content: package org.opencv.samples.tutorial3;
  
  import java.text.SimpleDateFormat;
  import java.util.Collections;
  import java.util.Date;
  import java.util.List;
  import java.util.ListIterator;
  
  import org.opencv.android.BaseLoaderCallback;
  import org.opencv.android.CameraActivity;
  import org.opencv.android.CameraBridgeViewBase;
  import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
  import org.opencv.android.LoaderCallbackInterface;
  import org.opencv.android.OpenCVLoader;
  import org.opencv.core.Mat;
  import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
  
  import android.annotation.SuppressLint;
  import android.hardware.Camera.Size;
  import android.os.Bundle;
  import android.os.Environment;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.MotionEvent;
  import android.view.SubMenu;
  import android.view.SurfaceView;
  import android.view.View;
  import android.view.View.OnTouchListener;
  import android.view.WindowManager;
  import android.widget.Toast;
  
  public class Tutorial3Activity extends CameraActivity implements CvCameraViewListener2, OnTouchListener {
      private static final String TAG = "OCVSample::Activity";
  
      private Tutorial3View mOpenCvCameraView;
      private List<Size> mResolutionList;
      private Menu mMenu;
      private boolean mCameraStarted = false;
      private boolean mMenuItemsCreated = false;
      private MenuItem[] mEffectMenuItems;
      private SubMenu mColorEffectsMenu;
      private MenuItem[] mResolutionMenuItems;
      private SubMenu mResolutionMenu;
  
      private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
          @Override
          public void onManagerConnected(int status) {
              switch (status) {
                  case LoaderCallbackInterface.SUCCESS:
                  {
                      Log.i(TAG, "OpenCV loaded successfully");
                      mOpenCvCameraView.enableView();
                      mOpenCvCameraView.setOnTouchListener(Tutorial3Activity.this);
                  } break;
                  default:
                  {
                      super.onManagerConnected(status);
                  } break;
              }
          }
      };
  
      public Tutorial3Activity() {
          Log.i(TAG, "Instantiated new " + this.getClass());
      }
  
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          Log.i(TAG, "called onCreate");
          super.onCreate(savedInstanceState);
          getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  
          setContentView(R.layout.tutorial3_surface_view);
  
          mOpenCvCameraView = (Tutorial3View) findViewById(R.id.tutorial3_activity_java_surface_view);
  
          mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
  
          mOpenCvCameraView.setCvCameraViewListener(this);
      }
  
      @Override
      public void onPause()
      {
          super.onPause();
          if (mOpenCvCameraView != null)
              mOpenCvCameraView.disableView();
      }
  
      @Override
      public void onResume()
      {
          super.onResume();
          if (!OpenCVLoader.initDebug()) {
              Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
              OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
          } else {
              Log.d(TAG, "OpenCV library found inside package. Using it!");
              mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
          }
      }
  
      @Override
      protected List<? extends CameraBridgeViewBase> getCameraViewList() {
          return Collections.singletonList(mOpenCvCameraView);
      }
  
      public void onDestroy() {
          super.onDestroy();
          if (mOpenCvCameraView != null)
              mOpenCvCameraView.disableView();
      }
  
      @Override
      public void onCameraViewStarted(int width, int height) {
          mCameraStarted = true;
          setupMenuItems();
      }
  
      public void onCameraViewStopped() {
      }
  
      public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
          return inputFrame.rgba();
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          mMenu = menu;
          setupMenuItems();
          return true;
      }
  
      private void setupMenuItems() {
          if (mMenu == null || !mCameraStarted || mMenuItemsCreated) {
              return;
          }
          List<String> effects = mOpenCvCameraView.getEffectList();
  
          if (effects == null) {
              Log.e(TAG, "Color effects are not supported by device!");
              return;
          }
  
          mColorEffectsMenu = mMenu.addSubMenu("Color Effect");
          mEffectMenuItems = new MenuItem[effects.size()];
  
          int idx = 0;
          ListIterator<String> effectItr = effects.listIterator();
          for (String effect: effects) {
              mEffectMenuItems[idx] = mColorEffectsMenu.add(1, idx, Menu.NONE, effect);
              idx++;
          }
  
          mResolutionMenu = mMenu.addSubMenu("Resolution");
          mResolutionList = mOpenCvCameraView.getResolutionList();
          mResolutionMenuItems = new MenuItem[mResolutionList.size()];
  
          idx = 0;
          for (Size resolution: mResolutionList) {
              mResolutionMenuItems[idx] = mResolutionMenu.add(2, idx, Menu.NONE,
                      Integer.valueOf(resolution.width).toString() + "x" + Integer.valueOf(resolution.height).toString());
              idx++;
          }
          mMenuItemsCreated = true;
      }
  
      public boolean onOptionsItemSelected(MenuItem item) {
          Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
          if (item.getGroupId() == 1)
          {
              mOpenCvCameraView.setEffect((String) item.getTitle());
              Toast.makeText(this, mOpenCvCameraView.getEffect(), Toast.LENGTH_SHORT).show();
          }
          else if (item.getGroupId() == 2)
          {
              int id = item.getItemId();
              Size resolution = mResolutionList.get(id);
              mOpenCvCameraView.setResolution(resolution);
              resolution = mOpenCvCameraView.getResolution();
              String caption = Integer.valueOf(resolution.width).toString() + "x" + Integer.valueOf(resolution.height).toString();
              Toast.makeText(this, caption, Toast.LENGTH_SHORT).show();
          }
  
          return true;
      }
  
      @SuppressLint("SimpleDateFormat")
      @Override
      public boolean onTouch(View v, MotionEvent event) {
          Log.i(TAG,"onTouch event");
          SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
          String currentDateandTime = sdf.format(new Date());
          String fileName = Environment.getExternalStorageDirectory().getPath() +
                                 "/sample_picture_" + currentDateandTime + ".jpg";
          mOpenCvCameraView.takePicture(fileName);
          Toast.makeText(this, fileName + " saved", Toast.LENGTH_SHORT).show();
          return false;
      }
  }
  