Fix build for Android sample mobilenet-ssd detector.

samples/android/CMakeLists.txt

@@ -12,6 +12,7 @@ add_subdirectory(qr-detection)
 add_subdirectory(image-manipulations)
 add_subdirectory(camera-calibration)
 add_subdirectory(color-blob-detection)
+add_subdirectory(mobilenet-objdetect)
 add_subdirectory(tutorial-1-camerapreview)
 add_subdirectory(tutorial-2-mixedprocessing)
 add_subdirectory(tutorial-3-cameracontrol)

samples/android/mobilenet-objdetect/CMakeLists.txt

@@ -1,5 +1,25 @@
 set(sample example-mobilenet-objdetect)
 
+ocv_download(FILENAME "mobilenet_iter_73000.caffemodel"
+             HASH "bbcb3b6a0afe1ec89e1288096b5b8c66"
+             URL
+               "${OPENCV_MOBILENET_SSD_WEIGHTS_URL}"
+               "$ENV{OPENCV_MOBILENET_SSD_WEIGHTS_URL}"
+               "https://raw.githubusercontent.com/chuanqi305/MobileNet-SSD/97406996b1eee2d40eb0a00ae567cf41e23369f9/mobilenet_iter_73000.caffemodel"
+             DESTINATION_DIR "${CMAKE_CURRENT_LIST_DIR}/res/raw"
+             ID OPENCV_MOBILENET_SSD_WEIGHTS
+             STATUS res)
+
+ocv_download(FILENAME "deploy.prototxt"
+             HASH "f1978dc4fe20c680e850ce99830c5945"
+             URL
+               "${OPENCV_MOBILENET_SSD_CONFIG_URL}"
+               "$ENV{OPENCV_MOBILENET_SSD_CONFIG_URL}"
+               "https://raw.githubusercontent.com/chuanqi305/MobileNet-SSD/97406996b1eee2d40eb0a00ae567cf41e23369f9/deploy.prototxt"
+             DESTINATION_DIR "${CMAKE_CURRENT_LIST_DIR}/res/raw"
+             ID OPENCV_MOBILENET_SSD_CONFIG
+             STATUS res)
+
 add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS "${OPENCV_ANDROID_LIB_DIR}" SDK_TARGET 11 "${ANDROID_SDK_TARGET}")
 if(TARGET ${sample})
   add_dependencies(opencv_android_examples ${sample})

samples/android/mobilenet-objdetect/gradle/AndroidManifest.xml

@@ -1,15 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="org.opencv.samples.opencv_mobilenet"
+          package="org.opencv.samples.opencv_mobilenet">
->
 
     <application
-        android:allowBackup="true"
-        android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
-        android:roundIcon="@mipmap/ic_launcher_round"
+        android:icon="@drawable/icon">
-        android:supportsRtl="true"
+
-        android:theme="@style/Theme.AppCompat.NoActionBar">  <!--Full screen mode-->
         <activity
                   android:exported="true"
                   android:name=".MainActivity"

samples/android/mobilenet-objdetect/res/values/strings.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">opencv_mobilenet</string>
+    <string name="app_name">OCV Mobilenet Objdetect</string>
 </resources>

samples/android/mobilenet-objdetect/src/org/opencv/samples/opencv_mobilenet/MainActivity.java

@@ -3,15 +3,17 @@ package org.opencv.samples.opencv_mobilenet;
 import android.content.Context;
 import android.content.res.AssetManager;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
+import android.widget.Toast;
 
+import org.opencv.android.CameraActivity;
 import org.opencv.android.CameraBridgeViewBase;
 import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
 import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
 import org.opencv.android.OpenCVLoader;
 import org.opencv.core.Core;
 import org.opencv.core.Mat;
+import org.opencv.core.MatOfByte;
 import org.opencv.core.Point;
 import org.opencv.core.Scalar;
 import org.opencv.core.Size;
@@ -19,13 +21,12 @@ import org.opencv.dnn.Net;
 import org.opencv.dnn.Dnn;
 import org.opencv.imgproc.Imgproc;
 
-import java.io.BufferedInputStream;
+import java.io.InputStream;
-import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import android.widget.Toast;
+import java.util.Collections;
+import java.util.List;
 
-public class MainActivity extends AppCompatActivity implements CvCameraViewListener2 {
+public class MainActivity extends CameraActivity implements CvCameraViewListener2 {
 
     @Override
     public void onResume() {
@@ -46,6 +47,17 @@ public class MainActivity extends AppCompatActivity implements CvCameraViewListe
             return;
         }
 
