Develop Reference

FIT_XY not working when scaling and rotating image using Matrix

I'm trying to resize and rotate an image and I want the full image to be shown, not a cropped version of the image. I have a resize button next to the image that when it is pressed performs the resize/rotation. I tried setting the scale type of the ImageView to FIT_XY and then tried FIT_CENTER but the image is always cropped, not scaled properly.
//MainActivity code
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RelativeLayout container = (RelativeLayout) findViewById(R.id.container);
RelativeLayout.LayoutParams layoutParamsImage = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
LinearLayout l1 = new LinearLayout(getApplicationContext());
LinearLayout l2 = new LinearLayout(getApplicationContext());
l2.setOrientation(LinearLayout.VERTICAL);
ImageView imageView = new ImageView(getApplicationContext());
Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.butterfly);
imageView.setImageBitmap(bitmap);
ImageView resizeButton = new ImageView(getApplicationContext());
resizeButton.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent motionEvent) {
LinearLayout stickerContainer = (LinearLayout) v.getParent().getParent();
ImageView stickerImage = (ImageView) stickerContainer.getChildAt(0);
double r=Math.atan2(motionEvent.getX()-stickerImage.getWidth(), stickerImage.getHeight()-motionEvent.getY());
int rotation=(int)Math.toDegrees(r);
int y = (int) motionEvent.getY();
int x1=0;
int y1=0;
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
x1 = (int) motionEvent.getX();
y1= (int) motionEvent.getY();
}
else if (motionEvent.getAction() == MotionEvent.ACTION_MOVE) {
int x2 = (int) motionEvent.getX();
int y2= (int) motionEvent.getY();
int height = Math.abs(y2-y1) *2;
int width = Math.abs(x2-x1) *2;
width = Math.max(width, 100);
height = Math.max(height, 100);
width = Math.min(width, 500);
height = Math.min(height, 500);
width=height;
float newRot=new Float(rotation);
Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.butterfly);
Matrix matrix=new Matrix();
matrix.postRotate(newRot,width,height);
matrix.postScale(2, 2);
stickerImage.requestLayout();
stickerImage.getLayoutParams().height = height;
stickerImage.getLayoutParams().width = width;
//Bitmap reDrawnBitmap=Bitmap.createBitmap(bitmap,0,0,width, height,matrix,true);
Bitmap reDrawnBitmap=Bitmap.createBitmap(bitmap,0,0,stickerImage.getWidth(), stickerImage.getHeight(),matrix,true);
//Bitmap reDrawnBitmap=Bitmap.createScaledBitmap(bitmap, dstWidth, dstHeight, filter)
stickerImage.setScaleType(ImageView.ScaleType.FIT_XY);
stickerImage.setAdjustViewBounds(true);
stickerImage.setImageBitmap(reDrawnBitmap);
stickerImage.setScaleType(ImageView.ScaleType.FIT_XY);
}
return true;
}
});
resizeButton.setBackgroundResource(R.drawable.resize);
layoutParamsImage.height = 100;
layoutParamsImage.width = 100;
imageView.setLayoutParams(layoutParamsImage);
l1.addView(imageView);
l2.addView(resizeButton);
l1.addView(l2);
//imageView.setMaxHeight(100);
//imageView.setMaxWidth(100);
container.addView(l1);
}
}
//layout code activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.doodle4.MainActivity"
tools:ignore="MergeRootFrame"></RelativeLayout>

I figured out the scaling part. I need to create a scaled Bitmap after creating the bitmap that is created using matrix.
In the
else if (motionEvent.getAction() == MotionEvent.ACTION_MOVE) {
code block use this code instead of what's there at the bottom:
Bitmap reDrawnBitmap=Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(), bitmap.getHeight(),matrix,true);
Bitmap reDrawnBitmapRescaled=Bitmap.createScaledBitmap(reDrawnBitmap, width, height, false);
stickerImage.setImageBitmap(reDrawnBitmapRescaled);

ImageView to scale to fixed height, but crop excess width

I would like my ImageView to scale in a particular fashion:
Scale so that the height of the image always fits the height of the ImageView
Crop any excess width
A picture speaks louder than a 1000 words, so here is a representation of how I want my ImageView to behave. Suppose it has a fixed height of say 100dp and suppose its width is match_parent.
Note that
on the phone layout, the image height is stretched, but the sides are cropped, akin to CROP_CENTER.
on the tablet layout, the image is also stretched to fit the ImageView height, behaving like FIT_CENTER
I suspect I need scaleType:matrix, but after that I'm lost. How can I make sure an image fits Y, but crops X?

