JNI 引入我的MediaAndroid项目

首先在包的main下面创建cpp文件夹

CMakeLists.txt文件

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html# Sets the minimum version of CMake required to build the native library.cmake_minimum_required(VERSION 3.10.2)# Declares and names the project.
# 改这里，项目名小写
project("mediaandroid")# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.# 改这里，项目名小写
add_library( # Sets the name of the library.mediaandroid# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).native-lib.cpp)# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.find_library( # Sets the name of the path variable.log-lib# Specifies the name of the NDK library that# you want CMake to locate.log)# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.# 改这里，项目名小写
target_link_libraries( # Specifies the target library.mediaandroid# Links the target library to the log library# included in the NDK.${log-lib})

Native-lib.cpp

#include <jni.h>
#include <string>extern "C" JNIEXPORT jstring JNICALL
//注意这里是包名_Activity
Java_cn_com_codingce_mediaandroid_MainActivity_stringFromJNI(JNIEnv *env,jobject /* this */) {std::string hello = "Hello from C++";return env->NewStringUTF(hello.c_str());
}

MainActivity

package cn.com.codingce.mediaandroid;import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;import cn.com.codingce.mediaandroid.activity.AACActivity;
import cn.com.codingce.mediaandroid.activity.AudioPCMRenderActivity;
import cn.com.codingce.mediaandroid.activity.ByteBufferActivity;
import cn.com.codingce.mediaandroid.activity.CameraRenderActivity;
import cn.com.codingce.mediaandroid.activity.InkeMainActivity;
import cn.com.codingce.mediaandroid.activity.M4AActivity;
import cn.com.codingce.mediaandroid.activity.MP4ParseAACActivity;
import cn.com.codingce.mediaandroid.activity.MP4ParsePCMActivity;
import cn.com.codingce.mediaandroid.activity.PCMActivity;
import cn.com.codingce.mediaandroid.activity.SurfaceActivity;/*** 采集 → 编码 → 封装 → 解封装 → 解码 → 渲染* <p>* 跳转其他功能*/
public class MainActivity extends AppCompatActivity implements View.OnClickListener {private final String TAG = this.getClass().getSimpleName();// Used to load the 'mediaandroid' library on application startup. 这里static {System.loadLibrary("mediaandroid");}Button main_btn, main_btn1, main_btn2, main_btn3,main_btn4, main_btn5, main_btn6, main_btn7, main_btn8, inke_btn;@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//        PerMissionSet.requestPermission(this);Log.e(TAG, "JNI" + stringFromJNI());//音频录制权限if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions((Activity) this,new String[]{Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO},1);}//存储权限if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions((Activity) this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE},1);}//摄像头权限if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED ||ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED ||ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions((Activity) this,new String[]{Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE},1);}main_btn = findViewById(R.id.main_btn);main_btn.setOnClickListener(this);main_btn1 = findViewById(R.id.main_btn1);main_btn1.setOnClickListener(this);main_btn2 = findViewById(R.id.main_btn2);main_btn2.setOnClickListener(this);main_btn3 = findViewById(R.id.main_btn3);main_btn3.setOnClickListener(this);main_btn4 = findViewById(R.id.main_btn4);main_btn4.setOnClickListener(this);main_btn5 = findViewById(R.id.main_btn5);main_btn5.setOnClickListener(this);main_btn6 = findViewById(R.id.main_btn6);main_btn6.setOnClickListener(this);main_btn7 = findViewById(R.id.main_btn7);main_btn7.setOnClickListener(this);main_btn8 = findViewById(R.id.main_btn8);main_btn8.setOnClickListener(this);//集成映客sdkinke_btn = findViewById(R.id.inke_btn);inke_btn.setOnClickListener(this);}@Overridepublic void onClick(View v) {if (v.getId() == main_btn.getId()) {Intent intent = new Intent();intent.setClass(this, PCMActivity.class);startActivity(intent);}if (v.getId() == main_btn1.getId()) {Intent intent = new Intent();intent.setClass(this, AACActivity.class);startActivity(intent);}if (v.getId() == main_btn2.getId()) {Intent intent = new Intent();intent.setClass(this, M4AActivity.class);startActivity(intent);}if (v.getId() == main_btn3.getId()) {Intent intent = new Intent();intent.setClass(this, MP4ParseAACActivity.class);startActivity(intent);}if (v.getId() == main_btn4.getId()) {Intent intent = new Intent();intent.setClass(this, MP4ParsePCMActivity.class);startActivity(intent);}if (v.getId() == main_btn5.getId()) {Intent intent = new Intent();intent.setClass(this, AudioPCMRenderActivity.class);startActivity(intent);}if (v.getId() == main_btn6.getId()) {Intent intent = new Intent();intent.setClass(this, CameraRenderActivity.class);startActivity(intent);}if (v.getId() == main_btn7.getId()) {Intent intent = new Intent();intent.setClass(this, SurfaceActivity.class);startActivity(intent);}if (v.getId() == main_btn8.getId()) {Intent intent = new Intent();intent.setClass(this, ByteBufferActivity.class);startActivity(intent);}if (v.getId() == inke_btn.getId()) {Intent intent = new Intent();intent.setClass(this, InkeMainActivity.class);startActivity(intent);}}@Overrideprotected void onDestroy() {//销毁super.onDestroy();}/*** 这个方法* A native method that is implemented by the 'mediajni' native library,* which is packaged with this application.*/public native String stringFromJNI();}

build.gradle 配置（app下面）


plugins {id 'com.android.application'
}android {compileSdk 32defaultConfig {applicationId "cn.com.codingce.mediaandroid"minSdk 21targetSdk 32versionCode 1versionName "1.0"testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"#加这个externalNativeBuild {cmake {cppFlags '-std=c++14'}}}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'}}compileOptions {sourceCompatibility JavaVersion.VERSION_1_8targetCompatibility JavaVersion.VERSION_1_8}#加这个externalNativeBuild {cmake {path file('src/main/cpp/CMakeLists.txt')version '3.10.2'}}#加这个buildFeatures {viewBinding true}
}dependencies {implementation 'androidx.appcompat:appcompat:1.4.1'implementation 'com.google.android.material:material:1.6.0'implementation 'androidx.constraintlayout:constraintlayout:2.1.4'testImplementation 'junit:junit:4.+'androidTestImplementation 'androidx.test.ext:junit:1.1.3'androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

ndk

ndk.dir=/Users/inke219223m/dev/android-ndk-r21e

当然你也可以根据新创建的项目摘出来

别忘了释放资源，有些资源需要自己手动释放，避免内存泄露，本例子仅作导入

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【音视频】JNI 引入Android项目

JNI 引入我的MediaAndroid项目

CMakeLists.txt文件

Native-lib.cpp

MainActivity

build.gradle 配置（app下面）

ndk

当然你也可以根据新创建的项目摘出来

【音视频】JNI 引入Android项目相关推荐

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