Develop Reference

Add Watermark To Image From URL And Share

I would like to add a watermark image (my logo) from my drawable before sharing it so that the image shared has a semi-transparent watermark.
So far I can only share an image from URL using a share intent with the code below:
public void shareItem(String url) {
Picasso.with(getApplicationContext()).load(url).into(new Target() {
#Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
shareIntent = new Intent(android.content.Intent.ACTION_SEND);
shareIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
shareIntent.putExtra(Intent.EXTRA_STREAM, getLocalBitmapUri(bitmap));
shareIntent.setType("image/png");
startActivity(Intent.createChooser(shareIntent, "Share with"));
}
#Override
public void onBitmapFailed(Drawable errorDrawable) {
}
#Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
});
}
public Uri getLocalBitmapUri(Bitmap bmp) {
Uri bmpUri = null;
try {
File file = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), "share_image_" + System.currentTimeMillis() + ".png");
FileOutputStream out = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
bmpUri = Uri.fromFile(file);
} catch (IOException e) {
e.printStackTrace();
}
return bmpUri;
}

you can use your uri as source in my code and create new uri for the output file(watermarked) to share via intent
Here is the calling code
String address = Environment.getExternalStorageDirectory().getAbsolutePath();
Bitmap source = BitmapFactory.decodeResource(getResources(), R.drawable.birds); // the original file is cuty.jpg i added in resources
Bitmap dest = addWatermark(source);
try {
dest.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File(address + "/output.jpg")));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
and this method will get the pretty job done.
public Bitmap addWatermark( Bitmap source) {
int width, height;
Canvas canvas;
Paint paint;
Bitmap bitmap, watermark;
Matrix matrix;
float scale;
RectF rectF;
width = source.getWidth();
height = source.getHeight();
// Create a new bitmap file and draw it on the canvas
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG | Paint.FILTER_BITMAP_FLAG);
canvas = new Canvas(bitmap);
canvas.drawBitmap(source, 0, 0, paint);
// now ready your watermark from the resources
watermark = BitmapFactory.decodeResource(getResources(), R.drawable.apple);
// scale / adjust height of your logo/watermark
// i am scaling it down to 30%
scale = (float) (((float) height * 0.30) / (float) watermark.getHeight());
// now create the matrix
matrix = new Matrix();
matrix.postScale(scale, scale);
// Determine the post-scaled size of the watermark
rectF = new RectF(0, 0, watermark.getWidth(), watermark.getHeight());
matrix.mapRect(rectF);
// below method will decide the position of the logo on the image
//for right bottom corner use below line
// matrix.postTranslate(width - rectF.width(), height - rectF.height());
// i am going to add it my logo at the top left corner
matrix.postTranslate(15,15);
// set alpha/opacity of paint which is going to draw watermark
paint.setAlpha(60);
// now draw the watermark on the canvas
canvas.drawBitmap(watermark, matrix, paint);
//cleaning up the memory
watermark.recycle();
// now return the watermarked image to the calling location
return bitmap;
}
here is the example image before
image after 60% alpha watermark applied at top left corner

Scan and recreate QR code on Android

Does anyone know of a way (preferably a single app) that could scan and recreate a QR code on Android?
Eg. I point my phone at the code, and then I could display that code on the screen, so it can be scanned again by some other device. This is different from simply taking a picture of the QR code since it takes me longer to get a nice photo of the code and even if I do, the quality is still quite bad and it takes too long to scan the code with the other device.

Try zxing library, https://github.com/zxing/zxing
1. Store string data after scan as a bitmap:
public static Bitmap encodeAsBitmap(final String contentAfterScan, final BarcodeFormat format,
final int width, final int height) throws WriterException {
MultiFormatWriter writer = new MultiFormatWriter();
EnumMap<EncodeHintType, Object> hint = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
hint.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = writer.encode(contentAfterScan, format, width, height, hint);
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = bitMatrix.get(x, y) ? 0xFF000000/*BLACK*/ : 0xFFFFFFFF/*WHITE*/;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
2. Store image into your folder
private void storeImageFromBitmap(Bitmap bitmap, String yourFolder, String imageName) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, bytes);
File f = new File(yourFolder + File.separator + imageName);
FileOutputStream fo;
try {
f.createNewFile();
fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
} catch (IOException e) {
e.printStackTrace();
}
}

