I want to crop picture got from FrameLayout(#+id/previewFrame) as overlapped ImageView(#+id/guide_line_view) yellow guide line boundary.
I got ImageView location and cropped image what I got from previewFrame camera along the border of ImageView.
But imageview location is different from where it is visible, so cropped image not coincide with what I expect
ImageView(#+id/guide_line_view) is rectangle border xml like this
What's wrong with my crop. I searched stackoverflow, google 7 hours, but nothing helps.
#drawable/guide_line.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:width="1dp"
android:color="#FFFF00"
android:dashGap="8dp"
android:dashWidth="30dp"/>
<corners android:radius="8dp" />
</shape>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2">
<FrameLayout
android:id="#+id/previewFrame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/guide_line_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="100dp"
android:background="#drawable/guide_line"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Bring Here"
android:textColor="#FFFF00"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/guide_line_view"
app:layout_constraintVertical_bias="0.207" />
</androidx.constraintlayout.widget.ConstraintLayout>
</FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/take"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="takePicture"
tools:ignore="ButtonStyle" />
<Button
android:id="#+id/close"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="close"
tools:ignore="ButtonStyle" />
</LinearLayout>
</LinearLayout>
To get imageview location
below guide variable asserted as global int
And I calculate at onWindowFocusChanged.
guide_left = imageview.getLeft();
guide_top = imageview.getTop();
guide_width = imageview.getWidth();
guide_height = imageview.getHeight();
I've tried this as well. And so on.
int[] guide_location = new int[2];
imageview.getLocationOnScreen(guide_location);
int guide_left = guide_location[0];
int guide_top = guide_location[1];
crop bitmap
public void takePicture() {
cameraView.capture(new Camera.PictureCallback(){
public void onPictureTaken(byte[] data, Camera camera){
try {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
Matrix matrix = new Matrix();
matrix.postRotate(90);
Bitmap r_bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
// crop the image
Bitmap cropped_bitmap = Bitmap.createBitmap(r_bitmap, guide_left, guide_top, guide_width, guide_height);
I save cropped_bitmap and check it is correct, but not.
Supposed you take a picture in resolution 4096×2160 , and then set in previewFrame,
but if your device only have 1920x1080 resolution, the previewFrame only measure size in 1920x1080
As post you want to crop the specified rect from the orgin picture , you need to scale the crop ratio up
from 1920x1080 to 4096x2160
--- Try below ---
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
Matrix matrix = new Matrix();
matrix.postRotate(90);
Bitmap r_bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
// scaled ratio
float ratio = 1f * bitmap.getWidth() / previewFrame.width;
// crop the image
Bitmap cropped_bitmap = Bitmap.createBitmap(r_bitmap,
(int) (guide_left * ratio),
(int) (guide_top * ratio),
(int) (guide_width * ratio),
(int) (guide_height * ratio));
Related
My Activity
BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap cameraBitmapNull = BitmapFactory.decodeByteArray(data, 0, data.length, options);
int wid = options.outWidth;
int hgt = options.outHeight;
Matrix nm = new Matrix();
Camera.Size cameraSize = camera.getParameters().getPictureSize();
float ratio = relativeLayout.getHeight() * 1f / cameraSize.height;
if (getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
nm.postRotate(90);
nm.postTranslate(hgt, 0);
wid = options.outHeight;
hgt = options.outWidth;
ratio = relativeLayout.getWidth() * 1f / cameraSize.height;
} else {
wid = options.outWidth;
hgt = options.outHeight;
ratio = relativeLayout.getHeight() * 1f / cameraSize.height;
}
float ratios = relativeLayout.getHeight() * 1f / cameraSize.height;
float[] f = new float[9];
matrix.getValues(f);
f[0] = f[0] / ratios;
f[4] = f[4] / ratios;
f[5] = f[5] / ratios;
f[2] = f[2] / ratios;
matrix.setValues(f);
Bitmap newBitmap = Bitmap.createBitmap(wid, hgt, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newBitmap);
Bitmap cameraBitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);
imgfool.setImageBitmap(cameraBitmap);
canvas.drawBitmap(cameraBitmap, nm, null);
imgfool.setVisibility(View.VISIBLE);
//imgfool.setScaleType(ImageView.ScaleType.MATRIX); //required
// nm.postRotate((float)0);
// imgfool.setRotation((float) 90);
// Bitmap rotated = Bitmap.createBitmap(cameraBitmap, 0, 0, cameraBitmap.getWidth(), cameraBitmap.getHeight(), nm, true);
//imgfool.setRotation(90);
imgfool.setImageBitmap(cameraBitmap);
cameraSurfaceView.setVisibility(View.GONE);
takeScreenShot(oopss);
My XML
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="55dp"
android:id="#+id/frame"
>
<RelativeLayout
android:id="#+id/containerImg"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<SurfaceView
