RecyclerView+FloatingActionButton应用

一.效果图

二.实现步骤

1.XML布局-添加依赖

     <LinearLayout

         android:id="@+id/layout"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:orientation="horizontal">

         <Button

             android:id="@+id/btn_linear"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:text="Linear"/>

         <Button

             android:id="@+id/btn_simple"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:text="Simple"/>

         <Button

             android:id="@+id/btn_add"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:text="add"

             />

     </LinearLayout>

     <android.support.design.widget.CoordinatorLayout

         android:layout_width="match_parent"

         android:layout_height="match_parent"

         android:layout_below="@+id/layout">

         <android.support.v7.widget.RecyclerView

             android:id="@+id/recycle_view"

             android:layout_width="match_parent"

             android:layout_height="wrap_content"

             >

         </android.support.v7.widget.RecyclerView>

         <android.support.design.widget.FloatingActionButton

             android:id="@+id/flaot_btn"

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:layout_gravity="right|bottom"

             >

         </android.support.design.widget.FloatingActionButton>

     </android.support.design.widget.CoordinatorLayout>

XML布局

 <?xml version="1.0" encoding="utf-8"?>

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="match_parent"

     android:layout_height="wrap_content"

     android:padding="5dp"

     >

     <TextView

         android:id="@+id/tv_cyc_item"

         style="@style/CycStyle"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:clickable="true"

         android:gravity="center"

         android:textColor="@android:color/white"/>

 </LinearLayout>

RecyclerView-Item布局

 <?xml version="1.0" encoding="utf-8"?>

 <selector xmlns:android="http://schemas.android.com/apk/res/android">

     <item android:drawable="@android:color/holo_red_dark" android:state_pressed="true"/>

     <item android:drawable="@android:color/holo_blue_dark"></item>

 </selector>

Item点击变色Style

 import android.content.Context;

 import android.support.v7.widget.RecyclerView;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.TextView;

 import java.util.ArrayList;

 public class AdapterRecyclerView extends RecyclerView.Adapter<AdapterRecyclerView.MyDivViewHolder>{

     ArrayList<String> arrayList;

     Context context;

     public AdapterRecyclerView(ArrayList<String> arrayList,Context con){

         this.arrayList=arrayList;

         this.context=con;

     }

     @Override

     public MyDivViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

         LayoutInflater layoutInflater=LayoutInflater.from(context);

         MyDivViewHolder myDivViewHolder=new MyDivViewHolder(layoutInflater.inflate(R.layout.recyclerview_item,parent,false));

         return myDivViewHolder;

     }

     @Override

     public void onBindViewHolder(MyDivViewHolder holder, int position) {

         MyDivViewHolder myDivViewHolder=holder;

         myDivViewHolder.tv.setText(arrayList.get(position));

     }

     @Override

     public int getItemCount() {

         return arrayList.size();

     }

     class MyDivViewHolder extends RecyclerView.ViewHolder{

         TextView tv;

         public MyDivViewHolder(View view){

             super(view);

             tv=(TextView)view.findViewById(R.id.tv_cyc_item);

         }

     }

 }

RecyclerView.Adapter实现

     void initEvent(){

         arrayList=new ArrayList<String>();

         for(int i='A';i<'Z';i++){

             arrayList.add(""+(char)i);

         }

         //adapter 绑定

         AdapterRecyclerView adapter=new AdapterRecyclerView(arrayList,getApplicationContext());

         cycView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

         cycView.setAdapter(adapter);

     }

Adapter绑定

2.瀑布流初步实现效果

3.Item高度随机设置

适配器中设置TextView显示高度

     public void onBindViewHolder(MyDivViewHolder holder, int position) {

         MyDivViewHolder myDivViewHolder=holder;

         ViewGroup.LayoutParams lp = myDivViewHolder.tv.getLayoutParams();

         lp.height =stragger_random_height==0? 80: 50+new Random().nextInt(stragger_random_height)*5;

         myDivViewHolder.tv.setLayoutParams(lp);

         myDivViewHolder.tv.setText(arrayList.get(position));

