Android在recycleview中进行全选和取消全选

一、看图说话

二、源码

【git】https://gitee.com/naak2162/MySelectAll.git

【csdn不知道怎么设置免费下载】https://download.csdn.net/download/sinat_15411661/11141708

三、正文

1、关于临时json数据显示：assets文件夹内放置json资源文件

2、关于字符串操作的工具包：将string类型、integer类型的集合List、List转换成string字符串

3、封装Gson序列化工具类：

（1）在工程目录中build.gradle的dependencies中加入Gson的三方网络支持框架

 implementation 'com.google.code.gson:gson:2.8.2'

（2）简易封装Gson的Object解析、 List<T>解析、序列化工具类

public class GsonUtils {private static Gson gson = new Gson();public static <T> T parseJson(String jsonData, Class<T> type) {T result = gson.fromJson(jsonData, type);return result;}public static <T> List<T> parseJsonArray(String jsonData, Class<T> clazz) {List<T> result = new ArrayList<T>();if (!TextUtils.isEmpty(jsonData)) {try {JsonArray array = new JsonParser().parse(jsonData).getAsJsonArray();if (array != null) {for (JsonElement elem : array) {result.add(gson.fromJson(elem, clazz));}}} catch (JsonSyntaxException e) {Log.e("GsonUtils", "parseJsonArray error" + e);}}return result;}public static String toJson(Object object){return gson.toJson(object);}
}

4、源码解析：

（1）需要解析的json数据

[{"name": "筷" },{"name": "碗" },{ "name": "碟" }, {"name": "杯"},{"name": "勺"}]

（2）创建相应的bean类，设置标识isCheck

public class CleanGoods {/*** name : 筷*/public String name;public boolean isCheck;public String getName() {return name;}public void setName(String name) {this.name = name;}
}

（3）创建activity_main.xml

<?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="match_parent"android:background="@android:color/white"android:orientation="vertical"><android.support.v7.widget.RecyclerViewandroid:id="@+id/recycleView"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="11dp" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="38dp"android:orientation="horizontal"><Buttonandroid:id="@+id/btnYes"android:layout_width="match_parent"android:layout_height="42dp"android:layout_margin="12dp"android:layout_weight="1"android:background="@drawable/btn_bg"android:text="全选"android:textColor="@android:color/white"android:textSize="17sp" /><Buttonandroid:id="@+id/btnNo"android:layout_width="match_parent"android:layout_height="42dp"android:layout_margin="12dp"android:layout_weight="1"android:background="@drawable/btn_bg"android:text="全不选"android:textColor="@android:color/white"android:textSize="17sp" /><Buttonandroid:id="@+id/btnCommit"android:layout_width="match_parent"android:layout_height="42dp"android:layout_margin="12dp"android:layout_weight="1"android:background="@drawable/btn_bg"android:text="确  定"android:textColor="@android:color/white"android:textSize="17sp" /></LinearLayout><TextViewandroid:id="@+id/tvContent"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="26dp"android:hint="点击【确定】按钮显示文本"android:textColor="@color/colorPrimary"android:textColorHint="@android:color/darker_gray"android:textSize="18sp"android:textStyle="bold"/>
</LinearLayout>

（4）其中（3）的自定义drawable下的btn_bg.xml文件

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"><!-- 设置边框 --><solid android:color="@color/colorPrimary" /><!-- 填充的颜色 --><!-- 指定圆角矩形的4个圆角的半径 --><cornersandroid:bottomLeftRadius="3dp"android:bottomRightRadius="3dp"android:topLeftRadius="3dp"android:topRightRadius="3dp" />
</shape>

（5）创建适配器SelectGoodsAdapter.java文件

class SelectGoodsAdapter extends RecyclerView.Adapter<SelectGoodsAdapter.SelectGoodsHolder> {private List<CleanGoods> mData;private Context mContext;private LayoutInflater mInflater;private List<String> nameIdList = new ArrayList<>();SelectGoodsAdapter(Context context, List<CleanGoods> list) {this.mContext = context;mInflater = LayoutInflater.from(mContext);this.mData = new ArrayList<>();this.mData.addAll(list);}@SuppressLint("SetTextI18n")private void notifyData(List<CleanGoods> list) {if (list != null) {this.mData.clear();this.mData.addAll(list);}notifyDataSetChanged();for (int i = 0; i < mData.size(); i++) {if (mData.get(i).isCheck) {nameIdList.add(mData.get(i).getName());} else {nameIdList.remove(mData.get(i).getName());}}List<String> tempImages = removeDuplicate(nameIdList);}private List<String> removeDuplicate(List<String> list) {Set set = new LinkedHashSet<String>(list);list.clear();list.addAll(set);return list;}@NonNull@Overridepublic SelectGoodsHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = mInflater.inflate(R.layout.item_my_select, parent, false);SelectGoodsHolder holder = new SelectGoodsHolder(view);return holder;}@Overridepublic void onBindViewHolder(SelectGoodsHolder holder, int position) {final CleanGoods dataInfo = mData.get(position);holder.tvItem.setText(dataInfo.getName());final boolean isCheck = dataInfo.isCheck;if (isCheck) {holder.ivCheck.setImageResource(R.mipmap.image_check);} else {holder.ivCheck.setImageResource(R.mipmap.image_uncheck);}holder.llLayout.setOnClickListener(v -> {String newId = dataInfo.getName();for (CleanGoods dataInfo1 : datas) {String oldId = dataInfo1.name;if (newId.equals(oldId)) {boolean isCheck1 = dataInfo1.isCheck;if (isCheck1) {dataInfo1.isCheck = false;} else {dataInfo1.isCheck = true;setCheck(dataInfo);}break;}}notifyData(datas);});}public void setCheck(CleanGoods info) {if (checkNow.get(info.getName()) == null) {checkNow.put(info.getName(), info);} else {checkNow.remove(info.getName());}}@Overridepublic int getItemCount() {return mData.size();}class SelectGoodsHolder extends RecyclerView.ViewHolder {ImageView ivCheck;TextView tvItem;LinearLayout llLayout;SelectGoodsHolder(View itemView) {super(itemView);ivCheck = (ImageView) itemView.findViewById(R.id.ivCheck);tvItem = (TextView) itemView.findViewById(R.id.tvName);llLayout = (LinearLayout) itemView.findViewById(R.id.llLayout);}}}

