<!-- 方法一 -->
<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="16dp" >
<shape android:shape="rectangle" >
<solid android:color="#f00" />
</shape>
</inset>
<!-- 方法二 -->
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:left="16dp">
<shape android:shape="rectangle">
<solid android:color="#f00" />
</shape>
</item>
</layer-list>

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
/**
* RecyclerView的ItemDecoration的默认实现
* 1. 默认使用系统的分割线
* 2. 支持自定义Drawable类型
* 3. 支持水平和垂直方向
* 4. 修复了官方垂直Divider显示的bug
* 扩展自官方android sdk下的Support7Demos下的DividerItemDecoration
*/
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private static final int[] ATTRS = new int[]{
android.R.attr.listDivider
};
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private Drawable mDivider;
private int mWidth;
private int mHeight;
private int mOrientation;
public DividerItemDecoration(Context context, int orientation) {
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
/**
* 新增：支持自定义dividerDrawable
*
* @param context
* @param orientation
* @param dividerDrawable
*/
public DividerItemDecoration(Context context, int orientation, Drawable dividerDrawable) {
mDivider = dividerDrawable;
setOrientation(orientation);
}
public void setOrientation(int orientation) {
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}
/**
* 新增：支持手动为无高宽的drawable制定宽度
* @param width
*/
public void setWidth(int width) {
this.mWidth = width;
}
/**
* 新增：支持手动为无高宽的drawable制定高度
* @param height
*/
public void setHeight(int height) {
this.mHeight = height;
}
@Override
public void onDraw(Canvas c, RecyclerView parent) {
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
public void drawVertical(Canvas c, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin +
Math.round(ViewCompat.getTranslationY(child));
final int bottom = top + getDividerHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int left = child.getRight() + params.rightMargin +
Math.round(ViewCompat.getTranslationX(child));
final int right = left + getDividerWidth();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
if (mOrientation == VERTICAL_LIST) {
outRect.set(0, 0, 0, getDividerHeight());
} else {
outRect.set(0, 0, getDividerWidth(), 0);
}
}
private int getDividerWidth() {
return mWidth > 0 ? mWidth : mDivider.getIntrinsicWidth();
}
private int getDividerHeight() {
return mHeight > 0 ? mHeight : mDivider.getIntrinsicHeight();
}
}

// 默认系统的divider
dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST);
// 自定义图片drawable分的divider
dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST, getResources().getDrawable(R.drawable.ic_launcher));
// 自定义无高宽的drawable的divider - 垂直列表
dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST, new ColorDrawable(Color.parseColor("#ff00ff")));
dividerItemDecoration.setHeight(1);
// 自定义无高宽的drawable的divider - 水平列表
dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST, new ColorDrawable(Color.parseColor("#ff00ff")));
dividerItemDecoration.setWidth(1);
// 自定义带边距且无高宽的drawable的divider（以上面InsetDrawable为例子）
// 这个地方也可以在drawable的xml文件设置size指定宽高，效果一样
dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST, getResources().getDrawable(R.drawable.list_divider));
dividerItemDecoration.setWidth(DisplayLess.$dp2px(16) + 1);

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--这个group_container的background一定要设置，
而且要和list_item_bg的list_item_normal一致，
否则效果会不正确。 -->
<LinearLayout
android:id="@+id/group_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="48dp"
android:background="#fff"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/account_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_item_bg"
android:clickable="true">
<TextView
android:id="@+id/account_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_margin="16dp"
android:text="First Item"
android:textColor="#f00"
android:textSize="16sp" />
</RelativeLayout>
<View
android:layout_width="match_parent"
android:layout_height="1px"
android:layout_marginLeft="16dp"
android:background="#f00" />
<RelativeLayout
android:id="@+id/phone_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_item_bg"
android:clickable="true">
<TextView
android:id="@+id/phone_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_margin="16dp"
android:text="Second Item"
android:textColor="#f00"
android:textSize="16sp" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import com.jayfeng.lesscode.core.R;
public class SpaceDividerView extends View {
private int mSpaceLeft = 0;
private int mSpaceTop = 0;
private int mSpaceRight = 0;
private int mSpaceBottom = 0;
private int mSpaceColor = Color.TRANSPARENT;
private Paint mPaint = new Paint();
public SpaceDividerView(Context context) {
this(context, null);
}
public SpaceDividerView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SpaceDividerView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SpaceDividerView, defStyleAttr, 0);
mSpaceLeft = a.getDimensionPixelSize(R.styleable.SpaceDividerView_spaceLeft,
(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0, getResources().getDisplayMetrics()));
mSpaceTop = a.getDimensionPixelSize(R.styleable.SpaceDividerView_spaceTop,
(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0, getResources().getDisplayMetrics()));
mSpaceRight = a.getDimensionPixelSize(R.styleable.SpaceDividerView_spaceRight,
(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0, getResources().getDisplayMetrics()));
mSpaceBottom = a.getDimensionPixelSize(R.styleable.SpaceDividerView_spaceBottom,
(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0, getResources().getDisplayMetrics()));
mSpaceColor = a.getColor(R.styleable.SpaceDividerView_spaceColor, Color.TRANSPARENT);
a.recycle();
mPaint.setColor(mSpaceColor);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mSpaceLeft > 0) {
canvas.drawRect(0, 0, mSpaceLeft, getMeasuredHeight(), mPaint);
}
if (mSpaceTop > 0) {
canvas.drawRect(0, 0, getMeasuredWidth(), mSpaceTop, mPaint);
}
if (mSpaceRight > 0) {
canvas.drawRect(getMeasuredWidth() - mSpaceRight, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);
}
if (mSpaceBottom > 0) {
canvas.drawRect(0, getMeasuredHeight() - mSpaceBottom, getMeasuredWidth(), getMeasuredHeight(), mPaint);
}
}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<LinearLayout
android:id="@+id/group_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="48dp"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/account_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_item_bg"
android:clickable="true">
<TextView
android:id="@+id/account_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_margin="16dp"
android:text="First Item"
android:textColor="#f00"
android:textSize="16sp" />
</RelativeLayout>
<com.jayfeng.lesscode.core.other.SpaceDividerView
android:layout_width="match_parent"
android:layout_height="1px"
android:background="#f00"
app:spaceLeft="16dp"
app:spaceColor="@color/list_item_normal"/>
<RelativeLayout
android:id="@+id/phone_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_item_bg"
android:clickable="true">
<TextView
android:id="@+id/phone_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_margin="16dp"
android:text="Second Item"
android:textColor="#f00"
android:textSize="16sp" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- layout_marginTop的值应该就是不包括阴影高度的header高度-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_marginTop="@dimen/header_height"
android:orientation="vertical">
</LinearLayout>
<!-- 这个要放在最后，才能显示在最上层，这个header里面包括一个阴影View-->
<include
android:id="@+id/header"
layout="@layout/include_header" />
</RelativeLayout>

<ListView android:id="@+id/listView"   
 android:layout_width="fill_parent"  
 android:layout_height="fill_parent"   
 android:divider="#FFF"  
 android:dividerHeight="1px"  
 android:layout_margin="10dip"/>