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center content in a simple legend layout

I build a layout that overflows the google maps and it look like that: image
so the problem that i get with the layout on the bottom is that i can't center all the conter it stays too much on the left side and i don't know really why.
I want to center the content but mantain the space with each elemnt(i consider the element the background color + the text).
How can i do it?
here is my xml(that contains the map and the layout):
<FrameLayout 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">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.afcosta.inesctec.pt.android.MapsActivity" />
<LinearLayout
android:id="#+id/newmarker"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#FFFFFFFF"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:paddingBottom="10dp"
android:layout_weight="1"
android:text="Legenda"
android:textAppearance="?android:attr/textAppearanceMedium" />
<LinearLayout
android:id="#+id/rand"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#FFFFFFFF"
android:gravity="center"
android:weightSum="3"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/myPos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:layout_weight="1"
android:background="#FFFFFFFF"
android:orientation="horizontal">
<Button
android:id="#+id/newmarker_save1"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#color/red" />
<TextView
android:id="#+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="Utilizador" />
</LinearLayout>
<LinearLayout
android:id="#+id/allFotos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginTop="10dp"
android:layout_weight="1"
android:background="#FFFFFFFF"
android:orientation="horizontal">
<Button
android:id="#+id/newmarker_save2"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#color/emerald" />
<TextView
android:id="#+id/Fotos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="Fotos" />
</LinearLayout>
<LinearLayout
android:id="#+id/Photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginTop="10dp"
android:background="#FFFFFFFF"
android:gravity="center_horizontal"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="#+id/button2"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#color/yellow" />
<TextView
android:id="#+id/textView9"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:layout_weight="1"
android:text="Planta" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</FrameLayout>
thanks!

You have to wrap_content your Button and you TextView, remove android:layout_weight="1" from the textView that lives beside your Button, then finally make sure that every single LinearLayout that wraps your Button and TextView are flagged as android:gravity="center" (this gravity is gonna be applied for its childs)
Also I strongly advise you replacing these linear layouts for Relatives to reduce your UI hierarchy
Try this.
<FrameLayout 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">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.afcosta.inesctec.pt.android.MapsActivity" />
<LinearLayout
android:id="#+id/newmarker"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#FFFFFFFF"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:paddingBottom="10dp"
android:layout_weight="1"
android:text="Legenda"
android:textAppearance="?android:attr/textAppearanceMedium" />
<LinearLayout
android:id="#+id/rand"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#FFFFFFFF"
android:gravity="center"
android:weightSum="3"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/myPos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:gravity="center_horizontal"
android:layout_weight="1"
android:background="#FFFFFFFF"
android:orientation="horizontal">
<Button
android:id="#+id/newmarker_save1"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#color/colorAccent" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="Utilizador" />
</LinearLayout>
<LinearLayout
android:id="#+id/allFotos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:gravity="center_horizontal"
android:layout_marginTop="10dp"
android:layout_weight="1"
android:background="#FFFFFFFF"
android:orientation="horizontal">
<Button
android:id="#+id/newmarker_save2"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#color/colorAccent" />
<TextView
android:id="#+id/Fotos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="Fotos" />
</LinearLayout>
<LinearLayout
android:id="#+id/Photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginTop="10dp"
android:background="#FFFFFFFF"
android:gravity="center_horizontal"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="#+id/button2"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#color/colorAccent" />
<TextView
android:id="#+id/textView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="Planta" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
I presume that's what you want, right?

