inti

.gitignore

+/build
+*.iml
+/src/main/gen

README.md

+
+# RefrashLayout  
+---  
+##example  
+   **xml**  
+   
+      <com.x.leo.refrashviews.RefreshLayout
+        android:layout_width="match_parent"
+        android:background="@color/colorPrimary"
+        android:id = "@+id/rf_myloan"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        app:mainView="@+id/rv_loan"
+        app:topView="@+id/top_view"
+        android:layout_height="match_parent">  
+          <TextView
+              android:layout_width="match_parent"
+              android:id = "@+id/top_view"
+              style="@style/text_14dp_white"
+              android:text="@string/textview_refrash"
+              android:gravity="center"
+              android:layout_height="@dimen/dp120" />
+          <android.support.v7.widget.RecyclerView
+              android:id="@+id/rv"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:layout_gravity="center_horizontal"
+              android:paddingTop="@dimen/dp20"
+              ></android.support.v7.widget.RecyclerView>
+       </com.x.leo.refrashviews.RefreshLayout>
+       
+   **java**  
+     
+         refrashLayout.setOnRefrashListener(new OnRefrashAdapter() {
+                @Override
+                public void onTopRefrash() {
+                    mPresenter.initLoanData();
+                }
+
+                @Override
+                public void onBottomRefrash() {
+
+                }
+            });

build.gradle

+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+android {
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
+
+    defaultConfig {
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(include: ['*.jar'], dir: 'libs')
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile "com.android.support:appcompat-v7:$rootProject.ext.supportLibraryVersion"
+    testCompile 'junit:junit:4.12'
+    compile "org.jetbrains.kotlin:kotlin-stdlib:$rootProject.ext.kotlin_version"
+    compile "com.android.support:design:$rootProject.ext.supportLibraryVersion"
+}
+repositories {
+    mavenCentral()
+}

proguard-rules.pro

+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in D:\Android\sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

src/androidTest/java/com/x/leo/refrashviews/ExampleInstrumentedTest.java

+package com.x.leo.refrashviews;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.x.leo.refrashviews.test", appContext.getPackageName());
+    }
+}

src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+
+    package="com.x.leo.refrashviews">
+
+    <application android:allowBackup="true" android:label="@string/app_name"
+        android:supportsRtl="true">
+
+    </application>
+
+</manifest>

