package com.moral.andbrickslib.compresshelper;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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import android.graphics.Matrix;
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import android.graphics.Paint;
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import android.media.ExifInterface;
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import android.net.Uri;
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import android.text.TextUtils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* 图片处理工具类
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*
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* Author: nanchen
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* Email: liushilin520@foxmail.com
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* Date: 2017-03-08 9:03
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*/
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public class ImageUtil {
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private ImageUtil() {
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throw new UnsupportedOperationException("u can't instantiate me...");
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}
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static Bitmap getScaledBitmap(Context context, Uri imageUri, float maxWidth, float maxHeight, Bitmap.Config bitmapConfig) {
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String filePath = FileUtil.getRealPathFromURI(context, imageUri);
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Bitmap scaledBitmap = null;
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BitmapFactory.Options options = new BitmapFactory.Options();
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//by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If
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//you try the use the bitmap here, you will get null.
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options.inJustDecodeBounds = true;
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Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
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if (bmp == null) {
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InputStream inputStream = null;
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try {
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inputStream = new FileInputStream(filePath);
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BitmapFactory.decodeStream(inputStream, null, options);
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inputStream.close();
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} catch (FileNotFoundException exception) {
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exception.printStackTrace();
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} catch (IOException exception) {
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exception.printStackTrace();
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}
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}
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int actualHeight = options.outHeight;
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int actualWidth = options.outWidth;
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if (actualHeight == -1 || actualWidth == -1){
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try {
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ExifInterface exifInterface = new ExifInterface(filePath);
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actualHeight = exifInterface.getAttributeInt(ExifInterface.TAG_IMAGE_LENGTH, ExifInterface.ORIENTATION_NORMAL);//获取图片的高度
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actualWidth = exifInterface.getAttributeInt(ExifInterface.TAG_IMAGE_WIDTH, ExifInterface.ORIENTATION_NORMAL);//获取图片的宽度
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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if (actualWidth < 0 || actualHeight < 0) {
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Bitmap bitmap2 = BitmapFactory.decodeFile(filePath);
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if (bitmap2 != null){
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actualWidth = bitmap2.getWidth();
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actualHeight = bitmap2.getHeight();
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}else{
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return null;
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}
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}
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float imgRatio = (float) actualWidth / actualHeight;
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float maxRatio = maxWidth / maxHeight;
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//width and height values are set maintaining the aspect ratio of the image
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if (actualHeight > maxHeight || actualWidth > maxWidth) {
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if (imgRatio < maxRatio) {
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imgRatio = maxHeight / actualHeight;
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actualWidth = (int) (imgRatio * actualWidth);
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actualHeight = (int) maxHeight;
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} else if (imgRatio > maxRatio) {
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imgRatio = maxWidth / actualWidth;
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actualHeight = (int) (imgRatio * actualHeight);
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actualWidth = (int) maxWidth;
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} else {
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actualHeight = (int) maxHeight;
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actualWidth = (int) maxWidth;
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}
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}
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//setting inSampleSize value allows to load a scaled down version of the original image
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options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
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//inJustDecodeBounds set to false to load the actual bitmap
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options.inJustDecodeBounds = false;
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//this options allow android to claim the bitmap memory if it runs low on memory
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options.inPurgeable = true;
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options.inInputShareable = true;
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options.inTempStorage = new byte[16 * 1024];
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try {
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//load the bitmap getTempFile its path
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bmp = BitmapFactory.decodeFile(filePath, options);
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if (bmp == null) {
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InputStream inputStream = null;
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try {
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inputStream = new FileInputStream(filePath);
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BitmapFactory.decodeStream(inputStream, null, options);
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inputStream.close();
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} catch (FileNotFoundException exception) {
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exception.printStackTrace();
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} catch (IOException exception) {
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exception.printStackTrace();
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}
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}
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} catch (OutOfMemoryError exception) {
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exception.printStackTrace();
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}
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try {
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scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, bitmapConfig);
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} catch (OutOfMemoryError exception) {
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exception.printStackTrace();
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}
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float ratioX = actualWidth / (float) options.outWidth;
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float ratioY = actualHeight / (float) options.outHeight;
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Matrix scaleMatrix = new Matrix();
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scaleMatrix.setScale(ratioX, ratioY, 0, 0);
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Canvas canvas = new Canvas(scaledBitmap);
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canvas.setMatrix(scaleMatrix);
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canvas.drawBitmap(bmp, 0, 0, new Paint(Paint.FILTER_BITMAP_FLAG));
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//check the rotation of the image and display it properly
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ExifInterface exif;
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try {
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exif = new ExifInterface(filePath);
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int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
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Matrix matrix = new Matrix();
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if (orientation == 6) {
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matrix.postRotate(90);
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} else if (orientation == 3) {
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matrix.postRotate(180);
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} else if (orientation == 8) {
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matrix.postRotate(270);
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}
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scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
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scaledBitmap.getWidth(), scaledBitmap.getHeight(),
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matrix, true);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return scaledBitmap;
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}
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static File compressImage(Context context, Uri imageUri, float maxWidth, float maxHeight,
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Bitmap.CompressFormat compressFormat, Bitmap.Config bitmapConfig,
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int quality, String parentPath, String prefix, String fileName) {
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FileOutputStream out = null;
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String filename = generateFilePath(context, parentPath, imageUri, compressFormat.name().toLowerCase(), prefix, fileName);
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try {
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out = new FileOutputStream(filename);
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//write the compressed bitmap at the destination specified by filename.
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ImageUtil.getScaledBitmap(context, imageUri, maxWidth, maxHeight, bitmapConfig).compress(compressFormat, quality, out);
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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} finally {
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try {
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if (out != null) {
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out.close();
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}
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} catch (IOException ignored) {
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}
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}
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return new File(filename);
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}
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private static String generateFilePath(Context context, String parentPath, Uri uri,
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String extension, String prefix, String fileName) {
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File file = new File(parentPath);
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if (!file.exists()) {
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file.mkdirs();
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}
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/** if prefix is null, set prefix "" */
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prefix = TextUtils.isEmpty(prefix) ? "" : prefix;
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/** reset fileName by prefix and custom file name */
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fileName = TextUtils.isEmpty(fileName) ? prefix + FileUtil.splitFileName(FileUtil.getFileName(context, uri))[0] : fileName;
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return file.getAbsolutePath() + File.separator + fileName + "." + extension;
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}
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/**
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* 计算inSampleSize
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*/
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private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
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final int height = options.outHeight;
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final int width = options.outWidth;
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int inSampleSize = 1;
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if (height > reqHeight || width > reqWidth) {
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final int heightRatio = Math.round((float) height / (float) reqHeight);
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final int widthRatio = Math.round((float) width / (float) reqWidth);
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inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
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}
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final float totalPixels = width * height;
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final float totalReqPixelsCap = reqWidth * reqHeight * 2;
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while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
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inSampleSize++;
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}
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return inSampleSize;
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}
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}
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