what are the vaariables and keywords of opencv and android in this program [closed]

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package org.opencv.samples.imagemanipulations;

import java.util.Arrays;

import org.opencv.android.BaseLoaderCallback; import org.opencv.android.LoaderCallbackInterface; import org.opencv.android.OpenCVLoader; import org.opencv.core.Core; import org.opencv.core.CvType; import org.opencv.core.Mat; import org.opencv.core.MatOfFloat; import org.opencv.core.MatOfInt; import org.opencv.core.Point; import org.opencv.core.Scalar; import org.opencv.core.Size; import org.opencv.android.CameraBridgeViewBase; import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener; import org.opencv.imgproc.Imgproc;

import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.WindowManager;

public class ImageManipulationsActivity extends Activity implements CvCameraViewListener { private static final String TAG = "OCVSample::Activity";

public static final int      VIEW_MODE_RGBA      = 0;
public static final int      VIEW_MODE_HIST      = 1;
public static final int      VIEW_MODE_CANNY     = 2;
public static final int      VIEW_MODE_SEPIA     = 3;
public static final int      VIEW_MODE_SOBEL     = 4;
public static final int      VIEW_MODE_ZOOM      = 5;
public static final int      VIEW_MODE_PIXELIZE  = 6;
public static final int      VIEW_MODE_POSTERIZE = 7;

private MenuItem             mItemPreviewRGBA;
private MenuItem             mItemPreviewHist;
private MenuItem             mItemPreviewCanny;
private MenuItem             mItemPreviewSepia;
private MenuItem             mItemPreviewSobel;
private MenuItem             mItemPreviewZoom;
private MenuItem             mItemPreviewPixelize;
private MenuItem             mItemPreviewPosterize;
private CameraBridgeViewBase mOpenCvCameraView;

private Size                 mSize0;
private Size                 mSizeRgba;
private Size                 mSizeRgbaInner;

private Mat                  mRgba;
private Mat                  mGray;
private Mat                  mIntermediateMat;
private Mat                  mHist;
private Mat                  mMat0;
private MatOfInt             mChannels[];
private MatOfInt             mHistSize;
private int                  mHistSizeNum;
private MatOfFloat           mRanges;
private Scalar               mColorsRGB[];
private Scalar               mColorsHue[];
private Scalar               mWhilte;
private Point                mP1;
private Point                mP2;
private float                mBuff[];
private Mat                  mRgbaInnerWindow;
private Mat                  mGrayInnerWindow;
private Mat                  mBlurWindow;
private Mat                  mZoomWindow;
private Mat                  mZoomCorner;
private Mat                  mSepiaKernel;

public static int           viewMode = VIEW_MODE_RGBA;

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();
            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

public ImageManipulationsActivity() {
    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.image_manipulations_surface_view);

    mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.image_manipulations_activity_surface_view);
    mOpenCvCameraView.setCvCameraViewListener(this);
}

@Override
public void onPause()
{
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
    super.onPause();
}

@Override
public void onResume()
{
    super.onResume();
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}

public void onDestroy() {
    super.onDestroy();
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    Log.i(TAG, "called onCreateOptionsMenu");
    mItemPreviewRGBA  = menu.add("Preview RGBA");
    mItemPreviewHist  = menu.add("Histograms");
    mItemPreviewCanny = menu.add("Canny");
    mItemPreviewSepia = menu.add("Sepia");
    mItemPreviewSobel = menu.add("Sobel");
    mItemPreviewZoom  = menu.add("Zoom");
    mItemPreviewPixelize  = menu.add("Pixelize");
    mItemPreviewPosterize = menu.add("Posterize");
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
    if (item == mItemPreviewRGBA)
        viewMode = VIEW_MODE_RGBA;
    if (item == mItemPreviewHist)
        viewMode = VIEW_MODE_HIST;
    else if (item == mItemPreviewCanny)
        viewMode = VIEW_MODE_CANNY;
    else if (item == mItemPreviewSepia)
        viewMode = VIEW_MODE_SEPIA;
    else if (item == mItemPreviewSobel)
        viewMode = VIEW_MODE_SOBEL;
    else if (item == mItemPreviewZoom)
        viewMode = VIEW_MODE_ZOOM;
    else if (item == mItemPreviewPixelize)
        viewMode = VIEW_MODE_PIXELIZE;
    else if (item == mItemPreviewPosterize)
        viewMode = VIEW_MODE_POSTERIZE;
    return true;
}

public void onCameraViewStarted(int width, int height) {
    mGray = new Mat ...