在開發Android過程中，有時已有的Loyout布局不能完全滿足設計需求，這時需要在已有的Layout基礎上上進行擴展，以達到通過配置文件描述布局的設計原則。

首先第一一個布局類，重寫其onDraw方法。

Java代碼??

public?static?class?iRelativeLayout?extends?RelativeLayout??

????{??

????????private?Paint???mPaint;??

????????private?Rect????mRect;??

??

????????public?iRelativeLayout(?Context?context,?AttributeSet?attrs?)?{??

????????????super(context,?attrs);??

??

????????????mRect?=?new?Rect();??

????????????mPaint?=?new?Paint();??

??

????????????mPaint.setStyle(Paint.Style.FILL_AND_STROKE);??

????????????mPaint.setColor(0xFFCBD2D8);??

????????}??

??

????????@Override??

????????protected?void?onDraw(Canvas?canvas)??

????????{??

????????????super.onDraw(canvas);??

??

????????????canvas.drawColor(0xFFC5CCD4);??

??

????????????this.getDrawingRect(mRect);??

??

????????????for?(int?i?=?0;?i?<?mRect.right;?i?+=?7)??

????????????{??

????????????????canvas.drawRect(mRect.left?+?i,?mRect.top,?mRect.left?+?i?+?2,??

????????????????????????mRect.bottom,?mPaint);??

????????????}??

??

????????}??

????}??

?其次，在布局配置文件中引用：

<?xml version="1.0" encoding="utf-8"?>

?

<view xmlns:android="http://schemas.android.com/apk/res/android"

class="iRelativeLayout"

?? ?android:orientation="vertical"

?? ?android:layout_width="fill_parent"

?? ?android:layout_height="fill_parent"

?? ?android:background = "#C5CCD4FF"

>

<LinearLayout

android:id = "@+id/TabLayout_One"

android:layout_width = "fill_parent"

android:layout_height = "fill_parent"

android:layout_above = "@+id/Tabs"

>

<ScrollView android:layout_width="fill_parent" android:layout_height="wrap_content">

<RelativeLayout

android:layout_width = "fill_parent"

android:layout_height = "fill_parent"

android:visibility = "visible"

>

<Button

android:id = "@+id/ButtonOne"

android:layout_width = "wrap_content"

android:layout_height = "fill_parent"

android:text = "h3h3h3"

/>

<Button

android:id = "@+id/ButtonTwo"

android:layout_width = "wrap_content"

android:layout_height = "wrap_content"

android:text = "11222"

android:layout_below ="@+id/ButtonOne"

/>

<Button

android:id = "@+id/ButtonThree"

android:layout_width = "wrap_content"

android:layout_height = "wrap_content"

android:text = "wass"

android:layout_below ="@+id/ButtonTwo"

/>

</RelativeLayout>

</ScrollView>

</LinearLayout>

</view>

最后，和其他布局一樣使用即可。

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