[英]ListView with Checkboxes, issues with scrolling
我已經研究了針對此問題的其他幾種解決方案,但是似乎它們都根本不同,因此似乎沒有一個對我有用。 我的適配器中有PackageInfo類,該類負責列出設備上安裝的應用程序。 那部分起作用。 每個應用程序旁邊都有兩個復選框,可將該應用程序分類為類別1或2。我將用戶的選擇存儲在SharedPreference中(也可能會提供有關存儲所有用戶輸入的更好方法的反饋,但這很有幫助,但這不是我的主要關注點)。
我已經研究了其他幾種解決方案,但是我認為這里根本上缺少一些東西,問題是用戶滾動時,復選框是否被隨機選中或未選中。
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;
}
您可能會遇到視圖重新整理問題。 您需要顯式設置holder.category1和holder.category2的狀態。
因為發生的事情是視圖被回收時,並且您偶然從觸發您的onclicklistener的另一行數據中獲取了布爾值。
嘗試移動convertView.setTag(holder);
return convertView;
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