直接前往內容

最常造訪的網頁

最近瀏覽的網頁

navigation

Linear Layout

LinearLayout is a view group that aligns all children in a single direction, vertically or horizontally. You can specify the layout direction with the android:orientation attribute.

Note: For better performance and tooling support, you should instead build your layout with ConstraintLayout.

All children of a LinearLayout are stacked one after the other, so a vertical list will only have one child per row, no matter how wide they are, and a horizontal list will only be one row high (the height of the tallest child, plus padding). A LinearLayout respects margins between children and the gravity (right, center, or left alignment) of each child.

Layout Weight

LinearLayout also supports assigning a weight to individual children with the android:layout_weight attribute. This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. A larger weight value allows it to expand to fill any remaining space in the parent view. Child views can specify a weight value, and then any remaining space in the view group is assigned to children in the proportion of their declared weight. Default weight is zero.

For example, if there are three text fields and two of them declare a weight of 1, while the other is given no weight, the third text field without weight will not grow and will only occupy the area required by its content. The other two will expand equally to fill the space remaining after all three fields are measured. If the third field is then given a weight of 2 (instead of 0), then it is now declared more important than both the others, so it gets half the total remaining space, while the first two share the rest equally.

Example

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical" >
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/to" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/subject" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="top"
        android:hint="@string/message" />
    <Button
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:text="@string/send" />
</LinearLayout>

For details about the attributes available to each child view of a LinearLayout, see LinearLayout.LayoutParams.

本網站使用 Cookie 儲存你在此指定的語言和顯示選項偏好設定。

掌握有關 Android 開發人員的最新消息和實用訣竅,協助你製作最受歡迎的 Google Play 內容。

* 必填欄位

訂閱成功!

在 WeChat 上追蹤 Google Developers

你要以瀏覽這個網站嗎?

你要求以顯示這個網頁,但你為此網站指定的語言偏好設定為

是否要變更語言偏好設定並改用瀏覽網站?稍後如要變更語言偏好設定,請利用位在每個網頁最下方的語言選單來調整設定。

你的 API 層級必須達 以上才能存取這個級別

本說明文件已隱藏,因為你為該文件選取的 API 層級為 。使用左側導覽列上方的選取工具即可變更說明文件的 API 層級。

如需進一步瞭解如何為應用程式指定 API 層級的相關資訊,請參閱 Supporting Different Platform Versions (支援不同的平台版本) (英文)。

Take a short survey?
Help us improve the Android developer experience. (April 2018 — Developer Survey)