Question

我有一个复选框，选中后，将图标变为bitmapdrawable。然后我希望bitmap drawable能够显示在gridView中。我似乎无法让这个工作。这是我的复选框：

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");
                    }

                }

然后我试图让drawablebitmap显示在我的gridView中：

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();
        }
    });
}

有人告诉我试试 ArrayList Drawable而不是Integer，工作正常，但我不确定如何添加位图。

如何添加复选框onCheckedChange方法中的位图以显示在我的gridView中？

Answer 1

当您使用ArrayList Drawable而不是Integer时，必须将位图添加到该可绘制数组，然后调用适配器的notifyDataSetChanged（）函数。它会像

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

需要帮助从一个类绘制到gridView

1 个答案: