Gridview. setchoicemode (gridview. choice_mode_multiple_modal) is not compatible with earlier version system solutions

In project development, you need to use the gridview batch processing operation and select multiple options.

However, gridview. setchoicemode (gridview. choice_mode_multiple_modal) is not compatible with earlier versions.

Find a solution and view the options of multiple options of the gridview in the demo provided by the android SDK.

public class Grid3 extends Activity {    GridView mGrid;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        loadApps();        setContentView(R.layout.grid_1);        mGrid = (GridView) findViewById(R.id.myGrid);        mGrid.setAdapter(new AppsAdapter());        mGrid.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);        mGrid.setMultiChoiceModeListener(new MultiChoiceModeListener());    }    private List<ResolveInfo> mApps;    private void loadApps() {        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);        mApps = getPackageManager().queryIntentActivities(mainIntent, 0);    }    public class AppsAdapter extends BaseAdapter {        public AppsAdapter() {        }        public View getView(int position, View convertView, ViewGroup parent) {            CheckableLayout l;            ImageView i;            if (convertView == null) {                i = new ImageView(Grid3.this);                i.setScaleType(ImageView.ScaleType.FIT_CENTER);                i.setLayoutParams(new ViewGroup.LayoutParams(50, 50));                l = new CheckableLayout(Grid3.this);                l.setLayoutParams(new GridView.LayoutParams(GridView.LayoutParams.WRAP_CONTENT,                        GridView.LayoutParams.WRAP_CONTENT));                l.addView(i);            } else {                l = (CheckableLayout) convertView;                i = (ImageView) l.getChildAt(0);            }            ResolveInfo info = mApps.get(position);            i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));            return l;        }        public final int getCount() {            return mApps.size();        }        public final Object getItem(int position) {            return mApps.get(position);        }        public final long getItemId(int position) {            return position;        }    }    public class CheckableLayout extends FrameLayout implements Checkable {        private boolean mChecked;        public CheckableLayout(Context context) {            super(context);        }        public void setChecked(boolean checked) {            mChecked = checked;            setBackgroundDrawable(checked ?                    getResources().getDrawable(R.drawable.blue)                    : null);        }        public boolean isChecked() {            return mChecked;        }        public void toggle() {            setChecked(!mChecked);        }    }    public class MultiChoiceModeListener implements GridView.MultiChoiceModeListener {        public boolean onCreateActionMode(ActionMode mode, Menu menu) {            mode.setTitle("Select Items");            mode.setSubtitle("One item selected");            return true;        }        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {            return true;        }        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {            return true;        }        public void onDestroyActionMode(ActionMode mode) {        }        public void onItemCheckedStateChanged(ActionMode mode, int position, long id,                boolean checked) {            int selectCount = mGrid.getCheckedItemCount();            switch (selectCount) {            case 1:                mode.setSubtitle("One item selected");                break;            default:                mode.setSubtitle("" + selectCount + " items selected");                break;            }        }    }}

Implements implements checkable, And you can set multiple options for the gridview, but it is not compatible with earlier versions.

Later, I learned how to solve the problem of compatibility with lower versions. For details, refer to the code.

Adapter set for the gridview

List<CodeGoodsListEntiy> goods = new ArrayList<CodeGoodsListEntiy>();public class CollectionAdapter extends BaseAdapter{@Overridepublic int getCount() {// TODO Auto-generated method stubreturn goods.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}public void addDataList(List<CodeGoodsListEntiy> goodsList){goods.addAll(goodsList);}public void removeAllList(){goods.removeAll(goods);}public void removeData(CodeGoodsListEntiy entity){goods.remove(entity);}public List<CodeGoodsListEntiy> getList(){return goods;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubCheckableLayout layout = null;CodeGoodsListEntiy good = goods.get(position);if(convertView==null){layout = new CheckableLayout();convertView = inflater.inflate(R.layout.mycollection_griditem, null);layout.imgviewlayout = (RelativeLayout) convertView.findViewById(R.id.imgviewlayout);layout.iv = (ImageView) convertView.findViewById(R.id.iv);layout.price = (TextView) convertView.findViewById(R.id.price);layout.title = (TextView) convertView.findViewById(R.id.title);layout.sellnums = (TextView) convertView.findViewById(R.id.sells);layout.item_selectbtn = (ImageView) convertView.findViewById(R.id.item_selectbtn);layout.item_topview = (ImageView) convertView.findViewById(R.id.item_topview);convertView.setTag(layout);}else{layout =  (CheckableLayout) convertView.getTag();}layout.price.setText("￥"+good.getSalePrice());layout.title.setText(good.getTitle());layout.sellnums.setText("月销量"+good.getSellNums());layout.imgviewlayout.getLayoutParams().height = (SettingUtil.getDisplaywidthPixels() - SettingUtil.dip2px(8)) / 2;layout.iv.getLayoutParams().height = (SettingUtil.getDisplaywidthPixels() - SettingUtil.dip2px(10)) / 2;App.imageLoader.displayImage(good.getMainImg(), layout.iv, options, new SimpleImageLoadingListener());if(editModel){if(selecteditem.contains(position)){layout.setChecked(true);}else{layout.setChecked(false);}}else{layout.item_selectbtn.setVisibility(View.GONE);layout.item_topview.setVisibility(View.GONE);}return convertView;}}class CheckableLayout implements Checkable{View convertView;ImageView item_selectbtn;ImageView item_topview;ImageView iv;TextView price;TextView title;TextView sellnums;RelativeLayout imgviewlayout;private boolean mChecked = false;public CheckableLayout() {// TODO Auto-generated constructor stub}@Overridepublic void setChecked(boolean checked) {// TODO Auto-generated method stubmChecked = checked;if(item_topview!=null){if(mChecked){item_topview.setVisibility(View.GONE);}else{item_topview.setVisibility(View.VISIBLE);}}if(item_selectbtn!=null){if(mChecked){item_selectbtn.setVisibility(View.VISIBLE);}else{item_selectbtn.setVisibility(View.GONE);}}}@Overridepublic boolean isChecked() {// TODO Auto-generated method stubreturn mChecked;}@Overridepublic void toggle() {// TODO Auto-generated method stubsetChecked(!mChecked);}}

In fact, the class checkablelayout implements checkable is similar to the viewholder class in a general adapter.

The itemclicklistener method set for the gridview

private OnItemClickListener onlvItemClick = new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {if(editModel){CheckableLayout holder = (CheckableLayout) arg1.getTag();if(selecteditem.contains(arg2)){selecteditem.remove((Integer)arg2);holder.setChecked(false);}else{selecteditem.add(arg2);holder.setChecked(true);}}else{ProDetailActivity.launch(MyCollectionActivity.this, goods.get(arg2).getItemId());}}};

In fact, the key here is to get the viewholder class through the sent view.

Checkablelayout holder = (checkablelayout) arg1.gettag ();

Let's talk about it here. Many project codes involve commercialization and can be shared if you have any questions. This method requires attention to the details.

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Gridview. setchoicemode (gridview. choice_mode_multiple_modal) is not compatible with earlier version system solutions