Hi I am developing android application in which I am creating relative layout programmatic and tried to set margin for that and Added it into linear layout which have orientation linear.
So here is my code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/screen_background"
tools:context=".ChooseChannelsFragment" >
<LinearLayout
android:id="#+id/main_outer_llt"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
>
</LinearLayout>
</RelativeLayout>
and inside fragment I am adding relative layout like this
RelativeLayout relativeLayout = new RelativeLayout(getActivity());
RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(200, 80);
relativeParams.setMargins(20, 20, 20, 20);
relativeLayout.setLayoutParams(relativeParams);
relativeLayout.setBackgroundColor(getResources().getColor(R.color.green_color));
linearLayout.addView(relativeLayout);
It create layout with given color and size but not accepting margins. Am I doing something wrong? How to do this? Need Help. Thank you.
The LayoutParams type you use on a view should actually be from its parent.
So, if you're adding a RelativeLayout to a LinearLayout, the LayoutParams you set to your RelativeLayout should actually be a LinearLayout.LayourParams, and not a RelativeLayout.LayoutParams.
As others suggested, layout_margin# is the space between the parent's # edge and your view.
# replaces "Left", "Right", "Top" or "Bottom"
Getting/setting margins worked for me with:
ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) mView.getLayoutParams();
params.topMargin += 20;
mView.requestLayout(); // important
Of course, my View was indeed a ViewGroup and the parent was a ViewGroup as well. In most cases, you should cast your layout params to the parent's View class LayoutParams (in this case it's ViewGroup and RelativeLayout)
In this case, the father is LinearLayout. So you should use:
TableLayout.LayoutParams layoutParams = new TableLayout.LayoutParams(TableLayout.LayoutParams.WRAP_CONTENT, TableLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(20, 20, 20, 20);
Related
I am adding dynamic content via Java to a relativelayout which sits inside a ScrollView:
<ScrollView
android:layout_below="#id/btn_draw_route"
android:id="#+id/layout_scroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_alignParentBottom="true">
<RelativeLayout
android:id="#+id/layout_route"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</RelativeLayout>
</ScrollView>
For some reason, the content inside the scrollview is not scrollable.
I am adding the content like this:
Button mButton = new Button(this);
mButton.setText(String.valueOf(singleStep.getId()));
mButton.setId(View.generateViewId());
mButton.setOnClickListener(new MyClickListener(singleStep.getId()));
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
lp.bottomMargin = 10;
lp.topMargin = 10;
lp.leftMargin = 10;
lp.rightMargin = 10;
lp.addRule(RelativeLayout.CENTER_HORIZONTAL);
// Add to relativeLayout
mRouteLayout.addView(mButton, lp);
I already tried calling mScrollLayout.invalidate(); after adding content, but it does not help. What I noticed is that if I do not set android:fillViewport="true" in the scrollview, its height is very low and only shows a part of the relative layout.
If I set the height of the relativeLayout to for example 2000dp, the container is scrollable, but only shows a small part of the actual content of the relativeLayout.
Edit: Might be important: The contents are added from the bottom to the top, each with an attribute like
lp.addRule(RelativeLayout.ABOVE, button2.getId(););
If I remember correctly, if you are adding your views programmatically, you have to call the requestLayout() method to refresh the view for the wrap_content to work
just do:
mRouteLayout.requestLayout();
I have this section in my layout file:
<RelativeLayout>
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView></TextView>
<TextView></TextView>
</LinearLayout>
</RelativeLayout>
My objective is to set the gravity of the items inside the linearLayout and then to add a margin to the whole LinearLayout programmatically.
This is what I have:
linearLayout_textBackground.setGravity(gravity); //where gravity is the int of the desired gravity
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
linearLayout_textBackground.setLayoutParams(layoutParams);
linearLayout_textBackground.requestLayout();
I would like to set the margin in using layoutParams but when I run the above code, I notice that my gravity value had been reset. However, if I comment out linearLayout_textBackground.setLayoutParams(layoutParams);, my gravity value are set correctly.
Why is the gravity resetting after I setLayoutParams to my layout?