     }

 //添加 高度设置变量及函数

 int stragger_random_height=0;

 public void setStragger_random_height(int stragger_random_height) {

         this.stragger_random_height = stragger_random_height;

     }

TextView设置

 //adapter 绑定

         AdapterRecyclerView adapter=new AdapterRecyclerView(arrayList,getApplicationContext());

         adapter.setStragger_random_height(100);

         cycView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

         cycView.setAdapter(adapter);

绑定适配器时设置随机高度参数

运行效果图：

4.Item点击动画设置(点击选中是Y轴180度转动，拖动后X轴180度转动)及Item移动及滑动删除

ItemTouchHelper.Callback实现

 import android.animation.ObjectAnimator;

 import android.support.v7.widget.RecyclerView;

 import android.support.v7.widget.helper.ItemTouchHelper;

 import android.view.View;

 import android.view.animation.DecelerateInterpolator;

 import java.util.ArrayList;

 import java.util.Collections;

 public class MyItemTouchHelper extends ItemTouchHelper.Callback{

     RecyclerView.Adapter mAdapter;

     ArrayList<String> arrayList;

     RecyclerView.ViewHolder vh;

     public void setArrayList(ArrayList<String> arrayList) {

         this.arrayList = arrayList;

     }

     public void setmAdapter(RecyclerView.Adapter mAdapter) {

         this.mAdapter = mAdapter;

     }

     @Override

     public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

         arrayList.remove(viewHolder.getAdapterPosition());// 将数据集中的数据移除

         mAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());// 刷新列表

     }

     /*获取移动标志*/

     @Override

     public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {

         // 拖拽的标记，这里允许上下左右四个方向

         int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;

         int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;// 滑动的标记，这里允许左右滑动

         return makeMovementFlags(dragFlags, swipeFlags);

     }

     /*当一个Item被另外的Item替代时回调，也就是数据集的内容顺序改变*/

     @Override

     public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {

         Collections.swap(arrayList, viewHolder.getAdapterPosition(), target.getAdapterPosition());

         return true;

     }

     @Override

     public void onMoved(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, int fromPos, RecyclerView.ViewHolder target, int toPos, int x, int y) {

         super.onMoved(recyclerView, viewHolder, fromPos, target, toPos, x, y);

         mAdapter.notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition());

     }

     /*Item是否可以长按 */

     @Override

     public boolean isLongPressDragEnabled() {

         return true;

     }

     /* Item是否可以滑动*/

     @Override

     public boolean isItemViewSwipeEnabled() {

         return true;

     }

     /* 当某个Item被滑动离开屏幕之后回调*/

     @Override

     public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {

         super.onSelectedChanged(viewHolder, actionState);

         if (viewHolder != null) {

             vh = viewHolder;

             pickUpAnimation(viewHolder.itemView);

         } else {

             if (vh != null) {

                 putDownAnimation(vh.itemView);

             }

         }

     }

     /*放下动画*/

     private void putDownAnimation(View view){

         ObjectAnimator animator = ObjectAnimator.ofFloat(view,"rotationY",0,180,0);//Y轴变动

         animator.setInterpolator(new DecelerateInterpolator());

         animator.setDuration(500);

         animator.start();

     }

     /*托起动画*/

     private void pickUpAnimation(View view) {

         ObjectAnimator animator = ObjectAnimator.ofFloat(view,"rotationX",0,180,0);

         animator.setInterpolator(new DecelerateInterpolator());

         animator.setDuration(500);

         animator.start();

     }

 }

创建继承ItemTouchHelper类MyItemTouchHelper

ItemTouchHelper与RecyclerView绑定

 void initEvent(){

         arrayList=new ArrayList<String>();

         for(int i='A';i<'Z';i++){

             arrayList.add(""+(char)i);

