ListView和CheckBox的混乱问题

原作者 地址 http://blog.csdn.net/jiang89125/article/details/50379364

干货 ：解决方法：由于是因为index错误造成的，那么只要保证index值与当前positon保持一至即可，只要把添加监听器的方法加到初始化view中checkBox状态的代码之前即可。这样即始由于初始化造成调用了onCheckedChange()方法，也因为其中index值是最新的，而依然不会错乱。

主要是解决我以前的一篇博客仿微信添加群聊界面——addView里listview和checkbox混乱的问题

先来上BUG图，我在添加了数据，让listview能滚动起来后就发现了这个问题 
 
大家看图，我只点击了0，滑动后结果10也被点击了，而且再滑回去，被选中的项也会发生变化。这个问题弄了好久，一直没有解决，后来看到了一篇博客Android ListView CheckBox状态错乱，这里他讲的很详细。 
我的理解： 
这里会出现这个问题的主要原因是convertView的使用，不管listView里显示多少条数据，都只是共用那么几个对象，然后我们的代码每一次把得到的对象重新赋值而已。正是在这赋值的时候出了问题，假设Android系统给我们生成了10个共用view对象，第一个view对象在第一屏的时候需要显示成”未选择”状态，而到了第二屏的时候，却要显示成”选择”状态，但由于是共用的同一个对象，根据第一点得知当checkBox的状态改变的时候,会调用onCheckedChanged()方法。 
先看一下他给出的错误代码：

public class ListViewCheckBox extends Activity{    private ListView listView;    private List<A> list;    private Adapter1 adapter1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.listview_checkbox);        initDate();        listView = (ListView)findViewById(R.id.listView);        adapter1 = new Adapter1();        listView.setAdapter(adapter1);    }    /**     * 模拟40个数据，奇数数据为选中状态，偶数数据为非选中状态     */    private void initDate(){        list = new ArrayList<A>();        A a;        for(int i=0;i<40;i++){            if(i%2==0){                a = new A(i+"号位",A.TYPE_NOCHECKED);                list.add(a);            }else{                a = new A(i+"号位",A.TYPE_CHECKED);                list.add(a);            }        }    }    class Adapter1 extends BaseAdapter{        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int position) {            return null;        }        @Override        public long getItemId(int position) {            return 0;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            final int index = position;            ViewHolder viewHolder;            if(convertView == null){                viewHolder = new ViewHolder();                convertView = LayoutInflater.from(ListViewCheckBox.this).inflate(R.layout.listview_checkbox_item, null);                viewHolder.layout = (LinearLayout)convertView.findViewById(R.id.layout);                viewHolder.textView = (TextView)convertView.findViewById(R.id.textView);                viewHolder.checkBox = (CheckBox)convertView.findViewById(R.id.checkBox);                convertView.setTag(viewHolder);            }else{                viewHolder = (ViewHolder)convertView.getTag();            }            viewHolder.textView.setText(list.get(position).name);            if(list.get(position).type == A.TYPE_CHECKED){                viewHolder.checkBox.setChecked(true);            }else{                viewHolder.checkBox.setChecked(false);            }            /*点击checkBox所在行改变checkBox状态*/            /*final ViewHolder vv = viewHolder;            viewHolder.layout.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                    if(vv.checkBox.isChecked()){                        vv.checkBox.setChecked(false);                        list.get(index).type = TYPE_CHECKED;                    }else{                        vv.checkBox.setChecked(true);                        list.get(index).type = TYPE_NOCHECKED;                    }                }            });*/            viewHolder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {                @Override                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                    if(isChecked){                        list.get(index).type = A.TYPE_CHECKED;                    }else{                        list.get(index).type = A.TYPE_NOCHECKED;                    }                }            });            return convertView;        }    }    class ViewHolder{        LinearLayout layout;        TextView textView;        CheckBox checkBox;    }    class A {        public static final int TYPE_CHECKED = 1;        public static final int TYPE_NOCHECKED = 0;        String name;        int type;        public A(String name,int type){            this.name = name;            this.type = type;        }    }}
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看代码添加监听器的代码在初始化checkBox属性的代码之后，也就是说当初始化checkBox属性时，由于可能改变其状态,导致调用了onCheckedChanged()方法，而这个监听器是在上一次初始化的时候添加的，那么当然其index就是上一次的positon值，而不是本次的，所以每次保存checkBox属性状态的时候，都把值赋到的list集合里其它对象上去了，而不是与本次index相关的对象上，这才是发生莫名其妙错乱的真正原因。

