Android应用中实现图片压缩的方法有哪些

public class Utils {       public static Bitmap getBitmap(Bitmap bitmap, int sampleSize) {     BitmapFactory.Options options = new BitmapFactory.Options();     options.inSampleSize = sampleSize;     ByteArrayOutputStream baos = new ByteArrayOutputStream();     bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);     byte[] bytes = baos.toByteArray();     Bitmap bit = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, options);     Log.i("info", "图片大小：" + bit.getByteCount());//2665296  10661184     return bit;   }       public static Bitmap compressByQuality(Bitmap bitmap, int quality) {     ByteArrayOutputStream baos = new ByteArrayOutputStream();     bitmap.compress(Bitmap.CompressFormat.JPEG, quality, baos);     byte[] bytes = baos.toByteArray();     Bitmap bit = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);     Log.i("info", "图片大小：" + bit.getByteCount());//10661184     return bit;   }       public static Bitmap compressByQuality(Bitmap src, long maxByteSize) {     ByteArrayOutputStream baos = new ByteArrayOutputStream();     int quality = 100;     src.compress(Bitmap.CompressFormat.JPEG, quality, baos);     while (baos.toByteArray().length > maxByteSize && quality > 0) {       baos.reset();       src.compress(Bitmap.CompressFormat.JPEG, quality -= 5, baos);     }     if (quality < 0) return null;     byte[] bytes = baos.toByteArray();     Bitmap bit = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);     return bit;   }    public static Bitmap compressByFormat(Bitmap bitmap, int format) {     ByteArrayOutputStream baos = new ByteArrayOutputStream();     bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);     byte[] bytes = baos.toByteArray();     Bitmap bit = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);     Log.i("info", "图片大小：" + bit.getByteCount());//10661184     return bit;   }       public static Bitmap getBitmapBySize(Bitmap bitmap, float scaleWidth, float scaleHeight) {     Matrix matrix = new Matrix();     matrix.postScale(scaleWidth, scaleHeight);     Bitmap bit = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, false);     Log.i("info", "图片大小：" + bit.getByteCount());     return bit;   }       public static Bitmap getBitmapByFormatConfig(String path, Bitmap.Config config) {     BitmapFactory.Options options = new BitmapFactory.Options();     options.inPreferredConfig = config;     Bitmap bitmap = BitmapFactory.decodeFile(path, options);     Log.i("info", "图片大小：" + bitmap.getByteCount());     return bitmap;   }       public static Bitmap getBitmapByScaleSize(Bitmap bitmap, int width, int height) {     Bitmap bit = Bitmap.createScaledBitmap(bitmap, width, height, true);     Log.i("info", "图片大小：" + bit.getByteCount());     return bit;   }       public static Bitmap getBitmapByFormat(Bitmap bitmap, Bitmap.CompressFormat format) {     ByteArrayOutputStream baos = new ByteArrayOutputStream();     bitmap.compress(format, 100, baos);     byte[] bytes = baos.toByteArray();     Bitmap bit = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);     Log.i("info", "图片大小：" + bit.getByteCount());     return bit;   }       public static Bitmap getBitmap(String filePath, int inSampleSize) {     BitmapFactory.Options options = new BitmapFactory.Options();     options.inJustDecodeBounds = true;     BitmapFactory.decodeFile(filePath, options);//此时不耗费和占用内存     options.inSampleSize = inSampleSize;     options.inJustDecodeBounds = false;     return BitmapFactory.decodeFile(filePath, options);   }    public static Bitmap getBitmap(String filePath) {     return BitmapFactory.decodeFile(filePath);   }    public static Bitmap view2Bitmap(View view) {     if (view == null) return null;     Bitmap ret = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);     Canvas canvas = new Canvas(ret);     Drawable bgDrawable = view.getBackground();     if (bgDrawable != null) {       bgDrawable.draw(canvas);     } else {       canvas.drawColor(Color.WHITE);     }     view.draw(canvas);     return ret;   }    public static void saveBitmap(Bitmap bitmap) {     File file = new File(Environment.getExternalStorageDirectory() + "/img.jpg");     try {       FileOutputStream fileOutputStream = new FileOutputStream(file);       bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);       fileOutputStream.flush();       fileOutputStream.close();     } catch (FileNotFoundException e) {       e.printStackTrace();     } catch (IOException e) {       e.printStackTrace();     }   }    public static void saveBitmap(Bitmap bitmap,Bitmap.CompressFormat format) {     File file = new File(Environment.getExternalStorageDirectory() + "/img.jpg");     try {       FileOutputStream fileOutputStream = new FileOutputStream(file);       bitmap.compress(format, 100, fileOutputStream);       fileOutputStream.flush();       fileOutputStream.close();     } catch (FileNotFoundException e) {       e.printStackTrace();     } catch (IOException e) {       e.printStackTrace();     }   } }