【发布时间】：2014-11-14 11:06:24
【问题描述】：
我正在使用以下代码进行图像压缩。
代码压缩大于 2 MB 的图像文件。
但此代码需要时间，而且图像质量保持纯净。
public static String compressImage(String imagePath, Context context)
{
String resizeImagePath = null;
String filePath = imagePath;
CustomLogHandler.printDebug(TAG, "resizeImagePath:" + imagePath);
Bitmap scaledBitmap = null;
int imageScal = 1;
// File size greater then 2mb
DecimalFormat df = new DecimalFormat("0.00");
File imgFile = new File(filePath);
double bytes = imgFile.length();
double kilobytes = (bytes / 1024);
double megabytes = (kilobytes / 1024);
AppConfig.makeLog(TAG, "image size in mb:" + df.format(megabytes), 0);
double filesize = Double.parseDouble(df.format(megabytes));
if (filesize > 2.00f)
{
for (int i = 0; i < filesize; i = i + 2)
{
imageScal++;
}
int remind = imageScal / 2;
if (remind != 0)
{
imageScal = imageScal + 1;
}
makeLog(TAG, "image scale:" + imageScal, 0);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
float maxHeight = 4000;
float maxWidth = 6000;
// float imgRatio = actualWidth / actualHeight;
// float maxRatio = maxWidth / maxHeight;
if (actualHeight > maxHeight)
{
imageScal = imageScal + 4;
}
if (actualWidth > maxWidth)
{
imageScal = imageScal + 8;
}
// if (actualHeight > maxHeight || actualWidth > maxWidth)
// {
// if (imgRatio < maxRatio)
// {
// imgRatio = maxHeight / actualHeight;
// actualWidth = (int) (imgRatio * actualWidth);
// actualHeight = (int) maxHeight;
//
// }
// else if (imgRatio > maxRatio)
// {
// imgRatio = maxWidth / actualWidth;
// actualHeight = (int) (imgRatio * actualHeight);
// actualWidth = (int) maxWidth;
// }
// else
// {
// actualHeight = (int) maxHeight;
// actualWidth = (int) maxWidth;
//
// }
// }
// options.inSampleSize = utils.calculateInSampleSize(options, actualWidth, actualHeight);
options.inSampleSize = imageScal;
options.inJustDecodeBounds = false;
options.inDither = true;
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try
{
bmp = BitmapFactory.decodeFile(filePath, options);
bmp = decodeFile(filePath);
}
catch (OutOfMemoryError exception)
{
exception.printStackTrace();
}
boolean done = false;
while (!done)
{
try
{
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888);
// scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888);
done = true;
}
catch (OutOfMemoryError exception)
{
// 15923 × 1790
// 5616 × 3744
// 8150 × 9154
actualWidth = actualWidth - ((actualWidth * 2) / 100);
actualHeight = actualHeight - ((actualHeight * 2) / 100);
// scaledBitmap = Bitmap.createBitmap(5616, 3744, Bitmap.Config.ARGB_8888);
exception.printStackTrace();
}
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
float middleX = actualWidth / 2.0f;
float middleY = actualHeight / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
// Resize image stored in sdcard
FileOutputStream out = null;
// filename =AppConfig.fileTosaveMedia(context, FileType.IMAGE, true).getAbsolutePath();
int compress = 50;
try
{
do
{
imgFile = AppConfig.fileTosaveMedia(context, FileType.IMAGE, true);
out = new FileOutputStream(imgFile);
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, compress, out);
resizeImagePath = imgFile.getAbsolutePath();
// Thread.sleep(15000);
// imgFile = new File(filename);
bytes = imgFile.length();
kilobytes = (bytes / 1024);
megabytes = (kilobytes / 1024);
System.out.println("resized image size in mb:" + df.format(megabytes));
filesize = Double.parseDouble(df.format(megabytes));
if (filesize > 2.00f)
{
compress = 30;
}
} while (filesize > 2.00f);
scaledBitmap.recycle();
}
catch (Exception e)
{
e.printStackTrace();
}
}
else
{
FileOutputStream out = null;
// FileInputStream in = null;
imgFile = AppConfig.fileTosaveMedia(context, FileType.IMAGE, true);
resizeImagePath = imgFile.getAbsolutePath();
InputStream in = null;
OutputStream outTemp = null;
try
{
// create output directory if it doesn't exist
in = new FileInputStream(filePath);
outTemp = new FileOutputStream(resizeImagePath);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1)
{
outTemp.write(buffer, 0, read);
}
in.close();
in = null;
// write the output file (You have now copied the file)
outTemp.flush();
outTemp.close();
outTemp = null;
}
catch (FileNotFoundException fnfe1)
{
Log.e("tag", fnfe1.getMessage());
}
catch (Exception e)
{
Log.e("tag", e.getMessage());
}
// try
// {
// Bitmap bmp = decodeFile(filePath);
// // in = new FileInputStream(new File(imagePath));
// // persistImage(bitmap, name);
// out = new FileOutputStream(resizeImagePath);
// bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
// out.flush();
// out.close();
// // FileIO.copyStream(in, out);
// }
// catch (Exception e)
// {
// e.printStackTrace();
// }
}
CustomLogHandler.printDebug(TAG, "resizeImagePath:" + resizeImagePath);
return resizeImagePath;
}
我花了很多时间在 Google 搜索和阅读博客上。然后在创建上面的代码之后，我找到了this。
上面的代码正确吗？或者有没有其他库可以用来压缩图片？
请帮帮我。
【问题讨论】：
标签： android compression