android:id="#+id/surfaceView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/oopss">
<ImageView
android:id="#+id/imgfool"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:rotation="90"
android:scaleType="fitXY"
/>
<ImageView
android:id="#+id/logoImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:contentDescription="#string/app_name"
android:scaleType="matrix"
/>
</RelativeLayout>
<LinearLayout
android:id="#+id/redirect"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_gravity="bottom"
android:layout_marginBottom="10dp"
android:background="#000"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:layout_weight="1"
android:gravity="bottom"
android:orientation="horizontal"
android:visibility="gone">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginRight="10dp"
android:layout_weight=".33"
android:gravity="center"
android:orientation="horizontal">
<TextView
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/label"
android:layout_gravity="center"
android:gravity="center"
android:src="#drawable/glow"
android:text="Back"
android:textColor="#fff"
android:textSize="20sp" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</FrameLayout>
Here I have a imageview which do rotate to 90 degree but leave some space above and below eventhough i use match_parent and fitXY into my xml file.I searched a lot on this but did not found any appropriate solution of it.So please help me out with this. Actually the imageview here sets the bitmap image taken from surfaceview but When i set it on an imageview it gets rotated automatically.So I thought to rotate the ImageView to get the proper Image to be set on it.
Suppose I have a portrait bitmap that I have taken with my front facing camera.
How may I crop the bitmap to the shape of the oval-shaped overlay after I have taken the picture? The oval shape is centered to the screen. The oval shape has fixed height and width
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<!-- camera viewfinder here which fits the whole screen-->
<RelativeLayout
android:id="#+id/cameraLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:paddingTop="10dp">
<!--Custom buttons-->
</RelativeLayout>
<RelativeLayout
android:id="#+id/record_panel"
android:layout_width="match_parent"
android:layout_height="150dp"
android:background="#android:color/transparent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<!--Capture button-->
</RelativeLayout>
</RelativeLayout>
<!--the oval-shaped overlay-->
<ImageView
android:layout_width="210dp"
android:layout_height="318dp"
android:id="#+id/overlay"
android:layout_gravity="center"
android:src="#mipmap/oval" />
</FrameLayout>
Screenshot:
You can base your solution on how to crop a circle from a bitmap:
#Override
public Bitmap crop(Bitmap source) {
int size = Math.min(source.getWidth(), source.getHeight());
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
if (squaredBitmap != source) {
source.recycle();
}
Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
BitmapShader shader = new BitmapShader(squaredBitmap,
BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
paint.setShader(shader);
paint.setAntiAlias(true);
float r = size / 2f;
canvas.drawCircle(r, r, r, paint);
squaredBitmap.recycle();
return bitmap;
}
Now just change canvas.drawCircle to canvas.drawOval and give it appropriate values.
I am working on an instant chat application.I have to implement following screen.
In the screenshot you can see we have a circular image view where we are displaying the profile pic of the user.On profile pic we have a small circle having green color indicating that the user is online.I am implementing the screen using following xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="#dimen/padding10">
<FrameLayout
android:id="#+id/frame"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignParentLeft="true"
android:layout_marginLeft="#dimen/margin10">
<com.almabay.almachat.circularImageView.CircularImageView
android:id="#+id/imgContact"
android:layout_width="80dp"
android:layout_height="80dp "
android:layout_gravity="bottom|left" />
<com.almabay.almachat.circularImageView.CircularImageView
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_gravity="top|right"
android:background="#78dd63" />
</FrameLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/margin10"
android:layout_toRightOf="#+id/frame"
android:orientation="vertical"
android:padding="#dimen/padding5">
<TextView
android:id="#+id/txtNam"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Neeraj"
android:textSize="15sp" />
<TextView
android:id="#+id/stats"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin10"
android:text="Welocme to Almachat" />
</LinearLayout>
</RelativeLayout>
But i am getting the screen as is given below:
Here you can see that green color is not displayed in circle .It is displayed in square.However I have set the color in the design ,in actual practice i want to set it as green using java code when the user will be online .I have taken a circular image view .Still the background color is shown in square.Please guide me how can i fix the issue.
Solved the Issue:
Create a drawable named circle_green.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<gradient
android:angle="270"
android:endColor="#color/green_color"
android:startColor="#color/green_color" />
<stroke
android:width="2dp"
android:color="#color/while_color"></stroke>
</shape>
Used it in the background of an imageview
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="#dimen/padding10">
<com.almabay.almachat.circularImageView.CircularImageView
android:id="#+id/imgContact"
android:layout_width="80dp"
android:layout_height="80dp "
android:layout_alignParentLeft="true" />
<ImageView
android:id="#+id/online"
android:layout_width="15dp"
android:layout_height="15dp"
android:layout_alignRight="#+id/imgContact"
android:layout_alignTop="#+id/imgContact"
android:background="#drawable/circle_green" />
It is working for me now.
You need to create a CustomImageView like this...
public class CircularImageView extends ImageView {
public CircularImageView(Context context,AttributeSet attributeSet){
super(context,attributeSet);
}
#Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth(), h = getHeight();
Bitmap roundBitmap = getRoundedCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
public static Bitmap getRoundedCroppedBitmap(Bitmap bitmap, int radius) {
Bitmap finalBitmap;
if (bitmap.getWidth() != radius || bitmap.getHeight() != radius)
finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius,
false);
else
finalBitmap = bitmap;
Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
finalBitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
finalBitmap.getHeight());
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(finalBitmap.getWidth() / 2 + 0.7f,
finalBitmap.getHeight() / 2 + 0.7f,
finalBitmap.getWidth() / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(finalBitmap, rect, rect, paint);
return output;
}
}
And use the imageview class in your xml layout like this...
<com.xxxx.xxx.xxxx.CircularImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="#+id/std_img"
android:layout_alignParentLeft="true"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"/>
you can do something like this :
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/imgUserImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:scaleType="centerCrop"
android:src="#drawable/user_temp" />
<ImageView
android:id="#+id/imgOnlineIndicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/imgUserImage"
android:layout_alignTop="#+id/imgUserImage"
android:layout_marginLeft="#dimen/margin_small"
android:src="#drawable/online_indicator" />
</RelativeLayout>
This is just an example from my app.You can modify it accordingly and it serves your purpose.
* i used a small green image to show as online indicator.
You can use the powerful Constraint Layout.
The advantages are:
Consistency in different layout sizes.
Simple to implement.
You can animate the dot =).
Create a drawable named circle_green.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<gradient
android:angle="270"
android:endColor="#color/green_color"
android:startColor="#color/green_color" />
<stroke
android:width="2dp"
android:color="#color/while_color"></stroke>
</shape>
Align the online dot on your ImageView within the Constraint Layout.
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/profile_image"
android:layout_width="#dimen/avatar_profile_height"
android:layout_height="#dimen/avatar_profile_height"
android:layout_marginTop="#dimen/margin_medium"
android:src="#drawable/avatar_1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/online"
android:layout_width="12dp"
android:layout_height="12dp"
android:background="#drawable/circle_green"
android:contentDescription="#string/online_status"
app:layout_constraintCircle="#id/profile_image"
app:layout_constraintCircleAngle="150"
app:layout_constraintCircleRadius="#dimen/avatar_profile_radius" />
Ignore the warning that the ImageView is not constrained.