         }

         //adapter 绑定

         AdapterRecyclerView adapter=new AdapterRecyclerView(arrayList,getApplicationContext());

         adapter.setStragger_random_height(100);

         cycView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

         cycView.setAdapter(adapter);

         //ItemTouchHelper绑定RecyclerView

         MyItemTouchHelper myItemTouchHelper=new MyItemTouchHelper();

         myItemTouchHelper.setArrayList(arrayList);

         myItemTouchHelper.setmAdapter(adapter);

         ItemTouchHelper itemTouchHelper=new ItemTouchHelper(myItemTouchHelper);

         itemTouchHelper.attachToRecyclerView(cycView);

     }

ItemTouchHelper绑定RecyclerView

运行效果图：

5.FloatingActionButton返回RecyclerView顶部

 cycView.smoothScrollToPosition(0);

RecyclerView返回顶部

运行效果图：

6.3个类的全部源码

 package rgsc.recyclerviewactivity;

 import android.support.design.widget.FloatingActionButton;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.support.v7.widget.RecyclerView;

 import android.support.v7.widget.StaggeredGridLayoutManager;

 import android.support.v7.widget.helper.ItemTouchHelper;

 import android.view.View;

 import android.widget.Button;

 import java.util.ArrayList;

 public class MainActivity extends AppCompatActivity implements View.OnClickListener{

     RecyclerView cycView;

     Button btn_linear;

     Button btn_add;

     Button btn_simple;

     FloatingActionButton fb;

     ArrayList<String> arrayList;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         initControl();

         initEvent();

     }

     void initControl(){

         fb=(FloatingActionButton)findViewById(R.id.flaot_btn);

         cycView=(RecyclerView)findViewById(R.id.recycle_view);

         btn_linear=(Button)findViewById(R.id.btn_linear);

         btn_simple=(Button)findViewById(R.id.btn_simple);

         btn_add=(Button)findViewById(R.id.btn_add);

         fb.setOnClickListener(this);

         btn_add.setOnClickListener(this);

         btn_simple.setOnClickListener(this);

         btn_linear.setOnClickListener(this);

     }

     void initEvent(){

         arrayList=new ArrayList<String>();

         for(int i='A';i<'Z';i++){

             arrayList.add(""+(char)i);

         }

         //adapter 绑定

         AdapterRecyclerView adapter=new AdapterRecyclerView(arrayList,getApplicationContext());

         adapter.setStragger_random_height(100);

         cycView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

         cycView.setAdapter(adapter);

         //ItemTouchHelper绑定RecyclerView

         MyItemTouchHelper myItemTouchHelper=new MyItemTouchHelper();

         myItemTouchHelper.setArrayList(arrayList);

         myItemTouchHelper.setmAdapter(adapter);

         ItemTouchHelper itemTouchHelper=new ItemTouchHelper(myItemTouchHelper);

         itemTouchHelper.attachToRecyclerView(cycView);

     }

     @Override

     public void onClick(View view) {

         switch (view.getId()){

             case R.id.btn_linear://LinearLayout 布局

                 break;

             case R.id.btn_simple:

                 break;

             case R.id.btn_add:

                 break;

             case R.id.flaot_btn:

                 cycView.smoothScrollToPosition(0);

                 break;

         }

     }

 }

MainActivity

 package rgsc.recyclerviewactivity;

 import android.content.Context;

 import android.support.v7.widget.RecyclerView;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.TextView;

 import java.util.ArrayList;

 import java.util.Random;

 public class AdapterRecyclerView extends RecyclerView.Adapter<AdapterRecyclerView.MyDivViewHolder>{

     ArrayList<String> arrayList;

     Context context;

     int stragger_random_height=0;

     public AdapterRecyclerView(ArrayList<String> arrayList,Context con){

         this.arrayList=arrayList;

         this.context=con;

     }

     @Override

     public MyDivViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

         LayoutInflater layoutInflater=LayoutInflater.from(context);

         MyDivViewHolder myDivViewHolder=new MyDivViewHolder(layoutInflater.inflate(R.layout.recyclerview_item,parent,false));

         return myDivViewHolder;

