java android overlay

Hello, please tell me how to remove the imposition of objects? There is an application with the following activation structure - , the problem is that on small screens, the buttons that are at the bottom overlap the list and they can not be pressed, tell me how to make them up? or how to remove this overlay. These buttons are in another file -

Content_main code:

<?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" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/content_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context="com.example.andrei.test.MainActivity" tools:showIn="@layout/activity_main"> <LinearLayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:weightSum="1"> <AutoCompleteTextView android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:id="@+id/location" android:hint="Введите расположение оборудования" android:inputType="text" android:layout_marginTop="16dp" android:layout_below="@+id/spinner" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:imeOptions="actionDone" /> <CheckBox android:text="Ввести инвентарный номер" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/checbox_inventory" /> <TextView android:text="@string/list_scaning" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <ListView android:layout_width="match_parent" android:layout_weight="0.20" android:id="@+id/list" android:layout_height="286dp" /> <!--<Button android:text="@string/clear_list_scaning" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/clear_list_scaning" /> --> </LinearLayout> </RelativeLayout> 

Activity_main code:

 <?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:context="com.example.andrei.test.MainActivity"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> </android.support.design.widget.AppBarLayout> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" app:srcCompat="@android:drawable/presence_video_busy" /> <Button android:text="@string/clear_list_scaning" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/clear_list_scaning" app:layout_anchorGravity="center_vertical|center_horizontal" android:layout_gravity="bottom|left" android:layout_marginLeft="10dp" android:layout_marginBottom="15dp"/> <include layout="@layout/content_main" /> </android.support.design.widget.CoordinatorLayout> 

Androidmanifest:

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.andrei.test"> <!-- To auto-complete the email text field in the login form with the user's emails --> <uses-permission android:name="android.permission.GET_ACCOUNTS" /> <uses-permission android:name="android.permission.READ_PROFILE" /> <uses-permission android:name="android.permission.READ_CONTACTS" /> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme" android:name="com.orm.SugarApp"> <meta-data android:name="DATABASE" android:value="sugar_example.db" /> <meta-data android:name="VERSION" android:value="45" /> <meta-data android:name="QUERY_LOG" android:value="true" /> <meta-data android:name="DOMAIN_PACKAGE_NAME" android:value="com.example" /> <activity android:name=".MainActivity" android:label="@string/app_name" android:theme="@style/AppTheme.NoActionBar" android:windowSoftInputMode="stateHidden"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- ATTENTION: This was auto-generated to add Google Play services to your project for App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. --> <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" /> <activity android:name=".SettingsActivity" android:label="@string/title_activity_settings" android:windowSoftInputMode="stateHidden" android:parentActivityName=".MainActivity"> <meta-data android:name="android.support.PARENT_ACTIVITY" android:value="com.example.andrei.test.MainActivity" /> </activity> </application> </manifest>