I'm trying to draw a text on the center of a bitmap however I can't do it even though I used align.center. The code is:
public Bitmap drawTextToBitmap(Context gContext, String gText) {
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
Bitmap bitmap =
BitmapFactory.decodeResource(resources, R.drawable.blank_marker);
android.graphics.Bitmap.Config bitmapConfig =
bitmap.getConfig();
// set default bitmap config if none
if(bitmapConfig == null) {
bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
}
// resource bitmaps are imutable,
// so we need to convert it to mutable one
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
// new antialised Paint
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
// text color - #3D3D3D
paint.setColor(Color.rgb(61, 61, 61));
// text size in pixels
paint.setTextSize((int) (25 * scale));
// text shadow
paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);
// draw text to the Canvas center
Rect bounds = new Rect();
paint.setTextAlign(Align.CENTER);
paint.getTextBounds(gText, 0, gText.length(), bounds);
int x = (bitmap.getWidth() - bounds.width())/2;
int y = (bitmap.getHeight() + bounds.height())/2;
canvas.drawText(gText, x * scale, y * scale, paint);
return bitmap;
}
What am I doing wrong?
It's a lot more straightforward than you think.
Draw the text at half the Bitmap's width and height (center point) in combination with Paint.setTextAlign(Align.CENTER).
The alignment property will take care of the rest.
I guess none of the answers given above are good enough so I post my answer. Try it out guys, it will work on all devices and is not complex at all:
String text = "Text"; //your string
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(activity.getResources().getColor(R.color.white));
paint.setTextSize(30);
// draw text to the Canvas center
Rect boundsText = new Rect();
paint.getTextBounds(text, 0, text.length(), boundsText);
int x = (bitmap.getWidth() - boundsText.width()) / 2;
int y = (bitmap.getHeight() + boundsText.height()) / 2;
canvas.drawText(text, x, y, paint);
Where is the text drawing? The issue might be since you changed the text align to Align.CENTER. Your code calculating x and y assumes the text rendering is using Align.LEFT, I believe.
Either use setTextAlign(Align.CENTER) and render at the actual bitmap center, or use setTextAlign(Align.LEFT) and use the current x and y calculations you are using.
Related
When drawing the text though, it gets blurred and not that crisp like when using below code. The only code I've used for the text painting on image can some one help me to solve this issue
code
public static Bitmap drawMultilineTextToBitmap(Context gContext, Bitmap bitmap, String gText) {
// prepare canvas
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
//Bitmap bitmap = BitmapFactory.decodeResource(resources, gResId);
android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
// set default bitmap config if none
if (bitmapConfig == null) {
bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
}
// so we need to convert it to mutable one
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
TextPaint paint = new TextPaint(Paint.LINEAR_TEXT_FLAG|Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.FILL);
paint.setAntiAlias(true);
paint.setColor(Color.rgb(0, 0, 0));
paint.setFakeBoldText(true);
paint.setTextSize(10);
int textWidth = canvas.getWidth() - (int) (16 * scale);
// init StaticLayout for text
StaticLayout textLayout = new StaticLayout(gText, paint,
canvas.getWidth(), Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f,
false);
// get height of multiline text
int textHeight = textLayout.getHeight();
// get position of text's top left corner
float x = (bitmap.getWidth() - textWidth);
float y = (bitmap.getHeight() - textHeight);
// draw text to the Canvas Left
canvas.save();
//canvas.translate(x, y);
canvas.translate((canvas.getWidth() / 2) - (textLayout.getWidth() / 2), y);
textLayout.draw(canvas);
canvas.restore();
return bitmap;
}
image
I guess here:
paint.setAntiAlias(true);
should be false. And two more methods which may relate to this issue:
paint.setAntiAlias(false);
paint.setFilterBitmap(false);
paint.setDither(true);
I want to add background color for below staticLayout background color as transperentblock to appear text clearly can some one help me how can i achieve this
Code
public static Bitmap drawMultilineTextToBitmap(Context gContext, Bitmap bitmap, String gText) {
// prepare canvas
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
//Bitmap bitmap = BitmapFactory.decodeResource(resources, gResId);
android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
// set default bitmap config if none
if (bitmapConfig == null) {
bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
}
// so we need to convert it to mutable one
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
TextPaint paint = new TextPaint(Paint.LINEAR_TEXT_FLAG|Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.FILL);
paint.setAntiAlias(false);
paint.setFilterBitmap(false);
paint.setDither(true);
paint.setColor(Color.rgb(255, 255, 255));
paint.setFakeBoldText(true);
paint.setTextSize(8);
int textWidth = canvas.getWidth() - (int) (16 * scale);
// init StaticLayout for text
StaticLayout textLayout = new StaticLayout(gText, paint,
canvas.getWidth(), Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f,
false);
// get height of multiline text
int textHeight = textLayout.getHeight();
// get position of text's top left corner
float x = (bitmap.getWidth() - textWidth);
float y = (bitmap.getHeight() - textHeight);
// draw text to the Canvas Left
canvas.save();
//canvas.translate(x, y);
canvas.translate((canvas.getWidth() / 2) - (textLayout.getWidth() / 2), y);
textLayout.draw(canvas);
canvas.restore();
return bitmap;
}
public static int argb (int alpha,
int red,
int green,
int blue)
Return a color-int from alpha, red, green, blue components. These component values should be , but there is no range check performed, so if they are out of range, the returned color is undefined.
so use Color.argb(0,0,0,0)
Fully transparent - "#00000000"
I have an image in an imageView which i want to write some labels on it and then send it over social media or mail.
