Develop Reference

Grid Not Taking Full Width

I recently got a new computer and installed android studio on it. Now my grid is not taking the full width of the screen. I am almost certain it was taking the full width on my other install of android studio. I do not have a device to test on but on the emulators it is not working.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
tools:context="io.musicschool.app.NoteTrainerActivity">
<ImageView
android:id="#+id/intervalNoteImage"
android:layout_width="0dp"
android:layout_height="200dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:scaleType="fitXY"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/c4" />
<ScrollView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="30dp"
android:clipToPadding="false"
android:fillViewport="false"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/intervalNoteImage"
app:layout_constraintVertical_bias="0.0">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<GridLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:columnCount="3"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/noteImage"
>
<Button
android:id="#+id/unison_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:text="Unison"
android:textAllCaps="false"
/>
<Button
android:id="#+id/min2nd_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_row="0"
android:text="Min 2nd"
android:textAllCaps="false"/>
<Button
android:id="#+id/maj2nd_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_row="0"
android:text="Maj 2nd"
android:textAllCaps="false" />
<Button
android:id="#+id/min3rd_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_row="1"
android:text="Min 3rd"
android:textAllCaps="false"
/>
<Button
android:id="#+id/maj3rd_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_row="1"
android:text="Maj 3rd"
android:textAllCaps="false" />
<Button
android:id="#+id/per4th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_row="1"
android:text="Per 4th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/aug4th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_row="2"
android:text="Aug 4th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/dim5th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_row="2"
android:text="Dim 5th"
android:textAllCaps="false" />
<Button
android:id="#+id/per5th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_row="2"
android:text="Per 5th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/min6th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_row="3"
android:text="Min 6th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/maj6th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_row="3"
android:text="Maj 6th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/min7th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_row="3"
android:text="Min 7th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/maj7th_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_row="4"
android:text="Maj 7th"
android:textAllCaps="false"
/>
<Button
android:id="#+id/oct_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_row="4"
android:text="Octave"
android:textAllCaps="false"
/>
</GridLayout>
</LinearLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>

Android On Screen Buttons overlap with Tabs Application

I am building the layout of my App. It uses the default Tabs layout and the fragment is a Relative Layout with a GridLayout and a TableLayout in it.
At the bottom of the Screen I have a View, which should be fixed to the bottom of the screen with android:layout_alignParentBottom="true" and the Preview shows the layout I intend.
When I run the App in the Simulator the Android On Screen Buttons overlap and cover the lower Part of my App.
Preview:
Simulator:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="0dp"
android:paddingRight="0dp" >
<View
android:layout_width="fill_parent"
android:layout_height="4dp"
android:background="#android:color/white"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_above="#+id/bottomView"
android:id="#+id/spacer"/>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="65dp"
android:columnCount="3"
android:rowCount="2"
android:orientation="vertical"
android:layout_alignParentLeft="true"
android:layout_alignParentBottom="true"
android:fitsSystemWindows="true"
android:background="#android:color/white"
android:verticalSpacing="0dp"
android:horizontalSpacing="0dp"
android:id="#+id/bottomView"
>
<TextView
android:text="Punkte ø"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:textSize="18sp" />
<TextView
android:text="15.0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:textSize="24sp" />
N<TextView
android:text="Noten ø"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:textSize="18sp" />
<TextView
android:text="1.0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:textSize="24sp" />
<TextView
android:text="Anzahl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:textSize="18sp" />
<TextView
android:text="5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:textSize="24sp" />
</GridLayout>
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/holo_red_dark"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/textView"
android:layout_above="#id/spacer"
android:id="#+id/red"
>
<GridLayout
android:id="#+id/grid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnCount="3"
android:layout_below="#+id/textView"
android:layout_above="#id/spacer"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="13"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="14"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="15"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="10"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="11"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="12"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="7"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="8"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="9"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="5"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="6"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="AC"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DEL"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:textColor="#android:color/white"
/>
</GridLayout>
</TableLayout>
<TextView
android:text="15 15 15 15 15"
android:layout_width="wrap_content"
android:layout_height="65dp"
android:id="#+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:textAppearance="#style/TextAppearance.AppCompat.Display1"
android:textAlignment="center"
android:gravity="center"
android:background="#android:color/darker_gray" />
How can I make the white bottom view stick to the botttom without being overlaped by the naviugation buttons?

