Android UI开发第二十三篇——分享书架UI实现
android中有很多的电子书阅读应用，应用中都仿真了书架的实现，这里也分享一篇读书应用的书架实现： java： public class ShelvesView extends GridView { private Bitmap mShelfBackground; private int mShelfWidth; private int mShelfHeight; private Bitmap mWebLeft; private Bitmap mWebRight; private int mWebRightWidth; public ShelvesView(Context context) { super(context); init(context); } public ShelvesView(Context context, AttributeSet attrs) { super(context, attrs); load(context, attrs, 0); init(context); } public ShelvesView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); load(context, attrs, defStyle); init(context); } private void load(Context context, AttributeSet attrs, int defStyle) { TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ShelvesView, defStyle, 0); final Resources resources = getResources(); final int background = a.getResourceId(R.styleable.ShelvesView_shelfBackground, 0); final Bitmap shelfBackground = BitmapFactory.decodeResource(resources, background); if (shelfBackground != null) { mShelfWidth = shelfBackground.getWidth(); mShelfHeight = shelfBackground.getHeight(); mShelfBackground = shelfBackground; } mWebLeft = BitmapFactory.decodeResource(resources, R.drawable.web_left); final Bitmap webRight = BitmapFactory.decodeResource(resources, R.drawable.web_right); mWebRightWidth = webRight.getWidth(); mWebRight = webRight; a.recycle(); } private void init(Context context) { StateListDrawable drawable = new StateListDrawable(); SpotlightDrawable start = new SpotlightDrawable(context, this); start.disableOffset(); SpotlightDrawable end = new SpotlightDrawable(context, this, R.drawable.spotlight_blue); end.disableOffset(); TransitionDrawable transition = new TransitionDrawable(start, end); drawable.addState(new int[] { android.R.attr.state_pressed }, transition); final SpotlightDrawable normal = new SpotlightDrawable(context, this); drawable.addState(new int[] { }, normal); normal.setParent(drawable); transition.setParent(drawable); setSelector(drawable); setDrawSelectorOnTop(false); } @Override protected void dispatchDraw(Canvas canvas) { final int count = getChildCount(); final int top = count > 0 ? getChildAt(0).getTop() : 0; final int shelfWidth = mShelfWidth; final int shelfHeight = mShelfHeight; final int width = getWidth(); final int height = getHeight(); final Bitmap background = mShelfBackground; for (int x = 0; x < width; x += shelfWidth) { for (int y = top; y < height; y += shelfHeight) { canvas.drawBitmap(background, x, y, null); } } if (count == 0) { canvas.drawBitmap(mWebLeft, 0.0f, top + 1, null); canvas.drawBitmap(mWebRight, width - mWebRightWidth, top + shelfHeight + 1, null); } super.dispatchDraw(canvas); } @Override public void setPressed(boolean pressed) { super.setPressed(pressed); final Drawable current = getSelector().getCurrent(); if (current instanceof TransitionDrawable) { if (pressed) { ((TransitionDrawable) current).startTransition( ViewConfiguration.getLongPressTimeout()); } else { ((TransitionDrawable) current).resetTransition(); } } } } 代码：http://download.csdn.net/detail/xyz_lmn/4698124 本文转自xyz_lmn51CTO博客，原文链接：http://blog.51cto.com/xyzlmn/1230767，如需转载请自行联系原作者
