How to inflate View on my layout? - android

How to inflate View on layout, where all my ui elements which are on layout should be visible.
Am trying this lines but it is not working am not able to see my background image, button and other images.
MyView view1=new MyView(this);
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view1= (MyView) inflater.inflate(R.layout.main, null);
Please help.. Thanks in advance.


For what you are doing, use
setContentView(R.layout.main);
The reason for not getting your view after inflating is that you need to add that View in the current View somewhere. Currently your inflated view is orphaned.


this usually works...
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view1= inflater.inflate(R.layout.main, null);
or
LayoutInflater inflater = LayoutInflater.from(getApplicationContext);
View view1= inflater.inflate(R.layout.main, null);
and then add this view to the contentView.
Updated:
Assuming you have need to draw a line in your main.xml, let me give you this suggestion. instead of drawing line at runtime by extending View class, create a View in xml like this
<View android:layout_width = "fill_parent"
android:layout_height = "2dp" //assuming you want line of 2dp thickness
android:background= "#android:color/black"/> // define your desired color here
hope it helps..


This worked finally.
getWindow().addContentView(view1,
new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT));

Related

Android: Dynamically inserting view results in change in colors of form widgets

In my Android activity I attempt to dynamically add a view inside my existing view.
I do so with the following code:
LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = vi.inflate(R.layout.newactivity_name, null);
View insertPoint = findViewById(R.id.aVerticalLinearLayout);
((ViewGroup) insertPoint).addView(v, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
Everything seems to work fine except somehow the colors/theme get messed up
making all the form widgets seem extremely faded.
How I expect it to look:
How it is displayed in the xml graphic display
How it looks:
how it appears on the emulator after being inflated (ignore the text:hint being different)
Any ideas?
Or could you tell me how I can make the calenderView and DatePicker look normal by manually
setting the colors?

You should set the parent when inflating the view so that it gets the styling and theme from the parent view.
LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View insertPoint = findViewById(R.id.aVerticalLinearLayout);
View v = vi.inflate(R.layout.newactivity_name, insertPoint); <-----
((ViewGroup) insertPoint).addView(v, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

Layout params of inflated view are ignored

I inflated a view and added it to my layout :
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View vi = inflater.inflate(R.layout.to_add,null,false);
DyL.addView(vi);
and I want to change the view parameter dynamically (height) but getLayoutParams doesn't work, I always have a null result .So how can I do this? I tried all the solutions I found on the net with no success.
Thank you.

try to set the parent view,
View vi = inflater.inflate(R.layout.to_add, DyL, false);
where DyL is you parent view

Use your parent view in argument when doesn't require parent.add(vi)
View vi = inflater.inflate(R.layout.to_add, parent , false);

Android: Changing the height of root view of a layout programmatically

I'm new to Android. Can anyone tell me how to change the height of RootView of a layout programmatically in Android? The code I've tried is given below
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.sample, null);
view.getRootView().getLayoutParams().height = value;
After executing this I'm getting a NullPointerException on the above line.
Can anyone help me? Thanks in advance.

The View returned by the inflate call is the root View, therefore this should work:
View view = inflater.inflate(R.layout.sample, null);
view.setLayoutParams(new ListView.LayoutParams(LayoutParams.MATCH_PARENT,<height>));
If you were to provide a ViewGroup to inflate into like this:
View view = inflater.inflate(R.layout.sample, containerForTheInflatedView);
Then view would be the ViewGroup, not the root View that you want.

Cast XML layout as view in android before setContentView

I want to cast multiple XML layouts as views. Because of a change request I need to use a ViewSwitcher. So I have to cast the XML layout to Views before setContentView.
I always get a NullPointerException. I tried:
view = (View) findViewById(R.id.viewgroup_id);
view = (RelativeLayout) findViewById(R.id.viewgroup_id);
view = (View) findViewById(R.layout.xml_layout);
view = (View) getResources().getLayout(R.layout.xml_layout);

Try using LayoutInflater. Use this code inside your activity code-
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.your_layout, null);

You need to inflate layouts for that
Check this link

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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