dynamically cloning a LinearLayout in android? - android

Say I have a LinearLayout with some elements in it as an .xml file.
In Java, I need to somehow "clone" it a few times into an array, edit some of its children, and then loop through the array, adding each LinearLayout to my main view.
What do you think would be the correct way to "clone" this layout from an xml file into an array element in java?
Thanks!


LayoutInflater vi = (LayoutInflater) myContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.yourLayoutId, null);
you can do some thing like this to inflate the view, and then modify the element iside the view using the findViewById method. Hope this will help


Something like this:
....
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout layout = null;
for(....) {
layout = (LinearLayout) inflater.inflate(R.layout.YOUR_LAYOUT_ID, null);
someList.add(layout);
}
.....


Try getting the layout in a variable:
for (int c=0; c < count; c++)
{
LinearLayout layout = (LinearLayout) findViewById(R.id.yourmainlayout);
// do something with layout
// assign layout to a variable or add it on another layout
}

Related

Not being able to add multiple child views to parent view

I am trying to add multiple relative layouts to a Linear layout. I am using the following lines of code.
LayoutInflater inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout item = (LinearLayout)findViewById(R.id.reviews);
for(int i=0 ; i<2 ; i++){
View child = inflator.inflate(R.layout.review_item, null);
child.setId(i);
child.setTag(i);
item.addView(child);
}
But I can only see one child view. Can anyone tell me where I am going wrong.

Declare the LinearLayout item outside of the for loop.
The way you're doing it the variables value will be overwritten each time you run through the for loop. So your method should look like this:
public void somemethod(){
LayoutInflater inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout item = (LinearLayout)findViewById(R.id.reviews);
for(int i=0 ; i<2 ; i++)
{
View child = inflator.inflate(R.layout.review_item, null);
child.setId(i);
child.setTag(i);
item.addView(child);
}
}

You need to take the first two lines outside of the for loop. You're inflating the LinearLayout twice, which overrides the first layout you inflate, rather than adding to it. By putting those two lines before the for loop starts, you'll add both child views to a single LinearLayout.

Android: Load layout from xml to new layout

I want to load layout dafined in xml to newly created LinearLayout object. Is that possible?
LinearLayout new_layout = new LinearLayout(context);
new_layout.load(R.layout.my_layout); // is something like this possible?

What you're trying to achieve is usually done this way
LayoutInflater inflater = LayoutInflater.from(context);
LinearLayout newLayout = (LinearLayout) inflater.inflate(R.layout.my_layout, null);

Inflate a linear layout from R.id and not R.layout

I'm going nuts here. I have a layout for a fragment. Inside I have among other things a LinearLayout with an id, say for example myLinearLayout. Basically, I want to do the following:
LinearLayout newLayout = new LinearLayout(this);
LinearLayout layoutCopy = inflatefrom(R.id.myLinearLayout);
newLayout.addView(layoutCopy);
How can I do this?

you can not inflate a Layout from its R.id, but you can inflate the Layout through R.layout and use the view returned to retrieve the R.id you need.
For instance
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.mylayout, null);
LinearLayout layoutCopy = (LinearLayout)view.findViewById(R.id.myLinearLayout);
check for typo

Try this one:
View.inflate(Context, R.id, ViewGroup)

Actually blackbelt, that's pretty much how I solved it, but I still got error when adding the copied layout to the new layout. The reason was because the layout I wanted to copy still had a parent. Here's a complete sollution (layoutRoot is an xml layout that lives in res/layout and myLinearLayout is a LinearLayout inside the file layoutRoot. layoutToPlaceCopiedLayout is a LinearLayout inside the layout where I want to put the copied layout).
LinearLayout newLayout = (LinearLayout)findViewById(R.id.layoutToPlaceCopiedLayout)
LayoutInflater inflater = LayoutInflater.from(this);
LinearLayout layoutRootCopy = (LinearLayout)inflatefrom(R.layout.layoutRoot);
LinearLayout layoutCopy = (LinearLayout)layoutRootCopy.findViewById(R.id.myLinearLayout);
ViewGroup parent = (ViewGroup)layoutCopy.getParent();
int index = parent.indexOfChild(layoutCopy);
parent.removeView(layoutCopy);
newLayout.addView(layoutCopy, index);

Add custom layout (from file) to another layout

Content view is a LinearLayout. We'll call it llOne and we'll say it's in the file llOne.xml.
The view I'm trying to add is also a LinearLayout but they're in separate files. We'll call it llTwo and we'll say it's in the file llTwo.xml.
setContentView(R.layout.llOne);
LinearLayout llOne = (LinearLayout) findViewById(R.id.llOne);
LinearLayout llTwo = (LinearLayout) findViewById(R.id.llTwo);
llOne.addView(llTwo); //NullPointerException

you need to inflate the second layout, as setContentView only inflate your llOne
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View otherView = inflater.inflate(R.layout.yourSecondLayoutFileName, null);
and then
LinearLayout llTwo = (LinearLayout) otherView .findViewById(R.id.llTwo);
llOne.addView(llTwo);

How to inflate one view with a layout

I have a layout defined in XML. It contains also:
<RelativeLayout
android:id="#+id/item"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
I would like to inflate this RelativeView with other XML layout file. I may use different layouts depending on a situation. How should I do it? I was trying different variations of
RelativeLayout item = (RelativeLayout) findViewById(R.id.item);
item.inflate(...)
But none of them worked fine.