解决方法：由于是因为index错误造成的，那么只要保证index值与当前positon保持一至即可，只要把添加监听器的方法加到初始化view中checkBox状态的代码之前即可。这样即始由于初始化造成调用了onCheckedChange()方法，也因为其中index值是最新的，而依然不会错乱。

按照他的解决方案，我首先尝试了将他的代码跑一遍。（我略微修改了一下，方便观察）

public class MainActivity extends ActionBarActivity {    private ListView listView;    private List<A> list;    private Adapter1 adapter1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initDate();        listView = (ListView)findViewById(R.id.list);        adapter1 = new Adapter1();        listView.setAdapter(adapter1);    }    /**     * 模拟40个数据，奇数数据为选中状态，偶数数据为非选中状态     */    private void initDate(){        list = new ArrayList<A>();        A a;        for(int i=0;i<40;i++){            a = new A(i+"号位",A.TYPE_NOCHECKED);            list.add(a);        }    }    class Adapter1 extends BaseAdapter {        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int position) {            return null;        }        @Override        public long getItemId(int position) {            return 0;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            final int index = position;            ViewHolder viewHolder;            if(convertView == null){                viewHolder = new ViewHolder();                convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.listitem, null);                viewHolder.layout = (LinearLayout)convertView.findViewById(R.id.layout);                viewHolder.textView = (TextView)convertView.findViewById(R.id.textview);                viewHolder.checkBox = (CheckBox)convertView.findViewById(R.id.checkbox);                convertView.setTag(viewHolder);            }else{                viewHolder = (ViewHolder)convertView.getTag();            }            viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {                @Override                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                    if(isChecked){                        list.get(index).type = A.TYPE_CHECKED;                    }else{                        list.get(index).type = A.TYPE_NOCHECKED;                    }                }            });            viewHolder.textView.setText(list.get(position).name);            if(list.get(position).type == A.TYPE_CHECKED){                viewHolder.checkBox.setChecked(true);            }else{                viewHolder.checkBox.setChecked(false);            }            return convertView;        }    }    class ViewHolder{        LinearLayout layout;        TextView textView;        CheckBox checkBox;    }    class A {        public static final int TYPE_CHECKED = 1;        public static final int TYPE_NOCHECKED = 0;        String name;        int type;        public A(String name,int type){            this.name = name;            this.type = type;        }    }}
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效果图： 
 
好，这里可以看到不会出现错位混乱的问题了，接下来修改之前那篇博客的代码，首先我们来按照上面的代码来修改：

public class MainActivity extends ActionBarActivity {    // 可滑动的显示选中用户的View    private LinearLayout menuLinerLayout;    private ListView listView;    private List<User> allUserList;    private EditText editText;    private TextView tv_checked;    private ImageView iv_search;    private ListAdapter adapter;    private List<String> addList = new ArrayList<String>();    private int total = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initData();    }    private void initData() {        User angelbaby = new User("0",R.mipmap.a1,0);        User tangyan = new User("1",R.mipmap.a2,0);        User zhaoliying = new User("2",R.mipmap.a3,0);        User gaoyuanyuan = new User("3",R.mipmap.a4,0);        User cat = new User("4",R.mipmap.a5,0);        User cat1 = new User("5",R.mipmap.a5,0);        User cat2 = new User("6",R.mipmap.a5,0);        User cat3 = new User("7",R.mipmap.a5,0);        User cat4 = new User("8",R.mipmap.a5,0);        User cat5 = new User("9",R.mipmap.a5,0);        User cat6 = new User("10",R.mipmap.a5,0);        User cat7 = new User("11",R.mipmap.a5,0);        User cat8 = new User("12",R.mipmap.a5,0);        User cat9 = new User("13",R.mipmap.a5,0);        User cat10 = new User("14",R.mipmap.a5,0);        User cat11 = new User("15",R.mipmap.a5,0);        User cat12 = new User("16",R.mipmap.a5,0);        allUserList = new ArrayList<User>();        allUserList.add(angelbaby);        allUserList.add(tangyan);        allUserList.add(zhaoliying);        allUserList.add(gaoyuanyuan);        allUserList.add(cat);        allUserList.add(cat1);        allUserList.add(cat2);        allUserList.add(cat3);        allUserList.add(cat4);        allUserList.add(cat5);        allUserList.add(cat6);        allUserList.add(cat7);        allUserList.add(cat8);        allUserList.add(cat9);        allUserList.add(cat10);        allUserList.add(cat11);        allUserList.add(cat12);        adapter = new ListAdapter(MainActivity.this,allUserList);        listView.setAdapter(adapter);        //搜索栏搜索        editText.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {                if (s.length() > 0) {                    String str_s = editText.getText().toString().trim();                    List<User> user_temp = new ArrayList<User>();                    for (User user : allUserList) {                        String uesrname = user.getName();                        if (uesrname.contains(str_s)) {                            user_temp.add(user);                        }                        adapter = new ListAdapter(MainActivity.this, user_temp);                        listView.setAdapter(adapter);                    }                } else {                    adapter = new ListAdapter(MainActivity.this, allUserList);                    listView.setAdapter(adapter);                }            }            @Override            public void afterTextChanged(Editable s) {            }        });        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(final AdapterView<?> parent, final View view,                                    final int position, long id) {                CheckBox checkBox = (CheckBox) view.findViewById(R.id.checkbox);                checkBox.toggle();            }        });    }    private void initView() {        listView = (ListView) findViewById(R.id.list);        menuLinerLayout = (LinearLayout) findViewById(R.id.linearLayoutMenu);        editText = (EditText) findViewById(R.id.et_search);        tv_checked = (TextView) findViewById(R.id.tv_checked);        iv_search = (ImageView) findViewById(R.id.iv_search);    }    //显示选择的头像    private void showCheckImage(Bitmap bitmap, User glufineid) {        total++;        // 包含TextView的LinearLayout        // 参数设置        android.widget.LinearLayout.LayoutParams menuLinerLayoutParames = new LinearLayout.LayoutParams(                75, 75, 1);        View view = LayoutInflater.from(this).inflate(                R.layout.header_item, null);        ImageView images = (ImageView) view.findViewById(R.id.iv_avatar);        menuLinerLayoutParames.setMargins(6, 6, 6, 6);        // 设置id，方便后面删除        view.setTag(glufineid);        if (bitmap == null) {            images.setImageResource(R.mipmap.default_useravatar);        } else {            images.setImageBitmap(bitmap);        }        menuLinerLayout.addView(view, menuLinerLayoutParames);        tv_checked.setText("确定(" + total + ")");        if (total > 0) {            if (iv_search.getVisibility() == View.VISIBLE) {                iv_search.setVisibility(View.GONE);            }        }        addList.add(glufineid.getName());    }    //删除选择的头像    private void deleteImage(User glufineid) {        View view = (View) menuLinerLayout.findViewWithTag(glufineid);        menuLinerLayout.removeView(view);        total--;        tv_checked.setText("确定(" + total + ")");        addList.remove(glufineid.getName());        if (total < 1) {            if (iv_search.getVisibility() == View.GONE) {                iv_search.setVisibility(View.VISIBLE);            }            tv_checked.setText("确定");        }    }    /**     * adapter     */    private class ListAdapter extends BaseAdapter {        private LayoutInflater layoutInflater;        private Context context;        private List<User> list = null;        public ListAdapter(Context context,List<User> list){            this.context = context;            this.list = list;        }        @Override        public int getCount() {            return this.list.size();        }        @Override        public User getItem(int position) {            return (User) list.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(final int position, View convertView, ViewGroup parent) {            final int index = position;            User user = getItem(position);             ViewHolder viewHolder = null;            if (convertView == null) {                viewHolder = new ViewHolder();                convertView = LayoutInflater.from(context).inflate(R.layout.listitem,null);                viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageview);                viewHolder.textView = (TextView) convertView.findViewById(R.id.textview);                viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkbox);                viewHolder.layout = (LinearLayout) convertView.findViewById(R.id.layout);                convertView.setTag(viewHolder);            }else {                viewHolder = (ViewHolder) convertView.getTag();            }            final ImageView imageView = (ImageView) convertView.findViewById(R.id.imageview);            viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {                @Override                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                    if (isChecked) {                        list.get(index).type = User.TYPE_CHECKED;                        Bitmap bitmap = null;                        bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();                        showCheckImage(bitmap, list.get(index));                    } else {                        list.get(index).type = User.TYPE_NOCHECKED;                        // 用户显示在滑动栏删除                        deleteImage(list.get(index));                    }                }            });            if(list.get(index).type == User.TYPE_CHECKED){                viewHolder.checkBox.setChecked(true);            }else{                viewHolder.checkBox.setChecked(false);            }            viewHolder.imageView.setImageResource(user.getHeader());            viewHolder.textView.setText(user.getName());            return convertView;        }    }    private class ViewHolder {        ImageView imageView;        TextView textView;        CheckBox checkBox;    }
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User类：

public class User {    public static final int TYPE_CHECKED = 1;    public static final int TYPE_NOCHECKED = 0;    public String name;    public int header;    public int type;    public User(String name, int header,int type) {        this.name = name;        this.header = header;        this.type = type;    }    public String getName() {        return name;    }    public int getHeader() {        return header;    }}
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好，先来看看效果 
 
