如何使用BaseAdapter？ [英] How to use BaseAdapter?
问题描述
我使用的适配器来查看添加到会话，但问题的文件列表，当我想用一个newsession的（重启活动）用文件的新名单，我的适配器视图中的所有最近的项目，因此，我想我的自由适配器之前打印的清单。我的适配器是由code以下以及在何处使用它的片段给出。我尝试了所有的给定的命题，但我有一些问题。如在我使用的第一文件，则第一个如下所示的两个图像我重新启动我用新文件的活动，但是我有第一和第二文件。因此，如何清除我的适配器。
I'm using an Adapter to view a list of files added to a session but the problem when I would like to use a newSession (restarts Activity) with a new list of files, my Adapter view all the recent items, So I Would like to free my adapter before to print the list. My adapter is given by the code below and the fragment where to use it. I tried All the given proposition but I have the some problem. As illustrated by the two images below in the first one I used a first file then I restarted my Activity with a new file but I have both the first and the second file. So how to clear my Adapter.
public class GridviewAdapter extends BaseAdapter
{
private ArrayList<String> listCountry;
private ArrayList<Integer> listFlag;
private Activity activity;
public GridviewAdapter(Activity activity, ArrayList<String> listCountry, ArrayList<Integer> listFlag) {
super();
this.listCountry = listCountry;
this.listFlag = listFlag;
this.activity = activity; }
@Override
public int getCount() {
// TODO Auto-generated method stub
return listCountry.size();
}
@Override
public String getItem(int position) {
// TODO Auto-generated method stub
return listCountry.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public static class ViewHolder
{
public ImageView imgViewFlag;
public TextView txtViewTitle;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder view;
LayoutInflater inflator = activity.getLayoutInflater();
if(convertView==null)
{
view = new ViewHolder();
convertView = inflator.inflate(R.layout.gridview_row, null);
view.txtViewTitle = (TextView) convertView.findViewById(R.id.textView1);
view.imgViewFlag = (ImageView) convertView.findViewById(R.id.imageView1);
convertView.setTag(view);
}
else
{
view = (ViewHolder) convertView.getTag();
}
view.txtViewTitle.setText(listCountry.get(position));
view.imgViewFlag.setImageResource(listFlag.get(position));
return convertView;
}
}
在这里我使用myAdapter片段：
the fragment where i'm using myAdapter:
public class MatFragment extends Fragment {
private GridViewAjoutFile adapter;
private GridViewAjoutFile ajout = new GridViewAjoutFile();
public static boolean continuer = false;
private GridviewAdapter mAdapter;
private ArrayList<String> listCountry;
private ArrayList<Integer> listFlag;
private ArrayList<String> intentType;
private GridView gridView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(!(mAdapter.isEmpty())){
listCountry.clear();
listFlag.clear();
mAdapter.notifyDataSetChanged();
}
prepareList();
// prepared arraylist and passed it to the Adapter class
mAdapter = new GridviewAdapter(getActivity(),listCountry, listFlag);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final ArrayList<String> profilTabShortCut;
View view = inflater.inflate(R.layout.maindoc,
container, false);
// Set custom adapter to gridview
mAdapter.notifyDataSetChanged();
gridView = (GridView) view.findViewById(R.id.gridView1);
gridView.setAdapter(mAdapter);
// Implement On Item click listener
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
Intent intent1 = new Intent();
intent1.setAction(android.content.Intent.ACTION_VIEW);
intent1.setType("application/pdf") ;
intent1.setData(Uri.parse(url));
startActivity(Intent.createChooser(intent1,
"Ouvrir le fichier avec")); */
SetIntentType(SessionChoose.listofUrl.get(position),intentType.get(position));
}
});
return view;
}
public Intent SetIntentType(String url, String intenttype ){
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setType(intenttype) ;
intent.setData(Uri.parse(url));
startActivity(Intent.createChooser(intent,
"Ouvrir le fichier avec"));
return null;
}
public void prepareList()
{
listCountry = new ArrayList<String>();
listFlag = new ArrayList<Integer>();
intentType = new ArrayList<String>();
if(SessionChoose.listofDoc.size()>0){
for(int i = 0; i< SessionChoose.listofDoc.size() ; i++){
listCountry.add(SessionChoose.listofDoc.get(i));
if((SessionChoose.listoftype).get(i).contains("pdf")){
listFlag.add(R.drawable.pdf);
intentType.add("application/pdf");
} else if(((SessionChoose.listoftype).get(i).contains("png"))||((SessionChoose.listoftype).get(i).contains("bitmap")) || ((SessionChoose.listoftype).get(i).contains("jpg")) || ((SessionChoose.listoftype).get(i).contains("jpeg"))){
Log.d("*/*/*/*/DoCFragment*/*/*/*", SessionChoose.listoftype.get(i));
listFlag.add(R.drawable.png);
intentType.add("application/pdf");
} else if((SessionChoose.listoftype).get(i).contains("txt")){
listFlag.add(R.drawable.txt);
intentType.add("application/pdf");
} else if ((SessionChoose.listoftype).get(i).contains("mp4")){
listFlag.add(R.drawable.video);
intentType.add("application/pdf");
} else{
listFlag.add(R.drawable.inconnu);
intentType.add("application/pdf");
}
}
}
}
}
推荐答案
你有没有考虑，你可以在你的 SessionChoose.listOfDoc有两个文件？
显然你的code清除BaseAdapter是没有错的。
我用来创建我称之为一种方法的addAll（）在我的适配器，如：
Have you considered that you could have both files in your SessionChoose.listOfDoc ?
Apparently your code to clear the BaseAdapter is not wrong.
I use to create a method which I call addAll() in my Adapter, like this:
public void addAll(List<String> list) {
//mList is the List of the adapter;
mList.clear();
mList.addAll(list);
notifyDatasetChanged();
}
这样，当我想清楚适配器，我只是叫 mAdapter.addAll（新的ArrayList＆LT;串GT;）;
这篇关于如何使用BaseAdapter？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IT屋！