In xml, use:
android:scaleType="centerCrop"
android:adjustViewBounds="true"
from & thanks to: https://stackoverflow.com/a/15600295/2162226

With a little help from my friends Carlos Robles and pskink, came up with the following custom ImageView:
public class FitYCropXImageView extends ImageView {
boolean done = false;
#SuppressWarnings("UnusedDeclaration")
public FitYCropXImageView(Context context) {
super(context);
setScaleType(ScaleType.MATRIX);
}
#SuppressWarnings("UnusedDeclaration")
public FitYCropXImageView(Context context, AttributeSet attrs) {
super(context, attrs);
setScaleType(ScaleType.MATRIX);
}
#SuppressWarnings("UnusedDeclaration")
public FitYCropXImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setScaleType(ScaleType.MATRIX);
}
private final RectF drawableRect = new RectF(0, 0, 0,0);
private final RectF viewRect = new RectF(0, 0, 0,0);
private final Matrix m = new Matrix();
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (done) {
return;//Already fixed drawable scale
}
final Drawable d = getDrawable();
if (d == null) {
return;//No drawable to correct for
}
int viewHeight = getMeasuredHeight();
int viewWidth = getMeasuredWidth();
int drawableWidth = d.getIntrinsicWidth();
int drawableHeight = d.getIntrinsicHeight();
drawableRect.set(0, 0, drawableWidth, drawableHeight);//Represents the original image
//Compute the left and right bounds for the scaled image
float viewHalfWidth = viewWidth / 2;
float scale = (float) viewHeight / (float) drawableHeight;
float scaledWidth = drawableWidth * scale;
float scaledHalfWidth = scaledWidth / 2;
viewRect.set(viewHalfWidth - scaledHalfWidth, 0, viewHalfWidth + scaledHalfWidth, viewHeight);
m.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER /* This constant doesn't matter? */);
setImageMatrix(m);
done = true;
requestLayout();
}
}

If you use scaleType:matrix you will need to create your own Matrix and asign it to the view by means of setImageMatrix(Matrix) or manually modify the matrix at hen onMEasure method of a customImageView.
public class MyImageView extends ImageView {
boolean done=false;
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (done)
return;
final Drawable d = getDrawable();
final int drawableW = d.getIntrinsicWidth();
final int drawableH = d.getIntrinsicHeight();
float ratio = drawableW / drawableH;
//int width = getMeasuredWidth();
int height = getMeasuredHeight();
float scale=height/drawableH;
Matrix m = getImageMatrix();
float[] f = new float[9];
m.getValues(f);
f[Matrix.MSCALE_X]=scale;
f[Matrix.MSCALE_Y]=scale;
m.setValues(f);
done = true;
requestLayout();
}
}

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
LayoutParams params;
final ImageView iv0 = new ImageView(this);
//iv0.setBackgroundColor(0xffff0000);
params = new LayoutParams(LayoutParams.MATCH_PARENT, 100);
ll.addView(iv0, params);
final ImageView iv1 = new ImageView(this);
//iv1.setBackgroundColor(0xff00ff00);
params = new LayoutParams(60, 100);
ll.addView(iv1, params);
setContentView(ll);
Runnable action = new Runnable() {
#Override
public void run() {
Drawable d = getResources().getDrawable(R.drawable.layer0);
int dw = d.getIntrinsicWidth();
int dh = d.getIntrinsicHeight();
RectF src = new RectF(0, 0, dw, dh);
ImageView[] iviews = {iv0, iv1};
for (int i = 0; i < iviews.length; i++) {
ImageView iv = iviews[i];
iv.setImageDrawable(d);
iv.setScaleType(ScaleType.MATRIX);
float h = iv.getHeight();
float w = iv.getWidth();
float cx = w / 2;
float scale = h / dh;
float deltaw = dw * scale / 2;
RectF dst = new RectF(cx - deltaw, 0, cx + deltaw, h);
Matrix m = new Matrix();
m.setRectToRect(src, dst, ScaleToFit.FILL);
iv.setImageMatrix(m);
}
}
};
iv1.post(action);

If you want to display the center of the image, use:
android:scaleType="centerCrop"
android:adjustViewBounds="true"
If you want to show the edge of the image instead of the center, use:
android:scaleType="matrix"
android:adjustViewBounds="true"

Rotate an image by 90,180,270 and 360 degrees every time a button is clicked and retain the rotation degree in portrait and landscape mode?

