Develop Reference

How to put buttons below scrollview and always show button without being overlapped by scrollview in Android?

My layout is like this
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/searchKey"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="xx" />
<ScrollView
android:layout_weight="1"
android:fillViewport="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/search_results"
android:textSize="#dimen/text_font_size"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</ScrollView>
<LinearLayout
android:orientation="horizontal"
android:layout_gravity="center|bottom"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/lastCharacterButton"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/lastChar_btn" />
<Button
android:id="#+id/nextCharacterButton"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/nextChar_btn" />
</LinearLayout>
</LinearLayout>
However, when there are little or no text, the buttons are pulled up, when there are too many text in search_results TextView, the buttons won't show up because scrollview takes the space all the way to the bottom. Any suggestion to always keep the buttons at the bottom and always visible?

First of all you have to set the ScrollView's height to 0dp.
<ScrollView
android:layout_weight="1"
android:fillViewport="true"
android:layout_width="match_parent"
android:layout_height="0dp">
<TextView
android:id="#+id/search_results"
android:textSize="#dimen/text_font_size"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</ScrollView>
You have to do this because the weight param is going to control the size of the view depending on how much space is available. If you set it to wrap content, it will take how much space it needs to wrap everything within.
Then you need to remove your LinearLayout's weight param:
<LinearLayout
android:orientation="horizontal"
android:layout_gravity="center|bottom"
android:id="#+id/LL1"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/lastCharacterButton"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Last_Char" />
<Button
android:id="#+id/nextCharacterButton"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="next_char" />
</LinearLayout>
And the reason for doing that is just the opposite of the previous explanation: in this case the wrap content is going to take the space necessary to always display the buttons within.

Here is some sample code I put together for you. You basically need to take out the linear layout you have wrapping you xml layout and use a relative layout instead. Once you do that you can add ids to the linear layout with the buttons and then have the edit text align to the parent top. Then you can put the scrollview below the edittext and then put the scrollview above to the linear layout containing the buttons. This should work!
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context="com.example.thegamefan93.loginregister.LoginActivity">
<EditText
android:id="#+id/searchKey"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_alignParentTop="true"
android:layout_height="wrap_content"
android:hint="xx" />
<ScrollView
android:layout_weight="1"
android:fillViewport="true"
android:layout_below="#id/searchKey"
android:layout_width="match_parent"
android:layout_above="#+id/LL1"
android:layout_height="wrap_content">
<TextView
android:id="#+id/search_results"
android:textSize="20sp"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</ScrollView>
<LinearLayout
android:orientation="horizontal"
android:layout_gravity="center|bottom"
android:layout_weight="1"
android:id="#+id/LL1"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/lastCharacterButton"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Last_Char" />
<Button
android:id="#+id/nextCharacterButton"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="next_char" />
</LinearLayout>
</RelativeLayout>

Try this,
<?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:orientation="vertical">
<EditText
android:id="#+id/searchKey"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:hint="xx" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/linear"
android:layout_below="#+id/searchKey"
android:layout_weight="1"
android:fillViewport="true">
<TextView
android:id="#+id/search_results"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:textSize="#dimen/text_font_size" />
</ScrollView>
<LinearLayout
android:id="#+id/linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<Button
android:id="#+id/lastCharacterButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/lastChar_btn" />
<Button
android:id="#+id/nextCharacterButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/nextChar_btn" />
</LinearLayout>
</RelativeLayout>

Alignment of elements using relative layout

My problem is I want to keep 3 elements like Buttons for example I have used a RelativeLayout as parent and LinearLayout as it's child and given android:weightSum="3" and added 3 buttons as it's children. I have achieved the UI I want.
But here Comes the original problem When One of the Button Visibility state is gone. Elements not coming properly.
How Can I achieve even though when I hide one button other two need to adjust.
Please Provide the solution if you have.
Respective Code
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:weightSum="3.0">
<Button
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_weight="1.0"
android:textColor="#ffffff"
android:text="TAB1" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:text="TAB 2"
android:visibility="gone" />
<Button
android:id="#+id/btn3"
android:layout_width="wrap_content"
android:layout_alignParentLeft="true"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:text="TAB 3" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>

You have to use relative layout instead of linear layout
<?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="wrap_content"
android:orientation="horizontal"
android:weightSum="3">
<Button
android:id="#+id/btnOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_weight="1"
android:text="1"/>
<Button
android:id="#+id/btnTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_weight="1"
android:text="2"/>
<Button
android:id="#+id/btnThree"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:text="3"/>
if you set visibility gone for second button then you can achive this

or you can programetically remove the text of second button and set transperent background for this , like below code
<?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="wrap_content"
android:orientation="horizontal"
android:weightSum="3">
<Button
android:id="#+id/btnOne"
android:layout_width="0dp"
android:text="1"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<Button
android:id="#+id/btnTwo"
android:background="#android:color/transparent"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<Button
android:text="3"
android:id="#+id/btnThree"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>

