Brauchen Sie Hilfe beim Bearbeiten des relativen Layouts

Question

Ich bin neu in Android Studio und Bau eines kleinen Taschenrechners. Hier ist ein Screenshot:

http://i.stack.imgur.com/Q76Oo.jpg

Wie Sie sehen können, ist es ausgerichtet mit dem linken Rand, anstatt in der Mitte, die Ich mag würde. Alle Tasten basieren auf der Taste √. Ist das eine schlechte Sache? Wie stelle ich sie in den Mittelpunkt?

Dank

Bearbeiten - Hier mein content_only Code ist:

<?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: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.thegreat.douglas.calculator.OnlyActivity" 
    tools:showIn="@layout/activity_only"> 


    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/sqrt_key" 
     android:id="@+id/sqrt_key" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="178dp" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/seven_key" 
     android:id="@+id/seven_key" 
     android:layout_below="@+id/sqrt_key" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/four_key" 
     android:id="@+id/four_key" 
     android:layout_below="@+id/seven_key" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/one_key" 
     android:id="@+id/one_key" 
     android:layout_below="@+id/four_key" 
     android:layout_alignRight="@+id/four_key" 
     android:layout_alignEnd="@+id/four_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/zero_key" 
     android:id="@+id/zero_key" 
     android:layout_below="@+id/one_key" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/point_key" 
     android:id="@+id/point_key" 
     android:layout_below="@+id/one_key" 
     android:layout_toRightOf="@+id/one_key" 
     android:layout_toEndOf="@+id/one_key" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/two_key" 
     android:id="@+id/two_key" 
     android:layout_above="@+id/zero_key" 
     android:layout_toRightOf="@+id/one_key" 
     android:layout_toEndOf="@+id/one_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/five_key" 
     android:id="@+id/five_key" 
     android:layout_above="@+id/one_key" 
     android:layout_toRightOf="@+id/four_key" 
     android:layout_toEndOf="@+id/four_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/eight_key" 
     android:id="@+id/eight_key" 
     android:layout_above="@+id/four_key" 
     android:layout_toRightOf="@+id/seven_key" 
     android:layout_toEndOf="@+id/seven_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/left_parenth_key" 
     android:id="@+id/left_parenth_key" 
     android:layout_above="@+id/seven_key" 
     android:layout_toRightOf="@+id/sqrt_key" 
     android:layout_toEndOf="@+id/sqrt_key" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/right_parenth_key" 
     android:id="@+id/right_parenth_key" 
     android:layout_above="@+id/eight_key" 
     android:layout_toRightOf="@+id/eight_key" 
     android:layout_toEndOf="@+id/eight_key" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/nine_key" 
     android:id="@+id/nine_key" 
     android:layout_below="@+id/left_parenth_key" 
     android:layout_toRightOf="@+id/eight_key" 
     android:layout_toEndOf="@+id/eight_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/six_key" 
     android:id="@+id/six_key" 
     android:layout_below="@+id/eight_key" 
     android:layout_toRightOf="@+id/five_key" 
     android:layout_toEndOf="@+id/five_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/three_key" 
     android:id="@+id/three_key" 
     android:layout_above="@+id/point_key" 
     android:layout_toRightOf="@+id/point_key" 
     android:layout_toEndOf="@+id/point_key" 
     android:onClick="numbers" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/negative_key" 
     android:id="@+id/negative_key" 
     android:layout_alignBottom="@+id/point_key" 
     android:layout_toRightOf="@+id/point_key" 
     android:layout_toEndOf="@+id/point_key" 
     android:onClick="specialOperator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/multiply_key" 
     android:id="@+id/multiply_key" 
     android:layout_above="@+id/nine_key" 
     android:layout_toRightOf="@+id/right_parenth_key" 
     android:layout_toEndOf="@+id/right_parenth_key" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/subtract_key" 
     android:id="@+id/subtract_key" 
     android:layout_above="@+id/six_key" 
     android:layout_toRightOf="@+id/nine_key" 
     android:layout_toEndOf="@+id/nine_key" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/add_key" 
     android:id="@+id/add_key" 
     android:layout_above="@+id/three_key" 
     android:layout_toRightOf="@+id/six_key" 
     android:layout_toEndOf="@+id/six_key" 
     android:onClick="operator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/enter_key" 
     android:id="@+id/enter_key" 
     android:layout_toRightOf="@+id/three_key" 
     android:layout_toEndOf="@+id/three_key" 
     android:layout_alignBottom="@+id/negative_key" 
     android:layout_alignTop="@+id/three_key" 
     android:onClick="enterKey" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/clear_key" 
     android:id="@+id/clear_key" 
     android:onClick="clearEquation" 
     android:layout_above="@+id/left_parenth_key" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="" 
     android:id="@+id/equation" 
     android:layout_above="@+id/clear_key" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_alignRight="@+id/multiply_key" 
     android:layout_alignEnd="@+id/multiply_key" 
     android:clickable="false" 
     android:textAlignment="textEnd" 
     android:height="@dimen/abc_action_bar_stacked_max_height" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/square_key" 
     android:id="@+id/square_key" 
     android:layout_below="@+id/equation" 
     android:layout_toRightOf="@+id/sqrt_key" 
     android:layout_toEndOf="@+id/sqrt_key" 
     android:onClick="specialOperator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/negative_exp_key" 
     android:id="@+id/neg_exp_key" 
     android:layout_below="@+id/equation" 
     android:layout_toRightOf="@+id/left_parenth_key" 
     android:layout_toEndOf="@+id/left_parenth_key" 
     android:onClick="specialOperator" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/divide_key" 
     android:id="@+id/divide_key" 
     android:layout_below="@+id/equation" 
     android:layout_toRightOf="@+id/right_parenth_key" 
     android:layout_toEndOf="@+id/right_parenth_key" 
     android:onClick="operator" /> 


</RelativeLayout> 

Answer 1

Can you Share the xml-layout design code than we can help you: 

**Edited:** 
Use `android:gravity="center"` code in Root node of the xml file. 

**In your case:** 

<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:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:gravity="center" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="com.thegreat.douglas.calculator.OnlyActivity" 
    tools:showIn="@layout/activity_only"> 
<Button ... 
// Add all button design code here 

</RelativeLayout> 

Answer 2

Verwenden android: layout_gravity = "center". und verwalten Sie Räume von Auffüllen in Dimen Ordner für Ihr Eltern-Layout. Ihre Anforderung sollte erledigt werden.