Develop Reference

android , moving view in linearlayout

I made a linear layout and it contain some Image views . when i move one with (set X(view.get x + 10)) function, it moves... but it moves behind other views. that the view become hidden.
and the other problem is when i get X & Y of the view, its always 0,0. but the view is in the middle of the screen. what should I do??? should i give up with linear layout??
if(wichmov == "right" ){
if(martin.getX() < width){
martin.setX(martin.getX()+ deltax);
}
else if(wichmov == "left"){
if(martin.getX() > 0){
martin.setX(martin.getX()- deltax );
}
}
}
this is how i move it.

When are you trying to call getX()? This might be something to look into: View getX() and getY() return 0.0 after they have been added to the Activity
If you're making the call in onCreate, it'll be zero.

I just figured it out.
I use a relative layout and then set the linear layout as match parent. After designing the background with the linear layout, I define an image view after the linear layout and inside of the relative layout, and then in Java, I set the position of it in the exact place I want it to (front of the special box of linear layout that I wanted it move), and width and height of it too.
The following code will help you to place your view to the exact place of your screen you want it, and set its width and height:
DisplayMetrics metrics = this.getResources().getDisplayMetrics(); //getting screen size
width = metrics.widthPixels;
height = metrics.heightPixels;
view.setX(width *5/8); //setting the place
view.setY(height/4);
LayoutParams para = view.getLayoutParams(); //set size of view
para.height = (int) (height/2);
para.width = (int) (width/4);
view.setLayoutParams(para);

android scrollview scroll to top direction when new view added

In scrollview, if I add any view in middle, normally all the views below the added view scrolls downside. But I want to scroll the top views of added view to upside without disturbing the bottom views. Is it possible in scrollview , please help me ?
In the figure , If view 4 was added , then view 1 has to be scrolled upwards , without changing the positions of view 2 and view 3.

You can probably get the height of the view you are adding with and then scroll the scrollview manually that many pixels
scrollView.scrollBy(0, viewAdded.getHeight())

I've been wanting to try this question for quite some time, I finally got the chance today. The method is pretty simple (in fact, #dweebo already mentioned it earlier) - we move the ScrollView up as we add the view. For getting precise (and valid) dimensions when adding, we use a ViewTreeObserver. Here's the code you can get hints from:
// Getting reference to ScrollView
final ScrollView scrollView = (ScrollView) findViewById(R.id.scrollView);
// Assuming a LinearLayout container within ScrollView
final LinearLayout parent = (LinearLayout) findViewById(R.id.parent);
// The child we are adding
final View view = new View(ScaleActivity.this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 100);
view.setLayoutParams(params);
// Finally, adding the child
parent.addView(view, 2); // at index 2
// This is what we need for the dimensions when adding
ViewTreeObserver viewTreeObserver = parent.getViewTreeObserver();
viewTreeObserver.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
#Override
public boolean onPreDraw() {
parent.getViewTreeObserver().removeOnPreDrawListener(this);
scrollView.scrollBy(0, view.getHeight());
// For smooth scrolling, run below line instead
// scrollView.smoothScrollBy(0, view.getHeight())
return false;
}
});

get position of view with respect to top-most parent in android

To get a view relative to its parent, I can use getLeft(), getRight(), getTop(), and getBottom(). But how do I get a view relative to the top-most parent of the layout file?
So say my eve layout is RelativeLayout. Then say inside eve I have a number of nested layouts. And then deep within the hierarchy I have a EditText view. How do I get the location of the EditText view with respect to eve?

To find out absolute view location, you can use view.getLocationOnScreen() or view.getLocationInWindow().

View target = findViewById(R.id.target_id);
View parent = (View)target.getParent();
int x = target.getLeft();
int y = target.getTop();
while(parent != null){
x += parent.getLeft();
y += parent.getTop();
parent = (View)parent.getParent()
}
These code may be help you, because I didn't test it. I hope it would work.

ImageViews added to FrameLayout have zero dimensions

I am developing a custom ViewGroup that contains a number of views. In the constructor, I create a number of FrameLayouts that will each contain two ImageViews. Each Framelayout and the child views are created using the following code.
FrameLayout frame = new FrameLayout(context);
ImageView digitView = new ImageView(context);
digitView.setScaleType(ScaleType.CENTER_CROP);
frame.addView(digitView,
new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
ImageView bezelView = new ImageView(context);
bezelView.setScaleType(ScaleType.CENTER_CROP);
bezelView.setImageResource(R.drawable.bezel);
frame.addView(bezelView);
this.addView(frame, params);
In the onMeasure callback I set the dimensions of the custom ViewGroup
this.setMeasuredDimension(254, 43);
and in the onLayout callback, I calculate the dimensions of each of the FrameLayouts and call the layout method for each
#Override
protected void onLayout (boolean changed, int left, int top, int right, int bottom)
{
if (changed)
{
float width = (float)(right - left) / (float)this.digits;
if ((int)(width/ASPECT_RATIO) > bottom- top)
width = (float)(bottom - top) * ASPECT_RATIO;
this.digitWidth = (int)width;
this.digitHeight = (int)(width/ASPECT_RATIO);
this.xOffset = ((right - left) - (this.digits * this.digitWidth))/2;
this.yOffset = ((bottom - top) - this.digitHeight)/2;
for (int i = this.digits-1; i >=0; i--)
{
int x = xOffset + i * this.digitWidth;
this.placeFrames.get(i).layout(x, this.yOffset, x + this.digitWidth, yOffset + this.digitHeight);
}
}
}
The issue I am having is that the FrameLayouts are being correctly sized and positioned within the custom GroupView, but the ImageViews are not being resized by the FrameLayouts - they have zero width and height. I validated this using the HierarchyViewer.
I think I've missed something - I assumed that the layout method on the FrameLayout would take care of resizing the child ImageViews based on the layout parameters passed in when they were added to the FrameLayout as children, but it seems not.
A pointer in the right direction would be very much appreciated.
Thanks
Andrew

I assumed that the layout method on the FrameLayout would take care of resizing the child ImageViews based on the layout parameters passed in when they were added to the FrameLayout as children, but it seems not.
You are not layout() these ImageView objects yourself nor calling super.onLayout()..

Get itemPosition in the layout (x and y parametres)

I have a RelativeLayout in which i have one ImageButton.
I need the position parametres of this item and I don,t know how to get them.
I have try with:
ImageButton user = (ImageButton) findViewById(R.id.User);
int x =user.getTop();
int y =user.getLeft();
But the result is allways 0;
Thank you.

I think you are invoking this method when the layout is being drawn, instead you should use:
ViewTreeObserver observer = user.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
//in here, place the code that requires you to know the dimensions.
//Place your code here
}
}

getTop() and getLeft() returns you the location of the view relative to its parent. For instance, when getLeft() returns 20, that means the view is located 20 pixels to the right of the left edge of its direct parent. See here under the point position. Try something like:
user.getParent().getLeft();
hope that helps!

Because your ImageButton was not calculated its position ready on that time.
see How to get an Android widget's size after layout is calculated?
Do not try to get position in onCreate(), that always returns 0.