+        mModelBuffer = loadFileFromResource(R.raw.mobilenet_iter_73000);
+        mConfigBuffer = loadFileFromResource(R.raw.deploy);
+        if (mModelBuffer == null || mConfigBuffer == null) {
+            Log.e(TAG, "Failed to load model from resources");
+        } else
+            Log.i(TAG, "Model files loaded successfully");
+
+
+        net = Dnn.readNet("caffe", mModelBuffer, mConfigBuffer);
+        Log.i(TAG, "Network loaded successfully");
+
         setContentView(R.layout.activity_main);
 
         // Set up camera listener.
@@ -54,12 +66,30 @@ public class MainActivity extends AppCompatActivity implements CvCameraViewListe
         mOpenCvCameraView.setCvCameraViewListener(this);
     }
 
+    @Override
+    public void onPause()
+    {
+        super.onPause();
+        if (mOpenCvCameraView != null)
+            mOpenCvCameraView.disableView();
+    }
+
+    @Override
+    protected List<? extends CameraBridgeViewBase> getCameraViewList() {
+        return Collections.singletonList(mOpenCvCameraView);
+    }
+
+    public void onDestroy() {
+        super.onDestroy();
+        if (mOpenCvCameraView != null)
+            mOpenCvCameraView.disableView();
+
+        mModelBuffer.release();
+        mConfigBuffer.release();
+    }
+
     // Load a network.
     public void onCameraViewStarted(int width, int height) {
-        String proto = getPath("MobileNetSSD_deploy.prototxt", this);
-        String weights = getPath("MobileNetSSD_deploy.caffemodel", this);
-        net = Dnn.readNetFromCaffe(proto, weights);
-        Log.i(TAG, "Network loaded successfully");
     }
 
     public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
@@ -71,6 +101,7 @@ public class MainActivity extends AppCompatActivity implements CvCameraViewListe
         final double THRESHOLD = 0.2;
 
         // Get a new frame
+        Log.d(TAG, "handle new frame!");
         Mat frame = inputFrame.rgba();
         Imgproc.cvtColor(frame, frame, Imgproc.COLOR_RGBA2RGB);
 
@@ -117,32 +148,27 @@ public class MainActivity extends AppCompatActivity implements CvCameraViewListe
 
     public void onCameraViewStopped() {}
 
-    // Upload file to storage and return a path.
+    private MatOfByte loadFileFromResource(int id) {
-    private static String getPath(String file, Context context) {
+       byte[] buffer;
-        AssetManager assetManager = context.getAssets();
-
-        BufferedInputStream inputStream = null;
         try {
-            // Read data from assets.
+            // load cascade file from application resources
-            inputStream = new BufferedInputStream(assetManager.open(file));
+            InputStream is = getResources().openRawResource(id);
-            byte[] data = new byte[inputStream.available()];
-            inputStream.read(data);
-            inputStream.close();
 
-            // Create copy file in storage.
+            int size = is.available();
-            File outFile = new File(context.getFilesDir(), file);
+            buffer = new byte[size];
-            FileOutputStream os = new FileOutputStream(outFile);
+            int bytesRead = is.read(buffer);
-            os.write(data);
+            is.close();
-            os.close();
+        } catch (IOException e) {
-            // Return a path to file which may be read in common way.
+            e.printStackTrace();
-            return outFile.getAbsolutePath();
+            Log.e(TAG, "Failed to ONNX model from resources! Exception thrown: " + e);
-        } catch (IOException ex) {
+            (Toast.makeText(this, "Failed to ONNX model from resources!", Toast.LENGTH_LONG)).show();
-            Log.i(TAG, "Failed to upload a file");
+            return null;
-        }
-        return "";
         }
 
-    private static final String TAG = "OpenCV/Sample/MobileNet";
+        return new MatOfByte(buffer);
+    }
+
+    private static final String TAG = "OpenCV-MobileNet";
     private static final String[] classNames = {"background",
             "aeroplane", "bicycle", "bird", "boat",
             "bottle", "bus", "car", "cat", "chair",
@@ -150,6 +176,8 @@ public class MainActivity extends AppCompatActivity implements CvCameraViewListe
             "motorbike", "person", "pottedplant",
             "sheep", "sofa", "train", "tvmonitor"};
 
+    private MatOfByte            mConfigBuffer;
+    private MatOfByte            mModelBuffer;
     private Net                  net;
     private CameraBridgeViewBase mOpenCvCameraView;
 }