1.去除一定要设置ViewPager的问题，修改成可设置或不设置；2.修改点击回调，回调previousPosition和currentPosition;3.添加两种使用方式的demo演示

demo/src/main/AndroidManifest.xml

@@ -9,6 +9,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
+
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
@@ -16,6 +17,12 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+
+        <activity android:name=".ViewPagerActivity">
+        </activity>
+
+        <activity android:name=".FragmentManagerActivity">
+        </activity>
     </application>
 
 </manifest>
\ No newline at end of file

demo/src/main/java/com/chaychan/bottombarlayout/FragmentManagerActivity.java

+package com.chaychan.bottombarlayout;
+
+import android.os.Bundle;
+import android.os.Handler;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.view.animation.Animation;
+import android.view.animation.RotateAnimation;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+
+import com.chaychan.library.BottomBarItem;
+import com.chaychan.library.BottomBarLayout;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class FragmentManagerActivity extends AppCompatActivity {
+
+    private List<TabFragment> mFragmentList = new ArrayList<>();
+    private FrameLayout mFlContent;
+    private BottomBarLayout mBottomBarLayout;
+    private RotateAnimation mRotateAnimation;
+    private Handler mHandler = new Handler();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_fragment_manager);
+
+        initView();
+        initData();
+        initListener();
+    }
+
+    private void initView() {
+        mFlContent = (FrameLayout) findViewById(R.id.fl_content);
+        mBottomBarLayout = (BottomBarLayout) findViewById(R.id.bbl);
+    }
+
+    private void initData() {
+
+        TabFragment homeFragment = new TabFragment();
+        Bundle bundle1 = new Bundle();
+        bundle1.putString(TabFragment.CONTENT, "首页");
+        homeFragment.setArguments(bundle1);
+        mFragmentList.add(homeFragment);
+
+        TabFragment videoFragment = new TabFragment();
+        Bundle bundle2 = new Bundle();
+        bundle2.putString(TabFragment.CONTENT, "视频");
+        videoFragment.setArguments(bundle2);
+        mFragmentList.add(videoFragment);
+
+        TabFragment microFragment = new TabFragment();
+        Bundle bundle3 = new Bundle();
+        bundle3.putString(TabFragment.CONTENT, "微头条");
+        microFragment.setArguments(bundle3);
+        mFragmentList.add(microFragment);
+
+        TabFragment meFragment = new TabFragment();
+        Bundle bundle4 = new Bundle();
+        bundle4.putString(TabFragment.CONTENT, "我的");
+        meFragment.setArguments(bundle4);
+        mFragmentList.add(meFragment);
+
+        changeFragment(0); //默认显示第一页
+    }
+
+    private void initListener() {
+        mBottomBarLayout.setOnItemSelectedListener(new BottomBarLayout.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(final BottomBarItem bottomBarItem, int previousPosition, final int currentPosition) {
+                Log.i("MainActivity", "position: " + currentPosition);
+
+                changeFragment(currentPosition);
+
+                if (currentPosition == 0) {
+                    //如果是第一个，即首页
+                    if (previousPosition == currentPosition) {
+                        //如果是在原来位置上点击,更换首页图标并播放旋转动画
+                        bottomBarItem.setIconSelectedResourceId(R.mipmap.tab_loading);//更换成加载图标
+                        bottomBarItem.setStatus(true);
+
+                        //播放旋转动画
+                        if (mRotateAnimation == null) {
+                            mRotateAnimation = new RotateAnimation(0, 360,
+                                    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
+                                    0.5f);
+                            mRotateAnimation.setDuration(800);
+                            mRotateAnimation.setRepeatCount(-1);
+                        }
+                        ImageView bottomImageView = bottomBarItem.getImageView();
+                        bottomImageView.setAnimation(mRotateAnimation);
+                        bottomImageView.startAnimation(mRotateAnimation);//播放旋转动画
+
+                        //模拟数据刷新完毕
+                        mHandler.postDelayed(new Runnable() {
+                            @Override
+                            public void run() {
+                                boolean tabNotChanged = mBottomBarLayout.getCurrentItem() == currentPosition; //是否还停留在当前页签
+                                bottomBarItem.setIconSelectedResourceId(R.mipmap.tab_home_selected);//更换成首页原来选中图标
+                                bottomBarItem.setStatus(tabNotChanged);//刷新图标
+                                cancelTabLoading(bottomBarItem);
+                            }
+                        }, 3000);
+                        return;
+                    }
+                }
+
+                //如果点击了其他条目
+                BottomBarItem bottomItem = mBottomBarLayout.getBottomItem(0);
+                bottomItem.setIconSelectedResourceId(R.mipmap.tab_home_selected);//更换为原来的图标
+                cancelTabLoading(bottomItem);//停止旋转动画
+            }
+        });
+
+        mBottomBarLayout.setUnread(0, 20);//设置第一个页签的未读数为20
+        mBottomBarLayout.setUnread(1, 1001);//设置第二个页签的未读数
+        mBottomBarLayout.showNotify(2);//设置第三个页签显示提示的小红点
+        mBottomBarLayout.setMsg(3, "NEW");//设置第四个页签显示NEW提示文字
+    }
+
+    private void changeFragment(int currentPosition) {
+        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
+        transaction.replace(R.id.fl_content, mFragmentList.get(currentPosition));
+        transaction.commit();
+    }
+
+    /**
+     * 停止首页页签的旋转动画
+     */
+    private void cancelTabLoading(BottomBarItem bottomItem) {
+        Animation animation = bottomItem.getImageView().getAnimation();
+        if (animation != null) {
+            animation.cancel();
+        }
+    }
+}

demo/src/main/java/com/chaychan/bottombarlayout/MainActivity.java

 package com.chaychan.bottombarlayout;
 
+import android.content.Intent;
 import android.os.Bundle;
-import android.os.Handler;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentActivity;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentStatePagerAdapter;
-import android.support.v4.view.ViewPager;
-import android.util.Log;
-import android.view.animation.Animation;
-import android.view.animation.RotateAnimation;
-import android.widget.ImageView;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
 
-import com.chaychan.library.BottomBarItem;
-import com.chaychan.library.BottomBarLayout;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class MainActivity extends FragmentActivity {
-
-    private ViewPager mVpContent;
-    private BottomBarLayout mBottomBarLayout;
-
-    private List<TabFragment> mFragmentList = new ArrayList<>();
-    private RotateAnimation mRotateAnimation;
-    private Handler mHandler = new Handler();
+public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-
-        initView();
-        initData();
-        initListener();
-    }
-
-    private void initView() {
-        mVpContent = (ViewPager) findViewById(R.id.vp_content);
-        mBottomBarLayout = (BottomBarLayout) findViewById(R.id.bbl);
     }
 
-    private void initData() {
-
-        TabFragment homeFragment = new TabFragment();
-        Bundle bundle1 = new Bundle();
-        bundle1.putString(TabFragment.CONTENT,"首页");
-        homeFragment.setArguments(bundle1);
-        mFragmentList.add(homeFragment);
-
-        TabFragment videoFragment = new TabFragment();
-        Bundle bundle2 = new Bundle();
-        bundle2.putString(TabFragment.CONTENT,"视频");
-        videoFragment.setArguments(bundle2);
-        mFragmentList.add(videoFragment);
-
-        TabFragment microFragment = new TabFragment();
-        Bundle bundle3 = new Bundle();
-        bundle3.putString(TabFragment.CONTENT,"微头条");
-        microFragment.setArguments(bundle3);
-        mFragmentList.add(microFragment);
-
-        TabFragment meFragment = new TabFragment();
-        Bundle bundle4 = new Bundle();
-        bundle4.putString(TabFragment.CONTENT,"我的");
-        meFragment.setArguments(bundle4);
-        mFragmentList.add(meFragment);
+    public void useVp(View view){
+        startActivity(new Intent(this,ViewPagerActivity.class));
     }
 
-    private void initListener() {
-        mVpContent.setAdapter(new MyAdapter(getSupportFragmentManager()));
-        mBottomBarLayout.setViewPager(mVpContent);
-        mBottomBarLayout.setOnItemSelectedListener(new BottomBarLayout.OnItemSelectedListener() {
-            @Override
-            public void onItemSelected(final BottomBarItem bottomBarItem, int position) {
-                Log.i("MainActivity","position: " + position);
-                if (position == 0){
-                    //如果是第一个，即首页
-                    if (mBottomBarLayout.getCurrentItem() == position){
-                        //如果是在原来位置上点击,更换首页图标并播放旋转动画
-                        bottomBarItem.setIconSelectedResourceId(R.mipmap.tab_loading);//更换成加载图标
-                        bottomBarItem.setStatus(true);
-
-                        //播放旋转动画
-                        if (mRotateAnimation == null) {
-                            mRotateAnimation = new RotateAnimation(0, 360,
-                                    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
-                                    0.5f);
-                            mRotateAnimation.setDuration(800);
-                            mRotateAnimation.setRepeatCount(-1);
-                        }
-                        ImageView bottomImageView = bottomBarItem.getImageView();
-                        bottomImageView.setAnimation(mRotateAnimation);
-                        bottomImageView.startAnimation(mRotateAnimation);//播放旋转动画
-
-                        //模拟数据刷新完毕
-                        mHandler.postDelayed(new Runnable() {
-                            @Override
-                            public void run() {
-                                bottomBarItem.setIconSelectedResourceId(R.mipmap.tab_home_selected);//更换成首页原来图标
-                                bottomBarItem.setStatus(true);//刷新图标
-                                cancelTabLoading(bottomBarItem);
-                            }
-                        },3000);
-                        return;
-                    }
-                }
-
-                //如果点击了其他条目
-                BottomBarItem bottomItem = mBottomBarLayout.getBottomItem(0);
-                bottomItem.setIconSelectedResourceId(R.mipmap.tab_home_selected);//更换为原来的图标
-
-                cancelTabLoading(bottomItem);//停止旋转动画
-            }
-        });
-
-        mBottomBarLayout.setUnread(0,20);//设置第一个页签的未读数为20
-        mBottomBarLayout.setUnread(1,1001);//设置第二个页签的未读数
-        mBottomBarLayout.showNotify(2);//设置第三个页签显示提示的小红点
-        mBottomBarLayout.setMsg(3,"NEW");//设置第四个页签显示NEW提示文字
-    }
-
-    /**停止首页页签的旋转动画*/
-    private void cancelTabLoading(BottomBarItem bottomItem) {
-        Animation animation = bottomItem.getImageView().getAnimation();
-        if (animation != null){
-            animation.cancel();
-        }
-    }
-
-    class MyAdapter extends FragmentStatePagerAdapter {
-
-        public MyAdapter(FragmentManager fm) {
-            super(fm);
-        }
-
-        @Override
-        public Fragment getItem(int position) {
-            return mFragmentList.get(position);
-        }
-
-        @Override
-        public int getCount() {
-            return mFragmentList.size();
-        }
+    public void noUseVp(View view){
+        startActivity(new Intent(this,FragmentManagerActivity.class));
     }
 }

demo/src/main/java/com/chaychan/bottombarlayout/ViewPagerActivity.java

+package com.chaychan.bottombarlayout;
+
+import android.os.Bundle;
+import android.os.Handler;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.util.Log;
+import android.view.animation.Animation;
+import android.view.animation.RotateAnimation;
+import android.widget.ImageView;
+
+import com.chaychan.library.BottomBarItem;
+import com.chaychan.library.BottomBarLayout;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ViewPagerActivity extends FragmentActivity {
+
+    private ViewPager mVpContent;
+    private BottomBarLayout mBottomBarLayout;
+
+    private List<TabFragment> mFragmentList = new ArrayList<>();
+    private RotateAnimation mRotateAnimation;
+    private Handler mHandler = new Handler();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_view_pager);
+
+        initView();
+        initData();
+        initListener();
+    }
+
+    private void initView() {
+        mVpContent = (ViewPager) findViewById(R.id.vp_content);
+        mBottomBarLayout = (BottomBarLayout) findViewById(R.id.bbl);
+    }
+
+    private void initData() {
+
+        TabFragment homeFragment = new TabFragment();
+        Bundle bundle1 = new Bundle();
+        bundle1.putString(TabFragment.CONTENT,"首页");
+        homeFragment.setArguments(bundle1);
+        mFragmentList.add(homeFragment);
+
+        TabFragment videoFragment = new TabFragment();
+        Bundle bundle2 = new Bundle();
+        bundle2.putString(TabFragment.CONTENT,"视频");
+        videoFragment.setArguments(bundle2);
+        mFragmentList.add(videoFragment);
+
+        TabFragment microFragment = new TabFragment();
+        Bundle bundle3 = new Bundle();
+        bundle3.putString(TabFragment.CONTENT,"微头条");
+        microFragment.setArguments(bundle3);
+        mFragmentList.add(microFragment);
+
+        TabFragment meFragment = new TabFragment();
+        Bundle bundle4 = new Bundle();
+        bundle4.putString(TabFragment.CONTENT,"我的");
+        meFragment.setArguments(bundle4);
+        mFragmentList.add(meFragment);
+    }
+
+    private void initListener() {
+        mVpContent.setAdapter(new MyAdapter(getSupportFragmentManager()));
+        mBottomBarLayout.setViewPager(mVpContent);
+        mBottomBarLayout.setOnItemSelectedListener(new BottomBarLayout.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(final BottomBarItem bottomBarItem, int previousPosition, final int currentPosition) {
+                Log.i("MainActivity","position: " + currentPosition);
+                if (currentPosition == 0){
+                    //如果是第一个，即首页
+                    if (previousPosition == currentPosition){
+                        //如果是在原来位置上点击,更换首页图标并播放旋转动画
+                        bottomBarItem.setIconSelectedResourceId(R.mipmap.tab_loading);//更换成加载图标
+                        bottomBarItem.setStatus(true);
+
+                        //播放旋转动画
+                        if (mRotateAnimation == null) {
+                            mRotateAnimation = new RotateAnimation(0, 360,
+                                    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
+                                    0.5f);
+                            mRotateAnimation.setDuration(800);
+                            mRotateAnimation.setRepeatCount(-1);
+                        }
+                        ImageView bottomImageView = bottomBarItem.getImageView();
+                        bottomImageView.setAnimation(mRotateAnimation);
+                        bottomImageView.startAnimation(mRotateAnimation);//播放旋转动画
+
+                        //模拟数据刷新完毕
+                        mHandler.postDelayed(new Runnable() {
+                            @Override
+                            public void run() {
+                                boolean tabNotChanged = mBottomBarLayout.getCurrentItem() == currentPosition; //是否还停留在当前页签
+                                bottomBarItem.setIconSelectedResourceId(R.mipmap.tab_home_selected);//更换成首页原来选中图标
+                                bottomBarItem.setStatus(tabNotChanged);//刷新图标
+                                cancelTabLoading(bottomBarItem);
+                            }
+                        },3000);
+                        return;
+                    }
+                }
+
+                //如果点击了其他条目
+                BottomBarItem bottomItem = mBottomBarLayout.getBottomItem(0);
+                bottomItem.setIconSelectedResourceId(R.mipmap.tab_home_selected);//更换为原来的图标
+
+                cancelTabLoading(bottomItem);//停止旋转动画
+            }
+        });
+
+        mBottomBarLayout.setUnread(0,20);//设置第一个页签的未读数为20
+        mBottomBarLayout.setUnread(1,1001);//设置第二个页签的未读数
+        mBottomBarLayout.showNotify(2);//设置第三个页签显示提示的小红点
+        mBottomBarLayout.setMsg(3,"NEW");//设置第四个页签显示NEW提示文字
+    }
+
+    /**停止首页页签的旋转动画*/
+    private void cancelTabLoading(BottomBarItem bottomItem) {
+        Animation animation = bottomItem.getImageView().getAnimation();
+        if (animation != null){
+            animation.cancel();
+        }
+    }
+
+    class MyAdapter extends FragmentStatePagerAdapter {
+
+        public MyAdapter(FragmentManager fm) {
+            super(fm);
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            return mFragmentList.get(position);
+        }
+
+        @Override
+        public int getCount() {
+            return mFragmentList.size();
+        }
+    }
+}

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

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    >
+
+    <FrameLayout
+        android:id="@+id/fl_content"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        />
+
+    <com.chaychan.library.BottomBarLayout
+        android:id="@+id/bbl"
+        android:layout_width="match_parent"
+        android:layout_height="45dp"
+        android:orientation="horizontal"
+        android:gravity="center"
+        android:layout_gravity="center"
+        android:background="@color/tab_gb"
+        >
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_home_normal"
+            app:iconSelected="@mipmap/tab_home_selected"
+            app:itemText="首页"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_video_normal"
+            app:iconSelected="@mipmap/tab_video_selected"
+            app:itemText="视频"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:unreadThreshold="999"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_micro_normal"
+            app:iconSelected="@mipmap/tab_micro_selected"
+            app:itemText="微头条"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_me_normal"
+            app:iconSelected="@mipmap/tab_me_selected"
+            app:itemText="我的"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+    </com.chaychan.library.BottomBarLayout>
+
+</LinearLayout>

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

 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
+<RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="vertical"
     >
 
