Question

i am new to android development. I want to know how to use the attribute android:layout_gravity and can i use this option to position a view at center of the screen width.??

I tried the following but it’s aligning at top

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Table Layout" />

    <TableRow>

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.2"
            android:text="Username"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <EditText
            android:id="@+id/editText1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.8"
            android:hint="username" />
    </TableRow>

    <TableRow>

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.2"
            android:text="Password"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.8"
            android:hint="password"
            android:inputType="textPassword" />
    </TableRow>

    <TableRow>

        <Button
            android:id="@+id/button1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="SAVE" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="CANCLE" />
    </TableRow>

</TableLayout>

and my output is :

Answer 1

In Android there is

android:gravity and android:layout_gravity

android:gravity – Is used to move the content of the View or Layout to which this property is set.
android:layout_gravity – Is used to move the View or Layout itself to any position.

Here is a nice demo and explanation of how it works.

gravity and layout_gravity