Android之小小图片加工厂
有时候我们在项目中，需要把图片加工一下，比如说加个圆角，或者打上马赛克或者水印，虽然不是很难的东西，但是没弄过，还是很纠结的，比如像我这样的小白，现在根据网上一些大牛的一些方法，总结了下面这个图片加工厂工具类，可能还有更多的需求，有需要的时候，再去网上找，继续完善中，，直接上跟大家分享代码，注释比较多，而且简单，我就不多说了，直接上跟大家分享代码：
/** * 图片加工厂 * * @author way * */ public class ImageUtil { /** * 通过路径获取输入流 * * @param path * 路径 * @return 输入流 * @throws Exception * 异常 */ public static InputStream getRequest(String path) throws Exception { URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5000); if (conn.getResponseCode() == 200) { return conn.getInputStream(); } return null; } /** * 从流中读取二进制数据 * * @param inStream * 输入流 * @return 二进制数据 * @throws Exception * 异常 */ public static byte[] readInputStream(InputStream inStream) throws Exception { ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[4096]; int len = 0; while ((len = inStream.read(buffer)) != -1) { outSteam.write(buffer, 0, len); } outSteam.close(); inStream.close(); return outSteam.toByteArray(); } /** * 把一个路径转换成Drawable对象 * * @param url * 路径 * @return Drawable对象 */ public static Drawable loadImageFromUrl(String url) { URL m; InputStream i = null; try { m = new URL(url); i = (InputStream) m.getContent(); } catch (MalformedURLException e1) { e1.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } Drawable d = Drawable.createFromStream(i, "src"); return d; } /** * 把一个路径转换成Drawable对象 * * @param url * 字符串路径 * @return Drawable对象 * @throws Exception * 异常 */ public static Drawable getDrawableFromUrl(String url) throws Exception { return Drawable.createFromStream(getRequest(url), null); } /** * 从路径中得到位图 * * @param url * 字符串路径 * @return 位图 * @throws Exception * 异常 */ public static Bitmap getBitmapFromUrl(String url) throws Exception { byte[] bytes = getBytesFromUrl(url); return byteToBitmap(bytes); } /** * 从路径中得到圆角位图 * * @param url * 字符串路径 * @param pixels * 圆角弧度 * @return 圆角位图 * @throws Exception * 异常 */ public static Bitmap getRoundBitmapFromUrl(String url, int pixels) throws Exception { byte[] bytes = getBytesFromUrl(url); Bitmap bitmap = byteToBitmap(bytes); return toRoundCorner(bitmap, pixels); } /** * 从路径中得到圆角Drawable对象 * * @param url * 字符串路径 * @param pixels * 圆角弧度 * @return 圆角Drawable对象 * @throws Exception * 异常 */ public static Drawable geRoundDrawableFromUrl(String url, int pixels) throws Exception { byte[] bytes = getBytesFromUrl(url); BitmapDrawable bitmapDrawable = (BitmapDrawable) byteToDrawable(bytes); return toRoundCorner(bitmapDrawable, pixels); } /** * 从路径中得到二进制数据 * * @param url * 字符串路径 * @return 二进制数据 * @throws Exception * 异常 */ public static byte[] getBytesFromUrl(String url) throws Exception { return readInputStream(getRequest(url)); } /** * 从二进制数据中得到位图 * * @param byteArray * 二进制数据 * @return 位图 */ public static Bitmap byteToBitmap(byte[] byteArray) { if (byteArray.length != 0) { return BitmapFactory .decodeByteArray(byteArray, 0, byteArray.length); } else { return null; } } /** * 从二进制数据中得到Drawable对象 * * @param byteArray * 二进制数据 * @return Drawable对象 */ public static Drawable byteToDrawable(byte[] byteArray) { ByteArrayInputStream ins = new ByteArrayInputStream(byteArray); return Drawable.createFromStream(ins, null); } /** * 把位图转换称二进制数据 * * @param bm * 位图 * @return 二进制数据 */ public static byte[] Bitmap2Bytes(Bitmap bm) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } /** * 把Drawable对象转换称位图 * * @param drawable * Drawable对象 * @return 位图 */ public static Bitmap drawableToBitmap(Drawable drawable) { Bitmap bitmap = Bitmap .createBitmap( drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); drawable.draw(canvas); return bitmap; } /** * 图片去色,返回灰度图片 * * @param bmpOriginal * 传入的图片 * @return 去色后的图片 */ public static Bitmap toGrayscale(Bitmap bmpOriginal) { int width, height; height = bmpOriginal.getHeight(); width = bmpOriginal.getWidth(); Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); Canvas c = new Canvas(bmpGrayscale); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm); paint.setColorFilter(f); c.drawBitmap(bmpOriginal, 0, 0, paint); return bmpGrayscale; } /** * 去色同时加圆角 * * @param bmpOriginal * 原图 * @param pixels * 圆角弧度 * @return 修改后的图片 */ public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) { return toRoundCorner(toGrayscale(bmpOriginal), pixels); } /** * 把位图变成圆角位图 * * @param bitmap * 需要修改的位图 * @param pixels * 圆角的弧度 * @return 圆角位图 */ public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); final float roundPx = pixels; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } /** * 将BitampDrawable转换成圆角的BitampDrawable * * @param bitmapDrawable * 原生BitampDrawable对象 * @param pixels * 圆角弧度 * @return 圆角BitampDrawable对象 */ public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable, int pixels) { Bitmap bitmap = bitmapDrawable.getBitmap(); bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels)); return bitmapDrawable; } /** * 图片水印生成的方法 * * @param src * 源图片位图 * @param watermark * 水印图片位图 * @return 返回一个加了水印的图片 */ public static Bitmap createBitmap(Bitmap src, Bitmap watermark) { if (src == null) return null; int w = src.getWidth(); int h = src.getHeight(); int ww = watermark.getWidth(); int wh = watermark.getHeight(); Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图 Canvas cv = new Canvas(newb);// 初始化画布 cv.drawBitmap(src, 0, 0, null);// 在 0，0坐标开始画入src cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角画入水印 cv.save(Canvas.ALL_SAVE_FLAG);// 保存，用来保存Canvas的状态。save之后，可以调用Canvas的平移、放缩、旋转、错切、裁剪等操作。 cv.restore();// 存储，用来恢复Canvas之前保存的状态。防止save后对Canvas执行的操作对后续的绘制有影响。 return newb; } }
