ListView中获取checkbox选中事件

这段时间在些项目时发现一个小技术点还是挺有意思的，特来总结一下，就是如何在ListView的item中自己写了一个checkbox，那么如何获取到这个item的checkbox的选中事件，进而怎样操作，比方说点击全选、取消后如何让checkbox被选择或者是取消，我们来一起学习一下。
先上代码

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="25dp"android:layout_centerVertical="true"><ImageView    android:id="@+id/iv_app_icon"    android:src="@mipmap/ic_launcher"    android:layout_width="48dp"    android:layout_height="48dp"    android:layout_centerVertical="true"/>    <TextView    android:id="@+id/tv_app_name"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_toRightOf="@id/iv_app_icon"    android:layout_centerVertical="true"    android:text="微信"    android:paddingLeft="18dp"    android:textSize="15dp"/>    <CheckBox    android:id="@+id/cb_app_uninstall"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignParentRight="true"    android:layout_centerVertical="true"    android:focusable="false"    android:clickable="false"/></RelativeLayout>

大家可以看到我将checkbox命名为cb_app_uninstall，其实主要是一个与卸载相关的选中键，然后我将adapter与holder提取出来单独封装为一个类

import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import java.util.ArrayList;//这个是自定义的adpter的基类public class MyBaseAdapter<T> extends BaseAdapter {private ArrayList<T> dataList;private Context mContext;LayoutInflater inflater;public MyBaseAdapter(Context context,ArrayList<T> dataList){    this.mContext = context;    this.dataList = dataList;    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);}@Overridepublic int getCount() {    return dataList.size();}@Overridepublic Object getItem(int position) {    return dataList.get(position);}@Overridepublic long getItemId(int position) {    return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    return null;    }}

下面是我单独提取出来的AppManagerAdapter

import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.TextView;import com.qingcheng.mobilemanager.R;import com.qingcheng.mobilemanager.bean.AppInfo;import com.qingcheng.mobilemanager.holder.AppViewholder;import java.util.ArrayList;import java.util.List;public class AppManagerAdapter extends MyBaseAdapter<AppInfo> {private Context mContext;private ArrayList<AppInfo> mDatas;public List<Boolean> mChecked;public AppManagerAdapter(Context context, ArrayList<AppInfo> dataList) {    super(context, dataList);    this.mContext = context;    this.mDatas = dataList;    mChecked = new ArrayList<Boolean>();    for (int i = 0; i < dataList.size(); i++){        mChecked.add(false);    }}@Overridepublic AppInfo getItem(int position) {    return mDatas.get(position);}@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {    AppViewholder holder ;    if (convertView == null){        convertView = View.inflate(mContext,R.layout.list_item_app_manager,null);        holder = new AppViewholder();        holder.ivAppIcon = (ImageView)convertView.findViewById(R.id.iv_app_icon);        holder.tvAppName = (TextView) convertView.findViewById(R.id.tv_app_name);        holder.cbAppUninstall = (CheckBox) convertView.findViewById(R.id.cb_app_uninstall);        convertView.setTag(holder);    }else{        holder = (AppViewholder) convertView.getTag();    }    AppInfo info = getItem(position);    holder.ivAppIcon.setImageDrawable(info.appIcon);    holder.tvAppName.setText(info.appName);    holder.cbAppUninstall.setChecked(mChecked.get(position));    return convertView;    }}

BaseHolder是holder的基类

import android.view.View;public  abstract class BaseHolder<T> {public View convertView;public T mData;public BaseHolder(){    convertView = initView();    convertView.setTag(this);}public abstract View initView();public void setData(T data){    mData = data;    }}

这个是我抽取出来的AppViewholder

import android.view.View;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.TextView;import com.qingcheng.mobilemanager.R;import com.qingcheng.mobilemanager.bean.AppInfo;import com.qingcheng.mobilemanager.utils.UiUtils;public class AppViewholder extends BaseHolder<AppInfo> {public ImageView ivAppIcon;public TextView tvAppName;public CheckBox cbAppUninstall;@Overridepublic View initView() {    View view = UiUtils.inflate(R.layout.list_item_app_manager);    ivAppIcon = (ImageView) view.findViewById(R.id.iv_app_icon);    tvAppName = (TextView) view.findViewById(R.id.tv_app_name);    cbAppUninstall = (CheckBox) view.findViewById(R.id.cb_app_uninstall);    return view;}@Overridepublic void setData(AppInfo data) {    super.setData(data);    tvAppName.setText(mData.appName);    }}

好了，现在来说说我们的正事，如何获取listview中checkbox的选中事件

首先不知道大家有没有注意到我在AppManagerAdapter中设置了一个

public List<Boolean> mChecked;

mChecked集合 就是一切的关键

//先在AppManagerAdapter中定义mChecked的长度并赋值mChecked = new ArrayList<Boolean>();    for (int i = 0; i < dataList.size(); i++){        mChecked.add(false);    }

然后在getView中set

holder.cbAppUninstall.setChecked(mChecked.get(position));

再在Activity中对listView的item获取点击事件,先要对listView设置监听，并对checkbox的点击事件设置为

    android:focusable="false"    android:clickable="false"

如果不这么设置会让listView的item得不到点击事件

    /**     * 每个item被点击监听     */     lvAppDisplay.setOnItemClickListener(new AdapterView.OnItemClickListener() {        @Override        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {            if (mAdapter.mChecked.get(position)){                mAdapter.mChecked.set(position,false);            }else if (!mAdapter.mChecked.get(position)){                mAdapter.mChecked.set(position,true);            }            mAdapter.notifyDataSetChanged();        }    });

这样就可以及时获取checkbox的点击事件并及时更新控制他们的mChecked的状态

当想要点击一个类似全选的按钮达到全选的效果时可以这样做

private boolean checkedAll = false;    /**     * 全选事件     */     tvCheckAll.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {            if (!checkedAll){                for (int i = 0; i < mDatas.size(); i++){                  mAdapter.mChecked.set(i,true);                }                checkedAll = true;                mAdapter.notifyDataSetChanged();            }else{                for (int i = 0; i < mDatas.size(); i++){                    mAdapter.mChecked.set(i,false);                }                checkedAll = false;                mAdapter.notifyDataSetChanged();            }            }    });

这样就完美实现了在全选和全部取消之间的切换，从而我们就可以另一个方法中获取被选中item的position

    for (int i = 0;i< mAdapter.mChecked.size();i++){            if (mAdapter.mChecked.get(i)){                //listItemID为被选中item的position                listItemID.add(i);            }        }