Android Studio2.2 配置NDK

 

本文博客链接:,作者:jdh,转载请注明.

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. * */#include 
    
     #include 
     
      /* 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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• 新建Android.mk

# 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")        }    }  
  
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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"//        ndk {
    //            moduleName "libspeex"//            cFlags "-std=c++11 -fexceptions"//            ldLibs "log"//            stl "gnustl_shared"//            abiFilter "armeabi-v7a"//        }    }    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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• 在java层调用

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");    }  
  
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