Is their any way to send the image with the text on top of it (Text overlay on image) ??
Thanks in advance
Try to draw text on bitmap following this
public Bitmap drawTextToBitmap(Context gContext,
int gResId,
String gText) {
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
Bitmap bitmap =
BitmapFactory.decodeResource(resources, gResId);
android.graphics.Bitmap.Config bitmapConfig =
bitmap.getConfig();
// set default bitmap config if none
if(bitmapConfig == null) {
bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
}
// resource bitmaps are imutable,
// so we need to convert it to mutable one
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
// new antialised Paint
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
// text color - #3D3D3D
paint.setColor(Color.rgb(61, 61, 61));
// text size in pixels
paint.setTextSize((int) (14 * scale));
// text shadow
paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);
// draw text to the Canvas center
Rect bounds = new Rect();
paint.getTextBounds(gText, 0, gText.length(), bounds);
int x = (bitmap.getWidth() - bounds.width())/2;
int y = (bitmap.getHeight() + bounds.height())/2;
canvas.drawText(gText, x, y, paint);
return bitmap;
}
Im quite new to Android so forgive me if I have missed something.
I've got the following code which displays a custom marker on maps. This custom marker also has some text on it. It works well up to the point where I want to resize the marker by a certain amount when the text is longer.
The code I originally had for the custom marker was,
private Bitmap drawTextToBitmap(final int mResId, final String mText) {
Resources resources = getResources();
// Get the screen's density scale
float scale = resources.getDisplayMetrics().density;
Bitmap bitmap = BitmapFactory.decodeResource(resources, mResId);
Bitmap.Config bitmapConfig = bitmap.getConfig();
if ( bitmapConfig == null ) {
bitmapConfig = Bitmap.Config.ARGB_8888;
}
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
// Set font color
paint.setColor(Color.WHITE);
// Set font size and scale it
paint.setTextSize((int) (14 * scale));
// Set shadow width
paint.setShadowLayer(1f, 0f, 1f, Color.BLACK);
// Set anti-aliasing
paint.setAntiAlias(true);
// Make font bold
paint.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.BOLD));
Rect bounds = new Rect();
paint.getTextBounds(mText, 0, mText.length(), bounds);
int x = (bitmap.getWidth() - bounds.width())/2;
int y = ((bitmap.getHeight() + bounds.height())/2)-25;
canvas.drawText(mText, x, y, paint);
return bitmap;
}
How can I resize this bitmap and also increase the font size accordingly without loosing any resolution ? Unfortunately I cant give screenshots due to licensing/permission issues.
Found the solution which was to add the following before creating the canvas.
int newWidth = (int) (origBitmap.getWidth() * scalingFactor);
int newHeight = (int) (origBitmap.getHeight() * scalingFactor);
Bitmap bitmap = Bitmap.createScaledBitmap(origBitmap, newWidth, newHeight, true);
This will scale the bitmap accordingly. I can similarly scale the font using the same scalingFactor.
Hi, genious!
What's the problem?
I tried to draw text in front of marker. I'm going to get clear bitmap and draw text but bitmap is still clear - where is the text?
I tried to convert View to bitmap but it's also wasn't good idea.
PS: scale >= 1
mMap.addMarker(new MarkerOptions()
.position(new LatLng(56.83789, 60.5986)) .icon(BitmapDescriptorFactory.fromBitmap(drawTextToBitmap(getApplicationContext(), R.drawable.ic_maps_marker,"19"))));
//here I'm trying to draw text bitmap
public static Bitmap drawTextToBitmap(Context gContext,int gResId,String gText) {
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
Bitmap bitmap =
BitmapFactory.decodeResource(resources, gResId);
android.graphics.Bitmap.Config bitmapConfig =
bitmap.getConfig();
if(bitmapConfig == null) {
bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
}
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.BLACK);
paint.setTextSize((int) (14 * scale));
paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);
Rect bounds = new Rect();
paint.getTextBounds(gText, 0, gText.length(), bounds);
int x = (bitmap.getWidth() - bounds.width())/2;
int y = (bitmap.getHeight() + bounds.height())/2;
canvas.drawText(gText, x * scale, y * scale, paint);
return bitmap;
}
Density was only necessary to determinate the size of the text. To draw text on canvas should not use scale, because of displacements x and y calculated for particular bitmap.
Try this:
canvas.drawText(gText, x, y, paint);
This work on 4 devices: