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How to center setLogo drawable programatically in toolbar

I have a custom toolbar that's built without a xml, all the code is just written in java. I am using the setLogo() method to add a drawable but the image's default gravity is to the left. How can I change its position/gravity so that it's in the middle?
I was trying to override the setLogo() method but I can't apply a LayoutParams to a drawable.
This is what I am talking about:
#Override
public void setLogo(#DrawableRes int resId) {
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
float factor = getContext().getResources().getDisplayMetrics().density;
int margin = (int) (16 * factor);
lp.setMargins(margin, 0, margin, 0);
lp.gravity = Gravity.CENTER;
resId.setLayoutParams(lp); // this does not work
setLogo(AppCompatResources.getDrawable(getContext(), resId));
}
What's the right way to achieve this without a xml to refer to?
Thanks!

ConstraintLayout Guideline Percent Animation

I'm fairly new on using ConstraintLayout (java).
What I want to achieve is something like when the numpad is being shown/hidden as a slide animation, I've tried something like this:
Animation a = new Animation() {
#Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
ConstraintLayout.LayoutParams lparams = (ConstraintLayout.LayoutParams) guideline.getLayoutParams();
lparams.guidePercent = 0.5f;
guideline.setLayoutParams(lparams);
}
};
a.setDuration(3000);
a.setFillAfter(true);
guideline.startAnimation(a);
Yes, the guideline (and corresponding views that is attached to it) is being moved to the center of the screen but it is not as smooth as it is supposed to be. Is there a way to achieve the smoothness of the animation?
Any suggestion would be much appreciated!

You can use a ValueAnimator
Sample in Kotlin.
val guideline = findViewById<View>(R.id.guideline2) as Guideline
val end = (guideline.layoutParams as ConstraintLayout.LayoutParams).guidePercent
// get end percent. start at 0
val valueAnimator = ValueAnimator.ofFloat(0f, end)
valueAnimator.duration = 3000
// set duration
valueAnimator.interpolator = AccelerateDecelerateInterpolator()
// set interpolator and updateListener to get the animated value
valueAnimator.addUpdateListener { valueAnimator ->
val lp = guideline.layoutParams as ConstraintLayout.LayoutParams
// get the float value
lp.guidePercent = valueAnimator.animatedValue as Float
// update layout params
guideline.layoutParams = lp
}
valueAnimator.start()
Java Version
final Guideline guideline = findViewById(R.id.guideline2) ;
ConstraintLayout.LayoutParams lp = (ConstraintLayout.LayoutParams)guideline.getLayoutParams();
float end =lp.guidePercent;
ValueAnimator valueAnimator = ValueAnimator.ofFloat(0f, end);
valueAnimator.setDuration(3000);
valueAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
ConstraintLayout.LayoutParams lp = (ConstraintLayout.LayoutParams)guideline.getLayoutParams();
lp.guidePercent = valueAnimator.getAnimatedFraction();
guideline.setLayoutParams(lp);
}
});

Try animating your layout with ConstraintSet. See Beautiful animations using Android ConstraintLayout.
[T]here is one other benefit of ConstraintLayout that most people are unaware of and the official documentation curiously doesn’t mention anything about: performing cool animations on your ConstraintLayout views with very little code.
There are other sources and some videos on this technique. I think that you will find it a smoother way to do what you are trying to do.

Add image to location where user click on Layout

I am trying to add image to the point (X,Y) on Layout i have created dynamicaly.
I want to add the imageview on exact user clicked location. But the image is not placed on correct location when clicked.
here is my code
final LinearLayout layoutColumnBoxes = new LinearLayout(getParent());
layoutColumnBoxes.setBackgroundColor(Color.GREEN);
layoutColumnBoxes.setId(counterIdForBoxes);
layoutColumnBoxes.setLayoutParams(layoutParamsColumns);
layoutColumnBoxes.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
Toast.makeText(getParent(),"Event="+event.getX()+"Event Y = "+event.getY(),Toast.LENGTH_SHORT).show();
return false;
}
});
layoutColumnBoxes.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ImageView imageView = new ImageView(getParent());
imageView.setImageResource(R.drawable.crack);
LinearLayout lay = (LinearLayout) view.findViewById(v.getId());
lay.addView(imageView);
// Toast.makeText(getParent(),"Clicked View Id is="+v.getId(),Toast.LENGTH_SHORT).show();
}
});
Please help.