     }

     @Override

     public void onBindViewHolder(MyDivViewHolder holder, int position) {

         MyDivViewHolder myDivViewHolder=holder;

         ViewGroup.LayoutParams lp = myDivViewHolder.tv.getLayoutParams();

         lp.height =stragger_random_height==0? 80: 50+new Random().nextInt(stragger_random_height)*5;

         myDivViewHolder.tv.setLayoutParams(lp);

         myDivViewHolder.tv.setText(arrayList.get(position));

     }

     @Override

     public int getItemCount() {

         return arrayList.size();

     }

     public void setStragger_random_height(int stragger_random_height) {

         this.stragger_random_height = stragger_random_height;

     }

     class MyDivViewHolder extends RecyclerView.ViewHolder{

         TextView tv;

         public MyDivViewHolder(View view){

             super(view);

             tv=(TextView)view.findViewById(R.id.tv_cyc_item);

         }

     }

 }

AdapterRecyclerView

 package rgsc.recyclerviewactivity;

 import android.animation.ObjectAnimator;

 import android.support.v7.widget.RecyclerView;

 import android.support.v7.widget.helper.ItemTouchHelper;

 import android.view.View;

 import android.view.animation.DecelerateInterpolator;

 import java.util.ArrayList;

 import java.util.Collections;

 public class MyItemTouchHelper extends ItemTouchHelper.Callback{

     RecyclerView.Adapter mAdapter;

     ArrayList<String> arrayList;

     RecyclerView.ViewHolder vh;

     public void setArrayList(ArrayList<String> arrayList) {

         this.arrayList = arrayList;

     }

     public void setmAdapter(RecyclerView.Adapter mAdapter) {

         this.mAdapter = mAdapter;

     }

     @Override

     public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

         arrayList.remove(viewHolder.getAdapterPosition());// 将数据集中的数据移除

         mAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());// 刷新列表

     }

     /*获取移动标志*/

     @Override

     public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {

         // 拖拽的标记，这里允许上下左右四个方向

         int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;

         int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;// 滑动的标记，这里允许左右滑动

         return makeMovementFlags(dragFlags, swipeFlags);

     }

     /*当一个Item被另外的Item替代时回调，也就是数据集的内容顺序改变*/

     @Override

     public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {

         Collections.swap(arrayList, viewHolder.getAdapterPosition(), target.getAdapterPosition());

         return true;

     }

     @Override

     public void onMoved(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, int fromPos, RecyclerView.ViewHolder target, int toPos, int x, int y) {

         super.onMoved(recyclerView, viewHolder, fromPos, target, toPos, x, y);

         mAdapter.notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition());

     }

     /*Item是否可以长按 */

     @Override

     public boolean isLongPressDragEnabled() {

         return true;

     }

     /* Item是否可以滑动*/

     @Override

     public boolean isItemViewSwipeEnabled() {

         return true;

     }

     /* 当某个Item被滑动离开屏幕之后回调*/

     @Override

     public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {

         super.onSelectedChanged(viewHolder, actionState);

         if (viewHolder != null) {

             vh = viewHolder;

             pickUpAnimation(viewHolder.itemView);

         } else {

             if (vh != null) {

                 putDownAnimation(vh.itemView);

             }

         }

     }

     /*放下动画*/

     private void putDownAnimation(View view){

         ObjectAnimator animator = ObjectAnimator.ofFloat(view,"rotationY",0,180,0);//Y轴变动

         animator.setInterpolator(new DecelerateInterpolator());

         animator.setDuration(500);

         animator.start();

     }

     /*托起动画*/

     private void pickUpAnimation(View view) {

         ObjectAnimator animator = ObjectAnimator.ofFloat(view,"rotationX",0,180,0);

         animator.setInterpolator(new DecelerateInterpolator());

         animator.setDuration(500);

         animator.start();

     }

 }

MyItemTouchHelper

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