Question

嗨，我正在制作whatsapp清洁应用程序。这是我的适配器类

public class CustomAdapter extends BaseAdapter {
    Context c;
        ArrayList<Spacecraft> spacecrafts;

    public CustomAdapter(Context c, ArrayList<Spacecraft> spacecrafts) {
        this.c = c;
        this.spacecrafts = spacecrafts;
    }

    @Override
    public int getCount() {
        return spacecrafts.size();
    }

    @Override
    public Object getItem(int i) {
        return spacecrafts.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        View v=null;
        LayoutInflater inflater = (LayoutInflater)c
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if(view==null)
        {//INFLATE CUSTOM LAYOUT
          v = new View(c);
          v = inflater.inflate(R.layout.whatsimage, null);

            final Spacecraft s= (Spacecraft) this.getItem(i);
          TextView nameTxt= (TextView) v.findViewById(R.id.textView);
            ImageView img= (ImageView) v.findViewById(R.id.image);

            //BIND DATA
            nameTxt.setText(s.getName());
            Picasso.get().load(s.getUri()).into(img);
            //VIEW ITEM CLICK

        }

    else {
            v = (View) view;
        }

        return v;
    }

}

这是我的物品类别。

public class Spacecraft {

    String name;

    private Uri uri;;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Uri getUri() {
        return uri;
    }

    public void setUri(Uri uri) {
        this.uri = uri;
    }


}

我正在使用gv.Multiplechoice进行选择，但是当我单击项目时，项目不会突出显示。我想在单击时突出显示图像。我是android编程的新手，所以我不知道该如何实现？谁能帮助我，并提供更好的解决方案。

  gv.setAdapter(adapter);
       gv.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);
        gv.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
    @Override
    public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
      count=count+1;
      mode.setTitle(count+" Deleted Items");
        list_items.add(list.get(position));
    }

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        MenuInflater inflater=mode.getMenuInflater();
        inflater.inflate(R.menu.menu_main,menu);
return true;
    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false;
    }

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_open:

       int i;
                for ( i= 0; i < list_items.size(); ++i) {
                    Spacecraft s1 = list_items.get(i);
                    File f = new File(s1.getUri().getPath());
                    Boolean deleted = f.delete();
                    GridViewLayout.this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(new File(s1.getUri().getPath()))));
                    if (deleted == true) {
                         list_items.remove(i);
                         list.remove(s1);
                        adapter.notifyDataSetChanged();
                    }
                }
                Toast.makeText(GridViewLayout.this, count +"Deleted", Toast.LENGTH_SHORT).show();
               count=0;
               mode.finish();

                return true;

                default:  return  false;
            }

    }
    @Override
    public void onDestroyActionMode(ActionMode mode) {

    }

Answer 1

也许您可以在Spacecraft中添加标志isSelected属性以在CustomAdapter中使用。您可以看到一些东西来显示基于isSelected标志的边框

更改标志后，您需要先通知数据集更改。

如何在gridviewlayout中的多个选择上更改图像的边框？

1 个答案: