /** 11 | * 两种方式 native 回调 java 12 | */ 13 | public class MainActivity extends AppCompatActivity implements OnNativeCallback { 14 | private static final String TAG = "MainActivity"; 15 | 16 | 17 | @Override 18 | protected void onCreate(Bundle savedInstanceState) { 19 | super.onCreate(savedInstanceState); 20 | setContentView(R.layout.activity_main); 21 | 22 | } 23 | 24 | public void onCallback(View view) { 25 | 26 | switch (view.getId()) { 27 | case R.id.button1: 28 | NativeUtils.setCallback1(this); 29 | break; 30 | case R.id.button2: 31 | NativeUtils.setCallback2(this); 32 | break; 33 | case R.id.button3: 34 | NativeUtils.destroy(); 35 | break; 36 | } 37 | } 38 | 39 | @Override 40 | public void callbackForNative(int i) { 41 | Log.d(TAG, "callbackForNative: " + i); 42 | } 43 | 44 | } 45 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/wutao/nativedemo/NativeUtils.java: -------------------------------------------------------------------------------- 1 | package com.example.wutao.nativedemo; 2 | 3 | /** 4 | * Created by wutao on 2018/4/3. 5 | */ 6 | 7 | public class NativeUtils { 8 | 9 | static { 10 | System.loadLibrary("native-lib"); 11 | } 12 | 13 | public native static void setCallback1(OnNativeCallback callback); 14 | 15 | public native static void setCallback2(OnNativeCallback callback); 16 | 17 | public native static void destroy(); 18 | } 19 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/wutao/nativedemo/OnNativeCallback.java: -------------------------------------------------------------------------------- 1 | package com.example.wutao.nativedemo; 2 | 3 | /** 4 | * Created by wutao on 2018/4/3. 5 | */ 6 | 7 | public interface OnNativeCallback { 8 | 9 | void callbackForNative(int i); 10 | } 11 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 10 |