RecyclerView的Item點選事件,增加刪除Item瀑布流動畫效果,長按拖動Item,RecyclerView複雜佈局、實現新聞頻道選擇器
RecyclerView的Item點選事件的實現,增加和刪除Item使用瀑布流動畫效果,長按拖動Item,RecyclerView複雜佈局的實現使用、RecyclerView去實現今日頭條新聞頻道選擇器。 使用ItemTouchHelper實現Item的拖動交換,由於RecyclerView本身沒有自帶的Item點選事件所以我們仿照ListView的Item點選事件利用RecyclerView自帶findChildViewUnder方法的自己實現點選效果。 首先我們來看一下demo的執行效果: demo原始碼下載連線:(http://download.csdn.net/detail/qq_30000411/9700050
接下來是我們程式碼的實現,(注:本demo拖動事件的實現為不同型別的Item之間不能進行拖動)。
RecyclerView的介面卡的實現擴充套件Item自定義的交換的介面並且重寫交換方法,每個Item佈局建立不同的ViewHolder,利用GridLayoutManager來實現每一個Item應該怎樣放置(傳入每個型別的公倍數)。 複雜佈局不用型別的Item每行多少列的程式碼如下:
GridLayoutManager gridLayoutManager = new GridLayoutManager(this.getApplicationContext(),4); gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() { @Override public int getSpanSize(int position) { AddPinDao addPinDao = addPinDaos.get(position); if (addPinDao.getTag() == 0 || addPinDao.getTag() == 2){ return 4; }else { return 1; } } });
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介面卡的程式碼如下:
import android.content.Context; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import java.util.Collections; import java.util.List; /** * 介面卡新增頻道的recyclerview 的介面卡 * Created by lwp940118 on 2016/11/28. */ public class RecyclerView_Add_Adapter extends RecyclerView.Adapter implements RecyclerViewAddItemCallBackListener{ private int tag = 0; private List<AddPinDao> addPinDaos; private Context context; public RecyclerView_Add_Adapter(List<AddPinDao> addPinDaos,Context context){ super(); this.addPinDaos = addPinDaos; this.context = context; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = null; RecyclerView.ViewHolder viewHolder = null; switch (viewType){ case 0: view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_one ,parent,false); viewHolder = new ViewHolderOne(view); break; case 1: view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_my ,parent,false); viewHolder = new ViewHolderMy(view); break; case 2: view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_tow ,parent,false); viewHolder = new ViewHolderTow(view); break; case 3: view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_pindao ,parent,false); viewHolder = new ViewHolderPinDao(view); } return viewHolder; } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { AddPinDao addPinDao = addPinDaos.get(position); switch (getItemViewType(position)){ case 0: final ViewHolderOne viewHolderOne = (ViewHolderOne)holder; viewHolderOne.textView_one.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (tag == 0) { viewHolderOne.textView_one.setText("完 成"); viewHolderOne.textView_tuodong.setText("拖動可以排序"); tag = 1; Log.e("----t2",""+tag); for (int i = 0;i < addPinDaos.size();i++){ if (addPinDaos.get(i).getTag() == 1){ addPinDaos.get(i).setMyTag(1); } } notifyDataSetChanged(); }else { viewHolderOne.textView_one.setText("編 輯"); viewHolderOne.textView_tuodong.setText(""); tag = 0; Log.e("----t1",""+tag); for (int i = 0;i < addPinDaos.size();i++){ if (addPinDaos.get(i).getTag() == 1){ addPinDaos.get(i).setMyTag(0); } } notifyDataSetChanged(); } } }); break; case 1: final ViewHolderMy viewHolderMy = (ViewHolderMy)holder; viewHolderMy.textView_my.setText(addPinDao.getMessage()); if (addPinDao.getMyTag() == 1) { viewHolderMy.imageView_my.setVisibility(View.VISIBLE); }else { viewHolderMy.imageView_my.setVisibility(View.INVISIBLE); } break; case 2: final ViewHolderTow viewHolderTow = (ViewHolderTow)holder; break; case 3: final ViewHolderPinDao viewHolderPinDao = (ViewHolderPinDao)holder; viewHolderPinDao.textView_pin.setText(addPinDao.getMessage()); break; } } @Override public