求launcher showPreviews代码一份

Answer 1

   跟go Launcher 屏幕预览效果差不多.

Answer 2

   呵呵  不要小看了， 用过go Launcher没？ 大致跟它那种浏览screen 差不多，可以增加screen 也可以删除

Answer 3

private void showPreviews(final View anchor, int start, int end) 
 {
        final Resources resources = getResources();
        final lhkworkspace workspace = mWorkspace;
        System.out.println("end=" +end);
        CellLayout cell = ((CellLayout) workspace.getChildAt(start));
        
        float max = workspace.getChildCount();
        
        final Rect r = new Rect();//8*6
        resources.getDrawable(R.drawable.preview_background).getPadding(r);
        int extraW = (int) ((r.left + r.right) * max); //40
        int extraH = r.top + r.bottom; //6
        System.out.println("extraW=" +extraW);
        System.out.println("extraH=" +extraH);
        
        int aW = cell.getWidth() - extraW;
        System.out.println("cell.getWidth()=" +cell.getWidth());//0
        float w = aW / max;         int width = cell.getWidth();
        int height = cell.getHeight();
        System.out.println("cell.getHeight()=" +cell.getHeight());//0
        int x = cell.getLeftPadding();//6
        int y = cell.getTopPadding();//0
        System.out.println("x=" +x);
        System.out.println("y=" +y);
        width -= (x + cell.getRightPadding());
        height -= (y + cell.getBottomPadding());
        System.out.println("cell.getRightPadding()=" +cell.getRightPadding());//59
        System.out.println("cell.getBottomPadding()=" +cell.getBottomPadding());//0
        
        float scale = w / width;         int count = end - start;         final float sWidth = width * scale;
        float sHeight = height * scale;         LinearLayout preview = new LinearLayout(this);         PreviewTouchHandler handler = new PreviewTouchHandler(anchor);
        ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>(count);
        System.out.println(sWidth);
        System.out.println(sHeight);
        for (int i = start; i < end; i++) 
        {
            ImageView image = new ImageView(this);
            cell = (CellLayout) workspace.getChildAt(i);             final Bitmap bitmap = Bitmap.createBitmap((int) 30, (int) 40,
                    Bitmap.Config.ARGB_8888);             final Canvas c = new Canvas(bitmap);
            c.scale(scale, scale);
            c.translate(-cell.getLeftPadding(), -cell.getTopPadding());
            cell.dispatchDraw(c);             image.setBackgroundDrawable(resources.getDrawable(R.drawable.preview_background));
            image.setImageBitmap(bitmap);
            image.setTag(i);
            image.setOnClickListener(handler);
            image.setOnFocusChangeListener(handler);
            image.setFocusable(true);
            if (i == mWorkspace.getCurrentScreen()) image.requestFocus();             preview.addView(image,
                    LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);             bitmaps.add(bitmap);            
        }         final PopupWindow p = new PopupWindow(this);
        p.setContentView(preview);
        p.setWidth((int) (200));
        p.setHeight((int) (40));
        p.setAnimationStyle(R.style.AnimationPreview);
        p.setOutsideTouchable(true);
        p.setFocusable(true);
        p.setBackgroundDrawable(new ColorDrawable(0));
        p.showAsDropDown(anchor, 0, 0);         p.setOnDismissListener(new PopupWindow.OnDismissListener() 
        {
            public void onDismiss() 
            {
                dismissPreview(anchor);
            }
        });         anchor.setTag(p);
        anchor.setTag(R.id.workspace, preview);
        anchor.setTag(R.id.icon, bitmaps);        
    }