Android tutorial updated. HelloWorld sample ported on new framework.
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mikle
Alexander Smorkalov
parent
6484732509
commit
7ef378b230
@ -270,105 +270,6 @@ It will be capable of accessing camera output, processing it and displaying the
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#. Set name, target, package and minSDKVersion accordingly.
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#. Create a new class (*File -> New -> Class*). Name it for example: *HelloOpenCVView*.
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.. image:: images/dev_OCV_new_class.png
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:alt: Add a new class.
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:align: center
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* It should extend *SurfaceView* class.
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* It also should implement *SurfaceHolder.Callback*, *Runnable*.
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#. Edit *HelloOpenCVView* class.
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* Add an *import* line for *android.content.context*.
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* Modify autogenerated stubs: *HelloOpenCVView*, *surfaceCreated*, *surfaceDestroyed* and *surfaceChanged*.
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.. code-block:: java
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:linenos:
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package com.hello.opencv.test;
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import android.content.Context;
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public class HelloOpenCVView extends SurfaceView implements Callback, Runnable {
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public HelloOpenCVView(Context context) {
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super(context);
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getHolder().addCallback(this);
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}
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public void surfaceCreated(SurfaceHolder holder) {
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(new Thread(this)).start();
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}
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public void surfaceDestroyed(SurfaceHolder holder) {
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cameraRelease();
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}
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public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
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cameraSetup(width, height);
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}
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//...
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* Add *cameraOpen*, *cameraRelease* and *cameraSetup* voids as shown below.
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* Also, don't forget to add the public void *run()* as follows:
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.. code-block:: java
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:linenos:
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public void run() {
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// TODO: loop { getFrame(), processFrame(), drawFrame() }
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}
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public boolean cameraOpen() {
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return false; //TODO: open camera
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}
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private void cameraRelease() {
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// TODO release camera
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}
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private void cameraSetup(int width, int height) {
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// TODO setup camera
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}
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#. Create a new *Activity* (*New -> Other -> Android -> Android Activity*) and name it, for example: *HelloOpenCVActivity*. For this activity define *onCreate*, *onResume* and *onPause* voids.
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.. code-block:: java
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:linenos:
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public void onCreate (Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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mView = new HelloOpenCVView(this);
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setContentView (mView);
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}
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protected void onPause() {
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super.onPause();
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mView.cameraRelease();
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}
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protected void onResume() {
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super.onResume();
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if( !mView.cameraOpen() ) {
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// MessageBox and exit app
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AlertDialog ad = new AlertDialog.Builder(this).create();
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ad.setCancelable(false); // This blocks the "BACK" button
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ad.setMessage("Fatal error: can't open camera!");
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ad.setButton("OK", new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog, int which) {
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dialog.dismiss();
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finish();
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}
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});
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ad.show();
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}
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}
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#. Add the following permissions to the AndroidManifest.xml file:
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.. code-block:: xml
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@ -386,98 +287,90 @@ It will be capable of accessing camera output, processing it and displaying the
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:alt: Reference OpenCV library.
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:align: center
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#. We now need some code to handle the camera. Update the *HelloOpenCVView* class as follows:
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#. Create new view layout for your application, lets name it hello_opencv.xml, and add the following to it:
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.. code-block:: xml
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:linenos:
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent" >
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<org.opencv.android.JavaCameraView
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:visibility="gone"
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android:id="@+id/java_surface_view" />
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</LinearLayout>
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#. Remove default auto generated layout, if exists.