这里很明显可以看到，虽然checkbox的点击不会混乱了，但在listview的滑动过程中，仍然会执行onCheckedChanged 方法，在搜索栏中仍会造成混乱，感觉这个归根结底还是在listview的滚动过程中，已点击的checkbox在滚出屏幕后，就类似于被点击了一下，isChecked就被设为了false，就执行了onCheckedChanged 方法。不知道我这说的明不明白，就是理解这一句

第一个view对象在第一屏的时候需要显示成”未选择”状态，而到了第二屏的时候，却要显示成”选择”状态，但由于是共用的同一个对象，根据第一点得知当checkBox的状态改变的时候,会调用onCheckedChanged()方法

所以这么修改还是有问题的，接下里我们接着修改，既然在滚动中会一直执行onCheckedChanged 方法，那么我们就干脆不写这个方法好了，简单干脆，使用setOnClickListener 来处理点击事件好了，那么代码：

public class MainActivity extends ActionBarActivity {    // 可滑动的显示选中用户的View    private LinearLayout menuLinerLayout;    private ListView listView;    private List<User> allUserList;    private EditText editText;    private TextView tv_checked;    private ImageView iv_search;    private ListAdapter adapter;    private List<String> addList = new ArrayList<String>();    private int total = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initData();    }    private void initData() {        User angelbaby = new User("0",R.mipmap.a1,0);        User tangyan = new User("1",R.mipmap.a2,0);        User zhaoliying = new User("2",R.mipmap.a3,0);        User gaoyuanyuan = new User("3",R.mipmap.a4,0);        User cat = new User("4",R.mipmap.a5,0);        User cat1 = new User("5",R.mipmap.a5,0);        User cat2 = new User("6",R.mipmap.a5,0);        User cat3 = new User("7",R.mipmap.a5,0);        User cat4 = new User("8",R.mipmap.a5,0);        User cat5 = new User("9",R.mipmap.a5,0);        User cat6 = new User("10",R.mipmap.a5,0);        User cat7 = new User("11",R.mipmap.a5,0);        User cat8 = new User("12",R.mipmap.a5,0);        User cat9 = new User("13",R.mipmap.a5,0);        User cat10 = new User("14",R.mipmap.a5,0);        User cat11 = new User("15",R.mipmap.a5,0);        User cat12 = new User("16",R.mipmap.a5,0);        allUserList = new ArrayList<User>();        allUserList.add(angelbaby);        allUserList.add(tangyan);        allUserList.add(zhaoliying);        allUserList.add(gaoyuanyuan);        allUserList.add(cat);        allUserList.add(cat1);        allUserList.add(cat2);        allUserList.add(cat3);        allUserList.add(cat4);        allUserList.add(cat5);        allUserList.add(cat6);        allUserList.add(cat7);        allUserList.add(cat8);        allUserList.add(cat9);        allUserList.add(cat10);        allUserList.add(cat11);        allUserList.add(cat12);        adapter = new ListAdapter(MainActivity.this,allUserList);        listView.setAdapter(adapter);        //搜索栏搜索        editText.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {                if (s.length() > 0) {                    String str_s = editText.getText().toString().trim();                    List<User> user_temp = new ArrayList<User>();                    for (User user : allUserList) {                        String uesrname = user.getName();                        if (uesrname.contains(str_s)) {                            user_temp.add(user);                        }                        adapter = new ListAdapter(MainActivity.this, user_temp);                        listView.setAdapter(adapter);                    }                } else {                    adapter = new ListAdapter(MainActivity.this, allUserList);                    listView.setAdapter(adapter);                }            }            @Override            public void afterTextChanged(Editable s) {            }        });    }    private void initView() {        listView = (ListView) findViewById(R.id.list);        menuLinerLayout = (LinearLayout) findViewById(R.id.linearLayoutMenu);        editText = (EditText) findViewById(R.id.et_search);        tv_checked = (TextView) findViewById(R.id.tv_checked);        iv_search = (ImageView) findViewById(R.id.iv_search);    }    //显示选择的头像    private void showCheckImage(Bitmap bitmap, User glufineid) {        total++;        // 包含TextView的LinearLayout        // 参数设置        android.widget.LinearLayout.LayoutParams menuLinerLayoutParames = new LinearLayout.LayoutParams(                75, 75, 1);        View view = LayoutInflater.from(this).inflate(                R.layout.header_item, null);        ImageView images = (ImageView) view.findViewById(R.id.iv_avatar);        menuLinerLayoutParames.setMargins(6, 6, 6, 6);        // 设置id，方便后面删除        view.setTag(glufineid);        if (bitmap == null) {            images.setImageResource(R.mipmap.default_useravatar);        } else {            images.setImageBitmap(bitmap);        }        menuLinerLayout.addView(view, menuLinerLayoutParames);        tv_checked.setText("确定(" + total + ")");        if (total > 0) {            if (iv_search.getVisibility() == View.VISIBLE) {                iv_search.setVisibility(View.GONE);            }        }        addList.add(glufineid.getName());    }    //删除选择的头像    private void deleteImage(User glufineid) {        View view = (View) menuLinerLayout.findViewWithTag(glufineid);        menuLinerLayout.removeView(view);        total--;        tv_checked.setText("确定(" + total + ")");        addList.remove(glufineid.getName());        if (total < 1) {            if (iv_search.getVisibility() == View.GONE) {                iv_search.setVisibility(View.VISIBLE);            }            tv_checked.setText("确定");        }    }    /**     * adapter     */    private class ListAdapter extends BaseAdapter {        private LayoutInflater layoutInflater;        private Context context;        private List<User> list = null;        public ListAdapter(Context context,List<User> list){            this.context = context;            this.list = list;        }        @Override        public int getCount() {            return this.list.size();        }        @Override        public User getItem(int position) {            return (User) list.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(final int position, View convertView, ViewGroup parent) {            final int index = position;            User user = getItem(position);             ViewHolder viewHolder = null;            if (convertView == null) {                viewHolder = new ViewHolder();                convertView = LayoutInflater.from(context).inflate(R.layout.listitem,null);                viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageview);                viewHolder.textView = (TextView) convertView.findViewById(R.id.textview);                viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkbox);                viewHolder.layout = (LinearLayout) convertView.findViewById(R.id.layout);                convertView.setTag(viewHolder);            }else {                viewHolder = (ViewHolder) convertView.getTag();            }            final ImageView imageView = (ImageView) convertView.findViewById(R.id.imageview);            viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    if (list.get(index).type == User.TYPE_CHECKED){                        list.get(index).type = User.TYPE_NOCHECKED;                        deleteImage(list.get(index));                    } else {                        (list.get(index)).type = User.TYPE_CHECKED;                        Bitmap bitmap = null;                        bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();                        showCheckImage(bitmap, list.get(index));                    }                }            });            final ViewHolder finalViewHolder = viewHolder;            viewHolder.layout.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    if (list.get(index).type == User.TYPE_CHECKED){                        list.get(index).type = User.TYPE_NOCHECKED;                        deleteImage(list.get(index));                        finalViewHolder.checkBox.setChecked(false);                    } else {                        (list.get(index)).type = User.TYPE_CHECKED;                        Bitmap bitmap = null;                        bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();                        showCheckImage(bitmap, list.get(index));                        finalViewHolder.checkBox.setChecked(true);                    }                }            });            if(list.get(index).type == User.TYPE_CHECKED){                viewHolder.checkBox.setChecked(true);            }else{                viewHolder.checkBox.setChecked(false);            }            viewHolder.imageView.setImageResource(user.getHeader());            viewHolder.textView.setText(user.getName());            return convertView;        }    }    private class ViewHolder {        ImageView imageView;        TextView textView;        CheckBox checkBox;        LinearLayout layout;    }}
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效果图： 

可算是把这个问题解决了，但我总觉得这个好像弄的很复杂的样子，有没有更简单的实现方案呢，微信的那个加群的界面是这么实现的么，如果各位看了后有什么好的点子，可以联系我。

源码：http://download.csdn.net/detail/jiang89125/9372097

转载请注明出处：http://blog.csdn.net/jiang89125/article/details/50379364