问题描述
我不能找到一种方法使用游标适配器时保存复选框状态。其他一切工作正常，但如果我点击复选框是重复其回收时。我见过使用数组适配器的例子，但因为我缺乏经验的IM发现很难把它翻译成使用游标适配器。可能有人给我如何去做一个例子。任何帮助AP preciated。
私有类PostImageAdapter扩展的CursorAdapter {
私有静态最终诠释S = 0;
私人诠释布局;
位图BM = NULL;
私人字符串PostNumber;
TourDbAdapter mDbHelper;
公共PostImageAdapter（上下文的背景下，INT布局，光标C，的String []从，INT []键，字符串postid）{
超（背景下，C）;
this.layout =布局;
PostNumber = Postid;
mDbHelper =新TourDbAdapter（上下文）;
mDbHelper.open（）;
}
@覆盖
公共查看NewView的（上下文的背景下，最终的光标C，父母的ViewGroup）{
ViewHolder持有人;
LayoutInflater充气= getLayoutInflater（）;
查看排= inflater.inflate（R.layout.image_post_row，NULL）;
持有人=新ViewHolder（）;
holder.Description =（TextView中）row.findViewById（R.id.item_desc）;
holder.cb =（复选框）row.findViewById（R.id.item_checkbox）;
holder.DateTaken =（TextView中）row.findViewById（R.id.item_date_taken）;
holder.Photo =（ImageView的）row.findViewById（R.id.item_thumb）;
row.setTag（保持器）;
INT DateCol = c.getColumnIndex（TourDbAdapter.KEY_DATE）;
字符串日期= c.getString（DateCol）;
INT DescCol = c.getColumnIndex（TourDbAdapter.KEY_CAPTION）;
字符串描述= c.getString（DescCol）;
INT FileNameCol = c.getColumnIndex（TourDbAdapter.KEY_FILENAME）;
最后字符串文件名= c.getString（FileNameCol）;
INT PostRowCol = c.getColumnIndex（TourDbAdapter.KEY_Post_ID）;
字符串的RowID = c.getString（PostRowCol）;
字符串路径=SD卡/ Tourabout /大拇指/+文件名+.JPG;
位图BM = BitmapFactory.de codeFILE（路径，NULL）;
holder.Photo.setImageBitmap（BM）;
holder.DateTaken.setText（日期）;
holder.Description.setText（说明）;
holder.cb.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
复选框的CBox =（复选框）V;
如果（cBox.isChecked（））{
mDbHelper.UpdatePostImage（文件名，PostNumber）;
}
否则如果（！cBox.isChecked（））{
mDbHelper.UpdatePostImage（文件名，）;
}
}
}）;
返回行;
};
@覆盖
公共无效bindView（查看行，上下文的背景下，最终的光标C）{
ViewHolder持有人;
支架=（ViewHolder）row.getTag（）;
INT DateCol = c.getColumnIndex（TourDbAdapter.KEY_DATE）;
字符串日期= c.getString（DateCol）;
INT DescCol = c.getColumnIndex（TourDbAdapter.KEY_CAPTION）;
字符串描述= c.getString（DescCol）;
INT FileNameCol = c.getColumnIndex（TourDbAdapter.KEY_FILENAME）;
最后字符串文件名= c.getString（FileNameCol）;
INT PostRowCol = c.getColumnIndex（TourDbAdapter.KEY_Post_ID）;
字符串的RowID = c.getString（PostRowCol）;
字符串路径=SD卡/ Tourabout /大拇指/+文件名+.JPG;
位图BM = BitmapFactory.de codeFILE（路径，NULL）;
文件X = NULL;
holder.Photo.setImageBitmap（BM）;
holder.DateTaken.setText（日期）;
holder.Description.setText（说明）;
holder.cb.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
复选框的CBox =（复选框）V;
如果（cBox.isChecked（））{
mDbHelper.UpdatePostImage（文件名，PostNumber）;
}
否则如果（！cBox.isChecked（））{
mDbHelper.UpdatePostImage（文件名，）;
}
}
}）;
}
}
静态类ViewHolder {
TextView的说明;
ImageView的照片;
复选框CB;
TextView的DateTaken;
}
}
我会建议你使用Android的内置的多项选择列表的支持（ CHOICE_MODE_MULTIPLE ）。
的<$c$c>List11.java SDK示例演示了这一点。您也可以找到我的教程一个使用项目它这里。
您仍可以使用此技术与自己的布局，只要你有一个 CheckedTextView 与机器人：ID =@机器人：ID / text1中的如图所示 android.R.layout.simple_list_item_multiple_choice 资源中，它随你的SDK，副本
此外，请参阅this问题和这个问题和this问题和这个问题。
I cant find a way to save the checkbox state when using a Cursor adapter. Everything else works fine but if i click on a checkbox it is repeated when it is recycled. Ive seen examples using array adapters but because of my lack of experience im finding it hard to translate it into using a cursor adapter. Could someone give me an example of how to go about it. Any help appreciated.
