I am very new to android app development.In the below code, I am using TableLayout to place my contents but getting some extra spaces in table row. Please suggest how to remove it.
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="DataStage 8.5"
android:id="#+id/textViewDS8.5"
android:layout_column="0"
android:textStyle="bold|italic"
android:textColor="#090909"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</TableRow>
In place of using TableRow you can use gridlayout
GridLayout (not GridView) how to stretch all children evenly
this is almost the similar or you can use linear layout and set its orientation horizantal and set the weight of the text view 0.5 in this way both the text will cover half the screen and no free space
Related
I am trying to rework one of my layouts using GridLayout and a bit stuck with one of the problems. Here is what I have now:
And this is my layout:
<GridLayout
style="#style/Widget.Card"
android:layout_width="match_parent"
android:layout_height="#dimen/card_height"
android:background="#color/news_card_background"
android:clipChildren="false"
android:clipToPadding="false"
android:columnCount="3"
android:rowCount="2" >
<ImageView
android:id="#+id/thumbnail"
android:layout_width="#dimen/card_thumbnail_width"
android:layout_height="match_parent"
android:layout_rowSpan="2"
android:background="#drawable/news_card_thumbnail_background"
android:contentDescription="#string/thumbnail"
android:cropToPadding="true"
android:scaleType="centerCrop"
android:visibility="visible" />
<com.inrix.twc.view.RobotoTextView
android:id="#+id/title"
style="#style/TextAppearenceNewsTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/news_title_horizontal_margin"
android:layout_marginRight="#dimen/news_title_horizontal_margin"
android:text="Title" />
<ImageView
android:id="#+id/icon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="right"
android:layout_rowSpan="2"
android:src="#drawable/audio_mrss"
tools:ignore="ContentDescription" />
<com.inrix.twc.view.RobotoTextView
android:id="#+id/footer"
style="#style/TextAppearenceNewsFooter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_marginLeft="#dimen/news_description_horizontal_margin"
android:layout_marginRight="#dimen/news_description_horizontal_margin"
android:text="description" />
</GridLayout>
But when one of the text views goes very long, it pushes my last column out of the screen:
The question is - how do I restrict my text to go beyond row's bounds, so my icon always stays right-aligned. So basically I'm trying to mimic RelativeLayout's toLeftOf attribute.
I realize I can easily do that with RelativeLayout, but it doesn't quite work for me because of other reasons. I hope it is possible to do with GridLayout
Thats not the target of gridlayout. I don't think that is even (easily) possible. Blockqoute from GridLayout limitations.
GridLayout does not provide support for the principle of weight, as defined in weight. In general, it is not therefore possible to configure a GridLayout to distribute excess space between multiple components.
Some common use-cases may nevertheless be accommodated as follows. To place equal amounts of space around a component in a cell group; use CENTER alignment (or gravity). For complete control over excess space distribution in a row or column; use a LinearLayout subview to hold the components in the associated cell group. When using either of these techniques, bear in mind that cell groups may be defined to overlap.
TextView needs weight to define his own size on the screen (using wrap content).
You can try to use relative layout or build a tree of linearlayout like this:
LinearLayout horizontal
ImageView #thumbnail
LinearLayout vertical weight 1
TextView #title
TextView #footer
ImageView #icon
I know that you can use weight parameters for linear layout in order to make two fields align nicely. What I want to do is I want to make sure that left half of the screen is used by one text field and other half is used by other text field (I am talking about width).
How to do so?
Use a "hidden view", with no height or width, in the center and put the text views on either side. Use parent align to set left and right.
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<View android:id="#+id/dummy"
android:layout_height="0dp"
android:layout_width="0dp"
android:layout_centerInParent="true"/>
<TextView
android:layout_alignRight="#id/dummy"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_alignParentLeft="true"/>
<TextView
android:layout_alignLeft="#id/dummy"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"/>
</RelativeLayout>
Can you calculate width dynamically? Maybe you could use 2 RelativeLayouts in a horizontal LinearLayout?
This is not possible with RelativeLayour as a parent. You need to wrap these TextViews inside a LinearLayout and set the widths with layout weight.