src/main/java/com/x/leo/refrashviews/RefreshLayout.kt

+package com.x.leo.refrashviews
+
+import android.content.Context
+import android.graphics.Rect
+import android.support.v4.widget.ViewDragHelper
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import android.support.v7.widget.StaggeredGridLayoutManager
+import android.util.AttributeSet
+import android.util.Log
+import android.view.MotionEvent
+import android.view.View
+import android.view.ViewGroup
+import android.widget.AdapterView
+import android.widget.ListView
+import java.io.Serializable
+
+/**
+ * @作者:XLEO
+ * @创建日期: 2017/8/25 10:51
+ * @描述:${TODO}
+ *
+ * @更新者:${Author}$
+ * @更新时间:${Date}$
+ * @更新描述:${TODO}
+ * @下一步：
+ */
+
+class RefreshLayout(ctx: Context, attr: AttributeSet?) : ViewGroup(ctx, attr) {
+    constructor(ctx: Context) : this(ctx, null)
+
+    private var topRefrashViewId: Int = -1
+    private var bottomRefrashViewId: Int = -1
+    private var mainViewId: Int = -1
+    private var topRefrashView: View? = null
+
+    private var bottomView: View? = null
+
+    private var mainView: View? = null
+
+    private var isTopRefrash: Boolean = false
+    private var isBottomRefrash: Boolean = false
+    var onRefrashListener: OnRefrashListener? = null
+
+    companion object {
+        const val STATEDIRECTION = 0x0012.shl(3)
+        const val STATEIDLE = 0x0011.shl(3)
+        const val STATEDRAGING = 0x0013.shl(3)
+        const val STATENOTDRAG = 0x0014.shl(3)
+
+        const val DIR_NONE: Int = 0x1122
+        const val DIR_DOWN: Int = 0x1123
+        const val DIR_UP: Int = 0x1124
+        const val DO_LOG = false
+    }
+
+    private var currentState = STATEIDLE
+
+
+    private var direction: Int = DIR_NONE
+
+    private var offset: Int = 0
+
+    private var doReDispatchEvent: Boolean = false
+    private val dragHelper: ViewDragHelper by lazy {
+        ViewDragHelper.create(this, 1.0f, object : ViewDragHelper.Callback() {
+            override fun tryCaptureView(child: View, pointerId: Int): Boolean {
+                if (child!! == mainView) {
+                    return true
+                }
+                return false
+            }
+
+            override fun clampViewPositionVertical(child: View, top: Int, dy: Int): Int {
+                var realTop = top
+
+                if (doSetOffset) {
+                    val newTop = top - offset
+                    doSetOffset = false
+                    realTop = newTop
+                    logd("==top:" + realTop + ";dy:" + dy + ";threadId:" + Thread.currentThread().id + ";isTopRefrash:" + isTopRefrash + ";currentState:" + currentState + ";time:" + System.currentTimeMillis())
+                }
+                logd("top:" + realTop + ";dy:" + dy + ";isTopRefrash:" + isTopRefrash + ";currentState:" + currentState + ";time:" + System.currentTimeMillis())
+                if (isTopRefrash && realTop < 0) {
+                    realTop = 0
+                    doReDispatchEvent = true
+
+                } else if (isBottomRefrash && realTop > 0) {
+                    realTop = 0
+                    doReDispatchEvent = true
+                } else {
+                    if (!(isTopRefrashable() && realTop >= 0) && !(isBottomRefrashable() && realTop <= 0)) {
+                        realTop = 0
+                        doReDispatchEvent = true
+                    }
+                }
+                return realTop
+            }
+
+            override fun clampViewPositionHorizontal(child: View, left: Int, dx: Int): Int {
+                return child!!.left
+            }
+
+            override fun onViewReleased(releasedChild: View, xvel: Float, yvel: Float) {
+                resetViews()
+            }
+
+            override fun onViewPositionChanged(changedView: View, left: Int, top: Int, dx: Int, dy: Int) {
+                // logd("newtop:" + top + ";dy:" + dy)
+                locateViews(top)
+                if (doReDispatchEvent) {
+                    //redispatchEvent()
+                    doReDispatchEvent = false
+                }
+            }
+        })
+
+    }
+
+    private fun redispatchEvent() {
+        getDirection()
+        isDirectionPermited()
+        when (currentState) {
+            STATEDRAGING -> {
+                if (dragHelper.activePointerId == localEvent!!.getPointerId(localEvent!!.actionIndex))
+                    dragHelper.processTouchEvent(localEvent!!)
+            }
+            STATENOTDRAG -> {
+                mainView!!.dispatchTouchEvent(localEvent)
+            }
+            else -> {
+            }
+        }
+    }
+
+    private fun locateViews(dy: Int) {
+        when (dy > 0) {
+            true -> {
+                if (isBottomRefrash) {
+                    bottomMoveBy(dy)
+                } else {
+                    if (topRefrashView != null) {
+                        topMoveBy(dy)
+                        isTopRefrash = true
+                    }
+                }
+            }
+            else -> {
+                if (isTopRefrash) {
+                    topMoveBy(dy)
+                } else {
+                    if (bottomView != null) {