private class PostImageAdapter extends CursorAdapter {
private static final int s = 0;
private int layout;
Bitmap bm=null;
private String PostNumber;
TourDbAdapter mDbHelper;
public PostImageAdapter (Context context, int layout, Cursor c, String[] from, int[] to, String Postid) {
super(context, c);
this.layout = layout;
PostNumber = Postid;
mDbHelper = new TourDbAdapter(context);
mDbHelper.open();
}
@Override
public View newView(Context context, final Cursor c, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater=getLayoutInflater();
View row=inflater.inflate(R.layout.image_post_row, null);
holder = new ViewHolder();
holder.Description = (TextView) row.findViewById(R.id.item_desc);
holder.cb = (CheckBox) row.findViewById(R.id.item_checkbox);
holder.DateTaken = (TextView) row.findViewById(R.id.item_date_taken);
holder.Photo = (ImageView) row.findViewById(R.id.item_thumb);
row.setTag(holder);
int DateCol = c.getColumnIndex(TourDbAdapter.KEY_DATE);
String Date = c.getString(DateCol);
int DescCol = c.getColumnIndex(TourDbAdapter.KEY_CAPTION);
String Description = c.getString(DescCol);
int FileNameCol = c.getColumnIndex(TourDbAdapter.KEY_FILENAME);
final String FileName = c.getString(FileNameCol);
int PostRowCol = c.getColumnIndex(TourDbAdapter.KEY_Post_ID);
String RowID = c.getString(PostRowCol);
String Path = "sdcard/Tourabout/Thumbs/" + FileName + ".jpg";
Bitmap bm = BitmapFactory.decodeFile(Path, null);
holder.Photo.setImageBitmap(bm);
holder.DateTaken.setText(Date);
holder.Description.setText(Description);
holder.cb.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
CheckBox cBox = (CheckBox) v;
if (cBox.isChecked()) {
mDbHelper.UpdatePostImage(FileName, PostNumber);
}
else if (!cBox.isChecked()) {
mDbHelper.UpdatePostImage(FileName, "");
}
}
});
return row;
};
@Override
public void bindView(View row, Context context, final Cursor c) {
ViewHolder holder;
holder = (ViewHolder) row.getTag();
int DateCol = c.getColumnIndex(TourDbAdapter.KEY_DATE);
String Date = c.getString(DateCol);
int DescCol = c.getColumnIndex(TourDbAdapter.KEY_CAPTION);
String Description = c.getString(DescCol);
int FileNameCol = c.getColumnIndex(TourDbAdapter.KEY_FILENAME);
final String FileName = c.getString(FileNameCol);
int PostRowCol = c.getColumnIndex(TourDbAdapter.KEY_Post_ID);
String RowID = c.getString(PostRowCol);
String Path = "sdcard/Tourabout/Thumbs/" + FileName + ".jpg";
Bitmap bm = BitmapFactory.decodeFile(Path, null);
File x = null;
holder.Photo.setImageBitmap(bm);
holder.DateTaken.setText(Date);
holder.Description.setText(Description);
holder.cb.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
CheckBox cBox = (CheckBox) v;
if (cBox.isChecked()) {
mDbHelper.UpdatePostImage(FileName, PostNumber);
}
else if (!cBox.isChecked()) {
mDbHelper.UpdatePostImage(FileName, "");
}
}
});
}
}
static class ViewHolder{
TextView Description;
ImageView Photo;
CheckBox cb;
TextView DateTaken;
}
}
I would recommend you use Android's built-in support for multiple-choice lists (CHOICE_MODE_MULTIPLE).
The List11.java SDK sample demonstrates this. You can also find a project from one of my tutorials that uses it here.
You can still use this technique with your own layout, so long as you include a CheckedTextView with android:id="@android:id/text1" as shown in the android.R.layout.simple_list_item_multiple_choice resource, a copy of which ships with your SDK.
Also, see this question and this question and this question and this question.
这篇关于保存的Android国家复选框的ListView中使用光标适配器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！