Android 图片处理工具类封装

android 图片处理工具类封装，包含保存图片、写文件到SD卡，文件转Bitmap、缩放，给图片加倒影等强大功能
import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.sql.Timestamp;import java.text.SimpleDateFormat;import android.app.Activity;import android.content.ContentResolver;import android.content.Context;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Shader.TileMode;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.net.Uri;import android.os.Environment;import android.provider.MediaStore;import android.util.DisplayMetrics;/** * 图片操作工具包 *  * @author liux (http://my.oschina.net/liux) * @version 1.0 * @created 2012-3-21 */public class ImageUtils {public final static String SDCARD_MNT = "/mnt/sdcard";public final static String SDCARD = "/sdcard";/** 请求相册 */public static final int REQUEST_CODE_GETIMAGE_BYSDCARD = 0;/** 请求相机 */public static final int REQUEST_CODE_GETIMAGE_BYCAMERA = 1;/** 请求裁剪 */public static final int REQUEST_CODE_GETIMAGE_BYCROP = 2;/** * 写图片文件 在Android系统中，文件保存在 /data/data/PACKAGE_NAME/files 目录下 *  * @throws IOException */public static void saveImage(Context context, String fileName, Bitmap bitmap)throws IOException {saveImage(context, fileName, bitmap, 100);}public static void saveImage(Context context, String fileName,Bitmap bitmap, int quality) throws IOException {if (bitmap == null || fileName == null || context == null)return;FileOutputStream fos = context.openFileOutput(fileName,Context.MODE_PRIVATE);ByteArrayOutputStream stream = new ByteArrayOutputStream();bitmap.compress(CompressFormat.JPEG, quality, stream);byte[] bytes = stream.toByteArray();fos.write(bytes);fos.close();}/** * 写图片文件到SD卡 *  * @throws IOException */public static void saveImageToSD(Context ctx, String filePath,Bitmap bitmap, int quality) throws IOException {if (bitmap != null) {File file = new File(filePath.substring(0,filePath.lastIndexOf(File.separator)));if (!file.exists()) {file.mkdirs();}BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));bitmap.compress(CompressFormat.JPEG, quality, bos);bos.flush();bos.close();if(ctx!=null){scanPhoto(ctx, filePath);}}}/** * 让Gallery上能马上看到该图片 */private static void scanPhoto(Context ctx, String imgFileName) {Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);File file = new File(imgFileName);Uri contentUri = Uri.fromFile(file);mediaScanIntent.setData(contentUri);ctx.sendBroadcast(mediaScanIntent);}/** * 获取bitmap *  * @param context * @param fileName * @return */public static Bitmap getBitmap(Context context, String fileName) {FileInputStream fis = null;Bitmap bitmap = null;try {fis = context.openFileInput(fileName);bitmap = BitmapFactory.decodeStream(fis);} catch (FileNotFoundException e) {e.printStackTrace();} catch (OutOfMemoryError e) {e.printStackTrace();} finally {try {fis.close();} catch (Exception e) {}}return bitmap;}/** * 获取bitmap *  * @param filePath * @return */public static Bitmap getBitmapByPath(String filePath) {return getBitmapByPath(filePath, null);}public static Bitmap getBitmapByPath(String filePath,BitmapFactory.Options opts) {FileInputStream fis = null;Bitmap bitmap = null;try {File file = new File(filePath);fis = new FileInputStream(file);bitmap = BitmapFactory.decodeStream(fis, null, opts);} catch (FileNotFoundException e) {e.printStackTrace();} catch (OutOfMemoryError e) {e.printStackTrace();} finally {try {fis.close();} catch (Exception e) {}}return bitmap;}/** * 获取bitmap *  * @param file * @return */public static Bitmap getBitmapByFile(File file) {FileInputStream fis = null;Bitmap bitmap = null;try {fis = new FileInputStream(file);bitmap = BitmapFactory.decodeStream(fis);} catch (FileNotFoundException e) {e.printStackTrace();} catch (OutOfMemoryError e) {e.printStackTrace();} finally {try {fis.close();} catch (Exception e) {}}return bitmap;}/** * 使用当前时间戳拼接一个唯一的文件名 *  * @param format * @return */public static String getTempFileName() {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss_SS");String fileName = format.format(new Timestamp(System.currentTimeMillis()));return fileName;}/** * 获取照相机使用的目录 *  * @return */public static String getCamerPath() {return Environment.getExternalStorageDirectory() + File.separator+ "FounderNews" + File.separator;}/** * 判断当前Url是否标准的content://样式，如果不是，则返回绝对路径 *  * @param uri * @return */public static String getAbsolutePathFromNoStandardUri(Uri mUri) {String filePath = null;String mUriString = mUri.toString();mUriString = Uri.decode(mUriString);String pre1 = "file://" + SDCARD + File.separator;String pre2 = "file://" + SDCARD_MNT + File.separator;if (mUriString.startsWith(pre1)) {filePath = Environment.getExternalStorageDirectory().getPath()+ File.separator + mUriString.substring(pre1.length());} else if (mUriString.startsWith(pre2)) {filePath = Environment.getExternalStorageDirectory().getPath()+ File.separator + mUriString.substring(pre2.length());}return filePath;}/** * 通过uri获取文件的绝对路径 *  * @param uri * @return */public static String getAbsoluteImagePath(Activity context, Uri uri) {String imagePath = "";String[] proj = { MediaStore.Images.Media.DATA };Cursor cursor = context.managedQuery(uri, proj, // Which columns to// returnnull, // WHERE clause; which rows to return (all rows)null, // WHERE clause selection arguments (none)null); // Order-by clause (ascending by name)if (cursor != null) {int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);if (cursor.getCount() > 0 && cursor.moveToFirst()) {imagePath = cursor.getString(column_index);}}return imagePath;}/** * 获取图片缩略图 只有Android2.1以上版本支持 *  * @param imgName * @param kind *            MediaStore.Images.Thumbnails.MICRO_KIND * @return */public static Bitmap loadImgThumbnail(Activity context, String imgName,int kind) {Bitmap bitmap = null;String[] proj = { MediaStore.Images.Media._ID,MediaStore.Images.Media.DISPLAY_NAME };Cursor cursor = context.managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,MediaStore.Images.Media.DISPLAY_NAME + "='" + imgName + "'",null, null);if (cursor != null && cursor.getCount() > 0 && cursor.moveToFirst()) {ContentResolver crThumb = context.getContentResolver();BitmapFactory.Options options = new BitmapFactory.Options();options.inSampleSize = 1;bitmap = MethodsCompat.getThumbnail(crThumb, cursor.getInt(0),kind, options);}return bitmap;}public static Bitmap loadImgThumbnail(String filePath, int w, int h) {Bitmap bitmap = getBitmapByPath(filePath);return zoomBitmap(bitmap, w, h);}/** * 获取SD卡中最新图片路径 *  * @return */public static String getLatestImage(Activity context) {String latestImage = null;String[] items = { MediaStore.Images.Media._ID,MediaStore.Images.Media.DATA };Cursor cursor = context.managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, items, null,null, MediaStore.Images.Media._ID + " desc");if (cursor != null && cursor.getCount() > 0) {cursor.moveToFirst();for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {latestImage = cursor.getString(1);break;}}return latestImage;}/** * 计算缩放图片的宽高 *  * @param img_size * @param square_size * @return */public static int[] scaleImageSize(int[] img_size, int square_size) {if (img_size[0] <= square_size && img_size[1] <= square_size)return img_size;double ratio = square_size/ (double) Math.max(img_size[0], img_size[1]);return new int[] { (int) (img_size[0] * ratio),(int) (img_size[1] * ratio) };}/** * 创建缩略图 *  * @param context * @param largeImagePath *            原始大图路径 * @param thumbfilePath *            输出缩略图路径 * @param square_size *            输出图片宽度 * @param quality *            输出图片质量 * @throws IOException */public static void createImageThumbnail(Context context,String largeImagePath, String thumbfilePath, int square_size,int quality) throws IOException {BitmapFactory.Options opts = new BitmapFactory.Options();opts.inSampleSize = 1;// 原始图片bitmapBitmap cur_bitmap = getBitmapByPath(largeImagePath, opts);if (cur_bitmap == null)return;// 原始图片的高宽int[] cur_img_size = new int[] { cur_bitmap.getWidth(),cur_bitmap.getHeight() };// 计算原始图片缩放后的宽高int[] new_img_size = scaleImageSize(cur_img_size, square_size);// 生成缩放后的bitmapBitmap thb_bitmap = zoomBitmap(cur_bitmap, new_img_size[0],new_img_size[1]);// 生成缩放后的图片文件saveImageToSD(null,thumbfilePath, thb_bitmap, quality);}/** * 放大缩小图片 *  * @param bitmap * @param w * @param h * @return */public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {Bitmap newbmp = null;if (bitmap != null) {int width = bitmap.getWidth();int height = bitmap.getHeight();Matrix matrix = new Matrix();float scaleWidht = ((float) w / width);float scaleHeight = ((float) h / height);matrix.postScale(scaleWidht, scaleHeight);newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix,true);}return newbmp;}public static Bitmap scaleBitmap(Bitmap bitmap) {// 获取这个图片的宽和高int width = bitmap.getWidth();int height = bitmap.getHeight();// 定义预转换成的图片的宽度和高度int newWidth = 200;int newHeight = 200;// 计算缩放率，新尺寸除原始尺寸float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;// 创建操作图片用的matrix对象Matrix matrix = new Matrix();// 缩放图片动作matrix.postScale(scaleWidth, scaleHeight);// 旋转图片 动作// matrix.postRotate(45);// 创建新的图片Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height,matrix, true);return resizedBitmap;}/** * (缩放)重绘图片 *  * @param context *            Activity * @param bitmap * @return */public static Bitmap reDrawBitMap(Activity context, Bitmap