I am creating an app and want my ui to scale with the phone. I am importing bitmaps into a canvas and drawing them as follows:
public class MainMenu extends View {
private RectF titleBounds, playBounds, scoreBounds, soundBounds, creditBounds;
private Paint titlePaint, playPaint;
private boolean playClick = false, startPlay = false, scoreClick = false, startScore = false, soundClick = false, startSound = false, creditsClick = false, startCredits = false;
public Bitmap play;
public Bitmap playGlow;
public Bitmap sound;
public Bitmap soundGlow;
public int screenWidth, screenHeight;
public MainMenu(Context context) {
super(context);
titleBounds = new RectF();
playBounds = new RectF();
scoreBounds = new RectF();
soundBounds = new RectF();
creditBounds = new RectF();
titlePaint = new Paint();
playPaint = new Paint();
play = BitmapFactory.decodeResource(getResources(), R.drawable.play);
playGlow = BitmapFactory.decodeResource(getResources(), R.drawable.playglow);
sound = BitmapFactory.decodeResource(getResources(), R.drawable.sound);
soundGlow = BitmapFactory.decodeResource(getResources(), R.drawable.soundglow);
// Get window size and save it to screenWidth and screenHeight.
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
screenHeight = size.y;
}
#Override protected void onDraw(Canvas canvas) {
ViewGroup parent = (ViewGroup)getParent();
playBounds.set(screenWidth / 2 - play.getWidth() / 2, screenHeight * 1/3 - play.getHeight() / 2, playBounds.left + play.getWidth(), playBounds.top + play.getHeight());
soundBounds.set(scoreBounds.centerX() - sound.getWidth() / 2, scoreBounds.bottom + 10, soundBounds.left + sound.getWidth(), soundBounds.top + sound.getHeight());
The problem is theres nothing to scale the image to fit the phone, it just reads the x and y size of the image I import. What method is there for scaling images?
Use the createScaledBitmap of the Bitmap class
bitmap = Bitmap.createScaledBitmap(bitmap, scaledWidth, scaledHeight, true);
It will scale your bitmap but not greater than the width and height that is because it can cause blurriness to your bitmap.
documentation:
Creates a new bitmap, scaled from an existing bitmap, when possible.
If the specified width and height are the same as the current width and height of the source bitmap,
the source bitmap is returned and no new bitmap is created.
for full screen
bitmap = Bitmap.createScaledBitmap(bitmap, screenWidth , screenHeight , true);
Related
I'm making an app that can freehand crop a picture using a canvas in android studio. My problem is that after cropping the picture, the cropped part stays in the same exact position as it was originally, whereas i want it to get centered and enlargened. Is there any way to take the non-transparent part and center it, or maybe remove the transparent part all-together?
Screenshot of my app where i want the banana to be centered
https://i.stack.imgur.com/8OKNT.png
Bitmap bitmap;
Path path = new Path();
Paint paint;
int width;
int height;
Rect src;
Rect dest;
public CutImage(Context context, Bitmap bitmap2) {
super(context);
bitmap = bitmap2;
paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.RED);
paint.setStrokeWidth(5f);
width = getWindowManager().getDefaultDisplay().getWidth();
height = getWindowManager().getDefaultDisplay().getHeight();
src = new Rect(0, 0, bitmap.getWidth() - 1, bitmap.getHeight() - 1);
dest = new Rect(0, 0, width - 1, height - 1);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.getHeight();
canvas.drawBitmap(bitmap,src,dest, null);
canvas.drawPath(path, paint);
}
private void crop() {
Bitmap croppedBitmap =
Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(),bitmap.getConfig());
Canvas cropCanvas = new Canvas(croppedBitmap);
Paint paint = new Paint();
cropCanvas.drawPath(path,paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
cropCanvas.drawBitmap(bitmap,src,dest,paint);
bitmap = croppedBitmap;
showImage2(bitmap);
}
} ```
I am trying to build a simple game on android and while setting the background image and other image assets on my main screen it is appearing too big as shown in the below image.