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#. Create a new *Activity* (*New -> Other -> Android -> Android Activity*) and name it, for example: *HelloOpenCVActivity*. Add *CvCameraViewListener* interface to *implementes* section of *HelloOpenCVActivity* class. Add the following code to activity implementation:
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.. code-block:: java
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:linenos:
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private VideoCapture mCamera;
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public class Sample1Java extends Activity implements CvCameraViewListener {
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private CameraBridgeViewBase mOpenCvCameraView;
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public boolean cameraOpen() {
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synchronized (this) {
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cameraRelease();
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mCamera = new VideoCapture(Highgui.CV_CAP_ANDROID);
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if (!mCamera.isOpened()) {
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mCamera.release();
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mCamera = null;
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Log.e("HelloOpenCVView", "Failed to open native camera");
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return false;
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}
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}
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return true;
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}
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private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
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@Override
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public void onManagerConnected(int status) {
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switch (status) {
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case LoaderCallbackInterface.SUCCESS: {
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Log.i(TAG, "OpenCV loaded successfully");
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mOpenCvCameraView.enableView();
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} break;
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default:
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super.onManagerConnected(status);
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}
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}
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};
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public void cameraRelease() {
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synchronized(this) {
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if (mCamera != null) {
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mCamera.release();
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mCamera = null;
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}
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}
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}
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/** Called when the activity is first created. */
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@Override
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public void onCreate(Bundle savedInstanceState) {
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Log.i(TAG, "called onCreate");
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super.onCreate(savedInstanceState);
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
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setContentView(R.layout.hello_opencv);
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mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.java_surface_view);
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mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
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mOpenCvCameraView.setCvCameraViewListener(this);
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}
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private void cameraSetup(int width, int height) {
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synchronized (this) {
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if (mCamera != null && mCamera.isOpened()) {
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List<Size> sizes = mCamera.getSupportedPreviewSizes();
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int mFrameWidth = width;
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int mFrameHeight = height;
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{ // selecting optimal camera preview size
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double minDiff = Double.MAX_VALUE;
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for (Size size : sizes) {
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if (Math.abs(size.height - height) < minDiff) {
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mFrameWidth = (int) size.width;
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mFrameHeight = (int) size.height;
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minDiff = Math.abs(size.height - height);
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}
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}
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}
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mCamera.set(Highgui.CV_CAP_PROP_FRAME_WIDTH, mFrameWidth);
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mCamera.set(Highgui.CV_CAP_PROP_FRAME_HEIGHT, mFrameHeight);
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}
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}
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}
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@Override
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public void onPause()
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{
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if (mOpenCvCameraView != null)
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mOpenCvCameraView.disableView();
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super.onPause();
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}
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#. The last step would be to update the *run()* void in *HelloOpenCVView* class as follows:
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@Override
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public void onResume()
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{
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super.onResume();
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OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
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}
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.. code-block:: java
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:linenos:
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public void onDestroy() {
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super.onDestroy();
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if (mOpenCvCameraView != null)
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mOpenCvCameraView.disableView();
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}
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public void run() {
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while (true) {
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Bitmap bmp = null;
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synchronized (this) {
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if (mCamera == null)
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break;
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if (!mCamera.grab())
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break;
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public void onCameraViewStarted(int width, int height) {
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}
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bmp = processFrame(mCamera);
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}
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if (bmp != null) {
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Canvas canvas = getHolder().lockCanvas();
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if (canvas != null) {
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canvas.drawBitmap(bmp, (canvas.getWidth() - bmp.getWidth()) / 2,
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(canvas.getHeight() - bmp.getHeight()) / 2, null);
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getHolder().unlockCanvasAndPost(canvas);
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public void onCameraViewStopped() {
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}
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}
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bmp.recycle();
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}
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}
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}
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protected Bitmap processFrame(VideoCapture capture) {
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Mat mRgba = new Mat();
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capture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
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//process mRgba
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Bitmap bmp = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(), Bitmap.Config.ARGB_8888);
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try {
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Utils.matToBitmap(mRgba, bmp);
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} catch(Exception e) {
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Log.e("processFrame", "Utils.matToBitmap() throws an exception: " + e.getMessage());
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bmp.recycle();
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bmp = null;
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}
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return bmp;
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}
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public Mat onCameraFrame(Mat inputFrame) {
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return inputFrame;
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}
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}
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