Please replace with this code you can see perfect layout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="0dp"
android:paddingRight="0dp">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="65dp"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#android:color/darker_gray"
android:gravity="center"
android:text="15 15 15 15 15"
android:textAlignment="center"
android:textAppearance="#style/TextAppearance.AppCompat.Display1" />
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/bottomView"
android:layout_width="fill_parent"
android:layout_height="65dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#android:color/white"
android:columnCount="3"
android:fitsSystemWindows="true"
android:horizontalSpacing="0dp"
android:orientation="vertical"
android:rowCount="2"
android:verticalSpacing="0dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:text="Punkte ø"
android:textSize="18sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:text="15.0"
android:textSize="24sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:text="Noten ø"
android:textSize="18sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:text="1.0"
android:textSize="24sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:text="Anzahl"
android:textSize="18sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:text="5"
android:textSize="24sp" />
</GridLayout>
<View
android:id="#+id/spacer"
android:layout_width="fill_parent"
android:layout_height="4dp"
android:layout_above="#id/bottomView"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:background="#android:color/white" />
<TableLayout
android:id="#+id/red"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#id/textView"
android:layout_above="#id/spacer"
android:background="#android:color/holo_red_dark">
<GridLayout
android:id="#+id/grid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#id/spacer"
android:layout_below="#id/textView"
android:columnCount="3">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="13"
android:textColor="#android:color/white" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="14"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="15"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="10"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="11"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="12"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="7"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="8"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="9"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="4"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="5"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="6"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="1"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="2"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="3"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="AC"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="0"
android:textColor="#android:color/white"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_gravity="fill"
android:layout_rowWeight="1"
android:background="#color/colorAccent"
android:text="DEL"
android:textColor="#android:color/white"
/>
</GridLayout>
</TableLayout>

GridLayout looks diffrent in Android Studio vs device

I'm new to Android development. Could somebody tell me, why Android Studio (screenshot) is showing different from my phone (screenshot)? What is wrong with the code? Is there any solution to the problem?
<?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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.dell.braintrainer.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GO"
android:id="#+id/btnGO"
android:textSize="80dp"
android:padding="30dp"
android:onClick="start"
android:nestedScrollingEnabled="true"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:visibility="invisible" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="20s"
android:id="#+id/timerTextview"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="30sp"
android:padding="10sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0/0"
android:id="#+id/scoreTextview"
android:textSize="30sp"
android:layout_alignBottom="#+id/timerTextview"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:padding="10sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="31 + 12"
android:id="#+id/textView"
android:textSize="30sp"
android:padding="20dp"
android:layout_alignTop="#+id/scoreTextview"
android:layout_centerHorizontal="true"
android:textColor="#050505" />
<GridLayout
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_below="#+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_column="0"
android:layout_row="0"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_gravity="fill"
android:tag="0"
android:text="31"
android:textSize="40sp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button1"
android:layout_column="1"
android:layout_row="0"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_gravity="fill"
android:tag="1"
android:text="31"
android:textSize="40sp"
/>
<Button
android:layout_width="wrap_content"
android:id="#+id/button2"
android:layout_column="0"
android:layout_row="1"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_gravity="fill"
android:tag="2"
android:text="31"
android:textSize="40sp"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button3"
android:layout_column="1"
android:layout_row="1"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_gravity="fill"
android:tag="3"
android:text="31"
android:textSize="40sp"
/>
</GridLayout>
</RelativeLayout>

It has to do with the values for size you are using.
The screen size of your phone and the android studio preview phone are not the same. At least that is what usually happens :P I hope this helps!

button size are different in emulator from real device

I am a beginner and I created 8 buttons on gridLayout.The size of buttons are different here is a xml code:
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="0"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="Hello"
android:id="#+id/hello"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="0"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="How are you"
android:id="#+id/howareyou"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="1"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="good evening"
android:id="#+id/goodevening"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="1"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="please"
android:id="#+id/please"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="2"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="my name is"
android:id="#+id/mynameis"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="2"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="do you
speak english"
android:id="#+id/doyouspeakenglish"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="3"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="welcome"
android:id="#+id/welcome"
android:onClick="buttonTapped"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="3"
android:layout_gravity="fill"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:text="i live in"
android:id="#+id/ilivein"
android:onClick="buttonTapped"/>
</GridLayout>
and here is the screenShot on Lg g3
real device Lg g3
and here is the screenShot on emulator emulator
what is the problem?

try LinearLayout with weightsum
<?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"
android:weightSum="4"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:weightSum="2"
android:padding="5dp"
>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="Hello"
android:id="#+id/hello"
android:layout_marginRight="5dp"
android:layout_marginTop="6dp"
android:layout_marginBottom="3dp"
android:onClick="buttonTapped"
/>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="How are you"
android:id="#+id/howareyou"
android:layout_marginLeft="5dp"
android:layout_marginTop="6dp"
android:layout_marginBottom="3dp"
android:onClick="buttonTapped"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:weightSum="2"
android:padding="5dp"
>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="good evening"
android:id="#+id/goodevening"
android:layout_marginRight="5dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:onClick="buttonTapped"
/>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="please"
android:id="#+id/please"
android:layout_marginLeft="5dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:onClick="buttonTapped"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:weightSum="2"
android:padding="5dp"
>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="my name is"
android:id="#+id/mynameis"
android:layout_marginRight="5dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:onClick="buttonTapped"
/>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="do you
speak english"
android:id="#+id/doyouspeakenglish"
android:layout_marginLeft="5dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:onClick="buttonTapped"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:weightSum="2"
android:padding="5dp"
>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="welcome"
android:id="#+id/welcome"
android:layout_marginRight="5dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="6dp"
android:onClick="buttonTapped"
/>
<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="Hello"
android:layout_marginLeft="5dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="6dp"
android:onClick="buttonTapped"
/>
</LinearLayout>
</LinearLayout>

you should fix your height and width of the button in dimension file for various resolution example:
values folder:
<dimen name="width">90dp</dimen>
<dimen name="height">75dp</dimen>
values-hdpi folder:
<dimen name="width">100dp</dimen>
<dimen name="height">85dp</dimen>
like this do for mdpi,,xhdpi,xxhdpi and put this in your button.
android:layout_width="#dimen/width"
android:layout_height="#dimen/height"

