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【移动应用开发技术】RecyclerView中如何解决使用CheckBox出现勾选混乱的问题
/upload/information/20200623/125/124600.jpg<?xml
version="1.0"
encoding="utf-8"?>
<LinearLayout
xmlns:android="/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/id_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</LinearLayout><?xml
version="1.0"
encoding="utf-8"?>
<LinearLayout
xmlns:android="/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical">
<CheckBox
android:id="@+id/id_check_box"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="CheckBox"/>
</LinearLayout>public
class
MainActivity
extends
AppCompatActivity
{
private
RecyclerView
recyclerView;
private
MyAdapter
myAdapter;
@Override
protected
void
onCreate(Bundle
savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView
=
(RecyclerView)
findViewById(R.id.id_recycler_view);
myAdapter
=
new
MyAdapter();
recyclerView.setLayoutManager(new
LinearLayoutManager(this));
recyclerView.setAdapter(myAdapter);
}
private
class
MyAdapter
extends
RecyclerView.Adapter
{
private
List<String>
content;
@Override
public
RecyclerView.ViewHolder
onCreateViewHolder(ViewGroup
parent,
int
viewType)
{
View
view
=
LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recyclerview,
parent,
false);
return
new
MyViewHolder(view);
}
@Override
public
void
onBindViewHolder(RecyclerView.ViewHolder
holder,
int
position)
{
MyViewHolder
myViewHolder
=
(MyViewHolder)
holder;
myViewHolder.checkBox.setText(content.get(position));
}
@Override
public
int
getItemCount()
{
content
=
new
ArrayList<>();
for
(int
i
=
0;
i
<
100;
i++)
{
content.add("CheckBox"
+
i);
}
return
content.size();
}
}
private
class
MyViewHolder
extends
RecyclerView.ViewHolder
{
private
CheckBox
checkBox;
public
MyViewHolder(View
itemView)
{
super(itemView);
checkBox
=
(CheckBox)
itemView.findViewById(R.id.id_check_box);
}
}
}public
class
MainActivity
extends
AppCompatActivity
{
private
RecyclerView
recyclerView;
private
MyAdapter
myAdapter;
@Override
protected
void
onCreate(Bundle
savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView
=
(RecyclerView)
findViewById(R.id.id_recycler_view);
myAdapter
=
new
MyAdapter();
recyclerView.setLayoutManager(new
LinearLayoutManager(this));
recyclerView.setAdapter(myAdapter);
}
private
class
MyAdapter
extends
RecyclerView.Adapter
{
private
List<String>
content;
private
boolean[]
flag
=
new
boolean[100];//此处添加一个boolean类型的数组
@Override
public
RecyclerView.ViewHolder
onCreateViewHolder(ViewGroup
parent,
int
viewType)
{
View
view
=
LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recyclerview,
parent,
false);
return
new
MyViewHolder(view);
}
@Override
public
void
onBindViewHolder(RecyclerView.ViewHolder
holder,
final
int
position)
{
MyViewHolder
myViewHolder
=
(MyViewHolder)
holder;
myViewHolder.checkBox.setText(content.get(position));
myViewHolder.checkBox.setOnCheckedChangeListener(null);//先设置一次CheckBox的选中监听器，传入参数null
myViewHolder.checkBox.setChecked(flag[position]);//用数组中的值设置CheckBox的选中状态
//再设置一次CheckBox的选中监听器，当CheckBox的选中状态发生改变时，把改变后的状态储存在数组中
myViewHolder.checkBox.setOnCheckedChangeListener(new
CompoundButton.OnCheckedChangeListener()
{
@Override
public
void
onCheckedChanged(CompoundButton
compoundButton,
boolean
b)
{
flag[position]
=
b;
}
});
}
@Override
public
int
getItemCount()
{
content
=
new
ArrayList<>();
for
(int
i
=
0;
i
<
100;
i++)
{
content.add("CheckBox"
+
i);
}
return
content.size();
}
}
private
class
MyViewHolder
extends
RecyclerView.ViewHolder
{
private
CheckBox
checkBox;
public
MyViewHolder(View
itemView)
{
super(itemView);
checkBox
=
(CheckBox)
itemView.findViewById(R.id.id_check_box);
}
}
}<?xml
version="1.0"
encoding="utf-8"?>
<LinearLayout