int getItemCount() { return addPinDaos.size(); } @Override public int getItemViewType(int position) { AddPinDao addPinDao = addPinDaos.get(position); switch (addPinDao.getTag()){ case 0: return 0; case 1: return 1; case 2: return 2; case 3: return 3; } return 0; } @Override public void onMove(int fromPosition, int toPosition) { AddPinDao addPinDao = addPinDaos.get(fromPosition); AddPinDao addPinDao1 = addPinDaos.get(toPosition); if (fromPosition != 1 && toPosition != 1) { if ((addPinDao.getTag() == 1 && addPinDao1.getTag() == 1) || (addPinDao.getTag() == 3 && addPinDao1.getTag() == 3)) { //通知陣列的移動 Collections.swap(addPinDaos, fromPosition, toPosition); notifyItemMoved(fromPosition, toPosition); } } } class ViewHolderMy extends RecyclerView.ViewHolder{ private TextView textView_my; private ImageView imageView_my; public ViewHolderMy(View itemView) { super(itemView); imageView_my = (ImageView)itemView.findViewById(R.id.imageView_recyclerview_add_itme_my); textView_my = (TextView)itemView.findViewById(R.id.textview_recyelerview_add_item_my); } } class ViewHolderPinDao extends RecyclerView.ViewHolder{ private TextView textView_pin; public ViewHolderPinDao(View itemView) { super(itemView); textView_pin = (TextView) itemView.findViewById(R.id.textview_recyelerview_add_item_pindao); } } class ViewHolderOne extends RecyclerView.ViewHolder{ private TextView textView_tuodong; private TextView textView_one; public ViewHolderOne(View itemView) { super(itemView); textView_one = (TextView)itemView.findViewById(R.id.textview_recyclerview_add_item_one); textView_tuodong = (TextView)itemView.findViewById(R.id.textview_recyclerview_add_item_one_tuodong); } } class ViewHolderTow extends RecyclerView.ViewHolder{ public ViewHolderTow(View itemView) { super(itemView); } } }
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Item交換介面的實現:
public interface RecyclerViewAddItemCallBackListener {
/**
* itme交換的介面
* @param fromPosition
* @param toPosition
*/
void onMove(int fromPosition,int toPosition);
}
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利用ItemTouchHelper實現RecyclerView的Item長按拖動交換程式碼:
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.helper.ItemTouchHelper;
/**
* Created by lwp940118 on 2016/12/2.
*/
public class OnItemCallbackHelper extends ItemTouchHelper.Callback {
private RecyclerView_Add_Adapter recyclerView_add_adapter;
public OnItemCallbackHelper(RecyclerView_Add_Adapter recyclerView_add_adapter){
this.recyclerView_add_adapter = recyclerView_add_adapter;
}
/**
* 是否刪除
* @return
*/
@Override
public boolean isItemViewSwipeEnabled() {
return false;
}
/**
* 是否拖住
* @return
*/
@Override
public boolean isLongPressDragEnabled() {
return true;
}
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int dragFlags;
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if(layoutManager instanceof GridLayoutManager || layoutManager instanceof StaggeredGridLayoutManager){
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN|ItemTouchHelper.START | ItemTouchHelper.END;
}else{
dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
}
int swipeFlag = 0;
return makeMovementFlags(dragFlags,swipeFlag);
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
RecyclerView.ViewHolder target) {
recyclerView_add_adapter.onMove(viewHolder.getAdapterPosition(),
target.getAdapterPosition());
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
}
}
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利用OnItemTouchListener實現對RecyclerViewItem的點選:
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
/**
* Created by lwp940118 on 2016/12/2.
