当我在 Android 上滚动列表视图时未选中复选框 [英] Checkbox unchecked when I scroll listview on Android
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问题描述
我是 Android 开发的新手.我用 textbox 和 checkbox 创建了一个 listview.
I am new to Android development. I created a listview with a textbox and checkbox.
当我选中 checkbox 并向下滚动以检查列表视图中的其他一些项目时，较旧的项目未选中.
When I check the checkbox and scroll it down to check some other items in the list view, the older ones are unchecked.
如何在 listview 中避免这个问题?请用我的代码指导我.
How do I avoid this problem in a listview? Please guide me with my code.
代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/TextView01"
android:layout_height="wrap_content"
android:text="List of items"
android:textStyle="normal|bold"
android:gravity="center_vertical|center_horizontal"
android:layout_width="fill_parent"/>
<ListView
android:id="@+id/ListView01"
android:layout_height="250px"
android:layout_width="fill_parent"/>
<Button
android:text="Save"
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
这是我用来创建动态列表行的 XML 页面:
This is the XML page I used to create dynamic list row:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:gravity="left|center"
android:layout_width="wrap_content"
android:paddingBottom="5px"
android:paddingTop="5px"
android:paddingLeft="5px">
<TextView
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#FFFF00"
android:text="hi"/>
<TextView
android:text="hello"
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10px"
android:textColor="#0099CC"/>
<EditText
android:id="@+id/txtbox"
android:layout_width="120px"
android:layout_height="wrap_content"
android:textSize="12sp"
android:layout_x="211px"
android:layout_y="13px"/>
<CheckBox
android:id="@+id/chkbox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
这是我的活动课.
This is my activity class.
public class CustomListViewActivity extends Activity {
ListView lstView;
static Context mContext;
Button btnSave;
private static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return country.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.listview, parent,
false);
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.TextView01);
holder.text2 = (TextView) convertView
.findViewById(R.id.TextView02);
holder.txt = (EditText) convertView.findViewById(R.id.txtbox);
holder.cbox = (CheckBox) convertView.findViewById(R.id.chkbox1);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(curr[position]);
holder.text2.setText(country[position]);
holder.txt.setText("");
holder.cbox.setChecked(false);
return convertView;
}
public class ViewHolder {
TextView text;
TextView text2;
EditText txt;
CheckBox cbox;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lstView = (ListView) findViewById(R.id.ListView01);
lstView.setAdapter(new EfficientAdapter(this));
btnSave = (Button)findViewById(R.id.btnSave);
mContext = this;
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// I want to print the text which is in the listview one by one.
// Later I will insert it in the database.
//
// Toast.makeText(getBaseContext(), "EditText Value, checkbox value and other values", Toast.LENGTH_SHORT).show();
for (int i = 0; i < lstView.getCount(); i++) {
View listOrderView;
listOrderView = lstView.getChildAt(i);
try{
EditText txtAmt = (EditText)listOrderView.findViewById(R.id.txtbox);
CheckBox cbValue = (CheckBox)listOrderView.findViewById(R.id.chkbox1);
if(cbValue.isChecked()== true){
String amt = txtAmt.getText().toString();
Toast.makeText(getBaseContext(), "Amount is :"+amt, Toast.LENGTH_SHORT).show();
}
}
catch (Exception e) {
// TODO: handle exception
}
}
}
});
}
private static final String[] country = { "item1", "item2", "item3",
"item4", "item5", "item6","item7", "item8", "item9",
"item10", "item11", "item12" };
private static final String[] curr = { "1", "2", "3", "4", "5", "6","7", "8", "9", "10", "11", "12" };
}
请帮我解决这个问题.
我在很多地方都提到过这个问题.但我无法得到正确答案来解决这个问题.
I have referred to this problem in many places. But I could not get proper answer to solve this problem.
请提供代码以避免在上下滚动时取消选中复选框.
Please provide me the code to avoid unchecking the checkbox while scrolling up and down.
推荐答案
在自定义列表视图适配器中调用 setChecked after 调用 setOnCheckedChangeListener.
In the custom listview adapter call setChecked after calling setOnCheckedChangeListener.
通过这种方式，您可以从回收的视图中切断到旧侦听器的链接.
This way you sever the link to the old listener from the recycled view.
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