I have a pretty complex layout defined in xml file , now I want to add this layout as a view using addView or something else.
As layout is pretty much complex , its pretty cumbersome process to write the code for layout and then add it as a view. So is there anyway to load layout resource and add it as a view.
I want to add the layout into WebView
Use
LayoutInflater factory = LayoutInflater.from(this);
View myView = factory.inflate(R.layout.my_layout_id, null);
then use addView(myView)
You can also reduce this to one line of code;
View view = View.inflate(getActivity, R.layout.my_layout,null);
then add to your view.
If your view is a ViewGroup (layout)
You can use InflaterService.inflate(id, ViewGroup) and set the ViewGroup, it will set the current child(s) with the content of your xml.
Related
I am creating custom layout (extends FrameLayout). I have a bunch of view defined in xml(it doesn't matter now).
What I need to do. My custom layout has custom defined attributes, let's assume that it named footer_banner_type.
I have different Banners classes some of them I quite different from one another, so I cannot place some base banner in xml. So I have to add some banner based on attribute value.
I am extending FrameLayout . I am newbie and this is my first custom layout.
I don't know how to improve performance.
As I understand Layout iterating and inflating all child views. But if I need to add view in runtime.I don't want to make layout reiterate view hierarchy, because it will be performance issue.
My question is how to implement my task in better way.
//First create your view:
View wonderfulView = new View(this.getApplicationContext());
//Then, create its LayoutParams
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1);
//Set those layout params in your view
wonderfulView.setLayoutParams(params);
//finaly, add the view to your ViewGroup
yourLayout.addView(wonderfulView);
That's it.
If you want to change the view container, you'll have to remove it form the previous parent like this:
View movingThing = ((YourLayoutClass)findViewById(R.id.currentContainer)).getChildAt(WhereYourViewis);
((YourLayoutClass)findViewById(R.id.currentContainer)).removeView(movingThing);
((YourLayoutClass)findViewById(R.id.newContainer)).addView(movingThing);
I cannot seem to find a way to get this ViewGroup. Not sure if there are any standard ways to get ViewGroups.
What I want to accomplish is to dynamically add a full screen overlay view to any Layout at run time, and in order to do this, I always need to get the root ViewGroup. Is this the right way to do this?
Try using
ViewGroup view = (ViewGroup) findViewById(android.R.id.content);
Every layout has this ViewGroup as parent.
getWindow().getDecorView().getRootView();
set this view directly
Works for me
getWindow().getDecorView().findViewById(android.R.id.content);
I have created some xml layouts. Now I am creating a custom layout (in my java file) with some elements and want to add the previously created layout(xml layouts). How can I do that?
You can use LayoutInflater to inlate layouts. And add inflated view to your custom view by addView() method
For ex:
LayoutInflater mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewGroup viewTobeLoaded = mInflater.inflate(R.layout.ilan_list_item, null);
yourView.addView(viewTobeLoaded);
Hope helps
Use <include> tag in your new layout. See docs here.
I am new to android development and keep coming across references to Inflating views from a layout xml file. I googled and searched the development guide but still wasn't able to pick up a sense for what it means. If someone could provide a very simple example, it'd be much appreciated.
When you write an XML layout, it will be inflated by the Android OS which basically means that it will be rendered by creating view object in memory. Let's call that implicit inflation (the OS will inflate the view for you). For instance:
class Name extends Activity{
public void onCreate(){
// the OS will inflate the your_layout.xml
// file and use it for this activity
setContentView(R.layout.your_layout);
}
}
You can also inflate views explicitly by using the LayoutInflater. In that case you have to:
Get an instance of the LayoutInflater
Specify the XML to inflate
Use the returned View
Set the content view with returned view (above)
For instance:
LayoutInflater inflater = LayoutInflater.from(YourActivity.this); // 1
View theInflatedView = inflater.inflate(R.layout.your_layout, null); // 2 and 3
setContentView(theInflatedView) // 4
"Inflating" a view means taking the layout XML and parsing it to create the view and viewgroup objects from the elements and their attributes specified within, and then adding the hierarchy of those views and viewgroups to the parent ViewGroup. When you call setContentView(), it attaches the views it creates from reading the XML to the activity. You can also use LayoutInflater to add views to another ViewGroup, which can be a useful tool in a lot of circumstances.