I'm not sure I have followed your question- are you trying to attach a child view to the RelativeLayout? If so you want to do something along the lines of:
RelativeLayout item = (RelativeLayout)findViewById(R.id.item);
View child = getLayoutInflater().inflate(R.layout.child, null);
item.addView(child);

You inflate an XML resource. See the LayoutInflater doc .
If your layout is in a mylayout.xml, you would do something like:
View view;
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.mylayout, null);
RelativeLayout item = (RelativeLayout) view.findViewById(R.id.item);

Though late answer,
but would like to add that one way to get this
LayoutInflater layoutInflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.mylayout, item );
where item is the parent layout where you want to add a child layout.

It's helpful to add to this, even though it's an old post, that if the child view that is being inflated from xml is to be added to a viewgroup layout, you need to call inflate with a clue of what type of viewgroup it is going to be added to. Like:
View child = getLayoutInflater().inflate(R.layout.child, item, false);
The inflate method is quite overloaded and describes this part of the usage in the docs. I had a problem where a single view inflated from xml wasn't aligning in the parent properly until I made this type of change.

Even simpler way is to use
View child = View.inflate(context, R.layout.child, null)
item.addChild(child) //attach to your item

Try this code :
If you just want to inflate your layout :
View view = LayoutInflater.from(context).inflate(R.layout.your_xml_layout,null); // Code for inflating xml layout
RelativeLayout item = view.findViewById(R.id.item);
If you want to inflate your layout in container(parent layout) :
LinearLayout parent = findViewById(R.id.container); //parent layout.
View view = LayoutInflater.from(context).inflate(R.layout.your_xml_layout,parent,false);
RelativeLayout item = view.findViewById(R.id.item); //initialize layout & By this you can also perform any event.
parent.addView(view); //adding your inflated layout in parent layout.

layout inflation
View view = null;
LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.mylayout, null);
main.addView(view);

If you're not in an activity you can use the static from() method from the LayoutInflater class to get a LayoutInflater, or request the service from the context method getSystemService() too :
LayoutInflater i;
Context x; //Assuming here that x is a valid context, not null
i = (LayoutInflater) x.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//OR
i = LayoutInflater.from(x);
(I know it's almost 4 years ago but still worth mentioning)

AttachToRoot Set to True
Just think we specified a button in an XML layout file with its layout width and layout height set to match_parent.
<Button xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/custom_button">
</Button>
On This Buttons Click Event We Can Set Following Code to Inflate Layout on This Activity.
LayoutInflater inflater = LayoutInflater.from(getContext());
inflater.inflate(R.layout.yourlayoutname, this);
Hope this solution works for you.!

If you want to add a single view multiple time then you have to use
layoutInflaterForButton = getActivity().getLayoutInflater();
for (int noOfButton = 0; noOfButton < 5; noOfButton++) {
FrameLayout btnView = (FrameLayout) layoutInflaterForButton.inflate(R.layout.poll_button, null);
btnContainer.addView(btnView);
}
If you do like
layoutInflaterForButton = getActivity().getLayoutInflater();
FrameLayout btnView = (FrameLayout) layoutInflaterForButton.inflate(R.layout.poll_button, null);
and
for (int noOfButton = 0; noOfButton < 5; noOfButton++) {
btnContainer.addView(btnView);
}
then it will throw exception of all ready added view.

If you are you trying to attach a child view to the RelativeLayout? you can do by following
RelativeLayout item = (RelativeLayout)findViewById(R.id.item);
View child = getLayoutInflater().inflate(R.layout.child, item, true);

I had the hardest time with this error, because of my unique circumstances, but finally found a solution.
My situation: I am using a separate view (XML) which holds a WebView, then opens in an AlertDialog when I click a button in my main activity view. But somehow or another the WebView belonged to the main activity view (probably because I pull the resource from here), so right before I assigned it to my AlertDialog (as a view), I had to get the parent of my WebView, put it into a ViewGroup, then remove all the views on that ViewGroup. This worked, and my error went away.
// set up Alert Dialog box
AlertDialog.Builder alert = new AlertDialog.Builder(this);
// inflate other xml where WebView is
LayoutInflater layoutInflater = (LayoutInflater)this.getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
View v = layoutInflater.inflate(R.layout.your_webview_layout, null);
final WebView webView = (WebView) v.findViewById(R.id.your_webview_id);
// more code...
.... later on after I loaded my WebView ....
// first, remove the parent of WebView from it's old parent so can be assigned a new one.
ViewGroup vg = (ViewGroup) webView.getParent();
vg.removeAllViews();
// put WebView in Dialog box
alert.setView(webView);
alert.show();

With Kotlin, you can use:
val content = LayoutInflater.from(context).inflate(R.layout.[custom_layout_name], null)
[your_main_layout].apply {
//..
addView(content)
}

When add a layout to an Activity in Kotlin, see these steps:
Add just in Activity - One layout as a parent
Xml file of new
Layout Give the value of R.
val parent: LinearLayout =findViewById(R.id.stars)
val view =
LayoutInflater.from(applicationContext).inflate(R.layout.another, parent,false)
Where parent is not necessary, can be null But warning message will be appear
view.findViewById<ImageView>(R.id.ivTimer).setImageResource(R.drawable.t2)
Any view must be set value in this way, finally add
parent.apply { addView(view)}

I had used below snippet of code for this and it worked for me.
LinearLayout linearLayout = (LinearLayout)findViewById(R.id.item);
View child = getLayoutInflater().inflate(R.layout.child, null);
linearLayout.addView(child);

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