-    <android.support.v4.view.ViewPager
-        android:id="@+id/vp_content"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1"
-        ></android.support.v4.view.ViewPager>
-
-    <com.chaychan.library.BottomBarLayout
-        android:id="@+id/bbl"
-        android:layout_width="match_parent"
-        android:layout_height="45dp"
-        android:orientation="horizontal"
-        android:gravity="center"
-        android:layout_gravity="center"
-        android:background="@color/tab_gb"
-        >
-
-        <com.chaychan.library.BottomBarItem
-            android:layout_width="0dp"
-            android:layout_weight="1"
-            android:layout_height="match_parent"
-            app:iconNormal="@mipmap/tab_home_normal"
-            app:iconSelected="@mipmap/tab_home_selected"
-            app:itemText="首页"
-            app:textColorNormal="@color/tab_normal_color"
-            app:textColorSelected="@color/tab_selected_color"
-            app:itemTextSize="8sp"
-            app:itemMarginTop="-5dp"
-            app:openTouchBg="true"
-            app:touchDrawable="@drawable/selector_bg"
-            />
-
-        <com.chaychan.library.BottomBarItem
-            android:layout_width="0dp"
-            android:layout_weight="1"
-            android:layout_height="match_parent"
-            app:iconNormal="@mipmap/tab_video_normal"
-            app:iconSelected="@mipmap/tab_video_selected"
-            app:itemText="视频"
-            app:textColorNormal="@color/tab_normal_color"
-            app:textColorSelected="@color/tab_selected_color"
-            app:itemTextSize="8sp"
-            app:itemMarginTop="-5dp"
-            app:openTouchBg="true"
-            app:unreadThreshold="999"
-            app:touchDrawable="@drawable/selector_bg"
-            />
-
-
-        <com.chaychan.library.BottomBarItem
-            android:layout_width="0dp"
-            android:layout_weight="1"
-            android:layout_height="match_parent"
-            app:iconNormal="@mipmap/tab_micro_normal"
-            app:iconSelected="@mipmap/tab_micro_selected"
-            app:itemText="微头条"
-            app:textColorNormal="@color/tab_normal_color"
-            app:textColorSelected="@color/tab_selected_color"
-            app:itemTextSize="8sp"
-            app:itemMarginTop="-5dp"
-            app:openTouchBg="true"
-            app:touchDrawable="@drawable/selector_bg"
-            />
-
-        <com.chaychan.library.BottomBarItem
-            android:layout_width="0dp"
-            android:layout_weight="1"
-            android:layout_height="match_parent"
-            app:iconNormal="@mipmap/tab_me_normal"
-            app:iconSelected="@mipmap/tab_me_selected"
-            app:itemText="我的"
-            app:textColorNormal="@color/tab_normal_color"
-            app:textColorSelected="@color/tab_selected_color"
-            app:itemTextSize="8sp"
-            app:itemMarginTop="-5dp"
-            app:openTouchBg="true"
-            app:touchDrawable="@drawable/selector_bg"
-            />
-
-    </com.chaychan.library.BottomBarLayout>
-
-</LinearLayout>
+    <Button
+        android:id="@+id/btn1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="使用ViewPager"
+        android:textAllCaps="false"
+        android:layout_centerInParent="true"
+        android:onClick="useVp"
+        />
+
+    <Button
+        android:layout_below="@+id/btn1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="不使用ViewPager"
+        android:textAllCaps="false"
+        android:layout_centerInParent="true"
+        android:layout_marginTop="10dp"
+        android:onClick="noUseVp"
+        />
+
+
+</RelativeLayout>

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

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    >
+
+    <android.support.v4.view.ViewPager
+        android:id="@+id/vp_content"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        ></android.support.v4.view.ViewPager>
+
+    <com.chaychan.library.BottomBarLayout
+        android:id="@+id/bbl"
+        android:layout_width="match_parent"
+        android:layout_height="45dp"
+        android:orientation="horizontal"
+        android:gravity="center"
+        android:layout_gravity="center"
+        android:background="@color/tab_gb"
+        >
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_home_normal"
+            app:iconSelected="@mipmap/tab_home_selected"
+            app:itemText="首页"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_video_normal"
+            app:iconSelected="@mipmap/tab_video_selected"
+            app:itemText="视频"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:unreadThreshold="999"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_micro_normal"
+            app:iconSelected="@mipmap/tab_micro_selected"
+            app:itemText="微头条"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+        <com.chaychan.library.BottomBarItem
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="match_parent"
+            app:iconNormal="@mipmap/tab_me_normal"
+            app:iconSelected="@mipmap/tab_me_selected"
+            app:itemText="我的"
+            app:textColorNormal="@color/tab_normal_color"
+            app:textColorSelected="@color/tab_selected_color"
+            app:itemTextSize="8sp"
+            app:itemMarginTop="-5dp"
+            app:openTouchBg="true"
+            app:touchDrawable="@drawable/selector_bg"
+            />
+
+    </com.chaychan.library.BottomBarLayout>
+
+</LinearLayout>

