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Need help on EditText center in linear layout

I am trying to center edittext vertically and horizontally in a linear layout, but it does not work. A very simple problem.

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" 
 android:background="@drawable/login">



<EditText
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:background="@drawable/loginbutton"
    android:text="Username"
    android:layout_gravity="center"
    android:textSize="25dp"
    android:gravity="center_horizontal|center_vertical"
    android:textColor="#000000"
    android:layout_margin="10dp"
    android:id="@+id/username">
  </EditText>

I will try to switch to relativelayout on average.

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5 answers

LinearLayoutdo not support centering in the direction in which it stores elements, as far as I know. If the value is LinearLayoutnot critical (which in your case should not be the way you also need centering), I would recommend that you switch to RelativeLayout.
With, RelativeLayoutyou can set the attribute android:layout_centerInParent="true"to EditTextso that it is centered.

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, ( ), EditText . , layout_gravity, , UI . , OP, , .

RelativeLayout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/login"
android:orientation="vertical" >

<EditText
    android:id="@+id/username"
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:background="@drawable/loginbutton"
    android:layout_centerInParent="true"
    android:text="Username"
    android:textColor="#000000"
    android:textSize="25dp" >
</EditText>

</RelativeLayout>
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It is very simple. Add android: gravity = "center" with a linear layout.

<LinearLayout 
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:orientation="vertical"
android:gravity="center"
>
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LinearLayout 
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:orientation="vertical"
android:background="@drawable/login"
android:gravity="center"
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Try the following:

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" 
 android:background="@drawable/login"
 android:layout_centerVertical="true"
 android:layout_centerInParent="true">
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