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-page.title=Hello, LinearLayout
-parent.title=Hello, Views
-parent.link=index.html
-@jd:body
-
-<p>A {@link android.widget.LinearLayout} is a GroupView that will lay child View elements
-vertically or horizontally.</p>
-
-
-<ol>
- <li>Start a new project/Activity called HelloLinearLayout.</li>
- <li>Open the layout file.
- Make it like so:
-<pre>
-&lt;?xml version="1.0" encoding="utf-8"?>
-&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
-
- &lt;LinearLayout
- android:orientation="horizontal"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:layout_weight="1">
-
- &lt;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"/>
-
- &lt;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"/>
-
- &lt;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"/>
-
- &lt;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"/>
-
- &lt;/LinearLayout>
-
- &lt;LinearLayout
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:layout_weight="1">
-
- &lt;TextView
- android:text="row one"
- android:textSize="15pt"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_weight="1"/>
-
- &lt;TextView
- android:text="row two"
- android:textSize="15pt"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_weight="1"/>
-
- &lt;TextView
- android:text="row three"
- android:textSize="15pt"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_weight="1"/>
-
- &lt;TextView
- android:text="row four"
- android:textSize="15pt"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_weight="1"/>
-
- &lt;/LinearLayout>
-
-&lt;/LinearLayout>
-</pre>
- <p>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 {@link android.widget.TextView}
- elements.</p>
-</li>
-<li>Now open the HelloLinearLayout Activity and be sure it loads this layout in the <code>onCreate()</code> method:</p>
-<pre>
-public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
-}
-</pre>
-<p><code>R.layout.main</code> refers to the <code>main.xml</code> layout file.</p>
-</li>
-<li>Run it.</li>
-</ol>
-<p>You should see the following:</p>
-<img src="images/hello-linearlayout.png" width="150px" />
-
-<p>Notice how the various XML attributes define the View's behavior.
-Pay attention to the effect of the <code>layout_weight</code>. Try
- experimenting with different values to see how the screen real estate is
- distributed based on the weight of each element.</p>
-
-<h3>References</h3>
-<ul>
- <li>{@link android.widget.LinearLayout}</li>
-<li>{@link android.widget.TextView}</li>
-</ul>
-
-