*/
public class RecyclerViewAddItemOnClickListener implements RecyclerView.OnItemTouchListener{
public interface OnItemClickListener{
void onItemCilck(View view, int position);
}
private OnItemClickListener onItemClickListener;
private GestureDetector gestureDetector;
public RecyclerViewAddItemOnClickListener(Context context, final RecyclerView recyclerView,
OnItemClickListener onItemClickListener){
this.onItemClickListener = onItemClickListener;
gestureDetector = new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
@Override
public void onLongPress(MotionEvent e) {
super.onLongPress(e);
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View view = rv.findChildViewUnder(e.getX(),e.getY());
if (view != null && onItemClickListener != null && gestureDetector.onTouchEvent(e)
&& rv.getChildPosition(view) > 1){
onItemClickListener.onItemCilck(view,rv.getChildPosition(view));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
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為了實現今日頭條的頻道選擇效果所以在Item的點選之後會出現Item的移動,為了簡單、方便的實現該效果,我沒有重寫View的動畫,而是利用RecyclerView的增加和刪除代替View的移動效果。因此在Item的點選事件中需要出現Item的增加和刪除邏輯操作,進而就產生了一個處理RecyclerView的增加刪除類。程式碼如下:
import java.util.List;
/**
* Created by lwp940118 on 2016/12/2.
*/
public class RecyclerViewAddItemExchange {
private int position;
private RecyclerView_Add_Adapter recyclerView_add_adapter;
private List<AddPinDao> addPinDaos;
public RecyclerViewAddItemExchange(int position,
RecyclerView_Add_Adapter recyclerView_add_adapter,
List<AddPinDao> addPinDaos){
this.position = position;
this.recyclerView_add_adapter = recyclerView_add_adapter;
this.addPinDaos = addPinDaos;
itemExchange();
}
private void itemExchange(){
AddPinDao addPinDao = addPinDaos.get(position);
int toposition = position ;
if (addPinDao.getTag() == 1){
for (int i = 2; i < addPinDaos.size(); i++){
if (addPinDaos.get(i).getTag() == 3){
toposition = i;
break;
}
}
addPinDao.setTag(3);
addPinDaos.remove(position);
recyclerView_add_adapter.notifyItemRemoved(position);
addPinDaos.add(toposition - 1,addPinDao);
recyclerView_add_adapter.notifyItemInserted(toposition - 1);
}else if (addPinDao.getTag() == 3){
addPinDaos.get(position).setTag(1);
for (int i = 2; i < addPinDaos.size(); i++){
if (addPinDaos.get(i).getTag() == 2){
toposition = i;
break;
}
}
addPinDao.setTag(1);
addPinDaos.remove(position);
recyclerView_add_adapter.notifyItemRemoved(position);
addPinDaos.add(toposition,addPinDao);
recyclerView_add_adapter.notifyItemInserted(toposition);
}
}
}
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對於資料物件的定義:
/**
* recyclerview 的item的 頻道漢字列表D的類
* Created by lwp940118 on 2016/11/28.
*/
public class AddPinDao {
private String message;
private int tag;
private int myTag;
public int getMyTag() {
return myTag;
}
public void setMyTag(int myTag) {
this.myTag = myTag;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public int getTag() {
return tag;
}
public void setTag(int tag) {
this.tag = tag;
}
}
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Activity的程式碼實現:
import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity implements View.OnClickListener{
private ImageButton imageButton_add_back;
private RecyclerView recyclerView_add;
private RecyclerView_Add_Adapter recyclerView_add_adapter = null;
private List<AddPinDao> addPinDaos = new ArrayList<AddPinDao>();
private RecyclerViewAddItemCallBackListener recyclerViewAddItemCallBackListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initView();
}
private void initData(){
for (int i = 0 ; i < 4;i++){
if (i == 1){
for (int t = 0 ; t < 20;t++){
AddPinDao addPinDao = new AddPinDao();
addPinDao.setTag(1);
addPinDao.setMessage("首頁"+t);
addPinDao.setMyTag(0);
addPinDaos.add(addPinDao);
}
}
AddPinDao addPinDao = new AddPinDao();
addPinDao.setTag(i);
addPinDao.setMessage("wq"+i);
addPinDao.setMyTag(0);
addPinDaos.add(addPinDao);
}
for (int i = 0 ; i < 30;i++){
AddPinDao addPinDao = new AddPinDao();
addPinDao.setTag(3);
addPinDao.setMessage("wq"+i);
addPinDao.setMyTag(0);
addPinDaos.add(addPinDao);
}
}
private void initView(){
imageButton_add_back = (ImageButton)findViewById(R.id.imagebutton_add_back);
imageButton_add_back.setOnClickListener(this);
recyclerView_add = (RecyclerView)findViewById(R.id.recylerView_add);
if (recyclerView_add_adapter == null){
recyclerView_add_adapter = new RecyclerView_Add_Adapter(addPinDaos,this);
}
GridLayoutManager gridLayoutManager = new
GridLayoutManager(this.getApplicationContext(),4);
gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
AddPinDao addPinDao = addPinDaos.get(position);
if (addPinDao.getTag() == 0 || addPinDao.getTag() == 2){
return 4;
}else {
return 1;
}
}
});
recyclerView_add.setLayoutManager(gridLayoutManager);
recyclerView_add.setAdapter(recyclerView_add_adapter);
recyclerView_add.setItemAnimator(new DefaultItemAnimator());
ItemTouchHelper.Callback callback = new OnItemCallbackHelper(recyclerView_add_adapter);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
itemTouchHelper.attachToRecyclerView(recyclerView_add);
recyclerView_add.addOnItemTouchListener(new RecyclerViewAddItemOnClickListener(
getApplicationContext(),recyclerView_add,new RecyclerViewAddItemOnClickListener
.OnItemClickListener(){
@Override
public void onItemCilck(View view, int position) {
Log.e("---","點選了"+position);
RecyclerViewAddItemExchange recyclerViewAddItemExchange = new
RecyclerViewAddItemExchange(position,recyclerView_add_adapter,addPinDaos);
}
}));
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.imagebutton_add_back:
break;
}
}
}
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然後就是 各個XML的佈局檔案, activity的xml為:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/dibu">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="49dp"
android:orientation="horizontal">
<TextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginLeft="10dp"
android:layout_gravity="center"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="頻道選擇"
android:textSize="20sp"
android:textColor="@color/radiobutton"
android:gravity="center"/>
<ImageButton
android:id="@+id/imagebutton_add_back"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_marginRight="10dp"
android:layout_gravity="center"
android:background="@mipmap/quxiao"/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recylerView_add"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="@color/dibu">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
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四個Item的介面佈局分別為:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_margin="5dp"
android:background="@color/dibu">
<TextView
android:layout_width="wrap_content"
android:layout_height="40dp"
android:gravity="left|center"
android:layout_marginLeft="5dp"
android:text="我的頻道"
android:textSize="16sp"
android:textColor="#0b0b0b"/>
<TextView
android:id="@+id/textview_recyclerview_add_item_one_tuodong"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:gravity="left|center"
android:textSize="12sp"
android:layout_marginLeft="5dp"
android:text=""
android:textColor="#bababa"/>
<TextView
android:id="@+id/textview_recyclerview_add_item_one"
android:layout_width="60dp"
android:layout_height="26dp"
android:textColor="@color/radiobuttonzhong"
android:gravity="center"
android:text="編 輯"
android:layout_marginRight="10dp"
android:background="@drawable/textview_background_read"
android:textSize="16sp"/>
</LinearLayout>
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_margin="5dp">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textview_recyelerview_add_item_my"
android:layout_width="match_parent"
android:layout_height="30dp"
android:gravity="center"
android:textSize="14sp"
android:text="News"
android:background="@color/baise"/>
<ImageView
android:id="@+id/imageView_recyclerview_add_itme_my"
android:layout_width="10dp"
android:layout_height="10dp"
android:background="@mipmap/shanchu"
android:layout_gravity="right"/>
</FrameLayout>
</LinearLayout>
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_margin="5dp"
android:background="@color/dibu">
<TextView
android:id="@+id/textview_recyelerview_add_item_pindao"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="40dp"
android:gravity="left|center"
android:layout_marginLeft="5dp"
android:text="推薦頻道"
android:textSize="16sp"
android:textColor="#087bf7"/>
</LinearLayout>
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_margin="5dp"
android:background="@color/dibu">
<TextView
android:id="@+id/textview_recyelerview_add_item_pindao"
android:layout_width="match_parent"
android:layout_height="30dp"
android:gravity="center"
android:textSize="14sp"
android:text="News"
android:background="@color/colorAccent"/>
</LinearLayout>
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到此已經全部實現,仿今日頭條的頻道選擇器。RecyclerViewItem的交換點選增加刪除複雜佈局。
--------------------- 本文來自 xy_liwp 的CSDN 部落格 ,全文地址請點選:https://blog.csdn.net/qq_30000411/article/details/53436523?utm_source=copy