【发布时间】：2012-06-09 09:06:39
【问题描述】：
我是 Android 开发新手。我用textbox 和checkbox 创建了一个listview。
当我检查checkbox 并向下滚动以检查列表视图中的其他一些项目时，较旧的项目未被选中。
如何在listview 中避免这个问题？请用我的代码指导我。
代码如下：
main.xml:
<?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：
listview.xml：
<?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。
CustomListViewActivity.java:
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。但是我无法得到正确的答案来解决这个问题。
请提供代码以避免在上下滚动时取消选中复选框。
【问题讨论】：
标签： android listview checkbox scroll