Unable to set Admob Banner in Bottom

I am trying to set my admob banner on bottom of the screen but it's not showing. I have tried all possible way to set it as bottom but I am unable to set it...its going down side of expandable list view.
My XML is like below...let me know if someone can help me to sort out issue.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#e7e7e7"
android:gravity="center"
android:orientation="vertical"
android:weightSum="1">
<include
layout="#layout/top_points_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<View
android:layout_width="match_parent"
android:layout_height="#dimen/five">
</View>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical">
<ImageView
android:layout_width="#dimen/laytop_imgwidthheight"
android:layout_height="#dimen/laytop_imgwidthheight"
android:contentDescription="#string/app_name"
android:src="#drawable/app_icon"
android:visibility="gone" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:gravity="left"
android:padding="#dimen/five"
android:text="Country of Purchase"
android:textColor="#color/Gray"
android:textSize="18sp"
android:textStyle="bold" />
<RelativeLayout
android:id="#+id/layout_country_selection"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginTop="5dp"
android:background="#drawable/list_item_background"
android:orientation="horizontal"
android:padding="6dp">
<com.commonutility.RoundImageView
android:id="#+id/imageView_country_logo"
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_gravity="center_vertical"
android:layout_marginBottom="4dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="8dp"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="#drawable/country_default_logo"
android:visibility="visible" />
<TextView
android:id="#+id/textView_country_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:layout_toRightOf="#+id/imageView_country_logo"
android:padding="5dp"
android:text="Select Your Country"
android:textColor="#color/Blue"
android:textSize="19sp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:layout_marginRight="5dp"
android:padding="3dp"
android:src="#drawable/dropdown" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="gone"
android:weightSum="2">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="#dimen/five"
android:layout_weight="1"
android:gravity="right"
android:paddingBottom="#dimen/five"
android:paddingTop="#dimen/five"
android:text="Country"
android:textColor="#fe4080"
android:textSize="#dimen/rewards_countrytextsize"
android:textStyle="bold" />
<TextView
android:id="#+id/txtcountry"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="left"
android:paddingBottom="#dimen/five"
android:paddingTop="#dimen/five"
android:text="USA"
android:textColor="#color/material_color_primary_dark"
android:textSize="#dimen/rewards_countrytextsize"
android:textStyle="bold" />
</LinearLayout>
<ExpandableListView
android:id="#+id/lvExp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:background="#drawable/list_item_background"
android:cacheColorHint="#android:color/transparent"
android:divider="#color/md_white_1000"
android:dividerHeight="0dp"
android:groupIndicator="#null"
android:scrollbars="none" />
<com.google.android.gms.ads.AdView
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:clickable="false"
android:nestedScrollingEnabled="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="#string/banner_home_footer">
</com.google.android.gms.ads.AdView>
</LinearLayout>
Let me know what is wrong in this.
Thanks :)

android:layout_alignParentBottom="true"
works only in RelativeLayout, but it's inside a LinearLayout.
You could change the root layout to RelativeLayout and wrap everything but your AdView inside another LinearLayout (or better handle the behaviour of the other views as expected inside a RelativeLayout to avoid deep layouts).

How to lay horizontaly these views?

I want to implement the following layout:
I did it as follows:
<?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:layout_marginTop="10dp"
android:orientation="horizontal"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical"
android:layout_marginRight="20dp"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LABEL"
android:textSize="14sp"
android:layout_marginBottom="5dp"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:padding="10dp"
android:text="Text Box 1"
android:textSize="14sp"
/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
>
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LABEL 2"
android:layout_marginBottom="5dp"
android:textSize="14sp"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="BLA-1"
android:background="#color/white"
android:textSize="14sp"
/>
<TextView android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:gravity="center|bottom"
android:text="and"
android:textSize="14sp"
/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="BLA-2"
android:background="#color/white"
android:textSize="14sp"
/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
Basically I used LinearLayouts and gravity.
It works but it seems kind of complex and I noticed that when I increase the margins left and right of the and text the texts BLA-1 and BLA-2 get cut off.
Is there a better way for this?
I think I can not use a relative layout as I would not be able to have the views take these sizes across the screen, right?
UPDATE:
Also with my approach any kind of padding in the TextViews cuts off the text

This looks the same as on screenshot (just customize colors)
<?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"
android:padding="16dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LABEL" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#FFF"
android:hint="Text Box 1"
android:padding="4dp"
android:textColorHint="#757575" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LABEL2" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#FFF"
android:hint="BLA-1"
android:padding="4dp"
android:textColorHint="#757575" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:text="and" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#FFF"
android:hint="BLA-2"
android:padding="4dp"
android:textColorHint="#757575" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

