我有自定义数组适配器用于显示 ListView 的项目。我在 item_list.xml 文件中有两个 TextView 和一个复选框。我想从 ListView 中删除选中的项目。但问题是,当检查多个项目时,然后没有从位置正确删除。下面是我的源代码。
public class MainActivity extends Activity {
ListView listView;
Button btnDelete;
ArrayList<String> items = new ArrayList<String>();
ArrayList<String> ids = new ArrayList<String>();
CustomAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView1);
btnDelete = (Button) findViewById(R.id.btnDelete);
for (int i = 0; i < 20; i++) {
items.add("Chk " + i);
}
adapter = new CustomAdapter(MainActivity.this, R.layout.custome_list,
items);
listView.setAdapter(adapter);
btnDelete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (ids.size() > 0) {
for (int i = 0; i < ids.size(); i++) {
items.remove(ids.get(i));
// items.remove(items.get(adapter.getItemViewType(ids.get(i))));
// items.remove(adapter.getItemViewType(ids.get(i)));
}
adapter.notifyDataSetChanged();
}
}
});
}
public class CustomAdapter extends ArrayAdapter<String> {
List<String> items;
int resource;
public CustomAdapter(Context context, int resource, List<String> items) {
super(context, resource, items);
this.items = items;
this.resource = resource;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final int pos = position;
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = getLayoutInflater();
convertView = inflater.inflate(resource, null);
holder.chk = (CheckBox) convertView.findViewById(R.id.chk);
holder.txt = (TextView) convertView.findViewById(R.id.txt);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txt.setText(items.get(position));
// you have to reload the check states
holder.chk.setOnCheckedChangeListener(null);
holder.chk.setChecked(ids.contains(items.get(position)));
holder.chk
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
ids.add(items.get(position));
System.out.println("IDS A: " + ids.toString());
} else {
if (ids.contains(items.get(position))) {
//int i = ids.indexOf(position);
ids.remove(items.get(position));
System.out.println("IDS R: "
+ ids.toString());
}
}
}
});
return convertView;
}
}
public class ViewHolder {
CheckBox chk;
TextView txt;
}
}
最佳答案
按位置删除并不是一个好的解决方法。 您应该尝试通过对象删除。
这是示例代码
public class MainActivity extends Activity {
ListView listView;
Button btnDelete;
ArrayList<String> items = new ArrayList<String>();
ArrayList<String> ids = new ArrayList<String>();
CustomAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView1);
btnDelete = (Button) findViewById(R.id.btnDelete);
for (int i = 0; i < 20; i++) {
items.add("Chk " + i);
}
adapter = new CustomAdapter(MainActivity.this, R.layout.custome_list,
items);
listView.setAdapter(adapter);
btnDelete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (ids.size() > 0) {
for (int i = 0; i < ids.size(); i++) {
items.remove(ids.get(i));
// items.remove(items.get(adapter.getItemViewType(ids.get(i))));
// items.remove(adapter.getItemViewType(ids.get(i)));
}
adapter.notifyDataSetChanged();
}
}
});
}
public class CustomAdapter extends ArrayAdapter<String> {
List<String> items;
int resource;
public CustomAdapter(Context context, int resource, List<String> items) {
super(context, resource, items);
this.items = items;
this.resource = resource;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final int pos = position;
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = getLayoutInflater();
convertView = inflater.inflate(resource, null);
holder.chk = (CheckBox) convertView.findViewById(R.id.chk);
holder.txt = (TextView) convertView.findViewById(R.id.txt);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txt.setText(items.get(position));
// you have to reload the check states
holder.chk.setOnCheckedChangeListener(null);
holder.chk.setChecked(ids.contains(position));
holder.chk
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
ids.add(items.get(position));
System.out.println("IDS A: " + ids.toString());
} else {
if (ids.contains(items.get(position))) {
//int i = ids.indexOf(position);
ids.remove(items.get(position));
System.out.println("IDS R: "
+ ids.toString());
}
}
}
});
return convertView;
}
}
public class ViewHolder {
CheckBox chk;
TextView txt;
}
}
编辑
如果您在删除时遇到出站异常,您可以尝试使用此循环
for (String item : ids) {
items.remove(item);
}
关于android - 使用自定义数组适配器从 android ListView 中删除选中的多个项目的复选框,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29741602/