DrawingView with share image in Sketchware Pro

1. This example shows how to create a DrawingView in Sketchware.

2. Create a new project in Sketchware.

3. Switch On AppCompat and design.

4. In View manager, deselect toolbar for main.xml.

5. In java/Kotlin manager:

a. Add a file DrawingView.java and put following codes in it.


package com.sanju.drawingview;

import android.view.View;
import android.graphics.Bitmap;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Canvas;
import android.content.Context;
import android.util.AttributeSet;
import android.graphics.Color;
import android.view.MotionEvent;
import android.graphics.PorterDuff;

import java.util.ArrayList;

public class DrawingView extends View {

    private Bitmap mBitmap;
    private Canvas mCanvas;
    private Paint mBitmapPaint;
    private Paint mPaint;
    private Paint circlePaint;
    private Path circlePath;
    private Path mPath;

    private float mX, mY;
    private static final float TOUCH_TOLERANCE = 4;

    private ArrayList<PathPaint> all_paths = new ArrayList<>();

    public DrawingView(Context context) {
        super(context);
        init();
    }

    public DrawingView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        mPath = new Path();

        mBitmapPaint = new Paint(Paint.DITHER_FLAG);

        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(Color.BLACK);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(6f);

        circlePath = new Path();
        circlePaint = new Paint();
        circlePaint.setAntiAlias(true);
        circlePaint.setColor(Color.BLUE);
        circlePaint.setStyle(Paint.Style.STROKE);
        circlePaint.setStrokeWidth(1f);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
        canvas.drawPath(mPath, mPaint);
        canvas.drawPath(circlePath, circlePaint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        float x = event.getX();
        float y = event.getY();

        switch (event.getAction()) {

            case MotionEvent.ACTION_DOWN:
                mPath.reset();
                mPath.moveTo(x, y);
                mX = x;
                mY = y;
                invalidate();
                break;

            case MotionEvent.ACTION_MOVE:
                float dx = Math.abs(x - mX);
                float dy = Math.abs(y - mY);

                if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
                    mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
                    mX = x;
                    mY = y;

                    circlePath.reset();
                    circlePath.addCircle(mX, mY, 30, Path.Direction.CW);
                }
                invalidate();
                break;

            case MotionEvent.ACTION_UP:
                mPath.lineTo(mX, mY);
                circlePath.reset();

                Path p = new Path(mPath);
                Paint pnt = new Paint(mPaint);
                all_paths.add(new PathPaint(p, pnt));

                mCanvas.drawPath(mPath, mPaint);
                mPath.reset();
                invalidate();
                break;
        }
        return true;
    }

    public void undo() {
        if (all_paths.size() > 0) {
            all_paths.remove(all_paths.size() - 1);
        }

        mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);

        for (PathPaint pp : all_paths) {
            mCanvas.drawPath(pp.getPath(), pp.getPaint());
        }
        invalidate();
    }
    
    // Clear all drawings
public void clear() {
    all_paths.clear();
    mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
    invalidate();
}

// Set stroke width
public void setStrokeWidth(float width) {
    mPaint.setStrokeWidth(width);
}

// Set stroke color
public void setStrokeColor(int color) {
    mPaint.setColor(color);
}


}

b. Add another file PathPaint.java and put following codes in it.


package com.sanju.drawingview;

import android.graphics.Paint;
import android.graphics.Path;

public class PathPaint {

    private Path path;
    private Paint paint;

    public PathPaint(Path path, Paint paint) {
        this.path = path;
        this.paint = paint;
    }

    public Path getPath() {
        return path;
    }

    public Paint getPaint() {
        return paint;
    }
}

c. Add another file SaveUtils.java and put following codes in it.


package com.sanju.drawingview;

import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.view.View;
import android.widget.Toast;

import androidx.core.content.FileProvider;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public final class SaveUtils {

    private SaveUtils() {
        // Utility class
    }

    /**
     * Converts a View into a Bitmap
     */
    public static Bitmap viewToBitmap(View view) {
        Bitmap bitmap = Bitmap.createBitmap(
                view.getWidth(),
                view.getHeight(),
                Bitmap.Config.ARGB_8888
        );