+                        bottomMoveBy(dy)
+                        isBottomRefrash = true
+                    }
+                }
+            }
+        }
+    }
+
+    private var isReleaseing: Boolean = false
+
+    override fun computeScroll() {
+        if (dragHelper.continueSettling(true)) {
+            invalidate()
+        } else {
+            if (isReleaseing) {
+                isBottomRefrash = false
+                isTopRefrash = false
+                isReleaseing = false
+            }
+        }
+    }
+
+    private fun resetViews() {
+        logd("reset")
+        isReleaseing = true
+        if (mainView != null) {
+            dragHelper.settleCapturedViewAt(paddingLeft, paddingTop)
+        }
+        invalidate()
+        if (isTopRefrash) {
+            if (topRefrashView!!.translationY > topViewHeight * 1 / 2)
+                onRefrashListener?.onTopRefrash()
+        }
+        if (isBottomRefrash) {
+            if ((-bottomView!!.translationY) > bottomViewHeight * 1 / 2)
+                onRefrashListener?.onBottomRefrash()
+        }
+    }
+
+    private fun topMoveBy(dy: Int) {
+        if (dy <= 0) {
+            topRefrashView!!.translationY = 0f
+            //logd("topview:transY:" + topRefrashView!!.translationY)
+            onRefrashListener?.onTopViewMove(0)
+            isTopRefrash = false
+            locateViews(dy)
+        } else {
+            topRefrashView!!.translationY = dy.toFloat()
+            //logd("topview:transY:" + topRefrashView!!.translationY)
+            onRefrashListener?.onTopViewMove(dy)
+        }
+    }
+
+    private fun bottomMoveBy(dy: Int) {
+        if (dy >= 0) {
+            bottomView!!.translationY = 0f
+            onRefrashListener?.onBottomViewMove(0)
+            isBottomRefrash = false
+            locateViews(dy)
+        } else {
+            bottomView!!.translationY = dy.toFloat()
+            onRefrashListener?.onBottomViewMove(dy)
+        }
+    }
+
+
+    init {
+        if (attr != null) {
+            val attrs = ctx.obtainStyledAttributes(attr!!, R.styleable.RefreshLayout)
+            topRefrashViewId = attrs.getResourceId(R.styleable.RefreshLayout_topView, -1)
+            bottomRefrashViewId = attrs.getResourceId(R.styleable.RefreshLayout_bottomView, -1)
+            mainViewId = attrs.getResourceId(R.styleable.RefreshLayout_mainView, -1)
+        }
+    }
+
+
+    fun logd(s: String) {
+        if (DO_LOG) {
+            Log.d("RefreshLayout", s)
+        }
+    }
+
+    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
+        if (ev != null) {
+            dragHelper.shouldInterceptTouchEvent(ev)
+        }
+        return true
+    }
+
+
+    private fun isDirectionPermited(): Boolean {
+        when (mainView) {
+            is AdapterView<*> -> {
+                val listView = mainView as ListView
+                if (listView.adapter == null || listView.adapter.count <= 0) {
+                    currentState = STATEDRAGING
+                    return true
+                }
+                if (listView.firstVisiblePosition == 0 && isChildTopVisible(listView.getChildAt(0)) && isTopRefrashable()) {
+                    currentState = STATEDRAGING
+                    return true
+
+                }
+                if (listView.lastVisiblePosition == listView.adapter.count - 1 && isChildBottomVisible(listView.getChildAt(listView.childCount - 1)) && isBottomRefrashable()) {
+                    currentState = STATEDRAGING
+                    return true
+                }
+            }
+            is RecyclerView -> {
+                val recycler = mainView as RecyclerView
+
+                if (recycler.layoutManager is LinearLayoutManager) {
+                    if (recycler.adapter == null && direction != DIR_NONE) {
+                        currentState = STATEDRAGING
+                        return true
+                    }
+                    val linearManager = recycler.layoutManager as LinearLayoutManager
+                    //获取第一个可见view的位置
+                    val firstItemPosition = linearManager.findFirstCompletelyVisibleItemPosition()
+                    if (firstItemPosition <= 0 && isTopRefrashable()) {
+                        changeToDragState()
+                        return true
+                    }
+                    //获取最后一个可见view的位置
+                    val lastItemPosition = linearManager.findLastCompletelyVisibleItemPosition()
+                    if ((recycler.adapter == null || recycler.adapter.itemCount == 0 || lastItemPosition == recycler.adapter.itemCount - 1) && isBottomRefrashable()) {
+                        changeToDragState()
+                        return true
+                    }
+
+                } else if (recycler.layoutManager is StaggeredGridLayoutManager) {
+                    val stagger = recycler.layoutManager as StaggeredGridLayoutManager
+                    if (stagger.findViewByPosition(0).windowVisibility != View.GONE && isTopRefrashable()) {
+                        changeToDragState()
+                        return true
+                    } else if ((recycler.adapter == null || recycler.adapter.itemCount == 0 || stagger.findViewByPosition(recycler.adapter.itemCount - 1).windowVisibility != View.GONE) && isBottomRefrashable()) {
+                        changeToDragState()
+                        return true
+                    }
+                }
+            }
+            is ViewGroup -> {
+                val view = mainView as ViewGroup
+                if (view.childCount <= 0) {
+                    if (direction != DIR_NONE) {
+                        changeToDragState()
+                        return true
+                    } else {
+                        changeToNotDragState()
+                        return false
+                    }
+                }
+                if (view.getChildAt(0).windowVisibility != View.GONE && isTopRefrashable()) {
+                    changeToDragState()
+                    return true
+                } else if (view.getChildAt(view.childCount - 1).windowVisibility != View.GONE && isBottomRefrashable()) {
+                    changeToDragState()
+                    return true
+                }
+            }
+            else -> {
+                changeToDragState()
+                return true
+            }
+        }
+        changeToNotDragState()
+        return false
+    }
+
+
+    private fun isChildTopVisible(childAt: View?): Boolean {
+        if (childAt == null) {
+            return false
+        }
+        return try {
+            val mainRect = Rect()
+            mainView!!.getGlobalVisibleRect(mainRect)
+            val rect = Rect()
+            childAt.getGlobalVisibleRect(rect)
+            Log.d("Visible", "main:" + mainRect.toString() + ";current:" + rect.toString())
+            (rect.top >= mainRect.top && rect.height() >= childAt.height - 1) || mainRect.height() < mainView!!.height
+        } catch (e: Throwable) {
+            true
+        }
+    }
+
+    private fun isChildBottomVisible(childAt: View?): Boolean {
+        if (childAt == null) {
+            return false
+        }
+        return try {
+            val mainRect = Rect()
+            mainView!!.getGlobalVisibleRect(mainRect)
+            val rect = Rect()
+            childAt.getGlobalVisibleRect(rect)
+            (rect.bottom <= mainRect.bottom && rect.height() >= childAt.height - 1) || mainRect.height() < mainView!!.height
+        } catch (e: Throwable) {
+            true
+        }
+    }
+
+    private fun changeToNotDragState() {
+        currentState = STATENOTDRAG
+    }
+
+    private fun isBottomRefrashable(): Boolean {
+        return if (bottomView == null) {
+            false
+        } else bottomView!!.translationY < 0 || direction == DIR_UP
+    }
+
+    private fun isTopRefrashable(): Boolean {
+        return if (topRefrashView == null) {
+            false
+        } else direction == DIR_DOWN || (topRefrashView != null && topRefrashView!!.translationY > 0)
+    }
+
+    private val eventLog: EventLogHolder by lazy {
+        EventLogHolder()
+    }
+
+    class EventLogHolder {
+        var start: MotionEventBean? = null
+        var last: MotionEventBean? = null
+        var current: MotionEventBean? = null
+        fun initStart(event: MotionEvent) {
+            start = MotionEventBean(event.actionMasked, event.x, event.y)
+            addEvent(event)
+        }
+
+        fun addEvent(event: MotionEvent) {
+            if (current != null) {
+                moveCurrentToLast()
+                current!!.updateDatas(event)
+            } else {
+                current = MotionEventBean(event.actionMasked, event.x, event.y)
+            }
+        }
+
+        private fun moveCurrentToLast() {
+            if (last == null) {
+                last = MotionEventBean(current!!.type, current!!.x, current!!.y)
+            } else {
+                last!!.updateDatas(current!!)
+            }
+        }
+
+        fun clearHolder() {
+            start = null
+            last = null
+            current = null
+        }
+    }
+
+    private var localEvent: MotionEvent? = null
+    override fun onTouchEvent(event: MotionEvent?): Boolean {
+        when (event?.actionMasked) {
+            MotionEvent.ACTION_DOWN -> {
+                eventLog.initStart(event)
+                if (isReleaseing) {
+                    changeToDragState()
+                    dragHelper.processTouchEvent(event)
+                } else {
+                    isReleaseing = false
+                    mainView!!.dispatchTouchEvent(event)
+                    dragHelper.processTouchEvent(event)
+                    currentState = STATEDIRECTION
+                    logd("down" + ";threadId:" + Thread.currentThread().id)
+                }
+            }
+            MotionEvent.ACTION_MOVE -> {
+                if (event.actionIndex == 0) {
+                    eventLog.addEvent(event)
+                    localEvent = event
+                    redispatchEvent()
+                    isReleaseing = false
+//                logd("move")
+                }
+            }
+            MotionEvent.ACTION_UP -> {
+                if (currentState == STATEDRAGING) {
+                    dragHelper.processTouchEvent(event)
+                } else if (currentState == STATENOTDRAG) {
+                    mainView!!.dispatchTouchEvent(event)
+                } else {
+                    mainView!!.dispatchTouchEvent(event)
+                }
+                currentState = STATEIDLE
+                direction = DIR_NONE
+                doSetOffset = false
+                eventLog.clearHolder()
+                logd("up" + ";threadId:" + Thread.currentThread().id)
+            }
+            else -> {
+                logd("else_state" + event!!.action)
+            }
+        }
+        return true
+    }
+
+    private fun changeToDragState() {
+        if (currentState == STATENOTDRAG) {
+            calcuteOffset()
+        }
+        currentState = STATEDRAGING
+    }
+
+    private var doSetOffset: Boolean = false
+
+    fun calcuteOffset() {
+
+        offset = ((eventLog.last!!.y - eventLog.start!!.y) + 0.5f).toInt()
+        if (direction == DIR_DOWN && offset > 0) {
+            doSetOffset = true
+            logd("offset:" + offset + ";threadId:" + Thread.currentThread().id + ":startY:" + eventLog.start!!.y + ";currY:" + eventLog.last!!.y + ";dir:" + direction + ";time:" + System.currentTimeMillis())
+        } else if (direction == DIR_UP && offset < 0) {
+            doSetOffset = true
+            logd("offset:" + offset + ";threadId:" + Thread.currentThread().id + ":startY:" + eventLog.start!!.y + ";currY:" + eventLog.last!!.y + ";dir:" + direction + ";time:" + System.currentTimeMillis())
+        } else {
+            doSetOffset = false
+        }
+    }
+
+    private var isDirectionChanged: Boolean = false
+
+    private fun getDirection() {
+        if (eventLog.last != null) {
+            var newDirection = DIR_NONE
+            val abs = Math.abs(eventLog.current!!.y - eventLog.last!!.y)
+            if (abs == 0.0f) {
+                newDirection = DIR_NONE
+            } else {
+                val fl = Math.abs(eventLog.current!!.x - eventLog.last!!.x) / abs
+
+                if (fl <= 0.5f) {
+                    if (eventLog.last!!.y > eventLog.current!!.y) {
+                        newDirection = DIR_UP
+                    } else {
+                        newDirection = DIR_DOWN
+                    }
+                } else {
+                    newDirection = DIR_NONE
+                }
+            }
+            if (direction != newDirection) {
+                isDirectionChanged = true
+                direction = newDirection
+            } else {
+                isDirectionChanged = false
+            }
+        }
+    }
+
+    private var topViewHeight: Int = 0
+
+    private var bottomViewHeight: Int = 0
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        measureChildren(widthMeasureSpec, heightMeasureSpec)
+        if (topRefrashView != null) {
+            topViewHeight = topRefrashView!!.measuredHeight
+        }
+        if (bottomView != null) {
+            bottomViewHeight = bottomView!!.measuredHeight
+        }
+        setMeasuredDimension(widthMeasureSpec, heightMeasureSpec)
+    }
+
+    override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
+        if (topRefrashView != null) {
+            topRefrashView!!.layout(0, -topViewHeight, measuredWidth, 0)
+        }
+        if (mainView != null) {
+            mainView!!.layout(paddingLeft, paddingTop, measuredWidth - paddingRight, measuredHeight - paddingBottom)
+        }
+        if (bottomView != null) {
+            bottomView!!.layout(0, measuredHeight, measuredWidth, measuredHeight + bottomViewHeight)
+        }
+    }
+
+    override fun onFinishInflate() {
+        if (childCount > 0) {
+            for (i in 0..childCount - 1) {
+                when (getChildAt(i).id) {
+                    -1 -> {
+                        throw IllegalArgumentException("child with NOID is not supported")
+                    }
+                    topRefrashViewId -> {
+                        topRefrashView = getChildAt(i)
+                    }
+                    bottomRefrashViewId -> {
+                        bottomView = getChildAt(i)
+                    }
+                    mainViewId -> {
+                        mainView = getChildAt(i)
+                    }
+                    else -> {
+                    }
+                }
+            }
+        }
+        super.onFinishInflate()
+
+    }
+}
+
+interface OnRefrashListener {
+    fun onTopRefrash()
+    fun onBottomRefrash()
+    fun onTopViewMove(transY: Int)
+    fun onBottomViewMove(transY: Int)
+}
+
+abstract class OnRefrashAdapter : OnRefrashListener {
+    override fun onBottomViewMove(transY: Int) {
+    }
+
+    override fun onTopViewMove(transY: Int) {
+    }
+}
+
+data class MotionEventBean(var type: Int, var x: Float, var y: Float) : Serializable {
+    fun updateDatas(event: MotionEvent) {
+        type = event.actionMasked
+        x = event.x
+        y = event.y
+    }
+
+    fun updateDatas(event: MotionEventBean) {
+        type = event.type
+        x = event.x
+        y = event.y
+    }
+}
\ No newline at end of file

src/main/java/com/x/leo/refrashviews/VDHLayout.java

+package com.x.leo.refrashviews;
+
+import android.content.Context;
+import android.graphics.Point;
+import android.support.v4.widget.ViewDragHelper;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.LinearLayout;
+
+/**
+ * @作者:XLEO
+ * @创建日期: 2017/8/25 15:32
+ * @描述:${TODO}
+ * @更新者:${Author}$
+ * @更新时间:${Date}$
+ * @更新描述:${TODO}
+ * @下一步：
+ */
+
+public class VDHLayout extends LinearLayout
+{
+    private ViewDragHelper mDragger;
+
+    private View mDragView;
+    private View mAutoBackView;
+    private View mEdgeTrackerView;
+
+    private Point mAutoBackOriginPos = new Point();
+
+    public VDHLayout(Context context, AttributeSet attrs)
+    {
+        super(context, attrs);
+        mDragger = ViewDragHelper.create(this, 1.0f, new ViewDragHelper.Callback()
+        {
+            @Override
+            public boolean tryCaptureView(View child, int pointerId)
+            {
+                //mEdgeTrackerView禁止直接移动
+                return child == mDragView || child == mAutoBackView;
+            }
+
+            @Override
+            public int clampViewPositionHorizontal(View child, int left, int dx)
+            {
+                return left;
+            }
+
+            @Override
+            public int clampViewPositionVertical(View child, int top, int dy)
+            {
+                return top;
+            }
+
+
+            //手指释放的时候回调
+            @Override
+            public void onViewReleased(View releasedChild, float xvel, float yvel)
+            {
+                //mAutoBackView手指释放时可以自动回去
+                if (releasedChild == mAutoBackView)
+                {
+                    mDragger.settleCapturedViewAt(mAutoBackOriginPos.x, mAutoBackOriginPos.y);
+                    invalidate();
+                }
+            }
+
+            //在边界拖动时回调
+            @Override
+            public void onEdgeDragStarted(int edgeFlags, int pointerId)
+            {
+                mDragger.captureChildView(mEdgeTrackerView, pointerId);
+            }
+        });
+        mDragger.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT);
+    }
+
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent event)
+    {
+        return mDragger.shouldInterceptTouchEvent(event);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event)
+    {
+        mDragger.processTouchEvent(event);
+        return true;
+    }
+
+    @Override
+    public void computeScroll()
+    {
+        if(mDragger.continueSettling(true))
+        {
+            invalidate();
+        }
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b)
+    {
+        super.onLayout(changed, l, t, r, b);
+
+        mAutoBackOriginPos.x = mAutoBackView.getLeft();
+        mAutoBackOriginPos.y = mAutoBackView.getTop();
+    }
+
+    @Override
+    protected void onFinishInflate()
+    {
+        super.onFinishInflate();
+
+        mDragView = getChildAt(0);
+        mAutoBackView = getChildAt(1);
+        mEdgeTrackerView = getChildAt(2);
+    }
+}

src/main/res/values/attr.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="RefreshLayout">
+        <attr name="topView" format="reference"/>
+        <attr name="mainView" format="reference"/>
+        <attr name="bottomView" format="reference"/>
+    </declare-styleable>
+</resources>

src/main/res/values/strings.xml

+<resources>
+    <string name="app_name">RefrashViews</string>
+</resources>

src/test/java/com/x/leo/refrashviews/ExampleUnitTest.java

+package com.x.leo.refrashviews;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}
\ No newline at end of file