[Android Studio] Using Java to call OpenCV
Environment: Android studio 2.2.3, OpenCV 2.4.9 For Android, Android 6 with api 23 for X86
一、File: build.gradle (app)
apply plugin: 'com.android.application' android { compileSdkVersion 23 buildToolsVersion "23.0.2" defaultConfig { applicationId "com.example.unsw.jeff" minSdkVersion 23 targetSdkVersion 23 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:23.1.1' testCompile 'junit:junit:4.12' compile project(':openCVLibrary249') }
二、File: build.gradle (openCVLibrary249)
apply plugin: 'com.android.library' android { compileSdkVersion 23 buildToolsVersion "23.0.2" defaultConfig { minSdkVersion 23 targetSdkVersion 23 } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt' } } }
三、模拟器(支持本地摄像头):
模拟器中app摄像头权限打开:
Set --> app --> 摄像头权限Open
显示效果:
开发代码
一、布局
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id ="@+id/activity_main" android:layout_width ="match_parent" android:layout_height="match_parent" tools:context="com.example.unsw.jeff.MainActivity"> <org.opencv.android.JavaCameraView android:layout_width ="wrap_content" android:layout_height="wrap_content" android:id="@+id/java_camera_view" /> </RelativeLayout>
二、功能实现核心:JavaCameraView
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
javaCameraView.setVisibility(SurfaceView.VISIBLE); javaCameraView.setCvCameraViewListener(this); // 因为MainActivity实现了接口:CameraBridgeViewBase.CvCameraViewListener2
}
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
@Override protected void onPause() { super.onPause(); if (javaCameraView != null) { javaCameraView.disableView(); } } @Override protected void onDestroy() { super.onDestroy(); if (javaCameraView != null) { javaCameraView.disableView(); } } @Override protected void onResume() { super.onResume(); if (OpenCVLoader.initDebug()) { Log.i(TAG, "OpenCV loaded successfully."); mLoaderCallBack.onManagerConnected(LoaderCallbackInterface.SUCCESS); } else { Log.i(TAG, "OpenCV not loaded."); OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, this, mLoaderCallBack); } }
@Override
public void onCameraViewStarted(int width, int height) {
mRgba = new Mat(height, width, CvType.CV_8UC4);
}
@Override
public void onCameraViewStopped() {
mRgba.release();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();
// By opencv api in java here, do what you want to do.
return mRgba;
}
补充:
OpenCV4Android开发实录(1):移植OpenCV3.3.0库到Android Studio