Inflating is the process of adding a view (.xml) to activity on runtime. When we create a listView we inflate each of its items dynamically. If we want to create a ViewGroup with multiple views like buttons and textview, we can create it like so:
Button but = new Button();
but.setText ="button text";
but.background ...
but.leftDrawable.. and so on...
TextView txt = new TextView();
txt.setText ="button text";
txt.background ... and so on...
Then we have to create a layout where we can add above views:
RelativeLayout rel = new RelativeLayout();
rel.addView(but);
And now if we want to add a button in the right-corner and a textview on the bottom, we have to do a lot of work. First by instantiating the view properties and then applying multiple constraints. This is time consuming.
Android makes it easy for us to create a simple .xml and design its style and attributes in xml and then simply inflate it wherever we need it without the pain of setting constraints programatically.
LayoutInflater inflater =
(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View menuLayout = inflater.inflate(R.layout.your_menu_layout, mainLayout, true);
//now add menuLayout to wherever you want to add like
(RelativeLayout)findViewById(R.id.relative).addView(menuLayout);
A layman definition for inflation might be to convert the XML code to Java code. Just a way to understand, e.g., if we have a tag in XML, OS has to create a corresponding Java object in memory, so inflatter reads the XMLtags, and creates the corresponding objects in Java.
I think here "inflating a view" means fetching the layout.xml file drawing a view specified in that xml file and POPULATING ( = inflating ) the parent viewGroup with the created View.
Because we make UI into XML but view objects is what we display so we somehow need to convert xml into view objects so inflating means we are converting xml into view objects so that it can be displayed, for this we need a service called layout inflator service and give it an xml and it will be convert for you.
In the iOS UIKit universe, this means getting the reference to the .Xib (which is XML, just like android) file and adding it to the current ViewController's view hierarchy.
Can anybody please tell What Inflator is and how it is being used in an Android application?
I don't know the exact use of it and Why it is being used.
My preferred way to handle inflation:
//First get our inflater ready, you'll need the application/activity context for this
LayoutInflater mInflater;
mInflater = LayoutInflater.from(mContext);
//Inflate the view from xml
View newView = mInflater.inflate(R.layout.my_new_layout, null);
//Then you'll want to add it to an existing layout object
mMainLayout.add(newView);
//Or perhaps just set it as the main view (though this method can also
// inflate the XML for you if you give it the resource id directly)
setContentView(newView);
Basically, you use it to inflate existing xml layouts at runtime. Usually you go ahead and insert those new views into previously defined ViewGroups or List objects.
Not quite sure what you mean, but if its related with inflating views, its used to load layout xml files into your application. e.g by
View myWelcome = View.inflate(this, R.layout.welcome, null);
Its easier and consider best practice to have you view definition inside layout xml files, instead of creating your views fully by code.
layout inflator is used to return a java object of your complete layout
suppose you have a layout xml file in which the root element is relative layout and it contains a imageview and textview then using layout inflator you can return a view object that refers to entire layout.
this basically is used in list view and grid view to plug into them a layout object of single row or element which is to be repeated.
you were asking for use of Inflator..
basically when you want to use two xml files in one java class ,inflator is used and its code is simple which is given below..
TextView text;
View layout;
LayoutInflater inflator=getLayoutInflater();
layout =inflator.inflate(R.layout.new_xml_that you want to use in that java class,null);
text=(TextView)layout.findViewById(R.id.text);
text.setText("progressing");
here i use textview,this is present in next xml with id=text
thats it..
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thanks