how to show the game start page in centre
<p>I think my question is quit easy,so thanks for your help.I have made a simple game ,finally run ,but I can't make the start content show in center of the page,could anyone help me out of this?</p>

<p>this is present page:</p>

<p>please enter here to see the <a href="http://img.my.csdn.net/uploads/201212/05/1354694765_6594.jpg" rel="nofollow">rendering</a>
code:</p>

<p>res/layout/activity.xml</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
    &lt;LinearLayout
        android:background="@color/background"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="horizontal"
        xmlns:android="http://schemas.android.com/apk/res/android"&gt;
        &lt;LinearLayout
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_gravity="center"&gt;
            &lt;TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:textSize="25sp"
                android:textColor="#7ba6df"
                android:text="@string/activity_main_title"/&gt;
            &lt;Button
                android:id="@+id/continue_button"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="@string/continue_lable"/&gt;
            &lt;Button
                android:id="@+id/new_button"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="@string/new_game_lable"/&gt;
            &lt;Button
                android:id="@+id/about_button"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="@string/about_lable"/&gt;
            &lt;Button
                android:id="@+id/exit_button"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="@string/exit_lable"/&gt;
        &lt;/LinearLayout&gt;
    &lt;/LinearLayout&gt;
</code></pre>

<p>res/values/string.xml</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;
    &lt;string name="activity_main_title"&gt;android sudoku&lt;/string&gt;
    &lt;string name="continue_lable"&gt;开始游戏&lt;/string&gt;
    &lt;string name="about_lable"&gt;游戏说明&lt;/string&gt;
    &lt;string name="new_game_lable"&gt;是否开启音乐&lt;/string&gt;
    &lt;string name="exit_lable"&gt;退出游戏&lt;/string&gt;

&lt;/resources&gt;
</code></pre>

<p>Mainactivity.java</p>

<pre><code>public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}
</code></pre>
