[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["缺少我需要的資訊","missingTheInformationINeed","thumb-down"],["過於複雜/步驟過多","tooComplicatedTooManySteps","thumb-down"],["過時","outOfDate","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["示例/程式碼問題","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-07-27 (世界標準時間)。"],[],[],null,["# Create a linear layout\n\nTry the Compose way \nJetpack Compose is the recommended UI toolkit for Android. Learn how to work with layouts in Compose. \n[Column or Row →](/jetpack/compose/layouts/basics) \n\n[LinearLayout](/reference/android/widget/LinearLayout)\nis a view group that aligns all children in a single direction, vertically or\nhorizontally. You can specify the layout direction with the\n[`android:orientation`](/reference/android/widget/LinearLayout#attr_android:orientation)\nattribute.\n| **Note:** For better performance and tooling support, [build your layout with\n| ConstraintLayout](/training/constraint-layout). Learn more about advantages of using `ConstraintLayout` by reading [Understanding\n| the performance benefits of ConstraintLayout](https://android-developers.googleblog.com/2017/08/understanding-performance-benefits-of.html).\n**Figure 1.** A `LinearLayout` with three horizontally oriented children.\n\nAll children of a `LinearLayout` are stacked one after the other,\nso a vertical list only has one child per row, no matter how wide they are. A\nhorizontal list is only one row high, and it's the height of the tallest child,\nplus padding. A `LinearLayout` respects *margins* between\nchildren, and the *gravity*---right, center, or left\nalignment---of each child.\n\nLayout weight\n-------------\n\n`LinearLayout` also supports assigning a *weight* to\nindividual children with the\n[`android:layout_weight`](/reference/android/widget/LinearLayout.LayoutParams#attr_android:layout_weight)\nattribute. This attribute assigns an \"importance\" value to a view in terms of\nhow much space it occupies on the screen. A larger weight value lets it expand\nto fill the remaining space in the parent view. Child views can specify a weight\nvalue, and any remaining space in the view group is assigned to children\nproportionately, based on their declared weight. The default weight is zero.\n\n### Equal distribution\n\nTo create a linear layout in which each child uses the same amount of space\non the screen, set the\n[`android:layout_height`](/reference/android/view/ViewGroup.LayoutParams#attr_android:layout_height)\nof each view to `\"0dp\"` for a vertical layout, or the\n[`android:layout_width`](/reference/android/view/ViewGroup.LayoutParams#attr_android:layout_width)\nof each view to `\"0dp\"` for a horizontal layout. Then set the\n`android:layout_weight` of each view to `\"1\"`.\n\n### Unequal distribution\n\nYou can also create linear layouts where the child elements use different\namounts of space on the screen. Consider the following examples:\n\n- Suppose you have three text fields: two with a weight value of 1, and a third with the default weight value of 0. The third text field, with the weight value of 0, occupies only the area required by its content. The other two text fields, with the weight value of 1, expand equally to fill the space that remains after the contents of all three fields are measured.\n- If instead you have three text fields where two have a weight value of 1 and the third has a weight of 2, then the space that remains after the contents of all three fields are measured is allocated as follows: half to the field with the weight value of 2, and half divided equally between the fields with the weight value of 1.\n\nThe following figure and code snippet show how layout weights might work in a\n\"send message\" activity. The **To** field, **Subject** line, and\n**Send** button each take up only the height they need. The message area\ntakes up the rest of the activity's height.\n**Figure 2.** Three text fields and a button in a vertically oriented `LinearLayout`. \n\n```xml\n\u003c?xml version=\"1.0\" encoding=\"utf-8\"?\u003e\n\u003cLinearLayout xmlns:android=\"http://schemas.android.com/apk/res/android\"\n android:layout_width=\"match_parent\"\n android:layout_height=\"match_parent\"\n android:paddingLeft=\"16dp\"\n android:paddingRight=\"16dp\"\n android:orientation=\"vertical\" \u003e\n \u003cEditText\n android:layout_width=\"match_parent\"\n android:layout_height=\"wrap_content\"\n android:hint=\"@string/to\" /\u003e\n \u003cEditText\n android:layout_width=\"match_parent\"\n android:layout_height=\"wrap_content\"\n android:hint=\"@string/subject\" /\u003e\n \u003cEditText\n android:layout_width=\"match_parent\"\n android:layout_height=\"0dp\"\n android:layout_weight=\"1\"\n android:gravity=\"top\"\n android:hint=\"@string/message\" /\u003e\n \u003cButton\n android:layout_width=\"100dp\"\n android:layout_height=\"wrap_content\"\n android:layout_gravity=\"end\"\n android:text=\"@string/send\" /\u003e\n\u003c/LinearLayout\u003e\n```\n\nFor details about the attributes available to each child view of a\n`LinearLayout`, see\n[LinearLayout.LayoutParams](/reference/android/widget/LinearLayout.LayoutParams)."]]