I want put 19 button in an activity like the app phone keyboard. I'm programming a simple calculator.
The buttons seem good from android studio xml preview, but when i run my app on device buttons has different size so the effect isn't correct. How can i take the same effect o device?
This is my xml:
<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4" 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=".Calcolatrice">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".25"
android:id="@+id/virgola"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@+id/uguale"
android:layout_toStartOf="@+id/uguale"
android:layout_centerHorizontal="true"
android:text="@string/virgola"
android:onClick="virgola" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".25"
android:id="@+id/uguale"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:text="@string/uguale"
android:onClick="uguale" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="@string/zero"
android:id="@+id/zero"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/virgola"
android:layout_toStartOf="@+id/virgola"
android:onClick="zero" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/piu"
android:layout_above="@+id/uguale"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:text="@string/piu"
android:onClick="piu" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tre"
android:layout_alignBottom="@+id/piu"
android:layout_toLeftOf="@+id/piu"
android:layout_centerHorizontal="true"
android:layout_toRightOf="@+id/zero"
android:layout_toEndOf="@+id/zero"
android:text="@string/tre"
android:onClick="tre" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/uno"
android:layout_alignTop="@+id/tre"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/uno"
android:onClick="uno" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/due"
android:layout_above="@+id/virgola"
android:layout_toLeftOf="@+id/virgola"
android:layout_toStartOf="@+id/virgola"
android:text="@string/due"
android:onClick="due"
android:layout_marginLeft="0dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/quattro"
android:layout_above="@+id/uno"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/quattro"
android:onClick="quattro" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/cinque"
android:layout_centerHorizontal="true"
android:layout_alignTop="@+id/quattro"
android:layout_toRightOf="@+id/uno"
android:layout_toEndOf="@+id/uno"
android:text="@string/cinque"
android:onClick="cinque" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/sei"
android:layout_alignTop="@+id/cinque"
android:layout_toRightOf="@+id/due"
android:layout_toEndOf="@+id/due"
android:text="@string/sei"
android:onClick="sei" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/meno"
android:layout_above="@+id/piu"
android:layout_toRightOf="@+id/sei"
android:layout_toEndOf="@+id/sei"
android:text="@string/meno"
android:onClick="meno" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/sette"
android:layout_above="@+id/quattro"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/sette"
android:onClick="sette" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/otto"
android:layout_above="@+id/quattro"
android:layout_toRightOf="@+id/sette"
android:layout_toEndOf="@+id/sette"
android:text="@string/otto"
android:onClick="otto" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/nove"
android:layout_above="@+id/sei"
android:layout_toRightOf="@+id/cinque"
android:layout_toEndOf="@+id/cinque"
android:text="@string/nove"
android:onClick="nove" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/per"
android:layout_alignTop="@+id/nove"
android:layout_toRightOf="@+id/sei"
android:layout_toEndOf="@+id/sei"
android:text="@string/per"
android:onClick="moltiplica" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/cancella"
android:layout_above="@+id/sette"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/cancella"
android:onClick="cancella" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/piuomeno"
android:layout_alignTop="@+id/cancella"
android:layout_toRightOf="@+id/sette"
android:layout_toEndOf="@+id/sette"
android:text="@string/piuomeno"
android:onClick="piuomeno" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/percento"
android:layout_above="@+id/nove"
android:layout_toRightOf="@+id/otto"
android:layout_toEndOf="@+id/otto"
android:text="@string/percento"
android:onClick="percentuale" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/diviso"
android:layout_alignTop="@+id/percento"
android:layout_toRightOf="@+id/nove"
android:layout_toEndOf="@+id/nove"
android:text="@string/diviso"
android:onClick="diviso" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/textView"
android:layout_above="@+id/cancella"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignRight="@+id/diviso"
android:layout_alignEnd="@+id/diviso"
android:gravity="right"
android:textSize="50sp" />
</RelativeLayout>
Button for id zero must have the width=screen_width/2 and other must have the width=screen_width/4.
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