Eclipse 开发 Android, LinearLayout (学习2)

A LinearLayout is a GroupView that will lay child View elements vertically or horizontally.

Start a new project/Activity called HelloLinearLayout.

Open the layout file. Make it like so:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <LinearLayoutandroid:orientation="horizontal"android:layout_width="fill_parent"android:layout_height="fill_parent"android:layout_weight="1"><TextView    android:text="red"    android:gravity="center_horizontal"    android:background="#aa0000"    android:layout_width="wrap_content"    android:layout_height="fill_parent"    android:layout_weight="1"/><TextView    android:text="green"    android:gravity="center_horizontal"    android:background="#00aa00"    android:layout_width="wrap_content"    android:layout_height="fill_parent"    android:layout_weight="1"/><TextView    android:text="blue"    android:gravity="center_horizontal"    android:background="#0000aa"    android:layout_width="wrap_content"    android:layout_height="fill_parent"    android:layout_weight="1"/><TextView    android:text="yellow"    android:gravity="center_horizontal"    android:background="#aaaa00"    android:layout_width="wrap_content"    android:layout_height="fill_parent"    android:layout_weight="1"/>    </LinearLayout>    <LinearLayoutandroid:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:layout_weight="1"><TextView    android:text="row one"    android:textSize="15pt"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_weight="1"/><TextView    android:text="row two"    android:textSize="15pt"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_weight="1"/><TextView    android:text="row three"    android:textSize="15pt"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_weight="1"/><TextView    android:text="row four"    android:textSize="15pt"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_weight="1"/>            </LinearLayout>        </LinearLayout>

Carefully inspect the XML. You'll notice how this layout works a lot like an HTML layout. There is one parent LinearLayout that is defined to lay its child elements vertically. The first child is another LinearLayout that uses a horizontal layout and the second uses a vertical layout. Each LinearLayout contains several TextView elements.

Now open the HelloLinearLayout Activity and be sure it loads this layout in the onCreate() method:
```
public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);}
```
R.layout.main refers to the main.xml layout file.
Run it.

You should see the following:

链接地址：http://androidappdocs.appspot.com/guide/tutorials/views/hello-linearlayout.html

备注：LinearLayout 是线布局，orientation="horizontal" ：水平排列；orientation=" vertical" ：垂直排列

理解：布局的概念类似于框架，如果定制布局风格，那么里面的任何组件，都将以该风格排列。例如：水平排列，那么

就将组件一个挨一个的摆放在一个水平线上。（个人理解）

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