The actual size of the image is 1920x1080 and I want it to fit my screen like the image shown below:
The code for I have used is:
public class PoliceView extends View {
private Bitmap police;
private Bitmap background;
private Paint scorePaint = new Paint();
private Bitmap life[] = new Bitmap[2];
public PoliceView(Context context) {
super(context);
police = BitmapFactory.decodeResource(getResources(),R.drawable.police);
background = BitmapFactory.decodeResource(getResources(),R.drawable.gamebackground);
scorePaint.setColor(Color.BLACK);
scorePaint.setTextSize(70);
scorePaint.setTypeface(Typeface.DEFAULT_BOLD);
scorePaint.setAntiAlias(true);
life[0] = BitmapFactory.decodeResource(getResources(),R.drawable.heart);
life[1] = BitmapFactory.decodeResource(getResources(),R.drawable.brokenheart);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//The order of draw matters as objects are drawn in this same order
canvas.drawBitmap(background,0,0,null);
canvas.drawBitmap(police, 0, 0, null);
canvas.drawText("Score:",20, 60, scorePaint);
//Three lives for the police
canvas.drawBitmap(life[0],580, 10, null);
canvas.drawBitmap(life[0],680, 10, null);
canvas.drawBitmap(life[0],780, 10, null);
}}
How can I resize the images to fit the screen??
i use this code for resize image
Bitmap tmp = BitmapFactory.decodeFile(mPath);
ResizeWidth = (int) (your size);
ResizeHeight = (int) (your size);
Bitmap bitmap = Bitmap.createBitmap(ResizeWidth, ResizeHeight, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Bitmap scaled = Bitmap.createScaledBitmap(tmp, ResizeWidth, ResizeHeight, true);
int leftOffset = 0;
int topOffset = 0;
canvas.drawBitmap(scaled, leftOffset, topOffset, null);
How to resize bitmap in canvas?
canvas.save(); // Save current canvas params (not only scale)
canvas.scale(scaleX, scaleY);
canvas.restore(); // Restore current canvas params
scale = 1.0f will draw the same visible size bitmap
i googled coverflow code i found one useful and work great to me (im not professional in android development ), what i need it.
when click on each image it will stream predetermined mp3 song for each image and another click will stop it ,
so each image will have different mp3 song which all mp3 songs stored in app it self .
public class CoverFlowExample extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CoverFlow coverFlow;
coverFlow = new CoverFlow(this);
coverFlow.setAdapter(new ImageAdapter(this));
ImageAdapter coverImageAdapter = new ImageAdapter(this);
//coverImageAdapter.createReflectedImages();
coverFlow.setAdapter(coverImageAdapter);
coverFlow.setSpacing(-25);
coverFlow.setSelection(4, true);
coverFlow.setAnimationDuration(1000);
setContentView(coverFlow);
}
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;
private FileInputStream fis;
private Integer[] mImageIds = {
R.drawable.aa,
R.drawable.aab,
R.drawable.aabb,
R.drawable.aabbb,
R.drawable.aac,
};
private ImageView[] mImages;
public ImageAdapter(Context c) {
mContext = c;
mImages = new ImageView[mImageIds.length];
}
public boolean createReflectedImages() {
//The gap we want between the reflection and the original image
final int reflectionGap = 4;
int index = 0;
for (int imageId : mImageIds) {
Bitmap originalImage = BitmapFactory.decodeResource(getResources(),
imageId);
int width = originalImage.getWidth();
int height = originalImage.getHeight();
//This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
//Create a Bitmap with the flip matrix applied to it.
//We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2,
width, height/2, matrix, false);
//Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width
, (height + height/2), Config.ARGB_8888);
//Create a new Canvas with the bitmap that's big enough for
//the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
//Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
//Draw in the gap
Paint deafaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
//Draw in the reflection
canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);
//Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
//Set the paint to use this shader (linear gradient)
paint.setShader(shader);
//Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
//Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width,
bitmapWithReflection.getHeight() + reflectionGap, paint);
ImageView imageView = new ImageView(mContext);
imageView.setImageBitmap(bitmapWithReflection);
imageView.setLayoutParams(new CoverFlow.LayoutParams(120, 180));
imageView.setScaleType(ScaleType.MATRIX);
mImages[index++] = imageView;
}
return true;
}
public int getCount() {
return mImageIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
//Use this code if you want to load from resources
ImageView i = new ImageView(mContext);
i.setImageResource(mImageIds[position]);
i.setLayoutParams(new CoverFlow.LayoutParams(430, 430));
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
return i;
//return mImages[position];
}
/** Returns the size (0.0f to 1.0f) of the views
* depending on the 'offset' to the center. */
public float getScale(boolean focused, int offset) {
/* Formula: 1 / (2 ^ offset) */
return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset)));
}
}
}
I'd like to create a Bitmap from a String with a given text size and set it as source of an ImageView.