Finally, in order to animate, do the following:
view.button_home.setOnClickListener {
//1
val layoutParams = view.online.layoutParams as ConstraintLayout.LayoutParams
val startAngle = layoutParams.circleAngle
val endAngle = startAngle + 360
//2
val anim = ValueAnimator.ofFloat(startAngle, endAngle)
anim.addUpdateListener { valueAnimator ->
//3
val animatedValue = valueAnimator.animatedValue as Float
val layoutParam = view.online.layoutParams as ConstraintLayout.LayoutParams
layoutParam.circleAngle = animatedValue
view.online.layoutParams = layoutParam
//4
view.online.rotation = (animatedValue % 360 - 150)
}
//5
anim.duration = 2000
//6
anim.interpolator = LinearInterpolator()
anim.start()
}
I have the following layout for an activity that displays 4 870x3700 jpeg images (each around 200KB):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/scrollView2" >
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/testlay">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scaleType="centerInside"
android:id="#+id/imageView1"
android:contentDescription="#string/imageph" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scaleType="centerInside"
android:id="#+id/imageView2"
android:contentDescription="#string/imageph" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scaleType="centerInside"
android:id="#+id/imageView3"
android:contentDescription="#string/imageph" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scaleType="centerInside"
android:id="#+id/imageView4"
android:contentDescription="#string/imageph" />
</LinearLayout>
</ScrollView>
</LinearLayout>
And the below code in my onCreate method:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
setContentView(R.layout.test_pages);
ImageView imageView1 = (ImageView) findViewById(R.id.imageView1);
ImageView imageView2 = (ImageView) findViewById(R.id.imageView2);
ImageView imageView3 = (ImageView) findViewById(R.id.imageView3);
ImageView imageView4 = (ImageView) findViewById(R.id.imageView4);
imageView1.setImageResource(R.drawable.rsz_17_18_21);
imageView2.setImageResource(R.drawable.rsz_22_25_29);
imageView3.setImageResource(R.drawable.rsz_30_31_36);
imageView4.setImageResource(R.drawable.rsz_37_38);
Now on a tablet I'm able to display them with no problems but when I try to run the app on my mobile phone it throws an out of memory exception. I've tried several different resizing methods without any effect, even with a simple method to calculate the aspect ratio and return a height given the screen width.
How can I adjust the size of all the images in a way to avoid loading the original sized image into memory and make it scale down to the display screen's width while maintaining the aspect ratio?
try following
Calculate first the maximum possible inSampleSize that still yields an image larger than your target.
Second Load the image using BitmapFactory.decodeFile(file, options), passing inSampleSize as an option.
Third Resize to the desired dimensions using Bitmap.createScaledBitmap().
Hope this will help you.
Bitmap background = Bitmap.createBitmap((int)width, (int)height, Config.ARGB_8888);
float originalWidth = originalImage.getWidth(), originalHeight = originalImage.getHeight();
Canvas canvas = new Canvas(background);
float scale = width/originalWidth;
float xTranslation = 0.0f, yTranslation = (height - originalHeight * scale)/2.0f;
Matrix transformation = new Matrix();
transformation.postTranslate(xTranslation, yTranslation);
transformation.preScale(scale, scale);
Paint paint = new Paint();
paint.setFilterBitmap(true);
canvas.drawBitmap(originalImage, transformation, paint);
return background;
I have this ImageView in my layout:
<ImageView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:contentDescription="#string/image_divider"
android:paddingBottom="8dp"
android:paddingTop="4dp"
android:scaleType="fitXY"
android:src="#android:drawable/divider_horizontal_textfield" />
It's a horizontal divider. I want to rotate it 90 degrees so I have a vertical divider.
Is there any possible way to do it right here from the layout and not the Activity class?
You can use Available Since API Level 11
android:rotation="90"
Final Code to Put,
<ImageView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:rotation="90"
android:contentDescription="#string/image_divider"
android:paddingBottom="8dp"
android:paddingTop="4dp"
android:scaleType="fitXY"
android:src="#android:drawable/divider_horizontal_textfield" />
Add "id" at ImageView (if not generate auto):
android:id="#+id/imageView"
and use the "id" (kotlin example):
val imageView = findViewById<ImageView>(R.id.imageView)
imageView.setRotation(90f) // rotate 90 degree
You can do that in your code by creating a new bitmap object.
Check this out : http://android-er.blogspot.fr/2010/07/rotate-bitmap-image-using-matrix.html
And specifically this function
Matrix matrix = new Matrix();
matrix.postScale(curScale, curScale);
matrix.postRotate(curRotate);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);
myImageView.setImageBitmap(resizedBitmap);