bitmap) {DisplayMetrics dm = new DisplayMetrics();context.getWindowManager().getDefaultDisplay().getMetrics(dm);int rHeight = dm.heightPixels;int rWidth = dm.widthPixels;// float rHeight=dm.heightPixels/dm.density+0.5f;// float rWidth=dm.widthPixels/dm.density+0.5f;// int height=bitmap.getScaledHeight(dm);// int width = bitmap.getScaledWidth(dm);int height = bitmap.getHeight();int width = bitmap.getWidth();float zoomScale;/** 方式1 **/// if(rWidth/rHeight>width/height){//以高为准// zoomScale=((float) rHeight) / height;// }else{// //if(rWidth/rHeight= height) {//以宽为准// if(width >= rWidth)// zoomScale = ((float) rWidth) / width;// else// zoomScale = 1.0f;// }else {//以高为准// if(height >= rHeight)// zoomScale = ((float) rHeight) / height;// else// zoomScale = 1.0f;// }/** 方式3 **/if (width >= rWidth)zoomScale = ((float) rWidth) / width;elsezoomScale = 1.0f;// 创建操作图片用的matrix对象Matrix matrix = new Matrix();// 缩放图片动作matrix.postScale(zoomScale, zoomScale);Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,bitmap.getWidth(), bitmap.getHeight(), matrix, true);return resizedBitmap;}/** * 将Drawable转化为Bitmap *  * @param drawable * @return */public static Bitmap drawableToBitmap(Drawable drawable) {int width = drawable.getIntrinsicWidth();int height = drawable.getIntrinsicHeight();Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565);Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, width, height);drawable.draw(canvas);return bitmap;}/** * 获得圆角图片的方法 *  * @param bitmap * @param roundPx *            一般设成14 * @return */public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {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);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;}/** * 获得带倒影的图片方法 *  * @param bitmap * @return */public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {final int reflectionGap = 4;int width = bitmap.getWidth();int height = bitmap.getHeight();Matrix matrix = new Matrix();matrix.preScale(1, -1);Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,width, height / 2, matrix, false);Bitmap bitmapWithReflection = Bitmap.createBitmap(width,(height + height / 2), Config.ARGB_8888);Canvas canvas = new Canvas(bitmapWithReflection);canvas.drawBitmap(bitmap, 0, 0, null);Paint deafalutPaint = new Paint();canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);Paint paint = new Paint();LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,0x00ffffff, TileMode.CLAMP);paint.setShader(shader);// Set the Transfer mode to be porter duff and destination inpaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));// Draw a rectangle using the paint with our linear gradientcanvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);return bitmapWithReflection;}/** * 将bitmap转化为drawable *  * @param bitmap * @return */public static Drawable bitmapToDrawable(Bitmap bitmap) {Drawable drawable = new BitmapDrawable(bitmap);return drawable;}/** * 获取图片类型 *  * @param file * @return */public static String getImageType(File file) {if (file == null || !file.exists()) {return null;}InputStream in = null;try {in = new FileInputStream(file);String type = getImageType(in);return type;} catch (IOException e) {return null;} finally {try {if (in != null) {in.close();}} catch (IOException e) {}}}/** * 获取图片的类型信息 *  * @param in * @return * @see #getImageType(byte[]) */public static String getImageType(InputStream in) {if (in == null) {return null;}try {byte[] bytes = new byte[8];in.read(bytes);return getImageType(bytes);} catch (IOException e) {return null;}}/** * 获取图片的类型信息 *  * @param bytes *            2~8 byte at beginning of the image file * @return image mimetype or null if the file is not image */public static String getImageType(byte[] bytes) {if (isJPEG(bytes)) {return "image/jpeg";}if (isGIF(bytes)) {return "image/gif";}if (isPNG(bytes)) {return "image/png";}if (isBMP(bytes)) {return "application/x-bmp";}return null;}private static boolean isJPEG(byte[] b) {if (b.length < 2) {return false;}return (b[0] == (byte) 0xFF) && (b[1] == (byte) 0xD8);}private static boolean isGIF(byte[] b) {if (b.length < 6) {return false;}return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8'&& (b[4] == '7' || b[4] == '9') && b[5] == 'a';}private static boolean isPNG(byte[] b) {if (b.length < 8) {return false;}return (b[0] == (byte) 137 && b[1] == (byte) 80 && b[2] == (byte) 78&& b[3] == (byte) 71 && b[4] == (byte) 13 && b[5] == (byte) 10&& b[6] == (byte) 26 && b[7] == (byte) 10);}private static boolean isBMP(byte[] b) {if (b.length < 2) {return false;}return (b[0] == 0x42) && (b[1] == 0x4d);}}
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