增加条目触摸背景的设置，可以增加触摸背景色变化和水波纹效果

demo/src/main/res/drawable-v21/selector_bg.xml

+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+        android:color="@color/selector_grey">
+    <item android:drawable="@color/tab_gb"/>
+</ripple>
\ No newline at end of file

demo/src/main/res/drawable/selector_bg.xml

+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/selector_grey" android:state_pressed="true"/>
+    <item android:drawable="@color/tab_gb"/>
+</selector>
\ No newline at end of file

demo/src/main/res/layout/activity_main.xml

@@ -35,6 +35,8 @@
             app:textColorSelected="@color/tab_selected_color"
             app:itemTextSize="8sp"
             app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
             />
 
         <com.chaychan.library.BottomBarItem
@@ -48,6 +50,8 @@
             app:textColorSelected="@color/tab_selected_color"
             app:itemTextSize="8sp"
             app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
             />
 
 
@@ -62,6 +66,8 @@
             app:textColorSelected="@color/tab_selected_color"
             app:itemTextSize="8sp"
             app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
             />
 
         <com.chaychan.library.BottomBarItem
@@ -75,6 +81,8 @@
             app:textColorSelected="@color/tab_selected_color"
             app:itemTextSize="8sp"
             app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
             />
 
     </com.chaychan.library.BottomBarLayout>

demo/src/main/res/values/colors.xml

@@ -7,4 +7,5 @@
     <color name="tab_gb">#F3F5F4</color>
     <color name="tab_normal_color">#515051</color>
     <color name="tab_selected_color">#D33D3C</color>
+
 </resources>

library/src/main/java/com/chaychan/library/BottomBarItem.java

@@ -2,6 +2,7 @@ package com.chaychan.library;
 
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.graphics.drawable.Drawable;
 import android.support.annotation.Nullable;
 import android.util.AttributeSet;
 import android.view.Gravity;
@@ -28,9 +29,14 @@ public class BottomBarItem extends LinearLayout {
     private int mTextColorNormal = 0xFF999999;    //描述文本的默认显示颜色
     private int mTextColorSelected = 0xFF46C01B;  //述文本的默认选中显示颜色
     private int mMarginTop = 0;//文字和图标的距离,默认0dp
+    private boolean mOpenTouchBg = false;// 是否开启触摸背景，默认关闭
+    private Drawable mTouchDrawable;//触摸时的背景
+
     private TextView mTextView;
     private ImageView mImageView;
 
+
+
     public BottomBarItem(Context context) {
         this(context, null);
     }
@@ -56,6 +62,10 @@ public class BottomBarItem extends LinearLayout {
         mTextColorSelected = ta.getColor(R.styleable.BottomBarItem_textColorSelected, mTextColorSelected);
 
         mMarginTop = ta.getDimensionPixelSize(R.styleable.BottomBarItem_itemMarginTop, UIUtils.dip2Px(mContext, mMarginTop));
+
+        mOpenTouchBg = ta.getBoolean(R.styleable.BottomBarItem_openTouchBg, mOpenTouchBg);
+        mTouchDrawable = ta.getDrawable(R.styleable.BottomBarItem_touchDrawable);
+
         ta.recycle();
 
         checkValues();
@@ -73,6 +83,11 @@ public class BottomBarItem extends LinearLayout {
         if (mIconSelectedResourceId == -1) {
             throw new IllegalStateException("您还没有设置选中状态下的图标，请指定iconSelected的图标");
         }
+
+        if (mOpenTouchBg && mTouchDrawable == null){
+            //如果有开启触摸背景效果但是没有传对应的drawable
+            throw new IllegalStateException("开启了触摸效果，但是没有指定touchDrawable");
+        }
     }
 
     private void init() {
@@ -92,6 +107,11 @@ public class BottomBarItem extends LinearLayout {
         layoutParams.topMargin = mMarginTop;
         mTextView.setLayoutParams(layoutParams);
 
+        if (mOpenTouchBg){
+            //如果有开启触摸背景
+            setBackground(mTouchDrawable);
+        }
+
         addView(view);
     }
 

library/src/main/res/values/attr.xml

@@ -15,5 +15,9 @@
         <attr name="textColorSelected" format="color"/>
         <!--文字和图标的顶部距离-->
         <attr name="itemMarginTop" format="dimension"/>
+        <!--是否开启触摸背景效果-->
+        <attr name="openTouchBg" format="boolean"/>
+        <!--设置触摸背景-->
+        <attr name="touchDrawable" format="reference"/>
     </declare-styleable>
 </resources>
\ No newline at end of file

library/src/main/res/values/colors.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="white">#ffffff</color>
+    <color name="selector_grey">#DDDDDD</color>
+</resources>
\ No newline at end of file