Android项目中的BitMapUtil 将图片/bitmap方形转变成圆形

来源：互联网发布：宽带网络套餐十机顶盒编辑：程序博客网时间：2024/06/08 15:58
public class BitMapUtil {    private static final Options    OPTIONS_GET_SIZE = new Options ();    private static final Options    OPTIONS_DECODE   = new Options ();    private static final byte[]     LOCKED           = new byte[0];    // 此对象用来保持Bitmap的回收顺序,保证最后使用的图片被回收    private static final LinkedList CACHE_ENTRIES    = new LinkedList ();    // 线程请求创建图片的队列    private static final Queue      TASK_QUEUE       = new LinkedList ();    // 保存队列中正在处理的图片的key,有效防止重复添加到请求创建队列    private static final Set        TASK_QUEUE_INDEX = new HashSet ();    // 缓存Bitmap    private static final Map        IMG_CACHE_INDEX  = new HashMap ();   // 通过图片路径,图片大小    // 缓存图片的大小    private static int              CACHE_SIZE       = 20;               // 缓存图片数量    static {        OPTIONS_GET_SIZE.inJustDecodeBounds = true;        // 初始化创建图片线程,并等待处理        new Thread () {            {                setDaemon (true);            }            public void run(){                while (true) {                    synchronized (TASK_QUEUE) {                        if (TASK_QUEUE.isEmpty ()) {                            try {                                TASK_QUEUE.wait ();                            } catch (InterruptedException e) {                                e.printStackTrace ();                            }                        }                    }                    QueueEntry entry = (QueueEntry) TASK_QUEUE.poll ();                    String key = createKey (entry.path);                    TASK_QUEUE_INDEX.remove (key);                }            }        }.start ();    }    public static Bitmap getBitmap(String path){        if (path == null) { return null; }        Bitmap bitMap = null;        try {            if (CACHE_ENTRIES.size () >= CACHE_SIZE) {                destoryLast ();            }            bitMap = useBitmap (path);            if (bitMap != null && !bitMap.isRecycled ()) { return bitMap; }            bitMap = createBitmap (path);            String key = createKey (path);            synchronized (LOCKED) {                IMG_CACHE_INDEX.put (key, bitMap);                CACHE_ENTRIES.addFirst (key);            }        } catch (OutOfMemoryError err) {            destoryLast ();            return createBitmap (path);        }        return bitMap;    }    // ------------------------------------------------------------------ private Methods    // 将图片加入队列头    private static Bitmap useBitmap(String path){        Bitmap bitMap = null;        String key = createKey (path);        synchronized (LOCKED) {            bitMap = (Bitmap) IMG_CACHE_INDEX.get (key);            if (null != bitMap) {                if (CACHE_ENTRIES.remove (key)) {                    CACHE_ENTRIES.addFirst (key);                }            }        }        return bitMap;    }    // 回收最后一张图片    private static void destoryLast(){        synchronized (LOCKED) {            String key = (String) CACHE_ENTRIES.removeLast ();            if (key.length () > 0) {                Bitmap bitMap = (Bitmap) IMG_CACHE_INDEX.remove (key);                if (bitMap != null && !bitMap.isRecycled ()) {                    bitMap.recycle ();                    bitMap = null;                }            }        }    }    // 创建键    private static String createKey(String path){        if (null == path || path.length () == 0) { return ""; }        return path;    }    // 通过图片路径,宽度高度创建一个Bitmap对象    private static Bitmap createBitmap(String path){        return PictureUtils.getBitmapByPath (path);    }    // 队列缓存参数对象    static class QueueEntry {        public String path;    }    /**     *      *@Description: TODO(将四方形的图片转换成为圆形图片)      *@Author: 郭永振     *@Since: 2016-10-19下午12:11:05     *@param bitmap     *@return     */    public static Bitmap toRoundBitmap(Bitmap bitmap) {          //圆形图片宽高          int width = bitmap.getWidth();          int height = bitmap.getHeight();          //正方形的边长          int r = 0;          //取最短边做边长          if(width > height) {              r = height;          } else {              r = width;          }          //构建一个bitmap          Bitmap backgroundBmp = Bitmap.createBitmap(width,                   height, Config.ARGB_8888);          //new一个Canvas，在backgroundBmp上画图          Canvas canvas = new Canvas(backgroundBmp);          Paint paint = new Paint();          //设置边缘光滑，去掉锯齿          paint.setAntiAlias(true);          //宽高相等，即正方形          RectF rect = new RectF(0, 0, r, r);          //通过制定的rect画一个圆角矩形，当圆角X轴方向的半径等于Y轴方向的半径时，          //且都等于r/2时，画出来的圆角矩形就是圆形          canvas.drawRoundRect(rect, r/2, r/2, paint);          //设置当两个图形相交时的模式，SRC_IN为取SRC图形相交的部分，多余的将被去掉          paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));          //canvas将bitmap画在backgroundBmp上          canvas.drawBitmap(bitmap, null, rect, paint);          //返回已经绘画好的backgroundBmp          return backgroundBmp;      }}
0 0