滚动时Listview项的背景选定错误

Question

我在片段中有一个列表视图，我的问题是当我在列表视图上选择项目时就可以了，但是当我滚动列表视图时，会检查项目背景中是否有其他项目，但我不希望这样。 您可以看到我的图像，首先我选择3个项目（浏览器，日历，联系人），当我滚动列表视图时，然后2个项目（Dev工具，相机）的背景发生了更改，如果我继续滚动，则列表视图将有更多类似的项目。

这是我的代码：

    @SuppressLint("NewApi") public class Tab2 extends Fragment{
    private PackageManager packageManager = null;
    private List<ApplicationInfo> applist = null;
    public static ApplicationAdapter listadaptor = null;
    public static ListView list;
    private ActionMode acMode;
    private int counterChecked = 0;
    private SparseBooleanArray sp;

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.tab2test,container,false);
        list = (ListView)v.findViewById(R.id.list_view2);
        list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        list.setItemsCanFocus(false);
        packageManager = getActivity().getPackageManager();
        applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
        listadaptor = new ApplicationAdapter(getActivity().getApplicationContext(),R.layout.snippet_list_row, applist);
        list.setAdapter(listadaptor);
        sp = list.getCheckedItemPositions();

        list.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                //Here i set item's color and unselected color
                view.setBackgroundColor(sp.get(position)? 0x9934B5E4: Color.WHITE);
                if(counterChecked<1){
                    acMode = ((AppCompatActivity) getActivity()).startSupportActionMode(mActionModeCallback);
                }
                String str="";
                int i=0;
                for(i=0;i<sp.size();i++)
                {   
                    if(sp.valueAt(i)){
                        str+=sp.keyAt(i)+",";

                    }
                }

                if(list.isItemChecked(position)){
                    Log.d("list1", String.valueOf(position));
                    list.setItemChecked(position, true);
                    counterChecked++;
                }else{
                    list.setItemChecked(position, false);
                    counterChecked--;
                }

                if(counterChecked<1){
                    mActionModeCallback.onDestroyActionMode(acMode);

                }
            }
        });

        return v;
    }
    private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
        ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
        for (ApplicationInfo info : list) {
            try {
                if(isSystemPackage(info)){
                    if (null != packageManager.getLaunchIntentForPackage(info.packageName)) {
                        applist.add(info);
                    }                   
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return applist;
    }

    private boolean isSystemPackage(ApplicationInfo AInfo) {
        return ((AInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) ? true
                : false;
    }

    private ActionMode.Callback mActionModeCallback = new ActionMode.Callback(){

        @Override 
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
              MenuInflater inflater = mode.getMenuInflater();
              inflater.inflate(R.menu.cab_menu, menu);
              MainActivity.toolbar.setVisibility(View.GONE);
              return true;
            }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            mode.finish();
            MainActivity.toolbar.setVisibility(View.VISIBLE);
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {


            return true;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
            // TODO Auto-generated method stub
            return false;
        }
    };
}

Answer 1

实际上，您在滚动时会触发OnItemClickListener ，从而导致您不想包含的项目被多项选择。

更好的方法是在listView项内使用一个checkBox并在选中该复选框时将其标记为选中状态：请查看此链接，了解如何在Listview中使用复选框获取所选项。

如果您longClickListener于使用onClick则可以在listView Items上实现longClickListener ，这可能会阻止在滚动时选择项目，但是我的建议是使用checkBoxes 。

OnLongClickListener实现：

listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

            public boolean onItemLongClick(AdapterView<?> arg0, View v,
                    int index, long arg3) {
                // TODO Auto-generated method stub

                 String str=listView.getItemAtPosition(index).toString();


                return true;
            }
});