xmlns:android="/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical">
<CheckBox
android:id="@+id/id_select_all"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="SelectAll"/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/id_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</LinearLayout>public
class
MainActivity
extends
AppCompatActivity
{
private
CheckBox
selectAll;
private
RecyclerView
recyclerView;
private
MyAdapter
myAdapter;
private
boolean
[]flag;//把flag数组定义为全局变量
@Override
protected
void
onCreate(Bundle
savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
selectAll
=
(CheckBox)
findViewById(R.id.id_select_all);
recyclerView
=
(RecyclerView)
findViewById(R.id.id_recycler_view);
flag
=
new
boolean[100];//初始化flag
myAdapter
=
new
MyAdapter();
recyclerView.setLayoutManager(new
LinearLayoutManager(this));
recyclerView.setAdapter(myAdapter);
//设置外面CheckBox的选中监听器，把它的选中状态赋值给其他的所有CheckBox,然后更新RecyclerView的Adapter
selectAll.setOnCheckedChangeListener(new
CompoundButton.OnCheckedChangeListener()
{
@Override
public
void
onCheckedChanged(CompoundButton
compoundButton,
boolean
b)
{
for
(int
i
=
0;
i
<
100;
i++)
{
flag[i]
=
b;
}
myAdapter.notifyDataSetChanged();
}
});
}
private
class
MyAdapter
extends
RecyclerView.Adapter
{
private
List<String>
content;
//
private
boolean[]
flag
=
new
boolean[100];
@Override
public
RecyclerView.ViewHolder
onCreateViewHolder(ViewGroup
parent,
int
viewType)
{
View
view
=
LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recyclerview,
parent,
false);
return
new
MyViewHolder(view);
}
@Override
public
void
onBindViewHolder(RecyclerView.ViewHolder
holder,
final
int
position)
{
MyViewHolder
myViewHolder
=
(MyViewHolder)
holder;
myViewHolder.checkBox.setText(content.get(position));
myViewHolder.checkBox.setOnCheckedChangeListener(null);
myViewHolder.checkBox.setChecked(flag[position]);
myViewHolder.checkBox.setOnCheckedChangeListener(new
CompoundButton.OnCheckedChangeListener()
{
@Override
public
void
onCheckedChanged(CompoundButton
compoundButton,
boolean
b)
{
flag[position]
=
b;
}
});
}
@Override
public
int
getItemCount()
{
content
=
new
ArrayList<>();
for
(int
i
=
0;
i
<
100;
i++)
{
content.add("CheckBox"
+
i);
}
return
content.size();
}
}
private
class
MyViewHolder
extends
RecyclerView.ViewHolder
{
private
CheckBox
checkBox;
public
MyViewHolder(View
itemView)
{
super(itemView);
checkBox
=
(CheckBox)
itemView.findViewById(R.id.id_check_box);
}
}
}<?xml
version="1.0"
encoding="utf-8"?>
<RelativeLayout
xmlns:android="/apk/res/android"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical">
<CheckBox
android:id="@+id/id_check_box"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="CheckBox"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:text="delete"/>
</RelativeLayout>private
class
MyAdapter
extends
RecyclerView.Adapter
{
//
private
List<String>
content;
//
private
boolean[]
flag
=
new
boolean[100];
@Override
public
RecyclerView.ViewHolder
onCreateViewHolder(ViewGroup
parent,
int
viewType)
{
View
view
=
LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recyclerview,
parent,
false);
return
new
MyViewHolder(view);
}
@Override
public
void
onBindViewHolder(RecyclerView.ViewHolder
holder,
final
int
position)
{
final
MyViewHolder
myViewHolder
=
(MyViewHolder)
holder;
myViewHolder.checkBox.setText(content.get(position));
myViewHolder.checkBox.setOnCheckedChangeListener(null);
myViewHolder.checkBox.setChecked(flag[position]);
myViewHolder.checkBox.setOnCheckedChangeListener(new
CompoundButton.OnCheckedChangeListener()
{
@Override
public
void
onCheckedChanged(CompoundButton
compoundButton,
boolean
b)
{
flag[position]
=
b;
}
});
//设置监听器，当按钮被点击是，删除它所在的item
myViewHolder.button.s
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