频道

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频道

导入依赖：implementation ‘com.android.support:recyclerview-v7:28.0.0’

main_activity

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android=""xmlns:app=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><android.support.v7.widget.RecyclerViewandroid:id="@+id/contents"android:layout_width="0dp"android:layout_height="0dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent" /></android.support.constraint.ConstraintLayout>

item_channel_normal未选择

<?xml version="1.0" encoding="utf-8"?>
<FrameLayoutxmlns:android=""android:layout_width="match_parent"android:layout_height="wrap_content"android:paddingTop="4dp"android:paddingLeft="4dp"android:paddingBottom="4dp"android:paddingRight="4dp"><TextViewandroid:id="@+id/text"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="频道管理"android:gravity="center_horizontal"android:textSize="24sp"android:background="@drawable/shape_background"/></FrameLayout>

item_channel_selected选择

<?xml version="1.0" encoding="utf-8"?>
<FrameLayoutxmlns:android="" android:layout_width="match_parent"android:layout_height="wrap_content"android:paddingTop="4dp"android:paddingLeft="4dp"android:paddingBottom="4dp"android:paddingRight="4dp"><TextViewandroid:id="@+id/text"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="频道管理"android:gravity="center_horizontal"android:textSize="24sp"android:background="@drawable/shape_background"/></FrameLayout>

item_channel_title标题

<?xml version="1.0" encoding="utf-8"?>
<TextViewxmlns:android="" android:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/text"android:paddingRight="16dp"android:paddingLeft="16dp"android:paddingBottom="8dp"android:paddingTop="8dp"android:text="标题"android:textColor="@android:color/black"android:textSize="28sp"></TextView>

item_text文本

<?xml version="1.0" encoding="utf-8"?>
<TextViewxmlns:android="" android:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/text"android:padding="16dp"android:textSize="24sp"></TextView>

MainActivity页面

package com.example.text_1120;import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity {private RecyclerView contents;private ChannelManagerAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);contents=findViewById(R.id.contents);//优化contents.setHasFixedSize(true);adapter=new ChannelManagerAdapter(this);//布局管理器GridLayoutManager manager=new GridLayoutManager(this,4);//item跨列显示manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {@Overridepublic int getSpanSize(int i) {return adapter.isTitle(i)?4:1;}});contents.setLayoutManager(manager);adapter.setOnItemClickListener(new ChannelManagerAdapter.OnItemClickListener() {@Overridepublic void onItemClick(View itemView, int position) {if(position < 0) {Toast.makeText(MainActivity.this, "太快啦", Toast.LENGTH_LONG).show();return;}if (!isEditMode&&adapter.isSelectedChannel(position)){Toast.makeText(MainActivity.this,"选中了条目，返回："+position,Toast.LENGTH_LONG).show();return;}//移除ChannelManagerBean removeBean=adapter.removeItem(position);removeBean.setSelected(!removeBean.isSelected());//添加adapter.addItem(removeBean);}});contents.setAdapter(adapter);loadData();}private void loadData() {List<ChannelManagerBean> selectedDatas=new ArrayList<>();List<ChannelManagerBean> normalDatas=new ArrayList<>();selectedDatas.add(new ChannelManagerBean("关注",true,false));selectedDatas.add(new ChannelManagerBean("推荐",true,false));selectedDatas.add(new ChannelManagerBean("科学",true,false));selectedDatas.add(new ChannelManagerBean("美食",true,false));selectedDatas.add(new ChannelManagerBean("养生",true,false));selectedDatas.add(new ChannelManagerBean("电影",true,false));selectedDatas.add(new ChannelManagerBean("生活",true,false));selectedDatas.add(new ChannelManagerBean("搞笑",true,false));selectedDatas.add(new ChannelManagerBean("懂车",true,false));selectedDatas.add(new ChannelManagerBean("军事",true,false));selectedDatas.add(new ChannelManagerBean("党媒",true,false));selectedDatas.add(new ChannelManagerBean("历史",true,false));selectedDatas.add(new ChannelManagerBean("体育",true,false));normalDatas.add(new ChannelManagerBean("宠物",false,true));normalDatas.add(new ChannelManagerBean("娱乐",false,true));normalDatas.add(new ChannelManagerBean("财经",false,true));normalDatas.add(new ChannelManagerBean("直播",false,true));normalDatas.add(new ChannelManagerBean("特卖",false,true));normalDatas.add(new ChannelManagerBean("房产",false,true));normalDatas.add(new ChannelManagerBean("小说",false,true));normalDatas.add(new ChannelManagerBean("时尚",false,true));normalDatas.add(new ChannelManagerBean("音频",false,true));normalDatas.add(new ChannelManagerBean("育儿",false,true));normalDatas.add(new ChannelManagerBean("数码",false,true));normalDatas.add(new ChannelManagerBean("健康",false,true));normalDatas.add(new ChannelManagerBean("手机",false,true));normalDatas.add(new ChannelManagerBean("传媒",false,true));normalDatas.add(new ChannelManagerBean("星座",false,true));normalDatas.add(new ChannelManagerBean("精选",false,true));normalDatas.add(new ChannelManagerBean("收藏",false,true));normalDatas.add(new ChannelManagerBean("故事",false,true));adapter.setChannelDatas(selectedDatas,normalDatas);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.menu,menu);return true;}private boolean isEditMode=false;@Overridepublic boolean onOptionsItemSelected(MenuItem item) {if (item.getItemId()==R.id.e_action){isEditMode=!isEditMode;item.setTitle(isEditMode?"完成":"编辑");return true;}return super.onOptionsItemSelected(item);}
}