the screenshot of Google Map V1

when I screen shot the map. I cannot success to shot the all screen.it only show the path.
I want to know what my problem is on my code. I hope someone can help me. thank you
It is my result:
// Screen shot
private static Bitmap takeScreenShot(Activity activity) {
// View to shot View
View view = activity.getWindow().getDecorView();
//View view = getPopupViews(getDecorViews())[0];
Log.i("ABC", view.getClass().getName());
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap b1 = view.getDrawingCache();
// the height
Rect frame = new Rect();
view.getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
System.out.println(statusBarHeight);
// width and height
int width = activity.getWindowManager().getDefaultDisplay().getWidth();
int height = activity.getWindowManager().getDefaultDisplay().getHeight();
// del the state bar
// Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455);
Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);
view.destroyDrawingCache();
return b;
}
// save image to sdcard
private static void savePic(Bitmap b, String strFileName) {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(strFileName);
if (null != fos) {
b.compress(Bitmap.CompressFormat.JPEG, 90, fos);
fos.flush();
fos.close();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void shoot() {
shoot(this);
}
// call function
public static void shoot(Activity a) {
savePic(takeScreenShot(a), "data/data/com.example.map/"+number+".png");
}

try this code, and pass mapView in this
public final static Bitmap takeScreenShot(View view) {
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
return bitmap;
}

private Bitmap getMapImage() {
MapController mc = mapView.getController();
mc.setCenter(GEO_POINT);
mc.setZoom(ZOOM_LEVEL);
/* Capture drawing cache as bitmap */
mapView.setDrawingCacheEnabled(true);
Bitmap bmp = Bitmap.createBitmap(mapView.getDrawingCache());
mapView.setDrawingCacheEnabled(false);
return bmp;
}
private void saveMapImage() {
String filename = "SCREEN_SHOT.png";
File f = new File(getExternalFilesDir(null), filename);
FileOutputStream out = new FileOutputStream(f);
Bitmap bmp = getMapImage();
bmp.compress(Bitmap.CompressFormat.PNG, 100, out);
out.close();
}

Merge two bitmaps in android

I want to merge two bitmaps, here is my code
// Camera arg conversion to Bitmap
Bitmap cameraBitmap = BitmapFactory.decodeByteArray(arg0, 0,
arg0.length);
Bitmap back = Bitmap.createBitmap(cameraBitmap.getWidth(),
cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas cam = new Canvas(back);
cam.drawBitmap(cameraBitmap, matrix, null);
// FrameLayout to Bitmap
FrameLayout mainLayout = (FrameLayout) findViewById(R.id.frame);
Bitmap foreground = Bitmap.createBitmap(mainLayout.getWidth(),
mainLayout.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(foreground);
mainLayout.draw(c);
Bitmap cs = null;
cs = Bitmap.createBitmap(foreground.getWidth(), cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas comboImage = new Canvas(cs);
comboImage.drawBitmap(cameraBitmap, 0f, 0f, null);
comboImage.drawBitmap(foreground, 0f, cameraBitmap.getHeight(), null);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
if (fos != null) {
cs.compress(Bitmap.CompressFormat.PNG, 90, fos);
fos.close();
}
} catch (Exception e) {
e.printStackTrace();
}
The camera image should become background, and foreground as top image. I've tried from
Combining 2 Images in Android using Canvas but it didn't help me. Any idea.? Thanks

From your example, you forgot to add the next lines:
comboImage.drawBitmap(c, 0f, 0f, null);
comboImage.drawBitmap(s, 0f, c.getHeight(), null);
In your example above you don't draw your image in the canvas, and that is the problem.
You can think that your canvas i your sketchbook. For now you didn't paint anything, and you ask yourself, way I can't see any colors.
So, for my advice, first create the two bitmaps, then, do the next thing:
c.drawBitmap(cameraBitmap, top point, left point, null);
c.drawBitmap(foreground, top point, left point, null);
You can also do this by first create the drawable objects from your bitmaps, like in the next code:
Drawable cameraBitmap = BitmapDrawable(cameraBitmap);
Drawable foreground= BitmapDrawable(foreground);
Then when you have the drawable objects, you can set thier bounds, and that way you set where do you want to show that image.
cameraBitmap.setBounds(left, top, right, bottom);
foreground.setBounds(left, top, right, bottom);
and finally draw that on the canvas:
cameraBitmap.draw(canvas);
foreground.draw(canvas);
EDIT:
This is an example, use this to understand your implementation:
Bitmap bitmap = null;
try {
bitmap = Bitmap.createBitmap(500, 500, Config.ARGB_8888);
Canvas c = new Canvas(bitmap);
Resources res = getResources();
Bitmap bitmap1 = BitmapFactory.decodeResource(res, R.drawable.test1); //blue
Bitmap bitmap2 = BitmapFactory.decodeResource(res, R.drawable.test2); //green
Drawable drawable1 = new BitmapDrawable(bitmap1);
Drawable drawable2 = new BitmapDrawable(bitmap2);
drawable1.setBounds(100, 100, 400, 400);
drawable2.setBounds(150, 150, 350, 350);
drawable1.draw(c);
drawable2.draw(c);
} catch (Exception e) {
}
return bitmap;
This is what I get from the code above:

