package com.hjy.http.upload.preprocessor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;
/**
* Created by hjy on 7/18/15.<br>
*/
public class ImagePreProcessor extends BasePreProcessor{
private File mCacheDir;
private int mMaxWidth;
private int mMaxHeight;
/**
*
* @param cacheDir 缓存目录
* @param maxWidth 图片最大宽度
* @param maxHeight 图片最大高度
*/
public ImagePreProcessor(File cacheDir, int maxWidth, int maxHeight) {
mCacheDir = cacheDir;
mMaxWidth = maxWidth;
mMaxHeight = maxHeight;
}
@Override
public String process(String filePath) {
return getSmallImg(filePath);
}
/**
* 处理大图
*
* @param file
* @return
*/
public String getSmallImg(String file) {
//处理图片小小
try {
if(!mCacheDir.exists()) {
mCacheDir.mkdirs();
}
File tmpFile = new File(mCacheDir, generatePhotoName());
String filePath = file;
//压缩图片
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
int sampleSize = computeSampleSize(options, Math.min(mMaxWidth, mMaxHeight), mMaxWidth * mMaxHeight);
options.inJustDecodeBounds = false;
options.inSampleSize = sampleSize;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
//处理图片旋转等问题
ExifInfo exifInfo = defineExifOrientation(filePath);
if (exifInfo.rotation != 0 || exifInfo.flipHorizontal) {
Matrix m = new Matrix();
// Flip bitmap if need
boolean flipHorizontal = exifInfo.flipHorizontal;
int rotation = exifInfo.rotation;
if (flipHorizontal) {
m.postScale(-1, 1);
}
// Rotate bitmap if need
if (rotation != 0) {
m.postRotate(rotation);
}
try {
Bitmap rotateBmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), m, true);
if(bmp != rotateBmp) {
bmp.recycle();
bmp = null;
}
bmp = rotateBmp;
} catch (OutOfMemoryError e) {
e.printStackTrace();
}
}
saveImageToFile(bmp, tmpFile);
if (bmp != null && !bmp.isRecycled())
bmp.recycle();
return tmpFile.getAbsolutePath();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 随机生成一个图片名字
*
* @return
*/
protected String generatePhotoName() {
String str = System.currentTimeMillis() + "-" + new Random().nextInt(1000);
return str;
}
/**
* 获取照片的旋转角度等信息
*
* @param file
* @return
*/
private static ExifInfo defineExifOrientation(String file) {
int rotation = 0;
boolean flip = false;
try {
ExifInterface exif = new ExifInterface(file);
int exifOrientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (exifOrientation) {
case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
flip = true;
case ExifInterface.ORIENTATION_NORMAL:
rotation = 0;
break;
case ExifInterface.ORIENTATION_TRANSVERSE:
flip = true;
case ExifInterface.ORIENTATION_ROTATE_90:
rotation = 90;
break;
case ExifInterface.ORIENTATION_FLIP_VERTICAL:
flip = true;
case ExifInterface.ORIENTATION_ROTATE_180:
rotation = 180;
break;
case ExifInterface.ORIENTATION_TRANSPOSE:
flip = true;
case ExifInterface.ORIENTATION_ROTATE_270:
rotation = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return new ExifInfo(rotation, flip);
}
/**
*
* 保存图片到文件
*
* @param bmp
* @param file
* @return true-保存成功
*/
private static boolean saveImageToFile(Bitmap bmp, File file) {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
return true;
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fos != null)
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
private static class ExifInfo {
public final int rotation;
public final boolean flipHorizontal;
protected ExifInfo() {
this.rotation = 0;
this.flipHorizontal = false;
}
protected ExifInfo(int rotation, boolean flipHorizontal) {
this.rotation = rotation;
this.flipHorizontal = flipHorizontal;
}
}
/**
*
* @param options
* @param minSideLength 最小宽或高
* @param maxNumOfPixels 最大像素
* @return
*/
public static int computeSampleSize(BitmapFactory.Options options,
int minSideLength, int maxNumOfPixels) {
int initialSize = computeInitialSampleSize(options, minSideLength,
maxNumOfPixels);
int roundedSize;
if (initialSize <= 8 ) {
roundedSize = 1;
while (roundedSize < initialSize) {
roundedSize <<= 1;
}
} else {
roundedSize = (initialSize + 7) / 8 * 8;
}
return roundedSize;
}
private static int computeInitialSampleSize(BitmapFactory.Options options,
int minSideLength, int maxNumOfPixels) {
double w = options.outWidth;
double h = options.outHeight;
int lowerBound = (maxNumOfPixels == -1) ? 1 :
(int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));
int upperBound = (minSideLength == -1) ? 128 :
(int) Math.min(Math.floor(w / minSideLength),
Math.floor(h / minSideLength));
if (upperBound < lowerBound) {
// return the larger one when there is no overlapping zone.
return lowerBound;
}
if ((maxNumOfPixels == -1) &&
(minSideLength == -1)) {
return 1;
} else if (minSideLength == -1) {
return lowerBound;
} else {
return upperBound;
}
}
}
