Android Studio: Content goes off screen - android-layout

Question

Part of my UI goes off-screen when installed on an actual android device. It uses the Google maps API. The "my location" button goes a little bit off screen.
Also the map doesn't cover the complete screen even though it does in the UI preview in Android Studio.
<LinearLayout xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="269dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/SearchLocationText"
android:hint="Search Location"
android:textCursorDrawable="#drawable/black_cursor"
/>
<Button
android:text="Search"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/SearchButton"
android:onClick="onSearch" />
</LinearLayout>
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
tools:context="com.anand.projectv10.MapsActivity1"
android:layout_height="519dp"
android:layout_width="382dp" />

Answer 1

You have a preview of what you are designing at android studio.So you will design something to cover that screen but note that every screen is not with the same dimensions(width/height/dpi). When you hardcore values there is a high possibility to make view positions go wrong in real scenarios.Values assigned based on ratios always stick fine.
You can use weightSum and layout_weight to achieve what you want without hard coding values
<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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="5">
<EditText
android:id="#+id/SearchLocationText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="4"
android:ems="10"
android:hint="Search Location"
android:inputType="textPersonName"
android:textCursorDrawable="#drawable/black_cursor" />
<Button
android:id="#+id/SearchButton"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="onSearch"
android:text="Search" />
</LinearLayout>
<fragment
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.anand.projectv10.MapsActivity1" />
</LinearLayout>
For further understanding Read
What is android:weightSum in android, and how does it work?
What does android:layout_weight mean?