Develop Reference

How to put views on top of an ImageView, in relation to the ImageView's content size?

Background
Suppose I want to show an image of the something using an ImageView, and I want to put new views on top of it (animated ImageViews that show pins on a world map image, for example, or a Switch view on top of a smartphone image).
This means that no matter how the ImageView shows the image, the views should be in it, inside correct spot, with the same size as specified, or in a size related to the imageView itself
The problem
As opposed to other views, the ImageView can have a certain size, but its content is something else (to keep aspect ratio).
What I tried
I tried to use ConstraintLayout, but this can't really help, because the ImageView can change its size (for example when changing orientation), and thus ruining the position I've given the views compared to the ImageView.
I've found some libraries that can handle a similar thing (like here) and I even asked a similar question before (here), but all those solutions are for a static image within the ImageView, yet what I search for is adding a view on top of an ImageView.
The question
How do I put the views on top of the ImageView's content correctly?
How do I also scale the views down/up compared to the size of the ImageView's content ?
Can ConstraintLayout be used to change the scale of the views according to the ImageView's size ?

Make FrameLayout with wrap_content around ImageView. Then you could set SwitchView on top of ImageView. You could align it to center, side or corners and using margins to get some fine position.
It still won't scale with image, but you can get pretty good results. If that doesn't fit you, you can programatically get width/height of ImageView and alter position (or margins) of SwitchView accordingly.

With below you can manage width of switch or any other view as per image view width
android:layout_alignLeft="#+id/imageView"
android:layout_alignRight="#+id/imageView"
<Switch
android:id="#+id/swi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/imageView"
android:layout_alignRight="#+id/imageView" />
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/swi"
android:src="#drawable/download" />

In Java,
ImageView imgView = (ImageView) findViewById(R.id.imageView);
imageView.setBackgroundResource(R.drawable.yourDrawable);
int width = imgView.getDrawable().getIntrinsicWidth();
Switch switchKey = (Switch) findViewById(R.id.switchKey);
switchKey.setMinimumWidth(width);
And in XML, align it with alignLeft and alignRight with ImageView.

As far as i get it, you need the image size displayed inside the image view and set that as the max width of your switch view right?
You need both Java and XML for this,
The XML file is basically as RelativeLayout with the view stacked as needed.
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:src="#drawable/nonet_icon"
android:id="#+id/iconView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.v7.widget.SwitchCompat
android:layout_width="wrap_content"
android:visibility="gone"
android:layout_centerInParent="true"
android:layout_height="wrap_content"
android:id="#+id/switchView"/>
</RelativeLayout>
And the Java Code gets the imageWidth and sets it to the SwitchView.
mSwitchCompat.setVisibility(View.VISIBLE);
// 20% x 25% of Content in ImageView
final float x = mImageView.getDrawable().getIntrinsicWidth()*.2f;
final float y = mImageView.getDrawable().getIntrinsicHeight()*.25f;
// waiting for the view to be drawn
mSwitchCompat.post(new Runnable() {
#Override
public void run() {
// scale current view W.r.t. x and y values
mSwitchCompat.setScaleX((float)mSwitchCompat.getWidth()/x);
mSwitchCompat.setScaleY((float)mSwitchCompat.getHeight()/y);
}
});
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT);
// 30% x 35% of content, for location
int xMargin = Math.round(mImageView.getDrawable().getIntrinsicWidth()*.3f);
int yMargin = Math.round(mImageView.getDrawable().getIntrinsicHeight()*.35f);
// set margin values, can optionally add for top and bottom
layoutParams.setMargins(xMargin,0,yMargin,0);
mSwitchCompat.setLayoutParams(layoutParams);
Ref: Getting Displayed image size of an ImageView
Trying to get the display size of an image in an ImageView
Ref: Dynamic size values
Do comment if you need a detailed explaination.
Example: Check this image!
Scaled View on Image: Scaled View on Image!

You can use MarginLayoutParams with Relative Layout to set left and top position in ImageView.
image = (ImageView) findViewById(R.id.imageID);
MarginLayoutParams marginParams = new MarginLayoutParams(image.getLayoutParams());
marginParams.setMargins(left_margin, top_margin, right_margin, bottom_margin);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(marginParams);
image.setLayoutParams(layoutParams);
find complete information for this in below link :
MarginLayoutParams

Try this, may be it will help you.
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/img_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/semi_transparent"
android:layout_margin="#dimen/spacing_small"
android:layout_alignTop="#+id/img_background"
android:layout_alignBottom="#id/img_background">
//this layout will expand according to your image size
</RelativeLayout>
</RelativeLayout>

Do you want to show switch that lay on imageview ?
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ll_download"
android:layout_width="100dp"
android:layout_height="60dp"
android:layout_centerInParent="true"
android:orientation="vertical">
<ImageView
android:src="#android:drawable/btn_star_big_on"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<Switch
android:id="#+id/mySwitch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Switch" />
</RelativeLayout>

RadioButton center drawable / layout flattening

I have to do some flattening on my layout, below piece of it after. Percent TextView and RadioButton are in same place on the left and are switching using animations. Second TextView shows some text fulfilling width. Problem is that RadioButton is shorter than percent TextView, but I'm using alignLeft and alignRight for same width, and even with gravity set to center radio drawable is aligned left. I've found this topic, but is a bit old, before Material, and currently this class is more complicated. Any advice how to center this radio in own width (or width of percent textview) without! adding another ViewGroup? (precent and radio might be in another RelativeLayout and set centerInParent, as I had before tries for flattening)
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/option_percent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:singleLine="true"
android:gravity="center"
android:ems="3"
android:visibility="invisible"/>
<RadioButton
android:id="#+id/option_radio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignLeft="#id/option_percent"
android:layout_alignRight="#id/option_percent"
android:gravity="center"/>
<TextView
android:id="#+id/option_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_toRightOf="#id/option_percent"/>
</RelativeLayout>

