android layout height 50 of the screen size

Question

I just implemented a ListView inside a LinearLayout  but I need to define the height of the LinearLayout  it has to be 50  of the screen height     lt LinearLayout     android id    id widget34      android layout width  300px      android layout height  235px      android orientation  vertical      android layout below    id tv scanning for      android layout centerHorizontal  true  gt        lt ListView         android id    id lv events          android textSize  18sp                   android cacheColorHint   00000000          android layout width  fill parent          android layout height  wrap content          android layout below    id tv scanning for          android layout centerHorizontal  true  gt       lt  ListView gt    lt  LinearLayout gt    Is that possible   I did something similar for a button and an EditText  but doesn t seem to work on Layouts   This is my Code         capture the size of the devices screen     Display display   getWindowManager   getDefaultDisplay        double width   display getWidth           my EditText will be smaller than full screen  80               double doubleSize    width 5  4      int editTextSize    int  doubleSize         define the EditText      userName    EditText  this findViewById R id userName       password    EditText  this findViewById R id password          set the size     userName setWidth editTextSize       password setWidth editTextSize

User · Answer

To achieve this feat  define a outer linear layout with a weightSum  amount of weight to distribute    it defines the maximum weight sum  If unspecified  the sum is computed by adding the layout weight of all of the children  This can be used for instance to give a single child 50  of the total available space by giving it a layout weight of 0 5 and setting the weightSum to 1 0 Another example would be set weightSum 2  and if the two children set layout weight 1 then each would get 50  of the available space   WeightSum is dependent on the amount of children in the parent layout

User · Answer

This kind of worked for me  Though FAB doesn t float independently  but now it isn t getting pushed down   Observe the weights given inside the LinearLayout   lt LinearLayout             android layout width  match parent              android layout height  wrap content              android orientation  vertical              android id    id andsanddkasd  gt                lt android support v7 widget RecyclerView                 android id    id sharedResourcesRecyclerView                  android layout width  match parent                  android layout height  0dp                  android layout weight  4                    gt                lt android support design widget FloatingActionButton                 android id    id fab                  android layout width  wrap content                  android layout height  0dp                  android layout gravity  bottom right                  android src   android drawable ic input add                  android layout weight  1   gt            lt  LinearLayout gt    Hope this helps

User · Answer

This is my android layout height 50  activity    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  fill parent      android layout height  fill parent      android orientation  vertical   gt        lt LinearLayout         android id    id alipay login          style   style loginType          android background   27b   gt       lt  LinearLayout gt        lt LinearLayout         android id    id taobao login          style   style loginType          android background   ed6d00   gt       lt  LinearLayout gt    lt  LinearLayout gt    style    lt style name  loginType  gt       lt item name  android layout width  gt match parent lt  item gt       lt item name  android layout height  gt match parent lt  item gt       lt item name  android layout weight  gt 0 5 lt  item gt       lt item name  android orientation  gt vertical lt  item gt   lt  style gt

User · Answer

You should do something like that    lt LinearLayout     android id    id widget34      android layout width  fill parent      android layout height  fill parent      android orientation  vertical      android layout below    id tv scanning for      android layout centerHorizontal  true  gt        lt ListView         android id    id lv events          android textSize  18sp                   android cacheColorHint   00000000          android layout height  1          android layout width  fill parent          android layout weight  0dp          android layout below    id tv scanning for          android layout centerHorizontal  true            gt    lt  LinearLayout gt    Also use dp instead px or read about it  here

User · Answer

it s so easy if you want divide your screen two part vertically   top30    bottom70     lt LinearLayout             android id    id LinearLayoutTop              android orientation  vertical              android layout width  fill parent              android layout height  fill parent              android layout weight  2  gt         lt  LinearLayout gt        lt LinearLayout             android id    id LinearLayoutBottom              android orientation  vertical              android layout width  fill parent              android layout height  fill parent              android layout weight  1  gt         lt  LinearLayout gt

User · Answer

Set its layout height  0dp    add a blank View beneath it  or blank ImageView or just a FrameLayout  with a layout height also equal to 0dp  and set both Views to have a layout weight  1   This will stretch each View equally as it fills the screen  Since both have the same weight  each will take 50  of the screen    See adamp s comment for why that works and other really helpful tidbits

User · Answer

To make sure the height of a view is 50  of the screen then we can create two sub LinearLayouts in a LinearLayout  Each of the child LinearLayout should have  android layout weight  of 0 5 to cover half the screen  the parent LinearLAyout should have  android orientation  set to vertical         here is code for your reference     this code contains two buttons of height half the screen   lt LinearLayout  android orientation  vertical  android layout height  match parent  gt    lt LinearLayout      android layout weight  0 5      android layout width  fill parent      android layout height  wrap content      android orientation  horizontal  gt        lt Button         android padding  10dp          android layout weight  0 5          android layout width  wrap content          android layout height  fill parent          android text  button1          android id    id button1          android layout alignParentTop  true          android layout alignParentLeft  true          android layout alignParentStart  true          android layout alignParentBottom  true            gt        lt Button         android padding  10dp          android layout weight  0 5          android layout width  wrap content          android layout height  fill parent          android text  button2          android id    id button2          android layout alignParentTop  true          android layout alignParentRight  true          android layout alignParentEnd  true          android layout alignParentBottom  true            gt        lt  LinearLayout gt    lt LinearLayout      android layout weight  0 5      android layout width  fill parent      android layout height  wrap content      android orientation  horizontal  gt         lt  LinearLayout gt      lt  LinearLayout gt

User · Answer

You can use android weightSum  2  on the parent layout combined with android layout height  1  on the child layout               lt LinearLayout                 android layout height  match parent                  android layout width  wrap content                  android weightSum  2                   gt                    lt ImageView                     android layout height  1                      android layout width  wrap content    gt                lt  LinearLayout gt

User · Answer

best way is use   layout height  0dp  layout weight  0 5   for example   lt WebView     android id    id wvHelp      android layout width  match parent      android layout height  0dp      android layout weight  0 5    gt    lt TextView     android id    id txtTEMP      android layout width  match parent      android layout height  0dp      android layout weight  0 5      android text  TextView    gt    WebView TextView have 50  of the screen height

User · Answer

This is easy to do in xml  Set your top container to be a LinearLayout and set the orientation attribute as you wish  Then inside of that place two linearlayouts that both have  fill parent  on width and height  Finally  set the weigth attribute of those two linearlayouts to 1

[android] android:layout_height 50% of the screen size

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