强制列表视图不重用的意见(复选框) [英] Force Listview not to reuse views (Checkbox)
问题描述
我做了一个自定义的列表视图
(不覆盖 getView()
法)中有一个列表视图每个项目以下布局
contactlayout.xml
<?XML版本=1.0编码=UTF-8&GT?;
<的LinearLayout
的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:方向=横向
机器人:layout_width =match_parent
机器人:layout_height =match_parent机器人:weightSum =1>
<复选框机器人:ID =@ + ID / checkBox1机器人:文本=复选框的android:layout_width =134dp机器人:layout_height =108dp机器人:可聚焦=假>< /复选框>
<的LinearLayout机器人:ID =@ + ID / linearLayout1机器人:layout_height =match_parent机器人:方向=垂直的android:layout_width =87dp机器人:layout_weight =0.84机器人:weightSum =1&GT ;
<的TextView的android:文本=TextView的机器人:layout_height =WRAP_CONTENT的android:layout_width =match_parent机器人:ID =@ + ID /名称机器人:layout_weight =0.03>< / TextView的>
<的TextView的android:文本=TextView的机器人:layout_width =match_parent机器人:layout_height =WRAP_CONTENT机器人:ID =@ + ID /电话>< / TextView的>
<的TextView的android:文本=TextView的机器人:layout_height =WRAP_CONTENT机器人:layout_weight =0.03的android:layout_width =match_parent机器人:ID =@ + ID /的ContactID机器人:知名度=隐形&GT ;< / TextView的>
< / LinearLayout中>
< / LinearLayout中>
我填充列表视图
使用 SimpleCursorAdapter
以下列方式...
光标C = getContentResolver()查询(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,NULL,NULL,NULL,ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)。 从[]字符串=新String[]{ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone.NUMBER,ContactsContract.CommonDataKinds.Phone.CONTACT_ID};
诠释为[] =新INT [] {R.id.name,R.id.phone,R.id.contactid};
SimpleCursorAdapter S =新SimpleCursorAdapter(这一点,R.layout.contactlayout,C,从,到);
lv.setAdapter(多个);
在点击按钮我读所有的复选框的状态。问题是,如果我选中一个复选框
其他几人的路线都会自动选中。我知道这是重用观。我该如何避免呢?我连覆盖在这种情况下 getView()
方法,所以我不知道是否还有什么办法达到我想要的?
答
最后我实现什么@sastraxi建议...
@覆盖
公共查看getView(INT位置,查看convertView,父母的ViewGroup){
查看查看= super.getView(位置,convertView,父母); 最后复选框复选框=(复选框)view.findViewById(R.id.checkBox1);
最终的TextView名=(的TextView)view.findViewById(R.id.name);
最终的TextView的ContactID =(TextView中)view.findViewById(R.id.contactid);
最终诠释POS =位置;
checkBox.setOnClickListener(新OnClickListener(){ @覆盖
公共无效的onClick(查看为arg0){
// TODO自动生成方法存根
如果(checkBox.isChecked())
{
checkList.add(将String.valueOf(POS));
nameList.add(name.getText()的toString());
contactList.add(contactId.getText()的toString());
Log.i(清洁香港加入,将String.valueOf(POS));
}
其他
{
checkList.remove(将String.valueOf(POS));
nameList.remove(name.getText()的toString());
contactList.remove(contactId.getText()的toString());
Log.i(联合国清洁香港删除,将String.valueOf(POS));
}
}
}); 如果(checkList.contains(将String.valueOf(POS)))
{
checkBox.setChecked(真);
}
其他
{
checkBox.setChecked(假);
} 返回视图。
}
啊,我看是什么问题。
请扩展的新类 SimpleCursorAdapter
,说 CheckboxSimpleCursorAdapter
,并覆盖 getView
这样:
公共查看getView(INT位置,查看convertView,父母的ViewGroup){
查看查看= super.getView(位置,convertView,父母);
复选框复选框=(复选框)view.findViewById(R.id.CheckBox1);
checkBox.setChecked(getIsThisListPositionChecked(位置));
返回视图。
}
如果你还没有使用布局的顶级查看
工具可勾选
,你所要做的一切你自己。这包括清除状态(这种情况下),由于使用的默认情况下再实施查看
被选中 - 正如你正确直觉
编辑:的使用这个新的code和实施保护布尔getIsThisListPositionChecked(INT位置)
返回与否的方法目前项目被选中(或类似的东西)。我希望我是再清楚不过 - 你需要弄清楚,如果该项目的应的根据进行检查的您的模型,然后设置,当你创建查看
。
I made a custom Listview
(Without overriding getView()
method) with each item in a Listview having a following Layout
contactlayout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent" android:weightSum="1">
<CheckBox android:id="@+id/checkBox1" android:text="CheckBox" android:layout_width="134dp" android:layout_height="108dp" android:focusable="false"></CheckBox>
<LinearLayout android:id="@+id/linearLayout1" android:layout_height="match_parent" android:orientation="vertical" android:layout_width="87dp" android:layout_weight="0.84" android:weightSum="1" >
<TextView android:text="TextView" android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/name" android:layout_weight="0.03"></TextView>
<TextView android:text="TextView" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/phone"></TextView>
<TextView android:text="TextView" android:layout_height="wrap_content" android:layout_weight="0.03" android:layout_width="match_parent" android:id="@+id/contactid" android:visibility="invisible"></TextView>
</LinearLayout>
</LinearLayout>
I am populating the Listview
using a SimpleCursorAdapter
in a following way...
Cursor c = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
String from[] = new String[]{ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone.NUMBER,ContactsContract.CommonDataKinds.Phone.CONTACT_ID};
int to[] = new int[]{R.id.name,R.id.phone,R.id.contactid};
SimpleCursorAdapter s = new SimpleCursorAdapter(this,R.layout.contactlayout,c,from,to);
lv.setAdapter(s);
On Click of a button I am reading the states of all the Checkboxes. The problem is, if I check one CheckBox
several others down the line get automatically Checked. I know this is reusing of Views. How do I avoid it ?. I am not even overriding getView()
method in this case, so I wonder if there is still any way to achieve what I want?
Answer
Finally I implemented what @sastraxi suggested...
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
final CheckBox checkBox = (CheckBox) view.findViewById(R.id.checkBox1);
final TextView name = (TextView) view.findViewById(R.id.name);
final TextView contactId = (TextView) view.findViewById(R.id.contactid);
final int pos = position;
checkBox.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(checkBox.isChecked())
{
checkList.add(String.valueOf(pos));
nameList.add(name.getText().toString());
contactList.add(contactId.getText().toString());
Log.i("Chk added",String.valueOf(pos));
}
else
{
checkList.remove(String.valueOf(pos));
nameList.remove(name.getText().toString());
contactList.remove(contactId.getText().toString());
Log.i("Un Chk removed",String.valueOf(pos));
}
}
});
if(checkList.contains(String.valueOf(pos)))
{
checkBox.setChecked(true);
}
else
{
checkBox.setChecked(false);
}
return view;
}
Ah, I see what the problem is.
Make a new class that extends SimpleCursorAdapter
, say CheckboxSimpleCursorAdapter
, and override getView
as such:
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
CheckBox checkBox = (CheckBox) view.findViewById(R.id.CheckBox1);
checkBox.setChecked(getIsThisListPositionChecked(position));
return view;
}
As you're not using a layout whose top-level View
implements Checkable
, you have to do everything yourself. That includes clearing state (in this case), as the default implementation re-used a View
that was checked--as you correctly intuited.
Edit: use this new code, and implement a protected boolean getIsThisListPositionChecked(int position)
method that returns whether or not the item is currently checked (or something like that). I hope I'm being clear enough--you need to figure out if the item should be checked according to your model, and then set that when you create the View
.
这篇关于强制列表视图不重用的意见(复选框)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!