Develop Reference

android, ImageView bottom of screen

Trying to put a ImageView on the bottom of the screen, + a fit width.
Fit width are ok, but image are near half its height too lower.
A guess: Are the Y of a Imageview centerBased?
Please don't profite "layout" solution, I look for a X, y, height, width solution. :)
(so simple in iOS )
private void layout_imageBottom(ImageView imageV) {
imageV.setScaleType(ImageView.ScaleType.FIT_XY);
imageV.setX(0);
imageV.setMinimumHeight(imageV.getHeight());
imageV.setMaxHeight(imageV.getHeight());
Integer iS= Settings.getScreenSize(getApplicationContext()).x;
imageV.setMinimumWidth(Settings.getScreenSize(getApplicationContext()).x);
imageV.setMaxWidth(Settings.getScreenSize(getApplicationContext()).x);
imageV.setY(Settings.getScreenSize(getApplicationContext()).y - imageV.getHeight());
}

Why don't you set it like this:
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)imageV.getLayoutParams();
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
imageV.setLayoutParams(params);

#Udi Idan was right, but if you still want to use X, Y, width, height solution then maybe you can try this
int width = screenW;
int height = 80;
final ImageView imageView = new ImageView(this);
LayoutParams params = new LayoutParams(width, height);
imageView.setLayoutParams(params);
imageView.setBackgroundResource(R.drawable.ic_launcher);
layout.addView(imageView);
imageView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
imageView.setX(0);
imageView.setY(layout.getMeasuredHeight() - imageView.getMeasuredHeight()
- imageView.getPaddingBottom() - imageView.getPaddingTop());
}
});
P/S: I tried some codes like your sample and get the wrong result, maybe we need to calculate ActionBar's height. You could try.

How get height of the a view with gone visibility and height defined as wrap_content in xml?

I have a ListView with visibility=gone and height=wrap_content, and i need its height to can make an animation of expand.
I already tried it:
view.measure(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
int height = view.getMeasuredHeight();
and
v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
int height = view.getMeasuredHeight();
and
v.measure(View.MeasureSpec.makeMeasureSpec(ViewGroup.LayoutParams.MATCH_PARENT, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(ViewGroup.LayoutParams.WRAP_CONTENT, View.MeasureSpec.UNSPECIFIED));
int height = view.getMeasuredHeight();
But it returned me a lesser value.
I am trying to do this after onResume.

The only way that i found was setting the width of the my view from width of a visible header view, then the below code returned me the right value.
int widthSpec = MeasureSpec.makeMeasureSpec(headerView.getWidth(), MeasureSpec.EXACTLY);
int heightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
v.measure(widthSpec, heightSpec);
int height = v.getMeasuredHeight();

view.post(new Runnable() {
#Override
public void run() {
view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
int height = view.getMeasuredHeight();
}
});
This worked for me. The method "post" makes sure the view is already added to the screen.

There is only one efficient way to do that if you want to animate height of a view whose visibility is gone
First add this in xml of hidden view
android:animateLayoutChanges="true"
then thats how you can set it to animate
yourView.layoutTransition.enableTransitionType(LayoutTransition.CHANGING)
Android will animate any layout change on that specific view

When an object is gone, it no longer is part of the layout. Maybe you mean to set your object to invisible, in which case you'll probably get a sensical value

This works for me
view.measure(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
int height = view.getMeasuredHeight();

How to get height in pixels of LinearLayout with layout_weight

this is my first post. I am learning to code in java for android apps.
I am using a LinearLayout "variable named: ll" with a predefined layout_weight (which I want to change whenever I want in the future) and height and width set to MATCH_PARENT. I want to get the height of this LinearLayout in pixels. I fill this using java (ll.addView(variableForAnObject);).
I am trying to get its height using ll.getLayoutParams().height; but I am getting -1. Because I believe this is the constant for MATCH_PARENT. Setting the height to 0dp makes the ll invisible and gives height as 0.
Please tell me if there's a way to get its height. I think I can do this by getting screen height using DisplayMetrics and making nearly impossible calculations (for me, at least) but this will be too complex.

try with ll.getHeight() should work
if not, it's because android has not yet calculed its bounds, then:
//inside of onCreate method should work
ll.post(new Runnable() {
#Override
public void run() {
//maybe also works height = ll.getLayoutParams().height;
height = ll.getHeight();
}
});

It is -1 because its dimensions have not yet been set, whenever you set layout it takes some time to compute the actual values including height, width etc.
Use OnLayoutListener to listen when it has finished with the layout.
layout.onLayoutChange (View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
//Extract values here
height = view.getHeight();
width = view.getWidth()
}
See this for more about the OnLayoutListener

Define your LinearLayout in your class and use getHeight() and getWidth(). Example:
LinearLayout yourLayout = (LinearLayout) findViewById (R.id.yourLL);
double height = yourLayout.getHeight();
double width = yourLayout.getWidth();
Hope it helps! :)

Give the id field in your layout xml file:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:id="#+id/<ID>>
Use this id to get reference in java class and find height and width:
LinearLayout linearLayout= (LinearLayout) findViewById (R.id.<ID>);
double height = linearLayout.getHeight();
double width = linearLayout.getWidth();

how can I get the width of the visible area of the view?

I have a view which is bigger than the screen.
How can I get the width of its currently visible area?
getWidth() returns the absolut size.

You can get the screen width using the following code:
If you're calling this outside of an Activity, you'll need to pass the context in (or get it through some other call). Then use that to get your display metrics:
DisplayMetrics metrics = context.getResources().getDisplayMetrics();
int width = metrics.widthPixels;
int height = metrics.heightPixels;
Using services you might do:
Display display= ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();

How to specify width of custom view?

I'm having trouble trying to set a specific size for the width of my custom view. I know I can just hard-code a value in the layout_width field in the XML file but I'm trying not to result to hard-coding values. I need my View to be half the size of the screen. So, within the class I find half the screen size:
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
try{
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
}catch(NoSuchMethodError e){
screenWidth = display.getWidth();
}
Then, I call:
measure(width|MeasureSpec.EXACTLY, LayoutParams.WRAP_CONTENT|MeasureSpec.EXACTLY);
//Where width is equal to half the screen width
but this does not seem to be working for my case. So, to sum it all up, how do you properly specify a particular size for a custom View? Any help will be useful and appreciated! Thanks!

Override the onMeasure() method in your Custom View:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = getResources().getDisplayMetrics().widthPixels >> 1;
widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
Basically, override the width MeasureSpec to be exactly half the width of the screen, then pass that through to the superclass.

I believe that you might not be able to accurately get the width of the screen at this point because you need to wait till the entire hierarchy (up until the most root view) is laid out. You may need to do something like:
ViewTreeObserver.OnGlobalLayoutListener layoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
int width = getWidth();
int height = getHeight();
//set layoutparams with those values.
}
};
getViewTreeObserver().addOnGlobalLayoutListener(layoutListener);
You can confirm the correctness of this by seeing if the values you're getting when you try getting the display width inside of onMeasure differ from the values you get when the onGlobalLayout callback is invoked.