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

@@ -42,7 +42,12 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
         TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.BottomBarLayout);
         mSmoothScroll = ta.getBoolean(R.styleable.BottomBarLayout_smoothScroll,false);
         ta.recycle();
+    }
 
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        init();
     }
 
     @Override
@@ -56,14 +61,14 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
     }
 
     private void init() {
-        if (mViewPager == null) {
-            throw new IllegalArgumentException("参数不能为空");
-        }
-
         mChildCount = getChildCount();
-        if (mViewPager.getAdapter().getCount() != mChildCount) {
-            throw new IllegalArgumentException("LinearLayout的子View数量必须和ViewPager条目数量一致");
+
+        if (mViewPager != null) {
+            if (mViewPager.getAdapter().getCount() != mChildCount) {
+                throw new IllegalArgumentException("LinearLayout的子View数量必须和ViewPager条目数量一致");
+            }
         }
+
         for (int i = 0; i < mChildCount; i++) {
             if (getChildAt(i) instanceof BottomBarItem) {
                 BottomBarItem bottomBarItem = (BottomBarItem) getChildAt(i);
@@ -76,7 +81,10 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
         }
 
         mItemViews.get(mCurrentItem).setStatus(true);//设置选中项
-        mViewPager.setOnPageChangeListener(this);
+
+        if (mViewPager != null){
+            mViewPager.setOnPageChangeListener(this);
+        }
     }
 
     @Override
@@ -89,7 +97,7 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
         resetState();
         mItemViews.get(position).setStatus(true);
         if (onItemSelectedListener != null){
-            onItemSelectedListener.onItemSelected(getBottomItem(position),position);
+            onItemSelectedListener.onItemSelected(getBottomItem(position),mCurrentItem,position);
         }
         mCurrentItem = position;//记录当前位置
     }
@@ -110,14 +118,33 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
         @Override
         public void onClick(View v) {
             //回调点击的位置
-            if (onItemSelectedListener != null && currentIndex == mCurrentItem) {
-                onItemSelectedListener.onItemSelected(getBottomItem(currentIndex),currentIndex);
+            if(mViewPager != null){
+                //有设置viewPager
+                if (currentIndex == mCurrentItem){
+                    //如果还是同个页签，使用setCurrentItem不会回调OnPageSelecte(),所以在此处需要回调点击监听
+                    if (onItemSelectedListener != null) {
+                        onItemSelectedListener.onItemSelected(getBottomItem(currentIndex),mCurrentItem,currentIndex);
+                    }
+                }else{
+                    mViewPager.setCurrentItem(currentIndex, mSmoothScroll);
+                }
+            }else{
+                //没有设置viewPager
+                if (onItemSelectedListener != null) {
+                    onItemSelectedListener.onItemSelected(getBottomItem(currentIndex),mCurrentItem,currentIndex);
+                }
+
+                updateTabState(currentIndex);
             }
-
-            mViewPager.setCurrentItem(currentIndex, mSmoothScroll);
         }
     }
 
+    private void updateTabState(int position){
+        resetState();
+        mCurrentItem = position;
+        mItemViews.get(mCurrentItem).setStatus(true);
+    }
+
     /**
      * 重置当前按钮的状态
      */
@@ -128,7 +155,11 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
     }
 
     public void setCurrentItem(int currentItem) {
-        mViewPager.setCurrentItem(currentItem,mSmoothScroll);
+        if (mViewPager != null){
+            mViewPager.setCurrentItem(currentItem,mSmoothScroll);
+        }else{
+            updateTabState(currentItem);
+        }
     }
 
     /**
@@ -217,7 +248,7 @@ public class BottomBarLayout extends LinearLayout implements ViewPager.OnPageCha
     private OnItemSelectedListener onItemSelectedListener;
 
     public interface OnItemSelectedListener {
-        void onItemSelected(BottomBarItem bottomBarItem, int position);
+        void onItemSelected(BottomBarItem bottomBarItem, int previousPosition,int currentPosition);
     }
 
     public void setOnItemSelectedListener(OnItemSelectedListener onItemSelectedListener) {