android 图片处理工具类

图片工具类，可用于Bitmap, byte array, Drawable之间进行转换以及图片缩放，目前功能薄弱，后面会进行增强。如：
bitmapToDrawable(Bitmap b) bimap转换为drawable
drawableToBitmap(Drawable d) drawable转换为bitmap
drawableToByte(Drawable d) drawable转换为byte
scaleImage(Bitmap org, float scaleWidth, float scaleHeight) 缩放图片
package cn.trinea.android.common.util;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.Map;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;/** * ImageUtils *  * convert between Bitmap, byte array, Drawable * {@link #bitmapToByte(Bitmap)}
 * {@link #bitmapToDrawable(Bitmap)}
 * {@link #byteToBitmap(byte[])}
 * {@link #byteToDrawable(byte[])}
 * {@link #drawableToBitmap(Drawable)}
 * {@link #drawableToByte(Drawable)}
 * 
 *  * get image * {@link #getInputStreamFromUrl(String, int)}
 * {@link #getBitmapFromUrl(String, int)}
 * {@link #getDrawableFromUrl(String, int)}
 * 
 *  * scale image * {@link #scaleImageTo(Bitmap, int, int)}
 * {@link #scaleImage(Bitmap, float, float)}
 * 
 *  * @author Trinea 2012-6-27 */public class ImageUtils {    private ImageUtils() {        throw new AssertionError();    }    /**     * convert Bitmap to byte array     *      * @param b     * @return     */    public static byte[] bitmapToByte(Bitmap b) {        if (b == null) {            return null;        }        ByteArrayOutputStream o = new ByteArrayOutputStream();        b.compress(Bitmap.CompressFormat.PNG, 100, o);        return o.toByteArray();    }    /**     * convert byte array to Bitmap     *      * @param b     * @return     */    public static Bitmap byteToBitmap(byte[] b) {        return (b == null || b.length == 0) ? null : BitmapFactory.decodeByteArray(b, 0, b.length);    }    /**     * convert Drawable to Bitmap     *      * @param d     * @return     */    public static Bitmap drawableToBitmap(Drawable d) {        return d == null ? null : ((BitmapDrawable)d).getBitmap();    }    /**     * convert Bitmap to Drawable     *      * @param b     * @return     */    public static Drawable bitmapToDrawable(Bitmap b) {        return b == null ? null : new BitmapDrawable(b);    }    /**     * convert Drawable to byte array     *      * @param d     * @return     */    public static byte[] drawableToByte(Drawable d) {        return bitmapToByte(drawableToBitmap(d));    }    /**     * convert byte array to Drawable     *      * @param b     * @return     */    public static Drawable byteToDrawable(byte[] b) {        return bitmapToDrawable(byteToBitmap(b));    }    /**     * get input stream from network by imageurl, you need to close inputStream yourself     *      * @param imageUrl     * @param readTimeOutMillis     * @return     * @see ImageUtils#getInputStreamFromUrl(String, int, boolean)     */    public static InputStream getInputStreamFromUrl(String imageUrl, int readTimeOutMillis) {        return getInputStreamFromUrl(imageUrl, readTimeOutMillis, null);    }    /**     * get input stream from network by imageurl, you need to close inputStream yourself     *      * @param imageUrl     * @param readTimeOutMillis read time out, if less than 0, not set, in mills     * @param requestProperties http request properties     * @return     * @throws MalformedURLException     * @throws IOException     */    public static InputStream getInputStreamFromUrl(String imageUrl, int readTimeOutMillis,            Map requestProperties) {        InputStream stream = null;        try {            URL url = new URL(imageUrl);            HttpURLConnection con = (HttpURLConnection)url.openConnection();            HttpUtils.setURLConnection(requestProperties, con);            if (readTimeOutMillis > 0) {                con.setReadTimeout(readTimeOutMillis);            }            stream = con.getInputStream();        } catch (MalformedURLException e) {            closeInputStream(stream);            throw new RuntimeException("MalformedURLException occurred. ", e);        } catch (IOException e) {            closeInputStream(stream);            throw new RuntimeException("IOException occurred. ", e);        }        return stream;    }    /**     * get drawable by imageUrl     *      * @param imageUrl     * @param readTimeOutMillis     * @return     * @see ImageUtils#getDrawableFromUrl(String, int, boolean)     */    public static Drawable getDrawableFromUrl(String imageUrl, int readTimeOutMillis) {        return getDrawableFromUrl(imageUrl, readTimeOutMillis, null);    }    /**     * get drawable by imageUrl     *      * @param imageUrl     * @param readTimeOutMillis read time out, if less than 0, not set, in mills     * @param requestProperties http request properties     * @return     */    public static Drawable getDrawableFromUrl(String imageUrl, int readTimeOutMillis,            Map requestProperties) {        InputStream stream = getInputStreamFromUrl(imageUrl, readTimeOutMillis, requestProperties);        Drawable d = Drawable.createFromStream(stream, "src");        closeInputStream(stream);        return d;    }    /**     * get Bitmap by imageUrl     *      * @param imageUrl     * @param readTimeOut     * @return     * @see ImageUtils#getBitmapFromUrl(String, int, boolean)     */    public static Bitmap getBitmapFromUrl(String imageUrl, int readTimeOut) {        return getBitmapFromUrl(imageUrl, readTimeOut, null);    }    /**     * get Bitmap by imageUrl     *      * @param imageUrl     * @param requestProperties http request properties     * @return     */    public static Bitmap getBitmapFromUrl(String imageUrl, int readTimeOut, Map requestProperties) {        InputStream stream = getInputStreamFromUrl(imageUrl, readTimeOut, requestProperties);        Bitmap b = BitmapFactory.decodeStream(stream);        closeInputStream(stream);        return b;    }    /**     * scale image     *      * @param org     * @param newWidth     * @param newHeight     * @return     */    public static Bitmap scaleImageTo(Bitmap org, int newWidth, int newHeight) {        return scaleImage(org, (float)newWidth / org.getWidth(), (float)newHeight / org.getHeight());    }    /**     * scale image     *      * @param org     * @param scaleWidth sacle of width     * @param scaleHeight scale of height     * @return     */    public static Bitmap scaleImage(Bitmap org, float scaleWidth, float scaleHeight) {        if (org == null) {            return null;        }        Matrix matrix = new Matrix();        matrix.postScale(scaleWidth, scaleHeight);        return Bitmap.createBitmap(org, 0, 0, org.getWidth(), org.getHeight(), matrix, true);    }    /**     * close inputStream     *      * @param s     */    private static void closeInputStream(InputStream s) {        if (s == null) {            return;        }        try {            s.close();        } catch (IOException e) {            throw new RuntimeException("IOException occurred. ", e);        }    }}
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