Merging Two Bitmap vertically when one is large and second is small
follow this method
public Bitmap finalcombieimage(Bitmap c, Bitmap s) {
Bitmap cs = null;
DisplayMetrics metrics = getBaseContext().getResources().getDisplayMetrics();
int width = metrics.widthPixels;
int height = metrics.heightPixels;
cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas comboImage = new Canvas(cs);
Rect dest1 = new Rect(0, 0, width, height); // left,top,right,bottom
comboImage.drawBitmap(c, null, dest1, null);
Rect dest2 = new Rect(0, height-400 / 2, width, height);
comboImage.drawBitmap(s, null, dest2, null);
return cs;
}

Please note that the BitmapDrawable(Bitmap) has been deprecated. Kinldy check this for the alternative.
BitmapDrawable(Bitmap bitmap)
This constructor was deprecated in API level 4. Use BitmapDrawable(Resources, Bitmap) to ensure that the drawable has correctly set its target density.

Resize watermark image same size as original image
Uri bmpUri1 = getLocalBitmapUri(ivImage);
Uri bmpUri2 = getLocalBitmapUri(watermark_imageview);
try {
bm1 = BitmapFactory.decodeStream(
getContentResolver().openInputStream(bmpUri1));
bm2 = BitmapFactory.decodeStream(
getContentResolver().openInputStream(bmpUri2));
Bitmap bmOverlay = Bitmap.createBitmap(bm1.getWidth(), bm1.getHeight(), bm1.getConfig());
bm2 = Bitmap.createScaledBitmap(bm2, bm1.getWidth(), bm1.getHeight(),
true);
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(bm1, 0,0, null);
canvas.drawBitmap(bm2, 0,0, null);
watermarkimage.setVisibility(View.GONE);
im =new ImageView(ImageClick.this);
im.setImageBitmap(bmOverlay);
bmpUri = getLocalBitmapUri(im);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
private Uri getLocalBitmapUri(ImageView imageView) {
Drawable drawable = imageView.getDrawable();
Bitmap bmp = null;
if (drawable instanceof BitmapDrawable){
bmp = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
} else {
return null;
}
// Store image to default external storage directory
Uri bmpUri = null;
try {
File file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS), "share_image_" + System.currentTimeMillis() + ".png");
file.getParentFile().mkdirs();
FileOutputStream out = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
bmpUri = Uri.fromFile(file);
} catch (IOException e) {
e.printStackTrace();
}
return bmpUri;
}

Make image as canvas background and save it with user's drawing

I'm using the code below. My app was able to draw on the canvas and save it.
But what I want to do is make an image as the background of the canvas so when I save it, it will look like an image with the user's drawing on top of it.
Thank you so much for any help! :)
#Override
public void run() {
Canvas canvas = null;
while (_run){
if(isDrawing == true){
try{
canvas = mSurfaceHolder.lockCanvas(null);
if(mBitmap == null){
mBitmap = Bitmap.createBitmap (1, 1, Bitmap.Config.ARGB_8888);
}
final Canvas c = new Canvas (mBitmap);
c.drawColor(0, PorterDuff.Mode.CLEAR);
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
canvas.drawColor(0xffffffff);
commandManager.executeAll(c,previewDoneHandler);
previewPath.draw(c);
canvas.drawBitmap (mBitmap, 0, 0,null);
} finally {
mSurfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
}

Try this stuff,
This will return a Bitmap that will be a Merged one of two Bitmap Images, also it will save in the SDCard.
public Bitmap combineImages(Bitmap c, Bitmap s) {
Bitmap cs = null;
int width, height = 0;
if (c.getWidth() > s.getWidth()) {
width = c.getWidth();
height = c.getHeight();
} else {
width = s.getWidth() + s.getWidth();
height = c.getHeight();
}
cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas comboImage = new Canvas(cs);
comboImage.drawBitmap(c, 0, 0, null);
comboImage.drawBitmap(s, 100, 300, null);
/******
*
* Write file to SDCard
*
* ****/
String tmpImg = String.valueOf(System.currentTimeMillis()) + ".png";
OutputStream os = null;
try {
os = new FileOutputStream(Environment.getExternalStorageDirectory()
+ "/"+tmpImg);
cs.compress(CompressFormat.PNG, 100, os);
} catch (IOException e) {
Log.e("combineImages", "problem combining images", e);
}
return cs;
}

For any view that you are creating, you can create a bitmap of what it is currently displaying.
use:
view.setDrawingCacheEnabled(true);
Bitmap bitmap=view.getDrawingCache();
Does this help you in achieving what you want ?
*be sure to recycle these bitmaps when you are done.
bitmap.recycle();