Question

我无法搞清楚这个。

我有一个带有CursorAdapter的ListView，如果项目偏离屏幕，那么开关会自动重置。我在交换机上设置了一个监听器onCheckedChangeListener，它触发了托管片段实现的监听器，该片段更新数据库表中的字段并重新查询整个事物（contentResolver.notifyChange（））。

我知道这是复选框的常见问题，但我仍然无法使其正常工作。

public class FilterCursorAdapter extends CursorAdapter {

    public interface OnSwitchToggledListener {
        public void onSwitchToggled(int id, boolean isActivated);
    }

    private OnSwitchToggledListener listener;

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        View view = layoutInflater.inflate(R.layout.filter_item, parent, false);

        ViewHolder holder = new ViewHolder();
        holder.keywordTextView = (TextView) view.findViewById(R.id.keyword_text_view);
        holder.cathegoryTextView = (TextView) view.findViewById(R.id.cathegory_text_view);
        holder.activateSwitch = (Switch) view.findViewById(R.id.switch_activate);
        view.setTag(holder);

        return view;

    }


    public void bindView(View row, final Context context, final Cursor cursor) {
        final ViewHolder holder = (ViewHolder) row.getTag();

        holder.keywordTextView.setText(cursor.getString(cursor.getColumnIndex(ArticleProvider.COLUMN_KEYOWRD)));

        final int id = cursor.getInt(cursor.getColumnIndex(ArticleProvider.COLUMN_FILTER_ID));
        String cathegory = cursor.getString(cursor.getColumnIndex(ArticleProvider.COLUMN_CATHEGORY));
        int isActivated = cursor.getInt(cursor.getColumnIndex(ArticleProvider.COLUMN_ACTIVATED));

        holder.cathegoryTextView.setText(string);
        holder.activateSwitch.setChecked(isActivated == 1);
        holder.activateSwitch.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    listener.onSwitchToggled(id, isChecked);
                }

        });
    }

     private class ViewHolder {

        public TextView keywordTextView;
        public TextView cathegoryTextView;
        public Switch activateSwitch;

    }

}

public class FilterListFragment extends SherlockListFragment implements LoaderCallbacks<Cursor>, OnSwitchToggledListener {

    @Override
    public void onSwitchToggled(int id, boolean isActivated) {
        Log.d(MainActivity.TAG, "ID: " + id + " isActivated: " + isActivated);

        ContentValues values = new ContentValues();
        values.put(ArticleProvider.COLUMN_ACTIVATED, isActivated);
        resolver.update(ArticleProvider.FILTERS_URI, values, ArticleProvider.COLUMN_FILTER_ID + "=" + id, null);

    }
}

从日志中可以看出，bindView中的setOnCheckedChangeListener侦听器会自动触发。

如何修复此问题？另外我想说明我正在使用SwitchCompatLibrary（https://github.com/ankri/SwitchCompatLibrary）

谢谢！

Answer 1

如果您遇到此问题，则需要在再次设置之前添加删除侦听器

holder.activateSwitch.setOnCheckedChangeListener(null)

Answer 2

今天我遇到同样的问题大约三个小时。一旦它离开屏幕，它就改变了。所以，我最终放弃了onCheckedChanged听众，而是使用了：

mySwitch.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
       Log.i(TAG, "isChecked:");
    }
});

现在它完美无缺。

当ListView - CursorAdapter离开屏幕时，Switch会自动切换

2 个答案: