-A

.gitignore

@@ -0,0 +1,9 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.2.2'
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

dragrecyclerview/.gitignore

@@ -0,0 +1 @@
+/build

dragrecyclerview/build.gradle

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+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 24
+    buildToolsVersion "24.0.3"
+
+    defaultConfig {
+        minSdkVersion 15
+        targetSdkVersion 24
+        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-v7:24.2.1'
+    testCompile 'junit:junit:4.12'
+    compile 'com.android.support:recyclerview-v7:25.0.1'
+}

dragrecyclerview/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in D:\android\sdk24/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 *;
+#}

dragrecyclerview/src/androidTest/java/cn/cyan/dragrecyclerview/ExampleInstrumentedTest.java

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+package cn.cyan.dragrecyclerview;
+
+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("cn.cyan.dragrecyclerview.test", appContext.getPackageName());
+    }
+}

dragrecyclerview/src/main/AndroidManifest.xml

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

dragrecyclerview/src/main/java/cn/cyan/dragrecyclerview/DragRecyclerView.java

@@ -0,0 +1,214 @@
+package cn.cyan.dragrecyclerview;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.support.annotation.Nullable;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.animation.Animation;
+import android.view.animation.ScaleAnimation;
+
+/**
+ * Desc : 可拖动recyclerView
+ * User : Cyan([email protected])
+ * New  : 2016/9/21 14:27
+ */
+public class DragRecyclerView extends RecyclerView {
+
+    /* 适配器 */
+    private OnItemChangeListener adapter;
+    /* 是否可拖动 */
+    private boolean dragEnable;
+    /* 是否显示拖动动画 */
+    private boolean showDragAnimation;
+
+
+    public DragRecyclerView(Context context) {
+        super(context);
+        init(context, null);
+    }
+
+    public DragRecyclerView(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs);
+    }
+
+    private void init(Context context, AttributeSet attrs) {
+        if (attrs != null) {
+            TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.DragRecyclerView);
+            dragEnable = ta.getBoolean(R.styleable.DragRecyclerView_drag_enable, true);
+            showDragAnimation = ta.getBoolean(R.styleable.DragRecyclerView_show_drag_animation, true);
+            ta.recycle();
+        } else {
+            dragEnable = true;
+            showDragAnimation = true;
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // 拖动监听
+    ///////////////////////////////////////////////////////////////////////////
+    ItemTouchHelper touchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
+        @Override
+        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
+            // 监听方向
+            if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
+                final int dragFlag = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
+                return makeMovementFlags(dragFlag, 0);
+            } else {
+                final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
+                final int swipeFlags = 0;
+                return makeMovementFlags(dragFlags, swipeFlags);
+            }
+        }
+
+        @Override
+        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
+            // 原位置
+            int oldPosition = viewHolder.getAdapterPosition();
+            // 目标位置
+            int targetPosition = target.getAdapterPosition();
+            adapter.onItemMoved(oldPosition, targetPosition);
+            return false;
+        }
+
+        @Override
+        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
+            // 侧滑
+        }
+
+        @Override
+        public boolean isItemViewSwipeEnabled() {
+            return true;
+        }
+
+        @Override
+        public boolean isLongPressDragEnabled() {
+            // 禁用,使用自定义触摸监听
+            return false;
+        }
+
+        @Override
+        public void onChildDraw(Canvas c, RecyclerView recyclerView, ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
+            if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
+                //滑动时改变Item的透明度
+                final float alpha = 1 - Math.abs(dX) / (float) viewHolder.itemView.getWidth();
+                viewHolder.itemView.setAlpha(alpha);
+                viewHolder.itemView.setTranslationX(dX);
+            } else {
+                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
+            }
+        }
+
+        @Override
+        public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
+            if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
+                /** item已经被拽起(托起状态) */
+                // 设置背景
+                viewHolder.itemView.setBackgroundColor(Color.LTGRAY);
+                // 放大动画
+                if (showDragAnimation) zoomView(viewHolder.itemView);
+            }
+            super.onSelectedChanged(viewHolder, actionState);
+        }
+
+        @Override
+        public void clearView(RecyclerView recyclerView, ViewHolder viewHolder) {
+            super.clearView(recyclerView, viewHolder);
+            // 还原item的样式
+            viewHolder.itemView.setAlpha(1.0f);
+            viewHolder.itemView.setBackgroundColor(Color.WHITE);
+            // 缩放动画
+            if (showDragAnimation) revertView(viewHolder.itemView);
+        }
+
+        @Override
+        public boolean canDropOver(RecyclerView recyclerView, ViewHolder current, ViewHolder target) {
+            /** 被禁用的位置不会被挤兑 */
+            return adapter.onItemDrag(target.getAdapterPosition());
+        }
+    });
+
+    /* 放大动画 */
+    private ScaleAnimation zoomAnimation = new ScaleAnimation(1.0f, 1.1f, 1.0f, 1.1f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
+    /* 还原动画 */
+    private ScaleAnimation revertAnimation = new ScaleAnimation(1.1f, 1.0f, 1.1f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
+
+    /**
+     * 放大
+     *
+     * @param v 视图
+     */
+    private void zoomView(final View v) {
+        v.setAnimation(zoomAnimation);
+        // 动画执行完停留位置
+        zoomAnimation.setFillAfter(true);
+        // 动画持续时间
+        zoomAnimation.setDuration(200);
+        // 开始
+        zoomAnimation.start();
+    }
+
+    /**
+     * 还原
+     *
+     * @param v 视图
+     */
+    private void revertView(final View v) {
+        v.setAnimation(revertAnimation);
+        // 动画执行完停留位置
+        revertAnimation.setFillAfter(true);
+        // 动画持续时间
+        revertAnimation.setDuration(400);
+        // 执行监听
+        revertAnimation.setAnimationListener(new Animation.AnimationListener() {
+            @Override
+            public void onAnimationStart(Animation animation) {
+            }
+
+            @Override
+            public void onAnimationEnd(Animation animation) {
+                /** 动画结束后清除效果 */
+                v.clearAnimation();
+            }
+
+            @Override
+            public void onAnimationRepeat(Animation animation) {
+            }
+        });
+        // 开始
+        revertAnimation.start();
+    }
+
+    public DragRecyclerView setDragEnable(boolean dragEnable) {
+        this.dragEnable = dragEnable;
+        return this;
+    }
+
+    public DragRecyclerView setShowDragAnimation(boolean showDragAnimation) {
+        this.showDragAnimation = showDragAnimation;
+        return this;
+    }
+
+    public void setDragAdapter(OnItemChangeListener dragBaseAdapter) {
+        if (dragBaseAdapter instanceof Adapter) {
+            this.adapter = dragBaseAdapter;
+            if (dragEnable) {
+                touchHelper.attachToRecyclerView(this);
+            }
+            setAdapter((Adapter) adapter);
+        } else {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    public void startDrag(ViewHolder viewHolder) {
+        touchHelper.startDrag(viewHolder);
+    }
+
+}

dragrecyclerview/src/main/java/cn/cyan/dragrecyclerview/OnItemChangeListener.java

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+package cn.cyan.dragrecyclerview;
+
+/**
+ * Desc : item改变
+ * User : Cyan([email protected])
+ * New  : 2016/9/28 8:41
+ */
+public interface OnItemChangeListener {
+
+    /* 是否可拖动 */
+    boolean onItemDrag(int position);
+
+    /* item移动 */
+    void onItemMoved(int form, int target);
+}

dragrecyclerview/src/main/res/values/attrs.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="DragRecyclerView">
+        <attr name="show_decoration" format="boolean"/>
+        <attr name="drag_enable" format="boolean"/>
+        <attr name="show_drag_animation" format="boolean"/>
+    </declare-styleable>
+</resources>

dragrecyclerview/src/main/res/values/strings.xml

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

dragrecyclerview/src/test/java/cn/cyan/dragrecyclerview/ExampleUnitTest.java

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+package cn.cyan.dragrecyclerview;
+
+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);
+    }
+}