Android: GridLayout rows are all bunched together

Im making using a Grid Layout on an app. The Columns work fine but the rows are giving me a problem.
I want 4 rows spread evenly on the image I am using. But for some reason the rows are all bunched up with only the last row ahead of the others. Its my first time using a GridLayout and i cant see what im doing wrong.
<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" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/imageView"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:src="#drawable/pitch"/>
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:rowCount="4"
android:numColumns="5"
android:id="#+id/formation"
android:layout_alignBottom="#+id/imageView">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Gk"
android:layout_row="0"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/gk"
android:layout_columnSpan="3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DL"
android:layout_row="1"
android:layout_column="0"
android:layout_gravity="center"
android:id="#+id/dl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DC"
android:layout_row="1"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/dcl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DC"
android:layout_row="1"
android:layout_column="3"
android:layout_gravity="center"
android:id="#+id/dcr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DR"
android:layout_row="1"
android:layout_column="4"
android:layout_gravity="center"
android:id="#+id/dr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ML"
android:layout_row="2"
android:layout_column="0"
android:layout_gravity="center"
android:id="#+id/ml" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MC"
android:layout_row="2"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/mcl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MC"
android:layout_row="2"
android:layout_column="3"
android:layout_gravity="center"
android:id="#+id/mcr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MR"
android:layout_row="2"
android:layout_column="4"
android:layout_gravity="center"
android:id="#+id/mr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="FC"
android:layout_row="3"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/fcl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="FC"
android:layout_row="3"
android:layout_column="3"
android:layout_gravity="center"
android:id="#+id/fcr" />
</GridLayout>

Suggest you to use linearlayout instead of gridlayout, to set image in background you need to use FrameLayout as in below code,
<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=".MainActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/next"
android:scaleType="centerCrop" />
</FrameLayout>
<LinearLayout
android:id="#+id/formation"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="4">
<LinearLayout
android:id="#+id/formation1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center">
<Button
android:id="#+id/gk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="Gk" />
</LinearLayout>
<LinearLayout
android:id="#+id/formation2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center">
<Button
android:id="#+id/dl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="DL" />
<Button
android:id="#+id/dcl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="DC" />
<Button
android:id="#+id/dcr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="DC" />
<Button
android:id="#+id/dr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="DR" />
</LinearLayout>
<LinearLayout
android:id="#+id/formation3"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center">
<Button
android:id="#+id/ml"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="ML" />
<Button
android:id="#+id/mcl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="MC" />
<Button
android:id="#+id/mcr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="MC" />
<Button
android:id="#+id/mr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="MR" />
</LinearLayout>
<LinearLayout
android:id="#+id/formation4"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center">
<Button
android:id="#+id/fcl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="FC" />
<Button
android:id="#+id/fcr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="FC" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
hope this is usefull.

Consider instead using a vertical LinearLayout containing horizontal LinearLayouts (or more GridLayouts) for each row. Then each row view can have a layout_weight set to the same value so they are all allocated the same amount of space. In that case also set their layout_height to 0.

You can add:
android:layout_columnWeight="1"
android:layout_rowWeight="1"
in each Button. Like this:
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:rowCount="4"
android:numColumns="5"
android:id="#+id/formation"
android:layout_alignBottom="#+id/imageView">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Gk"
android:layout_row="0"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/gk"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_columnSpan="3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DL"
android:layout_row="1"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_gravity="center"
android:id="#+id/dl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DC"
android:layout_row="1"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_gravity="center"
android:id="#+id/dcl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DC"
android:layout_row="1"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="3"
android:layout_gravity="centerl"
android:id="#+id/dcr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DR"
android:layout_row="1"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="4"
android:layout_gravity="center"
android:id="#+id/dr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ML"
android:layout_row="2"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="0"
android:layout_gravity="center"
android:id="#+id/ml" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MC"
android:layout_row="2"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/mcl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MC"
android:layout_row="2"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="3"
android:layout_gravity="center"
android:id="#+id/mcr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MR"
android:layout_row="2"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="4"
android:layout_gravity="center"
android:id="#+id/mr" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="FC"
android:layout_row="3"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="1"
android:layout_gravity="center"
android:id="#+id/fcl" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="FC"
android:layout_row="3"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
android:layout_column="3"
android:layout_gravity="center"
android:id="#+id/fcr" />
</GridLayout>