How do you enable 2 or more columns on a LinearLayout while still preserving the capability to use addView(view, position) to add views at a given position.
Nested layouts aren't an option because in that case, each inner layout will have it's own indexes. I want to be able to use the addView method on the main layout such that the view goes to the appropriate column.
I think you should use tablelayout instead of linearlayout
I'd use 2 separate LinearLayouts, possibly within an outer LinearLayout, and have one LinearLayout be the left column, and the other be the right column. These 2 new LinearLayouts will both have equal android:layout_weight so that they have equal widths in the outer layout. You can then choose whether to add the new view to the left column or the right column by its ID.
Related
I'm inflating views inside a linearlayout dynamically, however once the linear layout reaches the end of the first row, it cuts off the rest and doesn't start on the second row.
for(int a = 0; a < mSkills.get(i).size(); a++){
View singleSkill = LayoutInflater.from(mContext)
.inflate(R.layout.singleskill, holder.mSkillLayout, false);
TextView skillText = singleSkill.findViewById(R.id.singleskilltext);
skillText.setText(mSkills.get(i).get(a));
holder.mSkillLayout.addView(skillText);
}
For the linear layout I have it set to wrap_content for the height:
<LinearLayout
android:id="#+id/ll_skills"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#+id/tv_description"
android:layout_margin="16dp"/>
I've tried setting it to a defined height e.g 300dp however that doesn't work either.
How can I make the layout start on the second row, once the first is full?
Linear Layout can either fill views horizontally or vertically so the 2nd row you are expecting cant to be done with linear layout only. you can try a horizontal scroll view for that to scroll horizontally. For the exact view-like flow that you described, you can use this 3rd party https://github.com/nex3z/FlowLayout
It can manage the flow of your dynamically inflated view such as if there is no space in the first line then it will put the next view in the second line.
also, you can use material design library chips https://material.io/components/chips/#usage
LinearLayout works exactly how it has to be because you specify it as horizontal. For such behavior, you need RecyclerView With GridLayoutManager or create your own layout;).
Actually it's doing exactly as it should be, LinearLayout is Linear!, and place its subviews in a single horizontal or vertical row.
My advice to you is that create dynamic horizontal LinearLayout as you already doing with TextViews. and put every 3 or 4 textviews (depending on screen size) inside it.
and put all LinearLayouts inside one vertical LinearLayout...
Of course in your case, it's not a good idea, the best thing you can do is to use recycler view. but I consider you have problem with that.
Ok so imagine a situation where you have the main layout as LinearLayout (which supports layout_weight) and inside it you have nested RelativeLayout (which does not support layout_weight).
Now since the RelativeLayout is nested inside LinearLayout, will it be able to use layout_weight ? And if the case was reversed (Linear inside Relative), will LinearLayout be able to use layout_below, layout_toParentLeft, etc ?
Now since the RelativeLayout is nested inside LinearLayout, will it be able to use layout_weight ?
No. Since RelativeLayout is nested inside LinearLayout it can be given a weight to be weighted inside the LinearLayout but it does not inherit the property of weightSum to hand out to children.
And if the case was reversed (Linear inside Relative), will LinearLayout be able to use layout_below, layout_toParentLeft, etc ?
Yes, you are inside of a RelativeLayout so any child can be given those properties. However, any child inside of that nested LinearLayout can not use the properties of RelativeLayout as in your example.
WeighSum Docs
a number greater than 0.0f, or a number lower than or equals to 0.0f
if the weight sum should be computed from the children's
layout_weight"
android:weightSUme="aNumber" can be used to "sum" the weight of the children. If all the childrens sums will add up to 1 then you don't need this property. As I recently learned from #RomainGuy through a discussion with #Squonk, it is really only needed if they won't equal 1 and you want some empty space in your layout. Otherwise, the cpu will determine what the weightSum will be.
The answer to your question is not very complicated. I can synthesize it in two letters: NO
Is there a way to create an array containing actual instances of views. For example, if I have one LinearLayout called Container that has within it 3 other LinearLayouts with the same Tag attribute and I wanted to get a list containing all 3 LinearLayouts so I can loop through and handle each.
Tried:
LinearLayout[] layouts = (LinearLayout[]) Container.FindViewWithTag(tag);
and
List<LinearLayout> layouts = (List<LinearLayout>) Container.FindViewWithTag(tag);
and
foreach(LinearLayout layouts in Container.FindViewWithTag(tag))
None of these have been acceptable to Android so far. Another acceptable way to handle my situation would be to just be able to assign each LinearLayout a Parent. But I haven't found a way to programatically set a view's parent, only how to get a view's parent.
What I have understood from your question that you want the child of Linear Layout. Yes, you can get the child of linear layout by container.getChild(index)
for(int i=0;i<container.getChildCount();i++){
View child=container.getChildAt(i);
//your processing....
}
I am trying to create a table row element where the first line contains a title followed by an ImageView that should be all of the way to the right. The TextView should fill the entire width of the phone except for the ImageView at the end.
The solution depends on some details of the circumstances.
If all the rows have the same format
If all the rows have the same column layout, then set android:stretchColumns="0" on the TableLayout. This will make the first column (index 0) stretch to fill any remaining space.
If the header has a different format from the remaining rows
If you have more columns or need a different column layout for the rest of the rows, then you need to do something different. I don't believe any single item can span multiple columns.
If only the positioning is important and you don't really need to span across multiple rows, you can use the android:layout_column attribute on each of the header items. The column number is 0-based, so the first column is 0. The Eclipse layout builder doesn't seem to present this attribute, but it will handle the attribute if you type it into the xml.
If you can't fit your elements inside the same columns the rest of the table uses, then the header doesn't belong in a TableRow. As suggested in another answer, you can use a RelativeLayout instead of the TableRow. Alternately, you could move the header outside of the table.
First, use a RelativeLayout for your row. Use the typical ImageView, give it an id, and use the XML attribute android:layout_alignParentRight="true". Next, use the TextView, use android:layout_toLeftOf="#id/myid" and make sure it's width is "fill_parent".
edit: code tags
On an Android layout, I'd like to have a set of rows, each with two TextViews. The leftmost column of TextViews should be right-aligned, just left of an imaginary centerline down the screen. The rightmost column should be left-aligned.
Examples of this can be seen at http://stuff.greenberg.org/ScopeCalc.htm
What's the best layout to use?
IMO, TableLayout would be a logical choice with appropriate use of colspan/rowspan.
You can also do this using LinearLayout, with the two sub-views of each row each getting 50% of the width.
Using GridLayout you can apply columnspan and rowspan properties to the views inside the grid.