When you do this :
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
You are creating new reference for your layout parameters the one you mention here will change the others not mentioned will be changed to default of android. If you want to change gravity then you need to change it after creating new params like:
Use this:
linearLayout_textBackground.setGravity(gravity);
after this:
linearLayout_textBackground.setLayoutParams(layoutParams);
or define your layout gravity in defining layoutParams.
But the recommended way of setting your gravity is inside your xml as follows:
android:layout_gravity="center"
then you dont need to do this :
linearLayout_textBackground.setGravity(gravity);
Thanks to #M.Saad Lakhan's answer, I noticed that I was creating a new reference of the parameters. So what I ended up doing is getting the actual params of the layout:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams)
linearLayout_textBackground.getLayoutParams();
This fixed the problem.
If you want to set the gravity of a View like LinearLayout programmatically, you have 2 ways:
1)
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.RIGHT;
MyLinearLayout.setLayoutParams(params);
2)
MyLinearLayout.setGravity(Gravity.RIGHT);
What is difference between these 2 ways?
It is important you know the difference.
In the first way you are setting that layout gravity of your LinearLayout. It means you are setting the position of your layout in its parent View. It is equivalent to android:layout_gravity="right" in xml layouts.
But in the second way you are setting the position of child views in your Linearlayout and it is equivalent to android:gravity="right" in xml layouts. For example if you put a TextView in your LinearLayout and its width was wrap_content, the TextView will be place in the right side of your LinearLayout.
I am trying to add TextView into a view which extends LinearLayout. When I set its width of layoutparams to fill_parent or wrap_content, the text inside TextView will display vertically such like the following.
e.g.
T
E
X
T
However, when I set the width to some fixed number, it will display normally or as I expected.
e.g. TEXT
My question is why this happens and how to solve it, i.e. how I should set programmatically so that TextView can write text horizontally without setting a fixed width to it such as setting fill_parent or wrap_content?
Here is setting of XML code of the parent ilGallery which extends LinearLayout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<com.illib.ilgallery.view.ILGallery
android:id="#+id/galleryLayout"
android:layout_height="fill_parent"
android:layout_width="fill_parent"/>
</LinearLayout>
The following is the code how i initialize the children inside it:
ilViewPager = new ILViewPager(context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
ilViewPager.setLayoutParams(params);
ilgallery = this;
//initialize default header and footer view
LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
headerView = new TextView(context);
headerView.setLayoutParams(params2);
((TextView)headerView).setTextSize(TypedValue.COMPLEX_UNIT_PX,40);
((TextView)headerView).setText("hello");
footerView = new TextView(context);
footerView.setLayoutParams(params2);
((TextView)footerView).setTextSize(TypedValue.COMPLEX_UNIT_PX,40);
((TextView)footerView).setText("hello2");
There appears to be only a single item inside your LinearLayout. Please set the orientation of the LinearLayout to "horizontal", like this:
android:orientation="horizontal"
Also, whenever possible instead of creating new LayoutParams objects from scratch, you should get the LayoutParams from the current layout and modify that, like this:
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)ilViewPager.getLayoutParams();
lp.<change-any-values>;
ilViewPager.setLayoutParams(lp);
I went through several links yet i am not able to find if it is possible to set other attributes of relative layout, like android:gravity,android:orientation through java code.
I want to change the positions of the some of the views through java code and not through xml.
e.g, i want to set these attributes through java code for a particular view. android:gravity="center_vertical" android:orientation="vertical"
how can i do so? please help.
as Daan said you can use Layout params for relative layout in android
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.alignWithParent = true;
params.bottomMargin = 5;
params.height = 50;
params.leftMargin = 50;
But as you said you want to set following attributes for particular view, you cannot assign these attributes to RelativeLayout as these are belongs to LinearLayout and other views
android:gravity="center_vertical" android:orientation="vertical"
For setting gravity for any view please follow the code
tv = (TextView)findViewById(R.id.tv01);
tv.setGravity(Gravity.CENTER_VERTICAL);
You cannot set Orientation of any view.. instead you can set orientation to LinearLayout
like this
LinearLayout linearLayout = new LinearLayout(this);
linearLayout.setOrientation(LinearLayout.VERTICAL);
Hope this will help you
Within a relative layout you have to use other layout params:
Layout params within relative layout