See I know what you're trying to say cause I too had this problem a few months back when developing an application. When you click a point on the screen the position of the imageview is not close to the way you clicked it right?
the things I did were
1) remove the excess space around your image.
This is optional. The only reason I stated this was because it depends on the type of image in your image view cause later you will be placing the image based on the top left corner of the imageview.
2) if your loading the images from the drawable folder make sure that you have the right size image in the right folder. This is IMPORTANT. if you screw up the sizes, android is going to alter the size and location of your images based on when your touch is based on the screen.
3) you need to set the margins of your image view properly. After hours of googling I came up with the following first you'll need to get half the height and width of your imageview, use imageview.getMeasuredHeight() / 2 and imageview.getMeasuredWidth() / 2 (Call these imgH and imgW respectively for explanation purposes)
the later in your OnTouchListener you'll have to set the top left margin of your imageview (the methods vary on the type of layout you use). This is done by setting the top margin at "event.getY - imgH" and the left margin at "event.getX - imgW"
I have an app in the playstore which uses this feature, you can check it here .
I hope this has solved your problem :) if it hasn't then don't hesitate to speak your doubts.

this code work for me:
public class MainActivity extends ActionBarActivity {
float x, y;
RelativeLayout rl;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getActionBar().hide();
rl = (RelativeLayout) findViewById(R.id.root_view);
rl.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
// rl.removeView(iv);
x = motionEvent.getX();
y = motionEvent.getY();
setImageLocation(x, y);
//rl.addView(iv);
}
return false;
}
});
}
public void setImageLocation(float x, float y) {
ImageView newImage;
RelativeLayout.LayoutParams newparams;
newparams = new RelativeLayout.LayoutParams(20, 20);
newparams.setMargins((int) (x-rl.getPaddingLeft()), (int) (y-rl.getPaddingTop()), 0, 0);
newImage = new ImageView(this);
newImage.setLayoutParams(newparams);
newImage.setImageResource(R.drawable.clock);
rl.addView(newImage);
}
}
activity_main.xml layout only has one relativeLayout that has full screen size(match parent)

pie chart with rotation features in android os using achartengine library [duplicate]

I have a button that I want to put on a 45 degree angle. For some reason I can't get this to work.
Can someone please provide the code to accomplish this?

API 11 added a setRotation() method to all views.

You could create an animation and apply it to your button view. For example:
// Locate view
ImageView diskView = (ImageView) findViewById(R.id.imageView3);
// Create an animation instance
Animation an = new RotateAnimation(0.0f, 360.0f, pivotX, pivotY);
// Set the animation's parameters
an.setDuration(10000); // duration in ms
an.setRepeatCount(0); // -1 = infinite repeated
an.setRepeatMode(Animation.REVERSE); // reverses each repeat
an.setFillAfter(true); // keep rotation after animation
// Aply animation to image view
diskView.setAnimation(an);

Extend the TextView class and override the onDraw() method. Make sure the parent view is large enough to handle the rotated button without clipping it.
#Override
protected void onDraw(Canvas canvas) {
canvas.save();
canvas.rotate(45,<appropriate x pivot value>,<appropriate y pivot value>);
super.onDraw(canvas);
canvas.restore();
}

I just used the simple line in my code and it works :
myCusstomView.setRotation(45);
Hope it works for you.

One line in XML
<View
android:rotation="45"
... />

Applying a rotation animation (without duration, thus no animation effect) is a simpler solution than either calling View.setRotation() or override View.onDraw method.
// substitude deltaDegrees for whatever you want
RotateAnimation rotate = new RotateAnimation(0f, deltaDegrees,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
// prevents View from restoring to original direction.
rotate.setFillAfter(true);
someButton.startAnimation(rotate);

Rotating view with rotate() will not affect your view's measured size. As result, rotated view be clipped or not fit into the parent layout. This library fixes it though:
https://github.com/rongi/rotate-layout

Joininig #Rudi's and #Pete's answers. I have created an RotateAnimation that keeps buttons functionality also after rotation.
setRotation() method preserves buttons functionality.
Code Sample:
Animation an = new RotateAnimation(0.0f, 180.0f, mainLayout.getWidth()/2, mainLayout.getHeight()/2);
an.setDuration(1000);
an.setRepeatCount(0);
an.setFillAfter(false); // DO NOT keep rotation after animation
an.setFillEnabled(true); // Make smooth ending of Animation
an.setAnimationListener(new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {}
#Override
public void onAnimationRepeat(Animation animation) {}
#Override
public void onAnimationEnd(Animation animation) {
mainLayout.setRotation(180.0f); // Make instant rotation when Animation is finished
}
});
mainLayout.startAnimation(an);
mainLayout is a (LinearLayout) field