设置被选中数据和移除数据：

public void setCheck(CleanGoods info) {if (checkNow.get(info.getName()) == null) {checkNow.put(info.getName(), info);} else {checkNow.remove(info.getName());}}

将选中的list数据按照顺序排放且不重复数据：

 private List<String> removeDuplicate(List<String> list) {Set set = new LinkedHashSet<String>(list);list.clear();list.addAll(set);return list;}

被选中数据或者取消被选中数据刷新recycleview：

@SuppressLint("SetTextI18n")private void notifyData(List<CleanGoods> list) {if (list != null) {this.mData.clear();this.mData.addAll(list);}notifyDataSetChanged();for (int i = 0; i < mData.size(); i++) {if (mData.get(i).isCheck) {nameIdList.add(mData.get(i).getName());} else {nameIdList.remove(mData.get(i).getName());}}List<String> tempImages = removeDuplicate(nameIdList);}

（6）创建item_my_select.xml文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"xmlns:card_view="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginLeft="3dp"android:layout_marginRight="3dp"android:layout_marginBottom="1dp"android:background="@android:color/white"android:foreground="?android:attr/selectableItemBackground"android:gravity="center"card_view:cardBackgroundColor="@android:color/white"card_view:cardCornerRadius="4dp"card_view:cardUseCompatPadding="true"><LinearLayoutandroid:id="@+id/llLayout"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:padding="11dp"><ImageViewandroid:id="@+id/ivCheck"android:layout_width="30dp"android:layout_height="30dp"android:layout_gravity="center_vertical"android:layout_marginLeft="15dp"android:src="@mipmap/image_uncheck" /><TextViewandroid:id="@+id/tvName"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_marginLeft="16dp"android:paddingTop="8dp"android:paddingRight="15dp"android:paddingBottom="8dp"android:text="食品生产经营者"android:textColor="@android:color/black"android:textSize="16sp" /></LinearLayout>
</android.support.v7.widget.CardView>

（7）创建适配器MainActivity.java文件，继承AppCompatActivity

public class MainActivity extends AppCompatActivity {@BindView(R.id.recycleView)RecyclerView recycleView;@BindView(R.id.tvContent)TextView tvContent;private List<CleanGoods> datas;private SelectGoodsAdapter adapter;private Map<String, CleanGoods> checkNow = new HashMap<String, CleanGoods>();private List<String> goodsName = new ArrayList<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);initData();}private void initData() {datas = new ArrayList<>();String jsonData = KitIOUtil.getStringFromAssets(this, "goods.json");datas = GsonUtils.parseJsonArray(jsonData, CleanGoods.class);recycleView.setLayoutManager(new LinearLayoutManager(this));adapter = new SelectGoodsAdapter(this, datas);recycleView.setAdapter(adapter);}@OnClick({R.id.btnYes, R.id.btnNo, R.id.btnCommit})public void onViewClicked(View view) {switch (view.getId()) {case R.id.btnYes:setData(true);break;case R.id.btnNo:setData(false);break;case R.id.btnCommit:if (adapter != null) {for (int i = 0; i < datas.size(); i++) {if (datas.get(i).isCheck) {goodsName.add(datas.get(i).getName());} else {goodsName.remove(datas.get(i).getName());}}List<String> tempNames = adapter.removeDuplicate(goodsName);String strNames = StringUtils.listToString(tempNames);tvContent.setText(strNames);}break;}}private void setData(boolean isAll) {for (CleanGoods data : datas) {if (isAll) {data.isCheck = true;adapter.setCheck(data);} else {data.isCheck = false;}}adapter.notifyData(datas);}
}

设置是否全选数据：

private void setData(boolean isAll) {for (CleanGoods data : datas) {if (isAll) {data.isCheck = true;adapter.setCheck(data);} else {data.isCheck = false;}}adapter.notifyData(datas);}

全选：

 setData(true);

全不选：

setData(false);

获取被选中数据的list数组：

if (adapter != null) {for (int i = 0; i < datas.size(); i++) {if (datas.get(i).isCheck) {goodsName.add(datas.get(i).getName());} else {goodsName.remove(datas.get(i).getName());}}List<String> tempNames = adapter.removeDuplicate(goodsName);Log.i("listData",GsonUtils.toJson(tempNames));
}

将list数组转换成string字符串：

String strNames = StringUtils.listToString(tempNames);
tvContent.setText(strNames);

四、如有疑问请留言