Use NoScrollViewPager instead of FragmentChangManager, add function t…

…o update fragment with position

bottom-navigation/src/main/java/com/chenshixin/bottomnavigation/BottomNavigation.kt

@@ -4,18 +4,19 @@ import android.content.Context
 import android.support.design.widget.CoordinatorLayout
 import android.support.v4.app.Fragment
 import android.support.v4.app.FragmentManager
+import android.support.v4.app.FragmentPagerAdapter
 import android.util.AttributeSet
 import android.view.LayoutInflater
 import android.view.ViewGroup
 import kotlinx.android.synthetic.main.bottom_navigation.view.*
+import java.util.*
 
 /**
+ * BottomNavigation
  * Created by chenshixin on 7/5/16.
  */
 class BottomNavigation(context: Context?, attrs: AttributeSet?) : CoordinatorLayout(context, attrs) {
 
-    var fragmentChangeManager: FragmentChangManager? = null
-
     var onTabSelectedListener: BottomNavigationBar.OnTabSelectedListener? = null
 
     /**
@@ -40,16 +41,39 @@ class BottomNavigation(context: Context?, attrs: AttributeSet?) : CoordinatorLay
         get() = bottom_navigation_bar.selectedPosition
         set(value) {
             bottom_navigation_bar.setCurrentTab(value)
-            fragmentChangeManager?.currentTab = value
+            bottom_navigation_view_pager.currentItem = value
         }
 
+    private lateinit var fragments: MutableList<Fragment>
+
     init {
         LayoutInflater.from(context).inflate(R.layout.bottom_navigation, this, true)
         layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
     }
 
-    fun setFragments(fragmentManager: FragmentManager, fragments: List<Fragment>) {
-        fragmentChangeManager = FragmentChangManager(fragmentManager, R.id.bottom_navigation_bar_content, fragments)
+    fun setFragments(fragmentManager: FragmentManager, fragmentList: ArrayList<Fragment>) {
+        this.fragments = fragmentList
+        bottom_navigation_view_pager.adapter = object : FragmentPagerAdapter(fragmentManager) {
+            override fun getItem(position: Int): Fragment {
+                return fragments[position]
+            }
+
+            override fun getCount(): Int {
+                return fragments.size
+            }
+
+        }
+    }
+
+    /**
+     * Set fragment at position
+     */
+    fun updateFragment(position: Int, fragment: Fragment) {
+        if (position < 0 || position >= fragments.size) {
+            throw IllegalArgumentException("position not exists")
+        }
+        fragments[position] = fragment
+        bottom_navigation_view_pager.adapter.notifyDataSetChanged()
     }
 
     fun setTabItems(tabs: List<BottomNavigationItem>) {
@@ -75,7 +99,7 @@ class BottomNavigation(context: Context?, attrs: AttributeSet?) : CoordinatorLay
             }
 
             override fun onTabReselected(position: Int) {
-                val fragment = fragmentChangeManager!!.fragments[position]
+                val fragment = fragments[position]
                 if (fragment is BottomNavigationBar.DoubleTapToScrollTop) {
                     fragment.scrollToTop()
                 }

bottom-navigation/src/main/java/com/chenshixin/bottomnavigation/BottomNavigationBehavior.kt

@@ -7,7 +7,7 @@ import android.view.View
 /**
  * Created by chenshixin on 7/5/16.
  */
-class BottomNavigationBehavior: CoordinatorLayout.Behavior<BottomNavigationBar>() {
+class BottomNavigationBehavior : CoordinatorLayout.Behavior<BottomNavigationBar>() {
 
     companion object {
         val SCROLL_DIRECTION_UP = 1
@@ -18,7 +18,7 @@ class BottomNavigationBehavior: CoordinatorLayout.Behavior<BottomNavigationBar>(
     private var totalDyConsumed = -1
 
     override fun layoutDependsOn(parent: CoordinatorLayout?, child: BottomNavigationBar, dependency: View?): Boolean {
-        return dependency?.id == R.id.bottom_navigation_bar_content
+        return dependency?.id == R.id.bottom_navigation_view_pager
     }
 
     override fun onStartNestedScroll(coordinatorLayout: CoordinatorLayout?, child: BottomNavigationBar, directTargetChild: View?, target: View?, nestedScrollAxes: Int): Boolean {

bottom-navigation/src/main/java/com/chenshixin/bottomnavigation/NoScrollViewPager.kt

@@ -0,0 +1,21 @@
+package com.chenshixin.bottomnavigation
+
+import android.content.Context
+import android.support.v4.view.ViewPager
+import android.util.AttributeSet
+import android.view.MotionEvent
+
+/**
+ * ViewPager without scroll between tabs
+ * Created by chenshixin on 7/18/16.
+ */
+class NoScrollViewPager(context: Context, attributeSet: AttributeSet) : ViewPager(context, attributeSet) {
+
+    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
+        return false
+    }
+
+    override fun onTouchEvent(ev: MotionEvent?): Boolean {
+        return false
+    }
+}

bottom-navigation/src/main/res/layout/bottom_navigation.xml

@@ -3,12 +3,12 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <FrameLayout
-        android:id="@+id/bottom_navigation_bar_content"
+    <com.chenshixin.bottomnavigation.NoScrollViewPager
+        android:id="@+id/bottom_navigation_view_pager"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
-    </FrameLayout>
+    </com.chenshixin.bottomnavigation.NoScrollViewPager>
 
     <com.chenshixin.bottomnavigation.BottomNavigationBar
         android:id="@+id/bottom_navigation_bar"