As mentioned before, the easiest way it to use rotation available since API 11:
android:rotation="90" // in XML layout
view.rotation = 90f // programatically
You can also change pivot of rotation, which is by default set to center of the view. This needs to be changed programatically:
// top left
view.pivotX = 0f
view.pivotY = 0f
// bottom right
view.pivotX = width.toFloat()
view.pivotY = height.toFloat()
...
In Activity's onCreate() or Fragment's onCreateView(...) width and height are equal to 0, because the view wasn't measured yet. You can access it simply by using doOnPreDraw extension from Android KTX, i.e.:
view.apply {
doOnPreDraw {
pivotX = width.toFloat()
pivotY = height.toFloat()
}
}

if you wish to make it dynamically with an animation:
view.animate()
.rotation(180)
.start();
THATS IT

#Ichorus's answer is correct for views, but if you want to draw rotated rectangles or text, you can do the following in your onDraw (or onDispatchDraw) callback for your view:
(note that theta is the angle from the x axis of the desired rotation, pivot is the Point that represents the point around which we want the rectangle to rotate, and horizontalRect is the rect's position "before" it was rotated)
canvas.save();
canvas.rotate(theta, pivot.x, pivot.y);
canvas.drawRect(horizontalRect, paint);
canvas.restore();

fun rotateArrow(view: View): Boolean {
return if (view.rotation == 0F) {
view.animate().setDuration(200).rotation(180F)
true
} else {
view.animate().setDuration(200).rotation(0F)
false
}
}

That's simple,
in Java
your_component.setRotation(15);
or
your_component.setRotation(295.18f);
in XML
<Button android:rotation="15" />

Add an image as background and put other images on top of it

I am creating an image by using Canvas- and Bitmap class. I want to set it as a background for the user. Then I want to add some more images on top of it.
this is the code for image that is supposed to be as background.
ImageView imgMap1 = (ImageView) findViewById(R.id.imgMap1);
imgMap1.setImageDrawable(new BitmapDrawable(Bitmap.createBitmap(bmp, 0, 0, 500, 500)));
and this is the code to make it as background:
LinearLayout ll = new LinearLayout(this);
ll.setBackgroundResource(R.drawable.nn);
this.setContentView(ll);
The Problem here is: When I set it as background, I can't see the other photo anymore.
How can I do this?
Thanks in advance.
The other Images are added in the Layout. they are movable by finger touch. user can reposition them by finger.
ImageView i1 = (ImageView) findViewById(R.id.Image1);
ImageView i2 = (ImageView) findViewById(R.id.Image2);

The layout is built from the top down in your XML file, or in the order you add elements in code. It sounds like your other images is being added to the layout first, either as a higher-up element in the XML file, or earlier in your code. You'll need to add the other code as context for a complete answer.

Just noticed that you can directly set Bitmap as your ImageView's content using setImageBitmap(Bitmap bm)See the Android Reference
Then let talk about your question.
First, create your own class extends the View;
Second, load background image and overlay image using Bitmap
Third, invoke onTouch event, so that the onDraw method will automatically redraw the overlay image using the coordinates returned by onTouch
Something like:
public class dragndrop extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
// using this to load your background image
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inPreferredConfig = Bitmap.Config.RGB_565; // this is not a must
bmBackground = BitmapFactory.decodeFile(filePath, opt);
super.onCreate(savedInstanceState);
DrawView dv = new DrawView(dragndrop.this);
setContentView(dv);
}
public class DrawView extends View {
Point coordinate;
public DrawView(Context context) {
super(context);
setFocusable(true); //necessary for getting the touch events
}
#Override
protected void onDraw(Canvas canvas) {
// assume you have already load your background image as bitmap
canvas.drawBitmap(bmBackground, 0, 0, null);
// assume bm is the overlay image you need to put on top,
// the method here will draw the object with the coordinate you give
canvas.drawBitmap(bm, coordinate.x, coordinate.y, null);
}
// events when touching the screen
public boolean onTouchEvent(MotionEvent event) {
int eventaction = event.getAction();
int x = (int)event.getX();
int y = (int)event.getY();
switch (eventaction ) {
case MotionEvent.ACTION_DOWN:
// add code here to determine the point user touched is within the object or not
break;
}
}
break;
case MotionEvent.ACTION_MOVE: // touch 'n' drag
// pass the touch point to your object
coordinate.x = x;
coordinate.y = y;
break;
case MotionEvent.ACTION_UP:
// touch drop - just do things here after dropping
break;
}
// redraw the canvas
invalidate();
return true;
}
}
}
This is my own snippet, please edit before use, and please let me know when your question is resolved.