How Draw Line in Android
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You should override the onDraw method of your view.
screen_drawing_room.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/rlid" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <LinearLayout <!--set background for the bottom layout set image here. --> android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="bottom" android:orientation="vertical" android:weightSum="1.0" > <LinearLayout android:id="@+id/view_drawing_pad" <!--your drawing pad on foreground --> android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout> </LinearLayout> </RelativeLayout In your activities onCreate()
DrawingView mDrawingView=new DrawingView(this); setContentView(R.layout.screen_drawing_room); LinearLayout mDrawingPad=(LinearLayout)findViewById(R.id.view_drawing_pad); mDrawingPad.addView(mDrawingView); DrawingView.java
Define your DrawingView. The below can be used for freehand drawing. Modify the same to draw lines, texts and fill color( closed area). For flood Fill see the accepted answer in the link android using flood fill algorithm getting out of memory exception.
class DrawingView extends View { Paint mPaint; //MaskFilter mEmboss; //MaskFilter mBlur; Bitmap mBitmap; Canvas mCanvas; Path mPath; Paint mBitmapPaint; public DrawingView(Context context) { super(context); // TODO Auto-generated constructor stub mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(0xFFFF0000); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(20); mPath = new Path(); mBitmapPaint = new Paint(); mBitmapPaint.setColor(Color.RED); } @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 public void draw(Canvas canvas) { // TODO Auto-generated method stub super.draw(canvas); canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); canvas.drawPath(mPath, mPaint); } private float mX, mY; private static final float TOUCH_TOLERANCE = 4; private void touch_start(float x, float y) { //mPath.reset(); mPath.moveTo(x, y); mX = x; mY = y; } private void touch_move(float x, float y) { 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; } } private void touch_up() { mPath.lineTo(mX, mY); // commit the path to our offscreen mCanvas.drawPath(mPath, mPaint); //mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN)); // kill this so we don't double draw mPath.reset(); // mPath= new Path(); } @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: touch_start(x, y); invalidate(); break; case MotionEvent.ACTION_MOVE: touch_move(x, y); invalidate(); break; case MotionEvent.ACTION_UP: touch_up(); invalidate(); break; } return true; } } Your Drawing view is set. Study the fingerpaint.java from the sample on sdk under the graphics folder.
Resulting sanpshot. What you see in the background is a image. On the foreground I draw hi. I have draw lines to the corner. If you can make out it is red.
Draw lines which look like border. Set Stroke width for the paint to whatever you like. Similarly you can draw lines where you want by changing the x1,y1 and x2,y2 co-ordinates.
Display display = ( (Activity) mcontext).getWindowManager().getDefaultDisplay(); float w = display.getWidth(); float h = display.getHeight(); canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); canvas.drawLine(0, 0, w, 0,mBitmapPaint); canvas.drawLine(0, 0, 0, h,mBitmapPaint); canvas.drawLine(w,h,w,0,mBitmapPaint); canvas.drawLine(w, h, 0,h , mBitmapPaint); 
Edit:
To get image from gallery
File fp; Drawable d; public void setImagefrmGallery() { // To open up a gallery browser Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(Intent.createChooser(intent, "Select Picture"),1); // To handle when an image is selected from the browser, add the following to your Activity } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { if (requestCode == 1) { // currImageURI is the global variable Io?=m using to hold the content:// URI of the image Uri currImageURI = data.getData(); System.out.println("Hello======="+getRealPathFromURI(currImageURI)); String s= getRealPathFromURI(currImageURI); File file = new File(s); if (file.exists()) { fp=file.getAbsolutePath(); d = Drawable.createFromPath(file.getAbsolutePath()); mDrawingPad.setBackgroundDrawable(d); } else { System.out.println("File Not Found"); } } } } // And to convert the image URI to the direct file system path of the image file public String getRealPathFromURI(Uri contentUri) { // can post image String [] proj={MediaStore.Images.Media.DATA}; Cursor cursor = managedQuery( contentUri, proj, // Which columns to return null, // WHERE clause; which rows to return (all rows) null, // WHERE clause selection arguments (none) null); // Order-by clause (ascending by name) int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index); } Source: https://alltodev.com/how-to-draw-line-on-imageview-along-with-finger-in-android
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