ChannelManagerBean

package com.example.text_1120;public class ChannelManagerBean {//名称private String name;//是否选择的频道private boolean isSelected;//是否当前的频道private boolean isCurrent;//是否固定不能更改private boolean isFixted;public ChannelManagerBean(String name, boolean isSelected, boolean isCurrent) {this.name = name;this.isSelected = isSelected;this.isCurrent = isCurrent;}public String getName(){return !isSelected?"+"+name:name;}public void setName(String name) {this.name = name;}public boolean isSelected() {return isSelected;}public void setSelected(boolean selected) {isSelected = selected;}public boolean isCurrent() {return isCurrent;}public void setCurrent(boolean current) {isCurrent = current;}public boolean isFixted() {return isFixted;}public void setFixted(boolean fixted) {isFixted = fixted;}
}

ChannelManagerAdapter适配器

package com.example.text_1120;import android.content.Context;
import android.support.annotation.NonNull;
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.List;public class ChannelManagerAdapter extends RecyclerView.Adapter<ChannelManagerAdapter.ViewHolder> {private List<ChannelManagerBean> selectedChange;private List<ChannelManagerBean> normalChange;private Context context;public  ChannelManagerAdapter(Context context) {this.context = context;selectedChange=new ArrayList<>();normalChange=new ArrayList<>();}@Overridepublic int getItemViewType(int position) {if (isTitle(position)){return R.layout.item_change_title;}if (isSelectedChannel(position)){return R.layout.item_change_selected;}return R.layout.item_change_normal;}public ChannelManagerBean getItem(int position){if (isTitle(position)){return null;}//第一个选中频道列表的数据if (isSelectedChannel(position)){return selectedChange.get(position-1);}//第二个未选中批到列表的数据return normalChange.get(position - selectedChange.size()-2);}//是否是选中频道的标题boolean isTitle(int position) {return isSelTitle(position)||isNomTitle(position);}//当前频道是否是选中的频道public boolean isSelectedChannel(int position){return position<=selectedChange.size();}//是否是普通的标题private boolean isNomTitle(int position) {return position==selectedChange.size()+1;}//是否是选中的标题private boolean isSelTitle(int position) {return position==0;}public void setChannelDatas(List<ChannelManagerBean> selectedChange,List<ChannelManagerBean> normalChange) {this.selectedChange = selectedChange;this.normalChange=normalChange;notifyDataSetChanged();}public ChannelManagerBean removeItem(int position){ChannelManagerBean channelManagerBean=null;if (isSelectedChannel(position)){channelManagerBean=selectedChange.remove(position-1);}else {channelManagerBean=normalChange.remove(position-selectedChange.size()-2);}notifyItemRemoved(position);return channelManagerBean;}public void addItem(ChannelManagerBean item){if (item.isSelected()){selectedChange.add(item);notifyItemInserted(selectedChange.size());}else {normalChange.add(0,item);notifyItemInserted(selectedChange.size()+2);}}@NonNull@Overridepublic ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {if (i==R.layout.item_change_title){return new ViewHolder(LayoutInflater.from(context).inflate(i,viewGroup,false));}else{return new ViewHolder(LayoutInflater.from(context).inflate(i,viewGroup,false), listener);}}@Overridepublic void onBindViewHolder(@NonNull ChannelManagerAdapter.ViewHolder viewHolder, int i) {if (isSelTitle(i)){viewHolder.text.setText("我的频道");return;}if (isNomTitle(i)){viewHolder.text.setText("频道管理");return;}viewHolder.text.setText(getItem(i).getName());}@Overridepublic int getItemCount() {return selectedChange.size()+normalChange.size()+2;}private OnItemClickListener listener;public ChannelManagerAdapter setOnItemClickListener(OnItemClickListener listener){this.listener=listener;return this;}public interface OnItemClickListener{void onItemClick(View itemView,int position);}class ViewHolder extends RecyclerView.ViewHolder{TextView text;public ViewHolder(@NonNull View itemView) {super(itemView);text=itemView.findViewById(R.id.text);}public ViewHolder(View itemView,final OnItemClickListener listener){this(itemView);itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (listener==null){return;}listener.onItemClick(ViewHolder.this.itemView,getAdapterPosition());}});}}
}

Shape矩形边角

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android=""><solid android:color="#ffffff"/><stroke android:width="1dp"android:color="#00ffff"/><cornersandroid:radius="8dp"/></shape>

Menu

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android=""xmlns:app=""><item android:id="@+id/e_action" android:title="编辑" app:showAsAction="always"/>
</menu>

本文标签： 频道