Need Help getting drawable from one class into gridView

问题

I have a checkbox, that when checked, turns an icon into a bitmapdrawable. I then want that bitmap drawable to be able to show up in a gridView. I can't seem to get this working. Here is my checkbox:

addCheckbox
            .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView,
                        boolean isChecked) {
                    if (addCheckbox.isChecked()) {
                        System.out.println("Checked");
                        PackageManager pm = mContext.getPackageManager();
                        Drawable icon = null;
                        try {
                            icon = pm
                                    .getApplicationIcon(entry.packageName);
                        } catch (NameNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        Drawable default_icon = pm.getDefaultActivityIcon();
                        if (icon instanceof BitmapDrawable
                                && default_icon instanceof BitmapDrawable) {
                            BitmapDrawable icon_bd = (BitmapDrawable) icon;
                            Bitmap icon_b = icon_bd.getBitmap();
                            BitmapDrawable default_bd = (BitmapDrawable) pm
                                    .getDefaultActivityIcon();
                            Bitmap default_b = default_bd.getBitmap();
                            if (icon_b == default_b) {
                                // It's the default icon
                            }
                        }
                    } else {
                        System.out.println("Un-Checked");
                    }

                }

Then I am trying to get the drawablebitmap to show up in my gridView here:

package com.example.awesomefilebuilderwidget;

IMPORTS

public class GridView extends Activity implements OnItemLongClickListener, OnDragListener{

ArrayList<Integer> drawables = new ArrayList<Integer>();

private BaseAdapter adapter;
private int draggedIndex = -1;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.drag_and_drop_app);
    drawables = new ArrayList<Integer>();
    drawables.add(R.drawable.pattern1);
    drawables.add(R.drawable.pattern2);
    android.widget.GridView gridView = (android.widget.GridView) findViewById(R.id.grid_view);
    gridView.setOnItemLongClickListener(this);
    gridView.setAdapter(adapter = new BaseAdapter() {

        @Override
        // Get a View that displays the data at the specified position in
        // the data set.
        public View getView(int position, View convertView,
                ViewGroup gridView) {
            // try to reuse the views.
            ImageView view = (ImageView) convertView;
            // if convert view is null then create a new instance else reuse
            // it
            if (view == null) {
                view = new ImageView(GridView.this);
            }
            view.setImageResource(drawables.get(position));
            view.setScaleType(ImageView.ScaleType.CENTER_CROP);
            view.setLayoutParams(new android.widget.GridView.LayoutParams(70, 70));
            view.setTag(String.valueOf(position));
            return view;
        }

        @Override
        // Get the row id associated with the specified position in the
        // list.
        public long getItemId(int position) {
            return position;
        }

        @Override
        // Get the data item associated with the specified position in the
        // data set.
        public Object getItem(int position) {
            return drawables.get(position);
        }

        @Override
        // How many items are in the data set represented by this Adapter.
        public int getCount() {
            return drawables.size();
        }
    });
}

I was told to try ArrayList Drawable instead of Integer, which worked fine but I'm not sure on how to add the bitmap.

How can I add the bitmap made in my checkbox onCheckedChange method to show up in my gridView?

回答1:

When you are using ArrayList Drawable instead of Integer then you must add your bitmap to that drawable array and then call notifyDataSetChanged() function of the adapter. It will be something like

drawables.add(default_bd);  
adapter.notifyDataSetChanged()

来源：https://stackoverflow.com/questions/19669819/need-help-getting-drawable-from-one-class-into-gridview