转自：http://blog.csdn.net/jdh99/article/details/51765441
环境
- 主机:WIN10
- 开发环境:Android Studio2.2 Preview 3
步骤
- 安装NDK
打开Tools->Android->SDK Manager->SDK Tools选中LLDB和NDK，点击确认，软件会自动安装NDK。
配置环境变量
- 增加一项：NDK_ROOT，如：C:\soft\adt-bundle-windows-x86-20130911\sdk\ndk-bundle
- 在path中增加%NDK_ROOT%
在main中新建文件夹jni
- 新建hello-jni.c
函数需按照规则命名：Java_包名类名方法名
/* * 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. * *//* This is a trivial JNI example where we use a native method * to return a new VM String. See the corresponding Java source * file located at: * * apps/samples/hello-jni/project/src/com/example/hellojni/HelloJni.java *///jstring//Java_com_bazhangkeji_MainActivity_stringFromJNI( JNIEnv* env,// jobject thiz )//{// return (*env)->NewStringUTF(env, "Hello from JNI !");//}JNIEXPORT jstring JNICALLJava_com_bazhangkeji_demo01_MainActivity_stringFromJNI(JNIEnv *env, jobject instance) {// // TODO////// return (*env)->NewStringUTF(env, returnValue); return (*env)->NewStringUTF(env, "Hello from JNI !");}
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# 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 := hello-jniLOCAL_SRC_FILES := hello-jni.cinclude $(BUILD_SHARED_LIBRARY)
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- 在build.gradle中配置
配置好，make project即可生成.so文件在app\build\intermediates\ndk-build\debug\lib中。
增加语句：
externalNativeBuild { ndkBuild { path file("src\\main\\jni\\Android.mk") } }
完整的代码：
apply plugin: 'com.android.application'android { compileSdkVersion 24 buildToolsVersion "24.0.0" defaultConfig { applicationId "com.bazhangkeji.demo01" minSdkVersion 15 targetSdkVersion 24 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } externalNativeBuild { ndkBuild { path file("src\\main\\jni\\Android.mk") } }}dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:24.0.0' compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha3' compile 'com.android.support:design:24.0.0' testCompile 'junit:junit:4.12' androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2' androidTestCompile 'com.android.support.test:runner:0.5' androidTestCompile 'com.androd.support:support-annotations:24.0.0'}
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public class MainActivity extends AppCompatActivity { private static final int RECORDER_SAMPLERATE = 8000; private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO; private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT; private AudioRecord recorder = null; private Thread recordingThread = null; private boolean isRecording = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); setButtonHandlers(); enableButtons(false); int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING); System.out.println(stringFromJNI()); } public native String stringFromJNI(); public native String unimplementedStringFromJNI(); static { System.loadLibrary("hello-jni"); }
