Develop Reference

Android Layout Weight Exactly Twice Of Others

I would like to simply divide a Linear Layout to 3 piece. I did something as in the code below. If I change the weight of second inner layout anything else than 2, it works. But if I change it to 2(two), the second inner layout doesn't appear in the design ?
<LinearLayout
android:id="#+id/Main"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#ffffff"
android:orientation="vertical"
android:gravity="center"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="2"
android:gravity="center"
>
<ImageView
android:id="#+id/HomePageIcon"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:adjustViewBounds="true" />
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingHorizontal="33dp"
android:paddingBottom="30dp"
>
</LinearLayout>

Use it like below height set to 0dp when orientation is vertical.
<LinearLayout
android:id="#+id/Main"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#ffffff"
android:orientation="vertical"
android:gravity="center"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#color/colorAccent"
android:layout_weight="1"
>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:background="#color/background_dark"
android:gravity="center"
>
<ImageView
android:id="#+id/HomePageIcon"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:adjustViewBounds="true" />
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#color/colorPrimaryDark"
android:orientation="vertical"
android:paddingHorizontal="33dp"
android:paddingBottom="30dp"
>
</LinearLayout>

Use the Constraint Layout and forget the Linear and Relative layout.

Pls try this,
<LinearLayout
android:id="#+id/Main"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#ffffff"
android:orientation="vertical"
android:gravity="center"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
>
<ImageView
android:id="#+id/HomePageIcon"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:adjustViewBounds="true" />
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="vertical"
android:paddingHorizontal="33dp"
android:paddingBottom="30dp"
>
</LinearLayout>

As you are using layout_weight that means your inner layouts will take the height as much as is available to it. So, in that case there is no need of using layout_height = "wrap_content" just change it to android:layout_height="0dp"
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/Main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:gravity="center"
android:orientation="vertical"
android:weightSum="4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"></LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:gravity="center">
<ImageView
android:id="#+id/HomePageIcon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:adjustViewBounds="true" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:paddingBottom="30dp"
android:paddingHorizontal="33dp"></LinearLayout>
</LinearLayout>

When you are using weight than use 0dp to android:layout_width or android:layout_height which you want for affect using weight. And its good to use android:weightSum in parent layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/Main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:gravity="center"
android:orientation="vertical"
android:weightSum="4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"></LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:gravity="center">
<ImageView
android:id="#+id/HomePageIcon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:adjustViewBounds="true" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:paddingBottom="30dp"
android:paddingHorizontal="33dp"></LinearLayout>

Put elements between layouts [ANDROID]

I am doing an user interface in Android.
My idea is divide this interface in three equals parts (this is easy, three layouts with weight), but I want to put a images in interesctions of these layouts.
For example an image that overlapes some space in layout1 and layout2, and the same in 2 and 3.
How can do this? My code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="1.0">
<LinearLayout
android:id="#+id/first"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.33">
</LinearLayout>
<LinearLayout
android:id="#+id/second"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.33"></LinearLayout>
<LinearLayout
android:id="#+id/third"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.33"></LinearLayout>
</LinearLayout>
And my idea: Android: Placing ImageView on overlap between layouts
Thanks

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="6.0" >
<LinearLayout
android:id="#+id/first"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:orientation="vertical" >
</LinearLayout>
<LinearLayout
android:id="#+id/second"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:orientation="vertical" >
</LinearLayout>
<LinearLayout
android:id="#+id/third"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="6.0" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.0"
android:orientation="vertical" >
</RelativeLayout>
<RelativeLayout
android:id="#+id/firstDividerLayout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2.0" >
<ImageView
android:id="#+id/firstDividerImageView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:src="#drawable/ic_launcher" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/secondDividerLayout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2.0" >
<ImageView
android:id="#+id/secondDividerImageView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:src="#drawable/ic_launcher" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.0" >
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
Note that I wrapped your original LinearLayout in RelativeLayout and then I added another LinearLayout with 'dividers'. Dividers size is set by weights precisely so that it overlays your sections in the center.
This is the result (if you set red background for your 'second' layout):

Three options:
Make the view in between also percent. i. e. Each of your
LinearLayouts gets a weight of 0.30 and your views in between get a
weight of 0.05
Put the view on top of your LinearLayout 2 and 3 (not exactly same
height of each of them then)
Do it programmatically, in code set the height of each of them.

Design a round button over two colored layouts

I'm trying to design something like that :
Currently i'm having issue putting the button at "the middle" of the two layouts reunion point. Is there a way i do this ?
Thanks.

Here is a way to do it
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:background="#FF0000">
<!-- TO ADD CONTENT HERE -->
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:background="#FFFF00"
android:weightSum="0.5">
<!-- TO ADD CONTENT HERE -->
</LinearLayout>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="#000000"
android:text="TEST"
android:textColor="#FFFFFF"/>
</RelativeLayout>
OUTPUT:
You can change the layout height from android:layout_weight="0.5"

you can use RelativeLayout for your parent and try adding twoLinearLayouts , one below another and set their heights, now place a Button in your RelativeLayout and set android:layout_centerInParent="true" for your Button .
and if you want to use weight for layouts, instead of adding two LinearLayout to your RelativeLayout, add one LinearLayout with weightSum=100 and then add two LinearLayouts to it with custom weights.
for your case , you have to do sth like this :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="100" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="20"
android:background="#f00" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="80"
android:background="#0f0" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="100" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="20" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="test" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>

dividing screen into 6 areas with detecting multi touches

I'm an absolute beginner with android, I found a code that detects multitouches and another code that splits the screen into 6 areas
here is the layout for each code :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<LinearLayout
android:background="#android:color/black"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
<LinearLayout
android:background="#android:color/white"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<LinearLayout
android:background="#android:color/black"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
<LinearLayout
android:background="#android:color/darker_gray"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<LinearLayout
android:background="#android:color/white"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
<LinearLayout
android:background="#android:color/black"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
layout for detecting multitouches :
<com.example.multitouch.MultitouchView
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
my question is how to combine these two layouts? and how to know each touch in which area lies ?
Thanks in advance

Make a parent of your layout - RelativeLayout and add a View with match_parent to both sides dimensions above all views what you want. Use flag View.INVISIBLE to hide this view.
And add to this this view ScaleDetector. That's all.

How to set both width and height of layouts as percentages in android?

I need to create a horizontal layout as follows :
I can set the total width of the layout of C using android:layout_width="match_parent" but I'm completely stumped at setting the rest of the layouts. Any help is highly appreciated.
The whole app is set to run on a horizontal layout only, if that helps in decide what method to set the layouts.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="100" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="90"
android:orientation="horizontal"
android:weightSum="100" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="50"
android:background="#FF0000" >
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="50"
android:background="#00FF00" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="10"
android:background="#FFFF00" >
</LinearLayout>
</LinearLayout>

The trick is to use LinearLayout's with a certain weight like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
<View
android:id="#+id/view_A"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<View
android:id="#+id/view_B"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
<View
android:id="#+id/view_C"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="9" />
</LinearLayout>