        Canvas canvas = new Canvas(bitmap);
        Drawable background = view.getBackground();

        if (background != null) {
            background.draw(canvas);
        } else {
            canvas.drawColor(Color.WHITE);
        }

        view.draw(canvas);
        return bitmap;
    }

    /**
     * Saves bitmap to internal storage
     */
    public static File saveBitmap(Context context, Bitmap bitmap) {
        if (context == null || bitmap == null) return null;

        File imageFile = new File(context.getFilesDir(), "temp_drawing.png");

        try (FileOutputStream fos = new FileOutputStream(imageFile)) {
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
            fos.flush();
            return imageFile;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        } finally {
            if (!bitmap.isRecycled()) {
                bitmap.recycle();
            }
        }
    }

    /**
     * Shares image using FileProvider
     */
    public static void shareImage(Context context, File imageFile) {
        if (context == null || imageFile == null || !imageFile.exists()) return;

        try {
            Uri imageUri = FileProvider.getUriForFile(
                    context,
                    context.getPackageName() + ".provider",
                    imageFile
            );

            Intent shareIntent = new Intent(Intent.ACTION_SEND);
            shareIntent.setType("image/*");
            shareIntent.putExtra(Intent.EXTRA_STREAM, imageUri);
            shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

            context.startActivity(
                    Intent.createChooser(shareIntent, "Share image via")
            );

        } catch (IllegalArgumentException e) {
            Toast.makeText(context,
                    "FileProvider error: " + e.getMessage(),
                    Toast.LENGTH_SHORT).show();
        } catch (ActivityNotFoundException e) {
            Toast.makeText(context,
                    "No app available to share image",
                    Toast.LENGTH_SHORT).show();
        }
    }
}

6. In main.xml, add a Linear Horizontal containing 6 ImageViews image_strokecolor, image_strokewidth, image_background, image_undo, image_delete, image_download.

Below this, add a Linear Vertical with width and height match_parent. Convert it to com.sanju.drawingview.DrawingView (Replace com.sanju.drawingview with your package name). Also change its ID to drawingView.


7. In AndroidManifest manager, in App Components, put following codes:


<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">

    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

8. In Resource manager, create a folder xml and inside this create a file file_paths.xml. Put following codes in it.


<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path
        name="internal_files"
        path="." />
</paths>

9. Create a more block, showStrokeWidthDialog and put following codes in it.


String[] sizes = {"4", "8", "12", "16", "20"};
        new AlertDialog.Builder(this)
                .setTitle("Select Stroke Width")
                .setItems(sizes, (d, i) ->
                        binding.drawingView.setStrokeWidth(Float.parseFloat(sizes[i])))
                .show();

10. In event image_strokewidth onClick, use the more block showStrokeWidthDialog.

11. Create another more block showStrokeColorDialog and put following codes in it.


        int[] colors = {
                Color.BLACK, Color.RED, Color.BLUE,
                Color.GREEN, Color.YELLOW
        };
        String[] names = {"Black", "Red", "Blue", "Green", "Yellow"};

        new AlertDialog.Builder(this)
                .setTitle("Select Stroke Color")
                .setItems(names, (d, i) ->
                        binding.drawingView.setStrokeColor(colors[i]))
                .show();

12. In event image_strokecolor onClick, use the more block showStrokeColorDialog.

13. Create a more block, showBackgroundColorDialog and put following codes in it.


int[] colors = {
    Color.WHITE, Color.LTGRAY,
    Color.YELLOW, Color.CYAN
};
String[] names = {"White", "Gray", "Yellow", "Cyan"};

new AlertDialog.Builder(this)
    .setTitle("Select Background Color")
    .setItems(names, (d, i) ->
            binding.drawingView.setBackgroundColor(colors[i]))
    .show();

14. In event image_background onClick, use the more block showBackgroundColorDialog.

15. In the event image_undo onClick, use following codes.


binding.drawingView.undo();

16. In the event image_delete onClick, use following codes.


binding.drawingView.clear();

17. In the event image_download onClick, use following codes.


Bitmap bitmap = SaveUtils.viewToBitmap(binding.drawingView);

File savedImage = SaveUtils.saveBitmap(getApplicationContext(), bitmap);

SaveUtils.shareImage(MainActivity.this, savedImage);

18. In Build Settings, select D8 and java version 1.8 and save.

19. Run the project.


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