Android UI设计模式

<?xml version="1.0" encoding="utf-8"?>
<merge
xmlns:android="http://schemas.android.com/apk/res/android">
<include
layout="@layout/background" />
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<include
layout="@layout/navigator" />
<include
layout="@layout/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0" />
<include
layout="@layout/tab" />
</LinearLayout>
</merge>

<?xml version="1.0" encoding="utf-8"?>
<ImageView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/background"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitXY"
android:background="@color/background" />

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="64dp"
android:gravity="center_vertical"
style="@android:style/ButtonBar">
<Button
android:id="@+id/button_back"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:text="@string/back" />
<Button
android:id="@+id/button_home"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_alignParentRight="true" />
<TextView
android:id="@android:id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/button_back"
android:layout_toLeftOf="@id/button_home"
android:gravity="center"
android:singleLine="true"
android:ellipsize="marquee"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<ListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="@android:color/transparent"
android:drawSelectorOnTop="false"
android:listSelector="@drawable/list_selector_background"
android:divider="@color/stroke"
android:dividerHeight="@dimen/line_width" />

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight">
<ImageButton
android:id="@+id/tab_profile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab_profile"
android:layout_weight="1.0"
android:background="@drawable/bg_btn" />
<ImageButton
android:id="@+id/tab_friends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:src="@drawable/tab_friends"
android:background="@drawable/bg_btn" />
<ImageButton
android:id="@+id/tab_games"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:src="@drawable/tab_games"
android:background="@drawable/bg_btn" />
</LinearLayout>