I think LinearLayout is a good choise even though it is complex if you want to keep the weights.
You should change all your TextViews to wrap_content so they won't get cut off.
If you still want to avoid spaces you can wrap each TextView with a LinearLayout or FrameLayout like this:
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LABEL2" />
</LinearLayout>

Here you can get it using Linear Layout. Have a look at below xml layout exactly what you are looking for.
<?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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
android:orientation="horizontal"
android:weightSum="3"
tools:ignore="DisableBaselineAlignment">
<LinearLayout
android:id="#+id/llOne"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.5"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="LABEL"
android:textSize="14sp" />
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:hint="textbox1"
android:padding="10dp"
android:textSize="14sp" />
</LinearLayout>
<LinearLayout
android:id="#+id/llTwo"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.6"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="LABEL"
android:textSize="14sp" />
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:hint="BLA1"
android:padding="10dp"
android:textSize="14sp" />
</LinearLayout>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center|bottom"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_weight="0.3"
android:text="and"
android:textSize="14sp" />
<LinearLayout
android:id="#+id/llThree"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center|bottom"
android:layout_weight="0.6"
android:orientation="vertical">
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:hint="BLA2"
android:padding="10dp"
android:textSize="14sp" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>

Android studio , how to align multiple text view and edit texts in linear layout(horizontal)

I'm a beginner in android development, my project requires me to build a simple UI app using two fragments (home and field). The home will show the starup page with 5 buttons. when we click on these buttons, it will then call field fragment and show fields like:
conductivity:----,height:----
and etc to fill up, like inserting manual data.
my issue here is , the project requires me to use linearlayout in horizontal alignment for the field frag, when i do that and add edit text and text views, its lined in same line as horizontal, but what i need is it to appear one and the other below it: SOme thing like
conductivity(text view): ___________(editText)
[another line]
height(text view):________(editText)
and so on. SOrry this might be a simple issue but i have been stuck on this for 2 days now. Help me
my code for field fragment.xml is as follows:
<?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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hp1_textView"
android:id="#+id/hp1_textView"
android:textSize="32sp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/hp1_textView"
android:layout_centerHorizontal="true"
android:id="#+id/linearLayout">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/conductivity"
android:id="#+id/textView"/>
<EditText android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/editText"
android:layout_weight="1"
android:hint="#string/conductivity_field" />
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="pH:"
android:id="#+id/textView2" />
<EditText android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/editText2"
android:layout_weight="1"
android:hint="0.-14" />
</LinearLayout>
</RelativeLayout>
THis is how i want it to display

Use this xml in your code as it is
<?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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp"
android:weightSum="2">
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Conductivity (uS): "
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="745.2" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp"
android:weightSum="2">
<TextView
android:id="#+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="pH: "
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="7.1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp"
android:weightSum="2">
<TextView
android:id="#+id/textView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Moisture(%): "
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="0-100" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp"
android:weightSum="2">
<TextView
android:id="#+id/textVie4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:singleLine="true"
android:text="Dissolved oxygen(ppm): "
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="0-100" />
</LinearLayout>
<Button
android:id="#+id/btn1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:padding="5dp"
android:text="Save Log Entry" />
<Button
android:id="#+id/btn2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:padding="5dp"
android:text="Show Log Entry" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:padding="5dp"
android:weightSum="3">
<Button
android:id="#+id/btn3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_weight="1"
android:padding="5dp"
android:text="Previouse" />
<Button
android:id="#+id/btn4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_weight="1"
android:padding="5dp"
android:text="Next" />
<Button
android:id="#+id/btn5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_weight="1"
android:padding="5dp"
android:text="Home" />
</LinearLayout>
</RelativeLayout>
I hope its solve your problem.....

Try below with android:weightSum and LinearLayout with android:orientation
<?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">
<TextView
android:id="#+id/hp1_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="hp1"
android:textSize="32sp" />
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="12">
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="2"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="#+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:text="conductivity"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:hint="conductivity_field" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="2"
android:orientation="horizontal">
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:text="pH:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:hint="0.-14" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="2"
android:orientation="horizontal">
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:text="Moisture(%):"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:hint="0-100" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="2"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="#+id/textView4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:text="Disolved Oxygen(ppm)"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editText4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:hint="0-100" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout6"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="2"
android:orientation="vertical"
android:weightSum="2">
<Button
android:id="#+id/Button11"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_gravity="bottom"
android:layout_weight="1"
android:gravity="center"
android:text="Save log entry"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="#+id/Button12"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_gravity="bottom"
android:layout_weight="1"
android:gravity="center"
android:hint="Show log entries"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="2"
android:orientation="horizontal"
android:weightSum="3">
<Button
android:id="#+id/Button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="1"
android:gravity="center"
android:text="conductivity"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="#+id/Button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="1"
android:hint="conductivity_field" />
<Button
android:id="#+id/Button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="1"
android:hint="conductivity_field" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

If my understanding of your scenario is correct, to display them one below the other as in the image you have supplied, the orientation of the linearLayout must be set to vertical. If you use orientation horizontal the drawing of widgets will falls to the next line, only after it has drawn widgets completely all the way up to the width of your phone( and then it jumped to the next line) .So the LinearLayout should be changed to vertical orientation
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/hp1_textView"
android:layout_centerHorizontal="true"
android:id="#+id/linearLayout">

LinearLayout and FrameLayout for positioning buttons

I tried to figure this out on my own for hours already and just can't make it. Here it what I am trying to do: Image of desired layout
The "blue" rectangle is the area the TextSwitcher is supposed to encompass, but I can't manage to put the "Redo Set" directly above the "Previous Item" and the "Next Set" directly above the "Next Item" button. Here is my layout xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Spinner
android:id="#+id/spinner_1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Spinner
android:id="#+id/spinner_2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Spinner
android:id="#+id/spinner_3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<TextSwitcher
android:id="#+id/textSwitcherMain"
android:gravity="center"
android:layout_gravity="center"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="40sp"
android:keepScreenOn="true"
android:text="" >
</TextSwitcher>
<Button
android:id="#+id/problematicButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|top"
android:visibility="visible"
android:text="#string/problematic" />
<Button
android:id="#+id/playButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|top"
android:visibility="visible"
android:text="#string/play_1" />
<Button
android:id="#+id/nextSetButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|bottom"
android:visibility="visible"
android:text="#string/next_set" />
<Button
android:id="#+id/redoSetButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|bottom"
android:visibility="visible"
android:text="#string/redo_set" />
</FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="#+id/previousButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/previous_item_button" />
<Button
android:id="#+id/nextButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/next_item_button" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<com.google.android.gms.ads.AdView
ads:adUnitId="**************"
ads:adSize="SMART_BANNER"
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center" />
</LinearLayout>
I tried putting nextButton and previousButton in the FrameLayout, but then they overlap with redoSetButton and nextSetButton respectively. Also, nextButton and previousButton should each take up 50% of the width, so I somewhat have to put it into a LinearLayout and I tried putting various combinations inside the FrameLayout, but I can't manage to position those buttons in this way.
Furthermore, it's important that all those buttons are on top of the TextSwitcher, because it will have a background image/colouring that should be visible behind the buttons.
This is my first posting. I hope I was detailed enough. Thanks for your input in advance.

Try this way,hope this will help you to solve your problem.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Spinner
android:id="#+id/spinner_1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Spinner
android:id="#+id/spinner_2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Spinner
android:id="#+id/spinner_3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<TextSwitcher
android:id="#+id/textSwitcherMain"
android:gravity="center"
android:layout_gravity="center"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="40sp"
android:keepScreenOn="true"
android:text="" >
</TextSwitcher>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top">
<Button
android:id="#+id/problematicButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/problematic" />
<Button
android:id="#+id/playButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/play_1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom">
<Button
android:id="#+id/nextSetButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/next_set" />
<Button
android:id="#+id/redoSetButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/redo_set" />
</LinearLayout>
</FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="#+id/previousButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/previous_item_button" />
<Button
android:id="#+id/nextButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/next_item_button" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<com.google.android.gms.ads.AdView
ads:adUnitId="**************"
ads:adSize="SMART_BANNER"
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center" />
</LinearLayout>
</LinearLayout>