[英]ListView with Checkboxes, issues with scrolling
我已经研究了针对此问题的其他几种解决方案,但是似乎它们都根本不同,因此似乎没有一个对我有用。 我的适配器中有PackageInfo类,该类负责列出设备上安装的应用程序。 那部分起作用。 每个应用程序旁边都有两个复选框,可将该应用程序分类为类别1或2。我将用户的选择存储在SharedPreference中(也可能会提供有关存储所有用户输入的更好方法的反馈,但这很有帮助,但这不是我的主要关注点)。
我已经研究了其他几种解决方案,但是我认为这里根本上缺少一些东西,问题是用户滚动时,复选框是否被随机选中或未选中。
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_layout, null);
holder = new ViewHolder();
holder.apkName = (TextView) convertView.findViewById(R.id.appname);
holder.category1 = (CheckBox) convertView.findViewById(R.id.arcade);
holder.category1.setTag(position);
holder.category2 = (CheckBox) convertView.findViewById(R.id.educational);
holder.category2.setTag(position);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
PackageInfo packageInfo = (PackageInfo) getItem(position);
Drawable appIcon = packageManager.getApplicationIcon(packageInfo.applicationInfo);
final String appName = packageManager.getApplicationLabel(packageInfo.applicationInfo).toString();
final String appPositionArcade = "cat1"+appName;
final String appPositionEdu = "cat2"+appName;
appIcon.setBounds(0, 0, 55, 55);
holder.apkName.setCompoundDrawables(appIcon, null, null, null);
holder.apkName.setCompoundDrawablePadding(15);
holder.apkName.setText(appName);
holder.category1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (holder.category1.isChecked()) {
holder.category2.setChecked(false);
SharedPreferences stored = context.getSharedPreferences("Shared Preferences", 0);
SharedPreferences.Editor editor = stored.edit();
editor.putBoolean(appPositionArcade, true);
editor.putBoolean(appPositionEdu, false);
} else if (!holder.category1.isChecked()) {
SharedPreferences stored = context.getSharedPreferences("Shared Preferences", 0);
SharedPreferences.Editor editor = stored.edit();
editor.putBoolean(appPositionArcade, false);
}
}
});
holder.category2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (holder.category2.isChecked()) {
SharedPreferences stored = context.getSharedPreferences("Shared Preferences", 0);
SharedPreferences.Editor editor = stored.edit();
holder.category1.setChecked(false);
editor.putBoolean(appPositionArcade, false);
editor.putBoolean(appPositionEdu, true);
} else if (!holder.category2.isChecked()) {
SharedPreferences stored = context.getSharedPreferences("Shared Preferences", 0);
SharedPreferences.Editor editor = stored.edit();
editor.putBoolean(appPositionEdu, false);
}
}
});
return convertView;
}
您可能会遇到视图重新整理问题。 您需要显式设置holder.category1和holder.category2的状态。
因为发生的事情是视图被回收时,并且您偶然从触发您的onclicklistener的另一行数据中获取了布尔值。
尝试移动convertView.setTag(holder);
return convertView;
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