OK, I have some workaround for my case. I'm not accepting this post, because its not a proper answer. Im still counting on another way, more elegant ;)
from above xml I've set fixed width for percent and removed ems, practically no difference. also removed aligning left and right to percent in radio attributes, so it have own size in both dimensions (wrap_content). next step is in code:
if(radioMarginLeft<0) {
int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(
percentTextView.getLayoutParams().width, View.MeasureSpec.AT_MOST);
int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
radioButton.measure(widthMeasureSpec, heightMeasureSpec);
radioMarginLeft = (percentTextView.getLayoutParams().width -
radioButton.getMeasuredWidth())/2;
}
((RelativeLayout.LayoutParams) radioButton.getLayoutParams()).leftMargin=radioMarginLeft;
measuring radio, percent now has fixed width, so no need to measure. radioMarginLeft is calculated only once and kept outside method, in my case it may be even static.
additional: be careful with setting padding for radio, because of Add margin between a RadioButton and its label in Android? (check most upvoted answer)

Adjust ImageView width according to height

I am trying to make a simple LinearLayout composed of an ImageView and TextView.
The ImageView should scale to match the LinearLayout height and not lose proportions while doing so.
This is the xml I currently have.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/logo"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:background="#CCCCCC"
android:scaleType="fitCenter"
android:src="#drawable/strip" />
<TextView
android:id="#+id/logoText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:singleLine="true"
android:text="what an awesome text"
android:textSize="18sp" />
</LinearLayout>
Using the above xml, the result is that the ImageView height will indeed match the LinearLayout height and it's width will be the same as the src image but the rendered image will scale properly and center, but this leaves the ImageView itself filling about 90% of the Layout's width as it's the src image width, leaving no space for the TextView.
I just would like to scale the ImageView to match the parent's height and it's width should be just as much needed to scale it proportionately.

Add a linear layout on the image view. Just the image view and nothing else. :) hope it helps
EDIT 1: As many of the other answers mentioned Using the layout_weight property will also help resolve this issue.

add weight 1 on imageview so there will be space for the textview

As I mentioned in the comment under your answer post where you cite KISHORE_ZE, it seems to be helpful only with an image of particular size, and on a particular screen density and resolution. So while it looks acceptable on your current device, it might be a mess on a different one. I suggest that you figure out what part of the layout you want to use for the image and use android:weight attributes for your ImageView and TextView to achieve wanted result.

As #KISHORE_ZE said, this solves the problem.
"Put the image view in a linear layout. Just the image view. Nothing else. "

this visual guide is a lot helpful.
link
in your image view add:
android:scaleType="fitCenter"
or
android:scaleType="fitXY"
whichever suites you.

How to set a textView width dynamically larger than the width of the screen after animation?

I have a text view with a height which wraps content and a width that matches parent. So that the textView width == the screen Width.
But at one point I want the text to rotate 90 degrees.
Now I want to be able to change the views width so that it is the devices height instead of width.
This would cause that the width would expand.
(Basically like when one does orientation changes, but I can´t just have an orientation change for only one textview so I have to rotate it.)
My problem: I can´t set the textViews width larger than the device width.
Even when I am already done with the animation.
So is it possible to make the textView width larger than the device width?
and if not can anyone please suggest how I could solve my problem because I really need to change the orientation of the textView...
EDIT----EDIT
Is there a way to create a landscape text view and put it in a portait activity? That would completly solve my problems of the last week...
EDIT
My fragment:
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/f"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/t"
/>
</RelativeLayout>
I tried different things like
fragment.setRotation(90);
LayoutParams params = fragment.getLayoutParams();
params.height = text.getHeight();
params.width = deviceHeight;
fragment.setLayoutParams(params);
LayoutParams params1 = text.getLayoutParams();
params1.height = text.getHeight();
params1.width = deviceHeight;
text.setLayoutParams(params1);
EDIT________EDIT
Or has anyone ever written something like a verticalTExtView Class?

You can set the attributes of TextView as android:singleLine="true" and android:layout_width="wrap_content" and android:layout_height="wrap_content" // incase if you do not want the height to be increashed so singleLine is making the text to go out of screen width then you will need ScrollView for such behavior.
Hope this helps.

Is there a way to specify android:layout_height dynamically during onCreate?

I would like to set
android:layout_height="wrap_content"
to some pixels(int) during my application start. This is a textView and the reason behind this is that i want the height of the textView dynamic based on some inputs from my end which will be computed when the onCreate method is called.
Is this possible? if yes any example would be great.
Forgot to add my textView xml looks like this
<TextView
android:id="#+id/sometext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:fadingEdge="vertical"
android:background="#drawable/dropshadow"
android:scrollbars="vertical"
android:text="Getting data on your slow n/w..."
android:textColor="#ffffff"
/>

Just edit the layout params of the view.
TextView v = (TextView) findViewById(R.id.sometext);
LayoutParams lp = v.getLayoutParams();
lp.height = 50;
v.setLayoutParams(lp);
The view will be 50px high in this example.
Note that it's generally not recommended to use pixel dimensions for layouts due to the many device specs out there. Rather use dp (density independent pixels) instead. You can calculate pixel dimensions from dp values in the following way (50dp to px here):
float dp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50,
getResources().getDisplayMetrics());