我有麻烦,使多个删除工作在Android的ListView。从自定义适配器中删除项目android
1)我创建了一个CustomAdapter定制有几个按钮和文本每行(我把这里只是我认为最重要的):
public class PlayableCustomAdapter extends ArrayAdapter<String> {
private final boolean[] checkedItems;
private final LayoutInflater mInflater;
private final ActivityCallback activityCallback;
public PlayableCustomAdapter(Context context, ActivityCallback activityCallback,
List<String> files) {
super(context, NO_SELECTION);
this.activityCallback = activityCallback;
this.mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.checkedItems = new boolean[files.size()];
addAll(files);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View row = convertView;
Holder holder;
if (row == null) {
row = mInflater.inflate(R.layout.list_view_row_song, null);
holder = new Holder();
holder.text = (TextView) row.findViewById(R.id.tvFileName);
holder.configs = (TextView) row.findViewById(R.id.tvFileConfiguration);
holder.checkBox = (CheckBox) row.findViewById(R.id.cbDelete);
holder.playButton = (ImageButton) row.findViewById(R.id.btnPlay);
holder.settingsButton = (ImageButton) row.findViewById(R.id.btnSettings);
holder.text.setText(getItem(position));
holder.configs.setText(getLyricConfiguration(getItem(position)));
row.setTag(holder);
} else {
holder = (Holder) convertView.getTag();
}
holder.playButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startPrompter(position);
}
});
holder.settingsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startSettings(position);
}
});
holder.text.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startEditFile(position);
}
});
holder.checkBox.setChecked(checkedItems[position]);
holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
checkedItems[position] = true;
activityCallback.showContent();
} else {
verifySelectedItems(position);
}
}
});
return row;
}
private void verifySelectedItems(int position) {
checkedItems[position] = false;
for (boolean checked : checkedItems) {
if (checked)
return;
}
activityCallback.hideContent();
}
public boolean isChecked(int position) {
return checkedItems[position];
}
@Override
public void remove(String s) {
verifySelectedItems(getPosition(s));
super.remove(s);
notifyDataSetChanged();
}
static class Holder {
TextView text;
TextView configs;
ImageButton playButton;
CheckBox checkBox;
ImageButton settingsButton;
}
2)我用这个适配器在一个Activity中,一切都像一个魅力一样,除了多次删除。只有当我清除所有适配器项目时,listview才能正确更新。 当我删除一个或多个项目时,适配器似乎没问题。所有职位都正确传递。但我不知道如何,只有列表末尾的项目从视图中删除。
3)如您所见,我在删除后使用notifyDataSetChanged();
,问题仍然存在。我可以使其工作的唯一(也是可能)解决方案是在删除后重新创建活动(recreate();
)。屏幕闪烁,其可怕,但它功能齐全。而现在我有一些空闲时间,我正在问你们一些帮助。
下面是一个使用适配器的活动代码:
private void deleteFilesFromDisk(List<Integer> positionsToDelete, ArrayAdapter adapter) {
File[] files = getAppFiles();
for (int position : positionsToDelete) {
if (files[position].delete()) {
adapter.remove(fileNames.get(position));
} else
showMessage(R.string.delete_file_error, fileNames.get(position));
}
recreate(); // Horrible workaround, but it works!
}
请记住,这个方法仅仅是一个例子。特别是最后一行。没有娱乐命令,只有列表末尾的项目被移除(至少在UI中以可视方式)。
任何消耗?
adapter.notifydatasetchanged()?当您调用adapter.remove(fileNames.get(position))而不是继承的方法 – BIW
您不需要从适配器中删除项目,从列表中删除项目并通知适配器数据集已更改 –