The ImageView in it's layout xml:
<ImageView
android:id="#+id/myImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"/>
Setting the Bitmap as src of the ImageView:
myImageView.setImageBitmap(getBitmapFromString("StringToDraw", 30));
My getBitmapFromString method:
private Bitmap getBitmapFromString(String string, float textSize) {
Bitmap bitmap = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
paint.setTextSize(textSize);
paint.setTextAlign(Paint.Align.LEFT);
canvas.drawText(string, 0, 100, paint);
return bitmap;
}
How can i calculate the proper size for the Bitmap (from the given text size and String length) and how can i make it to fit the ImageView properly?
Found the solution in the following answer to a similar question:
https://stackoverflow.com/a/15252876/3363481
My code looks like this now:
private Bitmap getBitmapFromString(String text, float fontSizeSP, Context context) {
int fontSizePX = convertDiptoPix(context, fontSizeSP);
int pad = (fontSizePX / 9);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setTextSize(fontSizePX);
int textWidth = (int) (paint.measureText(text) + pad * 2);
int height = (int) (fontSizePX / 0.75);
Bitmap bitmap = Bitmap.createBitmap(textWidth, height, Bitmap.Config.ARGB_4444);
Canvas canvas = new Canvas(bitmap);
float xOriginal = pad;
canvas.drawText(text, xOriginal, fontSizePX, paint);
return bitmap;
}
So far, my image starts at 0,0 and scales properly. There is a black bar under it. How can I align it so that it is centered along the y, with a black bar above and below the image?
edit: also, what are "this.getWidth(), this.getHeight()" referring to when I make the object "dest" - the width of mBitmap? The documentation does say they represent the width of the view, I just want to make sure I'm correct in thinking that is it mBitmap.
public class SpotGameActivity extends Activity {
private Bitmap mBitmap;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dpi2b);
setContentView(new BitMapView(this, mBitmap));
}
class BitMapView extends View {
Bitmap mBitmap = null;
public BitMapView(Context context, Bitmap bm) {
super(context);
mBitmap = bm;
}
#Override
protected void onDraw(Canvas canvas) {
//DisplayMetrics metrics = new DisplayMetrics();
//getWindowManager().getDefaultDisplay().getMetrics(metrics);
// called when view is drawn
Paint paint = new Paint();
paint.setFilterBitmap(true);
// The image will be scaled so it will fill the width, and the
// height will preserve the image’s aspect ration
float aspectRatio = ((float) mBitmap.getWidth()) / mBitmap.getHeight();
Rect dest = new Rect(0, 0, this.getWidth(),(int) (this.getWidth() / aspectRatio));
String AR = Double.toString(aspectRatio);
canvas.drawBitmap(mBitmap, null, dest, paint);
Toast.makeText(SpotGameActivity.this, AR, Toast.LENGTH_SHORT).show();
}
I've now gotten the difference between the view size and image size. I've divided the difference by 2 but now, my image is align to the bottom of the screen rather than the middle of the y-axis. any tips?:
#Override
protected void onDraw(Canvas canvas) {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int scrHeight = this.getHeight();
String sH = Integer.toString(scrHeight);
Log.v(TAG, "scrHeight =" + sH );
int imgHeight= mBitmap.getHeight();
String iH = Integer.toString(imgHeight);
Log.v(TAG, "imgHeight =" + iH );
int diff = scrHeight - imgHeight;
String dif = Integer.toString(diff);
Log.v(TAG, "diff =" + dif );
int dvd= diff/2;
// called when view is drawn
Paint paint = new Paint();
paint.setFilterBitmap(true);
// The image will be scaled so it will fill the width, and the
// height will preserve the image’s aspect ration
float aspectRatio = ((float) mBitmap.getWidth()) / mBitmap.getHeight();
Rect dest = new Rect(0, dvd, this.getWidth(),(int) (this.getWidth() / aspectRatio)+dvd);
String AR = Double.toString(dvd);
canvas.drawBitmap(mBitmap, null, dest, paint);
Toast.makeText(SpotGameActivity.this, AR, Toast.LENGTH_SHORT).show();