大图片文件压缩保存本地，返回本地url
16lz
2021-01-26
import android.app.ActivityManager;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.media.ExifInterface;import android.os.Build;import android.os.Environment;import android.support.v4.util.LruCache;import java.io.BufferedOutputStream;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import static android.media.ExifInterface.ORIENTATION_NORMAL;import static android.media.ExifInterface.ORIENTATION_ROTATE_180;import static android.media.ExifInterface.ORIENTATION_ROTATE_270;import static android.media.ExifInterface.ORIENTATION_ROTATE_90;import static android.media.ExifInterface.TAG_ORIENTATION;public class ImageFileUtils { private static final int widthPixels = 480; private static final int heightPixels = 800; private static final String PACKAGE_NAME = "com.neobear"; private static LruCache mAppBitmapCache = null; private static Context mContext; /** * 保存bitmap图片到本地 * * @param filePath * @param pathName * @param isClearWhenInit * @return */ public static String saveBitmap(Context context,String filePath, String pathName, boolean isClearWhenInit) { mContext = context; Bitmap bitmap = getBitmapWithPath(filePath); if (bitmap == null) { return ""; } String path = ""; if (isClearWhenInit) { path = getSharePicFile() + pathName; } else { path = getUploadPicFile() + pathName; } File file = new File(path); if (file.exists()) { return path; } ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos); int bitmapSize = baos.toByteArray().length / 2; Bitmap cacheBitmap = null; double imageSize = bitmapSize / 1024 / 1024; // 对可用内存进行判断，来决定压缩策略。。。。需要修改的 if (imageSize >= 1) { cacheBitmap = resizeImage(bitmap, 1080, path); } else { cacheBitmap = resizeImage(bitmap, path); } if (cacheBitmap == null) { path = ""; } if (cacheBitmap != null && !cacheBitmap.isRecycled()) { cacheBitmap.recycle(); } return path; } /** * 文件转换成bitmap * * @param path * @return */ private static Bitmap getBitmapWithPath(String path) { Bitmap bmp = null; try { bmp = ImageFileUtils.readNormalPic(path, widthPixels, heightPixels); } catch (OutOfMemoryError e) { getBitmapCache().evictAll(); try { bmp = ImageFileUtils.readNormalPic(path, widthPixels, heightPixels); } catch (OutOfMemoryError e2) { } } return bmp; } private static Bitmap readNormalPic(String filePath, int reqWidth, int reqHeight) { try { if (!isExternalStorageMounted()) { return null; } if (!filePath.endsWith(".jpg") && !filePath.endsWith(".gif") && !filePath.endsWith(".png") && !filePath.endsWith(".jpeg")) filePath = filePath + ".jpg"; boolean fileExist = new File(filePath).exists(); if (!fileExist) { return null; } BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(filePath, options); if (reqHeight > 0 && reqWidth > 0) options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); options.inJustDecodeBounds = false; options.inPurgeable = true; options.inInputShareable = true; Bitmap bitmap = BitmapFactory.decodeFile(filePath, options); if (bitmap == null) { // this picture is broken,so delete it new File(filePath).delete(); return null; } if (reqHeight > 0 && reqWidth > 0) { int[] size = calcResize(bitmap.getWidth(), bitmap.getHeight(), reqWidth, reqHeight); if (size[0] > 0 && size[1] > 0) { Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, size[0], size[1], true); if (scaledBitmap != bitmap) { bitmap.recycle(); bitmap = scaledBitmap; } } } int exifRotation = ImageFileUtils.getFileExifRotation(filePath); if (exifRotation != 0) { Matrix mtx = new Matrix(); mtx.postRotate(exifRotation); Bitmap adjustedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), mtx, true); if (adjustedBitmap != bitmap) { bitmap.recycle(); bitmap = adjustedBitmap; } } return bitmap; } catch (OutOfMemoryError ignored) { ignored.printStackTrace(); return null; } } private static synchronized LruCache getBitmapCache() { if (mAppBitmapCache == null) { buildCache(); } return mAppBitmapCache; } private static void buildCache() { int memClass = ((ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass(); int cacheSize = Math.max(1024 * 1024 * 8, 1024 * 1024 * memClass / 6); mAppBitmapCache = new LruCache(cacheSize) { @Override protected int sizeOf(String key, Bitmap bitmap) { return bitmap.getRowBytes() * bitmap.getHeight(); } }; } private static boolean isExternalStorageMounted() { boolean canRead = Environment.getExternalStorageDirectory().canRead(); boolean onlyRead = Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED_READ_ONLY); boolean unMounted = Environment.getExternalStorageState().equals( Environment.MEDIA_UNMOUNTED); return !(!canRead || onlyRead || unMounted); } private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { if (height > reqHeight && reqHeight != 0) { inSampleSize = (int) Math.floor((double) height / (double) reqHeight); } int tmp = 0; if (width > reqWidth && reqWidth != 0) { tmp = (int) Math.floor((double) width / (double) reqWidth); } inSampleSize = Math.max(inSampleSize, tmp); } int roundedSize; if (inSampleSize <= 8) { roundedSize = 1; while (roundedSize < inSampleSize) { roundedSize <<= 1; } } else { roundedSize = (inSampleSize + 7) / 8 * 8; } return roundedSize; } private static int[] calcResize(int actualWidth, int actualHeight, int reqWidth, int reqHeight) { int height = actualHeight; int width = actualWidth; float betweenWidth = ((float) reqWidth) / (float) actualWidth; float betweenHeight = ((float) reqHeight) / (float) actualHeight; float min = Math.min(betweenHeight, betweenWidth); height = (int) (min * actualHeight); width = (int) (min * actualWidth); return new int[]{width, height}; } private static int getFileExifRotation(String filePath) { try { ExifInterface exifInterface = new ExifInterface(filePath); int orientation = exifInterface.getAttributeInt(TAG_ORIENTATION, ORIENTATION_NORMAL); switch (orientation) { case ORIENTATION_ROTATE_90: return 90; case ORIENTATION_ROTATE_180: return 180; case ORIENTATION_ROTATE_270: return 270; default: return 0; } } catch (IOException e) { return 0; } } private static String getSharePicFile() { return sdCardIsExist() ? getSDAccessPath() + "/file/share/" : "/data/data/" + PACKAGE_NAME + "/files/share/"; } private static String getUploadPicFile() { return sdCardIsExist() ? getSDAccessPath() + "/file/" : "/data/data/" + PACKAGE_NAME + "/files/"; } /** * 判断sdCard的状态 * * @author zhangbp */ private static boolean sdCardIsExist() { return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); } /** * 读取sdCard的路径 * * @author zhangbp */ private static String getSDAccessPath() { if (sdCardIsExist()) { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) { return Environment.getExternalStorageDirectory().getPath() + "/data/" + PACKAGE_NAME; } else { return mContext.getExternalCacheDir() + ""; } } return null; } private static Bitmap resizeImage(Bitmap bitmap, int w, String filePath) { Bitmap BitmapOrg = bitmap; int width = BitmapOrg.getWidth(); int height = BitmapOrg.getHeight(); int newWidth = 0; int newHeight = 0; if (width > height) { newWidth = w; newHeight = (int) (((float) height) / width * w); } else { newWidth = (int) (((float) width) / height * w); newHeight = w; } // calculate the scale float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; // create a matrix for the manipulation Matrix matrix = new Matrix(); // resize the Bitmap matrix.postScale(scaleWidth, scaleHeight); // if you want to rotate the Bitmap // matrix.postRotate(readPictureDegree(filePath)); // recreate the new Bitmap Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, matrix, true); resizedBitmap = compressImage(resizedBitmap, filePath); return resizedBitmap; } private static Bitmap resizeImage(Bitmap bitmap, String filePath) { Bitmap BitmapOrg = bitmap; int width = BitmapOrg.getWidth(); int height = BitmapOrg.getHeight(); Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, null, true); resizedBitmap = compressImage(resizedBitmap, filePath); return resizedBitmap; } private static Bitmap compressImage(Bitmap image, String filePath) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 80, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 int options = 100; while (baos.toByteArray().length / 1024 > 80) { // 循环判断如果压缩后图片是否大于100kb,大于继续压缩 if (options >= 10) { baos.reset();// 重置baos即清空baos image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中 options -= 10;// 每次都减少10 } else { break; } } ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); final BitmapFactory.Options ops = new BitmapFactory.Options(); ops.inJustDecodeBounds = false; ops.inPreferredConfig = Bitmap.Config.ARGB_8888; ops.inPurgeable = true;//允许可清除 ops.inInputShareable = true;// 以上options的两个属性必须联合使用才会有效果 Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片 try { createFile(filePath); File file = new File(filePath); BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(file)); bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos); bos.flush(); bos.close(); } catch (Exception e) { e.printStackTrace(); return null; } if (image != null && !image.isRecycled()) { image.recycle(); } return bitmap; } private static boolean createFile(String destFileName) { File file = new File(destFileName); if (!file.getParentFile().exists()) { // 如果目标文件所在的目录不存在，则创建父目录 if (!file.getParentFile().mkdirs()) { return false; } } if (destFileName.endsWith(File.separator)) { return false; } // 判断目标文件所在的目录是否存在 // 创建目标文件 if (file.exists()) { return true; } try { return file.createNewFile(); } catch (IOException e) { e.printStackTrace(); return false; } }} 使用
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