Android仿Iphone文件夹分裂效果

package cn.com.lnb; import java.util.ArrayList; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.view.View; import android.widget.Scroller; /** * 文件夹特效类 * * @author liaonaibo * */ public class FolderCoverView extends View { private Bitmap mCurrentPageBitmap; private Bitmap mFolderBitmap; private int mWidth; private int mHeight; private int mTop; private int mFolderLeft; private int mFolderTop; private Paint transPaint; private Paint mPaint; private Scroller mScroller; private ArrayList<Bitmap> mRecycleBitmaps; private int mDeltay; public static final int SCROLL_CLOSE_DURATION = 2000; /** * 文件夹特效类 * * @param context * @param currentPageBitmap * @param top * @param width * 根据手机屏幕尺寸决定 * @param height * 根据view为upCover还是downCover来设定，upCover:屏幕顶部到文件夹图标的底部高度；downCover: * @param currentFolderBitmap * @param iconLeft * @param iconTop */ public FolderCoverView(Context context, Bitmap currentPageBitmap, int top, int width, int height, Bitmap currentFolderBitmap, int iconLeft, int iconTop, int wallpaperTop) { super(context); mCurrentPageBitmap = currentPageBitmap; // mScreenBitmap = Bitmap.createBitmap(currentPageBitmap, 0, top, width, // height); mFolderBitmap = currentFolderBitmap; mWidth = width; mHeight = height; mTop = top; mScroller = new Scroller(context); mFolderLeft = iconLeft; mFolderTop = iconTop; mRecycleBitmaps = new ArrayList<Bitmap>(); mRecycleBitmaps.add(currentPageBitmap); } @Override public void draw(Canvas canvas) { transPaint = new Paint(Paint.ANTI_ALIAS_FLAG); transPaint.setAlpha(0x88); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(getContext().getResources().getColor( R.color.delete_color_filter)); mPaint.setAlpha(0xff); // 画壁纸 canvas.drawBitmap(createCurrentWallpaper(mCurrentPageBitmap), 0, mTop, null); // 画桌面item // canvas.drawBitmap(mScreenBitmap, 0, mTop, transPaint); // 只针对upCover if (mFolderBitmap != null) { // 画箭头和文件夹 Bitmap arrow = createArrowBitmap(); canvas.drawBitmap(mFolderBitmap, mFolderLeft, mFolderTop, null); canvas.drawBitmap(arrow, mFolderLeft + mFolderBitmap.getWidth() / 2 - (int) getResources().getDimension( R.dimen.saf_folder_cover_arrow_width) / 2, mHeight - arrow.getHeight(), null); } } /** * 将界面内容进行滚动 * * @param startx * Starting horizontal scroll offset in pixels. Positive numbers * will scroll the content to the left. * @param starty * Starting vertical scroll offset in pixels. Positive numbers * will scroll the content up. * @param deltax * Horizontal distance to travel. Positive numbers will scroll * the content to the left. * @param deltay * Vertical distance to travel. Positive numbers will scroll the * content up. * @param Duration * of the scroll in milliseconds. */ public void slideBy(int startx, int starty, int deltax, int deltay, int duration) { mDeltay = deltay; if (!mScroller.isFinished()) { mScroller.abortAnimation(); } mScroller.startScroll(startx, starty, deltax, deltay, duration); this.invalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { int desY = mScroller.getCurrY(); this.scrollTo(0, desY); postInvalidate(); } else { super.computeScroll(); } } public Bitmap createCurrentWallpaper(Bitmap currentPageBitmap) { Bitmap coverBg = Bitmap.createBitmap(currentPageBitmap, 0, mTop, mWidth, mHeight); return coverBg; } public Bitmap createArrowBitmap() { Bitmap arrow = ImageUtil.createBitmapThumbnail( BitmapFactory.decodeResource(getResources(), R.drawable.saf_folder_indicator), (int) getResources() .getDimension(R.dimen.saf_folder_cover_arrow_width), (int) getResources().getDimension( R.dimen.saf_folder_cover_arrow_height)); // 记得回收bitmap return arrow; } public void recycleAll() { for (Bitmap garbage : mRecycleBitmaps) { garbage.recycle(); } mRecycleBitmaps.clear(); mRecycleBitmaps = null; } public int getDeltay() { return mDeltay; } }