I imagine this should be a fairly easy one to answer, if you understand XML Layouts better than I do that is. I don't seem to get what I was thinking I should when using the match_parent layout_height.
I have a LinearLayout root element with android:orientation="vertical". Inside this LinearLayout I want three elements:
- TextView
- ListView
- TextView
For both the TextViews I set android:layout_height="wrap_content" so that they will be only as tall as is necessary to display their contents. The thing is, I want the one TextView to sit at the top of the form, the other one to sit at the bottom of the form while the ListView fills up whatever space is available on the form. So here is what my xml layout looks like:
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text="Top TextView" />
<ListView
android:id="#+id/listView_Species"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text="Bottom TextView" />
But it doesn't work. Here's what I get. I've selected the ListView so that it will be highlighted. Notice how it extends all the way to the bottom of the form, pushing the bottom TextView off the form.
When I change the layout_height property of the ListView to some fixed value, like 180dp, this is what the form looks like. I'm just posting this to prove that the bottom TextView is there but I still don't know how to get it to be fixed to the bottom of the screen while the ListView takes up whatever space remains, but in between the two TextViews.
Thanks in advance.
While the other answers try to fix your problem (which they don't actually--they suggest you do something that looks similar but may or may not look good on different devices), no one has filled in the gaps in your knowledge of LinearLayouts and match_parent. And these gaps are very common--Google's documentation is still far below stellar.
First, how do Views work within a LinearLayout? Let's go through the process of drawing a LinearLayout, using orientation="vertical" for simplicity.
Examine the height of the first child of the LinearLayout (LL for short). If the height is match_parent or fill_parent (old name for the same thing) then the height of the View is stretched to fill the entire viewing area. If the height is wrap_content, then measure the vertical space the View takes and use that space for the View. If the height is a non-zero number, use exactly that many pixels for the View's height (may clip if too small). If the height is 0 see below.
Put the next view below the view in 1. Check its height and act accordingly.
Continue for all the Views. If a View is pushed off the bottom, go ahead and stop calculating because no one will see it or any succeeding Views (assuming no ScrollView).
If the height of a View is 0, check it's gravity. This requires a second pass, storing the gravity of all the views and then allocating their heights proportionally. As you can guess, the second pass doubles the time layout takes, which isn't significant for simple layouts.
Explanation of your example: The first child of the LL (the first TextView) is measured and takes a certain amount of pixels. Then your ListView takes all the remaining space (via match_parent). And then your second TextView is not drawn at all as it's off the bottom of the screen. Which is pretty much what you observed, but now you understand why.
Solution: Use RelativeLayout. Works perfectly in this case.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/top_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:textSize="30sp"
android:text="Top TextView" />
<TextView
android:id="#+id/bottom_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:textSize="30sp"
android:text="Bottom TextView" />
<ListView
android:id="#+id/listView_Species"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/top_tv"
android:layout_above="#id/bottom_tv"
/>
</RelativeLayout>
The RelativeLayout tells the layout inflater to draw the first TextView at the top, then draw the second TextView at the bottom, and then fill the rest of the space with your ListView. I believe this is exactly what you want.
Welcome to Android. You'll be using this pattern a LOT!
Change the ListView height to 0dp and add weight=1
i.e.:
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text="Top TextView" />
<ListView
android:id="#+id/listView_Species"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text="Bottom TextView" />
use android:layout_weight to define weights to your widgets inside the outermost layout. Declare their height as 0dp and then define android:layout_weight to each one of them .
Total weigh sum of the three of them should be 1. According to your need you can deine 0.1 weight to both top and bottom TextView's and define 0.8 to ListView.
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight = "0.1"
android:textSize="30sp"
android:text="Top TextView" />
<ListView
android:id="#+id/listView_Species"
android:layout_width="match_parent"
android:layout_weight = "0.8"
android:layout_height="0dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:textSize="30sp"
android:layout_weight = "0.1"
android:text="Bottom TextView" />
For many "header" TextViews across the pages I'm designing for a program, I would like them to be the parent.Width / 2 then properly aligned. While that would be fairly easy to code in the Java, I am attempting to do as much as possible in the XML layouts to avoid XML-Java code intersections until the last little bits (button presses, finish page, etc).
Do I have to go through each page and calculate every item's specific width myself or is there a way to put something along the lines of "fill_parent / 2"?
EDIT: Forgot to mention what is likely a key note - almost everything I am doing is in RelativeLayouts, I have very little use for LinearLayouts in this project.
If you have a LinearLayout that is flush to the left and right, you can do the following:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:weightSum="2"
android:gravity="left"
android:orientation="horizontal">
<TextView
android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:text="I take up half the width!!!1" />
</LinearLayout>
By setting the weightSum on the parent, you're saying that the weights of the children should equal that amount. By setting the single child's weight to half of that, it'll take up half the space. Make sure to set the width of the child to 0 so it knows to use the weight value to calculate its space relative to its parent.
Then, you can align it however you'd like by setting gravity on the parent LinearLayout.
Use a tableview with two columns where each column is stretched and has a text view. Then hide the second textview
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="1">
<TableRow>
<TextView android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Set Item Name "/>
<TextView android:id="#+id/hiddenTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="invisible"/>
</TableRow>
</TableLayout>
Say I have a list of Strings with the elements:
"One",
"Two",
"Three",
"Four"
I want to center them in the middle of the screen but I want to do it in a way that the start of each word is next to each other.
Like this:
One
Two
Three
Four
Considering that the font probably has different length per character, how do I do this best in Android?
I'm not sure how your application is behaving and if a ListView is strictly required, but the effect you desire can be achieved using TableLayout and TableRows. The TableLayout will line up the elements in each column for each row as you have described.
Having said that, TableLayout does not support having lines between the rows or gridlines (although I have seem some clever hacks involving changing the background colour of the TableRow to black, and then changing the padding and background colour of the View objects in the TableRow to white to get a black divider line - but that doesn't always work depending on your View objects).
I'm in a similar pickle, and that was the first avenue I examined. It didn't have a solution for my situation, but this might work for you. And if you do find a way of lining up the text in a List, I'd love to hear about it.
EDIT:
I also feel it is worth mentioning (based on how the conversation is progressing) that you can also set row.setOnClickListener() and make an entire row clickable in a TableView. Once you wrap it in a ScrollView, it's pretty list-like.
you can set the gravity at the elements you want to be center and for detail
android:gravity="center_horizontal"
Wrap your ListView in a LinearLayout with layout_gravity="center_horizontal" or
nvm: that won't work obviously..
So wait.. You want a list, where each line is clickable for the whole width of the screen, and you want to justify all lines to left, and ALSO center all of the justified text without breaking justification?
It sounds like you want to place your items within a parent with layout_width="wrap_content" and center the whole parent.
Something like this, perhaps?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView android:text="Content above..."
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<TextView android:text="One"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView android:text="Two"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView android:text="Three"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<TextView android:text="Content below..."
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Remember the difference between gravity and layout_gravity. The gravity attribute refers to the view's content. layout_gravity (and all other attributes prefixed with layout_) refers to the view's layout within its parent.
Edit: If you're looking to format ListView items similarly, try something like this as your list item layout with the ListView itself using layout_width="fill_parent" and layout_height="fill_parent":
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="?android:attr/listPreferredItemHeight"
android:weightSum="2"
android:gravity="center">
<TextView android:id="#+id/text"
android:layout_weight="1"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
Change the content of the TextView with id text in each list item in the usual way. The minHeight setting pulled from the current theme will make sure it stays a good size for touch.
The uniform centering in this case is handled by a combination of the weightSum and gravity on the LinearLayout and the layout_weight on the TextView. The TextView's weight divided by its parent's weightSum will determine the percentage of horizontal space the LinearLayout will give it. In the example above it will get 1/2 the available horizontal space, but centered.
Since ListView never knows the content of list items that are not currently onscreen there is no way to have it measure the text of every item in your adapter to center the content perfectly. You will have to approximate it using a list item layout like the example above.