初始化1v1语聊项目

ViewPager2Delegate/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.angcyo.tablayout.delegate2" />

ViewPager2Delegate/src/main/java/com/angcyo/tablayout/delegate2/ViewPager2Delegate.kt

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+package com.angcyo.tablayout.delegate2
+
+import androidx.viewpager2.widget.ViewPager2
+import com.angcyo.tablayout.DslTabLayout
+import com.angcyo.tablayout.ViewPagerDelegate
+import kotlin.math.absoluteValue
+
+/**
+ * 兼容[ViewPager2]
+ * Email:angcyo@126.com
+ * @author angcyo
+ * @date 2019/12/14
+ */
+open class ViewPager2Delegate(
+    val viewPager: ViewPager2,
+    val dslTabLayout: DslTabLayout?,
+    val forceSmoothScroll: Boolean? = null
+) : ViewPager2.OnPageChangeCallback(), ViewPagerDelegate {
+
+    companion object {
+
+        /**
+         * [forceSmoothScroll] 为 null, 只有切换左右page时, 才有VP的动画, 否则没有.
+         * */
+        fun install(
+            viewPager: ViewPager2,
+            dslTabLayout: DslTabLayout?,
+            forceSmoothScroll: Boolean? = null
+        ): ViewPager2Delegate {
+            return ViewPager2Delegate(viewPager, dslTabLayout, forceSmoothScroll)
+        }
+    }
+
+    init {
+        viewPager.registerOnPageChangeCallback(this)
+        dslTabLayout?.setupViewPager(this)
+    }
+
+    override fun onGetCurrentItem(): Int {
+        return viewPager.currentItem
+    }
+
+    override fun onSetCurrentItem(
+        fromIndex: Int,
+        toIndex: Int,
+        reselect: Boolean,
+        fromUser: Boolean
+    ) {
+        if (fromUser) {
+            val smoothScroll = forceSmoothScroll ?: ((toIndex - fromIndex).absoluteValue <= 1)
+            viewPager.setCurrentItem(toIndex, smoothScroll)
+        }
+    }
+
+    override fun onPageScrollStateChanged(state: Int) {
+        dslTabLayout?.onPageScrollStateChanged(state)
+    }
+
+    override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
+        dslTabLayout?.onPageScrolled(position, positionOffset, positionOffsetPixels)
+    }
+
+    override fun onPageSelected(position: Int) {
+        dslTabLayout?.onPageSelected(position)
+    }
+}