You don't have to set the android:weightSum attribute, just assign android:layout_weight=1 to every child.
https://developer.android.com/guide/topics/ui/layout/linear.html
To create a linear layout in which each child uses the same amount of space on the screen, set the android:layout_height of each view to "0dp" (for a vertical layout) or the android:layout_width of each view to "0dp" (for a horizontal layout). Then set the android:layout_weight of each view to "1" .
Use android:weightSum if you want to define the maximum weight sum. If unspecified, the sum is computed by adding the layout_weight of all of the children.
Code example:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</LinearLayout>

android:visibility="invisible" Set this attribute for middle view.
And make sure that your child view (i.e Button) width is set to 0dp. Because you are using weight for width.
Try this-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_splash"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
tools:context="com.augmented.wiki.SplashActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="3">
<Button
android:id="#+id/activity_splash_btnImage"
android:layout_width="0dp"
android:text="Button 1"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Button
android:id="#+id/activity_splash_btnImage1"
android:layout_width="0dp"
android:text="Button 2"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="invisible" />
<Button
android:id="#+id/activity_splash_btnImage2"
android:layout_width="0dp"
android:text="Button 3"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</LinearLayout>
</RelativeLayout>

layout_weight working in simulator, not on device

I have a linear layout with two listviews, a text view, and another linear layout to hold some buttons. I want the second listview to be twice the height of the first. I have set the height of both list views to 0dp and gave the first a layout_weight of 1 and the second a weight of 2, and then set the weightSum of the containing view to 3. Here is the actual layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:weightSum="3"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/categoryList" />
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:id="#+id/itemList" />
<TextView
android:id="#+id/walletStr"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/cancelBtn"
android:text="cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/buyBtn"
android:text="buy"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
On the simulator, this produces the desired effect, but on the actual device almost all of the space goes to the top listview.
Any ideas? Thanks in advance.

linear layout not have only 2 list, also have more component and you have to consider.
The weightSum should be divided all component of this linear layout.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:weightSum="7"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:id="#+id/categoryList" />
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4"
android:id="#+id/itemList" />
<TextView
android:id="#+id/walletStr"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5">
<Button
android:id="#+id/cancelBtn"
android:text="cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/buyBtn"
android:text="buy"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>

Linear Layout is not properly showing the component when using android studio

This is code
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Email:"
android:textSize="30dp"
android:paddingLeft="0dp"
android:paddingTop="10dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:singleLine="true" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Login"
android:paddingTop="10dp"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="200dp"
android:layout_height="100dp"
android:text="Home" />
<TextView
android:layout_width="200dp"
android:layout_height="200dp"
android:text="About" />
</LinearLayout>
</LinearLayout>
I want to practice a layout in android studio and I'm getting an error while implementing the code.
This is the text which goes outside the mobile screen:
Why does the blue box go outside the mobile screen?

You're not properly setting the layout. The childViews of your parentView(LinearLayout) was aligned horizontally without setting the layout weight. You should read the documentation on LinearLayout. However, to fix your layout, you can add another container to hold the first row of your layout to make the second row visible on the screen. Your current code contains all the childViews in a single row which makes the other views not visible. Try the code below:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Email:"
android:textSize="30dp"
android:paddingLeft="0dp"
android:paddingTop="10dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:singleLine="true" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Login"
android:paddingTop="10dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="200dp"
android:layout_height="100dp"
android:text="Home" />
<TextView
android:layout_width="200dp"
android:layout_height="200dp"
android:text="About" />
</LinearLayout>
</LinearLayout>

You are setting the layout_width of each view yourself. You should know that there is a maximum width of screen that is available. Moreover, you are setting the width of button as match_parent that is not proper way when the neighbouring views have some fixed width. If your are using LinearLayout try layout_weight attribute. Play around and try to experiment.
For example:
<?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="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:paddingLeft="0dp"
android:paddingTop="10dp"
android:text="Email:"
android:textSize="30dp" />
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:layout_weight="2"
android:singleLine="true" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:paddingTop="10dp"
android:text="Login" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="100dp"
android:text="Home" />
<TextView
android:layout_width="wrap_content"
android:layout_height="200dp"
android:text="About" />
</LinearLayout>
</LinearLayout>

Why only one attribute in layout_gravity in my xml working

I want my reset button to be at bottom and horizontally centered, but layout_gravity is not working, only one of them is working.
I know it can be done by choosing RelativeLayout as my parent layout but I want to do it with LinearLayout as my parent layout.
I just want reset button as bottom and horizontally centered rest everything is fine.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context="com.example.android.courtcounter.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="4dp"
android:text="TEAM A" />
<TextView
android:id="#+id/team_a_score"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="4dp"
android:text="0" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:onClick="button3"
android:text="+3" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:onClick="button2"
android:text="+2" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:onClick="button1"
android:text="Free Throw" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="4dp"
android:text="TEAM B" />
<TextView
android:id="#+id/team_b_score"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="4dp"
android:text="0" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:onClick="button3_b"
android:text="+3" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:onClick="button2_b"
android:text="+2" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:onClick="button1_b"
android:text="Free Throw" />
</LinearLayout>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:onClick="resetButton"
android:padding="8dp"
android:text="RESET" />
</LinearLayout>

Use this instead if you don't want to go completely relative (inside the parent Linear Layout):
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|bottom"
android:onClick="resetButton"
android:padding="8dp"
android:text="RESET"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
or if you don't want to keep the reset button inside a relative layout, there doesn't seem to be a solution.
You can check this out as well: How to align views at the bottom of the screen?

Since the rest of your ViewGroups in that layout fill the parent's width, you could simply set the parent LinearLayout's gravity to center_horizontal and it should line up properly, without affecting the other children:
<LinearLayout
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:orientation="vertical"
android:gravity="center_horizontal"
tools:context="com.example.android.courtcounter.MainActivity">
Edit: I didn't notice you also wanted it at the bottom... This can be achieved with an invisible weighted View between your content and the bottom:
...
<View
android:layout_width="1dip"
android:layout_height="fill_parent"
android:layout_weight="1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="resetButton"
android:padding="8dp"
android:text="RESET" />
</LinearLayout>
Edit 2: Removed layout_gravity on your button since it no longer applies.