I am making an app in android where in an image has to be rotated whenever rotate button is clicked by 90,180,270 and 360 degrees. The rotation has to be the same in portrait and in landscape mode.
I am a beginner in Android Programming and I have basic knowledge of Java.
Kindly, help me soon.
The code that I have used is as below.I can only rotate it 90 degrees once. How do it continue with it?
btn_rotate = (ImageButton) findViewById(R.id.btn_rotate);
btn_rotate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Bitmap bmap = BitmapFactory.decodeResource(getResources(), R.drawable.about_us_ipad_p);
Display d = getWindowManager().getDefaultDisplay();
#SuppressWarnings("deprecation")
int x = d.getWidth();
#SuppressWarnings("deprecation")
int y = d.getHeight();
ImageView imgView = (ImageView) findViewById(R.id.imgViewEdit_Pic);
Bitmap scaledBmap = Bitmap.createScaledBitmap(bmap, y, x, true);
Matrix matrix = new Matrix();
matrix.postRotate(90, 180, 270);
Bitmap rotatedBmap = Bitmap.createBitmap(scaledBmap,0,0,scaledBmap.getWidth(),scaledBmap.getHeight(),matrix,true);
imgView.setImageBitmap(rotatedBmap);
}
});

this piece of code may help you and it is self explanatory...
public class TestActivity extends Activity {
private int rotation;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState != null) {
rotation = savedInstanceState.getInt("ANGLE");
}
final ImageView imageView = (ImageView) findViewById(R.id.imageView);
final Button button = (Button) findViewById(R.id.iv_icon);
DisplayMetrics metrics = getResources().getDisplayMetrics();
final int width = metrics.widthPixels;
final int height = metrics.heightPixels;
final Bitmap imageBitmap = BitmapFactory.decodeResource(
getResources(), R.drawable.image1);
final Bitmap scaledBitmap = Bitmap.createScaledBitmap(imageBitmap, width, height, true);
imageView.setImageBitmap(getRotatedBitmap(scaledBitmap));
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
rotation += 90;
rotation %= 360;
Bitmap bitmap = getRotatedBitmap(scaledBitmap);
imageView.setImageBitmap(bitmap);
}
});
}
private Bitmap getRotatedBitmap(Bitmap bitmap) {
if (rotation % 360 == 0) {
return bitmap;
}
Matrix matrix = new Matrix();
matrix.postRotate(rotation, bitmap.getWidth() / 2,
bitmap.getHeight() / 2);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight() / 2, matrix, true);
}
#Override
protected void onSaveInstanceState(Bundle outState) {
outState.putInt("ANGLE", rotation);
super.onSaveInstanceState(outState);
}
}

yourimage.setRotation(yourimage.getRotation() + 90);

In manifest file, lock your screen orientation like this:
android:screenOrientation="portrait"
or
android:screenOrientation="landscape"

How to rotate the image without changing its size?

I am developing an android app where I have to rotate a circular image around another circular image, but when I am running this the size of my circular image gets automatically changing continuously. So please help me how to solve this. Here is my code
public class JobSearch extends Activity implements OnTouchListener {
private ImageView dialer;
private float y=0;
public boolean onTouch(View v, MotionEvent event) {
double r=Math.atan2(event.getX()-dialer.getWidth()/2, dialer.getHeight()/2-event.getY());
int rotation=(int)Math.toDegrees(r);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
//x=event.getX();
y=event.getY();
updateRotation(rotation);
break;
case MotionEvent.ACTION_UP:
break;
}//switch
return true;
}//onTouch
private void updateRotation(double rot){
float newRot=new Float(rot);
Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.round_button_big);
Matrix matrix=new Matrix();
matrix.postRotate(newRot);//,bitmap.getWidth()/2,bitmap.getHeight()/2);
Bitmap reDrawnBitmap=Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
dialer.setImageBitmap(reDrawnBitmap);
if(newRot>=-5 && newRot<=5)
Toast.makeText(this,"12 O\'Clock",Toast.LENGTH_SHORT).show();
if(newRot>=85 && newRot<=95)
Toast.makeText(this,"3 O\'Clock",Toast.LENGTH_SHORT).show();
if(newRot>=175 || newRot<=-175)
Toast.makeText(this,"6 O\'Clock",Toast.LENGTH_SHORT).show();
if(newRot>=-95 && newRot<=-85)
Toast.makeText(this,"9 O\'Clock",Toast.LENGTH_SHORT).show();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dialer = (ImageView) findViewById(R.id.big_button);
dialer.setOnTouchListener(this);
}//onCreate
}

This this one; worked for me perfectly.
private Bitmap rotateBitmap(Bitmap bitmap, int rotationAngleDegree){
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int newW=w, newH=h;
if (rotationAngleDegree==90 || rotationAngleDegree==270){
newW = h;
newH = w;
}
Bitmap rotatedBitmap = Bitmap.createBitmap(newW,newH, bitmap.getConfig());
Canvas canvas = new Canvas(rotatedBitmap);
Rect rect = new Rect(0,0,newW, newH);
Matrix matrix = new Matrix();
float px = rect.exactCenterX();
float py = rect.exactCenterY();
matrix.postTranslate(-bitmap.getWidth()/2, -bitmap.getHeight()/2);
matrix.postRotate(rotationAngleDegree);
matrix.postTranslate(px, py);
canvas.drawBitmap(bitmap, matrix, new Paint( Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG | Paint.FILTER_BITMAP_FLAG ));
matrix.reset();
return rotatedBitmap;
}

Try this code for Rotating Image -
public class bitmaptest extends Activity {
#Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout linLayout = new LinearLayout(this);
// load the origial BitMap (500 x 500 px)
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.android);
int width = bitmapOrg.width();
int height = bitmapOrg.height();
int newWidth = 200;
int newHeight = 200;
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// rotate the Bitmap
matrix.postRotate(45);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
width, height, matrix, true);
// make a Drawable from Bitmap to allow to set the BitMap
// to the ImageView, ImageButton or what ever
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
ImageView imageView = new ImageView(this);
// set the Drawable on the ImageView
imageView.setImageDrawable(bmd);
// center the Image
imageView.setScaleType(ScaleType.CENTER);
// add ImageView to the Layout
linLayout.addView(imageView,
new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
)
);
// set LinearLayout as ContentView
setContentView(linLayout);
}
}
And, also see this Tutorial

This is my code to rotate image around itself and slowly reduce the speed
rotateAnimation1 = new RotateAnimation(0, 360,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
rotateAnimation1.setInterpolator(new LinearInterpolator());
rotateAnimation1.setDuration(duration);
rotateAnimation1.setRepeatCount(0);
imgBottle.startAnimation(rotateAnimation1);
flagSpinAvailable = false;
rotateAnimation1.setAnimationListener(new AnimationListener() {
public void onAnimationStart(Animation anim) {
};
public void onAnimationRepeat(Animation anim) {
};
public void onAnimationEnd(Animation anim) {
duration = duration + 70;
startMoving();
};
});

this is the code of rotate the image
Bitmap bMap = BitmapFactory.decodeResource(getResources(),R.drawable.test);
Matrix mat = new Matrix();
mat.postRotate(90);
Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0,
bMap.getWidth(), bMap.getHeight(), mat, true);
BitmapDrawable bmd = new BitmapDrawable(bMapRotate);
image.setImageBitmap(bMapRotate);
image.setImageDrawable(bmd);

adding rotate buttons - android map app

I currently working on a map application for the android.
the android emulator doesn't support multi touch so I cant rotate the map.
can someone refer me to where I can learn how to rotate the map and how to add the buttons ?

public class bitmaptest extends Activity {
#Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout linLayout = new LinearLayout(this);
// load the origial BitMap (500 x 500 px)
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.android);
int width = bitmapOrg.width();
int height = bitmapOrg.height();
int newWidth = 200;
int newHeight = 200;
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// rotate the Bitmap
matrix.postRotate(45);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
width, height, matrix, true);
// make a Drawable from Bitmap to allow to set the BitMap
// to the ImageView, ImageButton or what ever
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
ImageView imageView = new ImageView(this);
// set the Drawable on the ImageView
imageView.setImageDrawable(bmd);
// center the Image
imageView.setScaleType(ScaleType.CENTER);
// add ImageView to the Layout
linLayout.addView(imageView,
new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
)
);
// set LinearLayout as ContentView
setContentView(linLayout);
}
}