我用android相机拍了照片.结果是一个字节数组.我通过在sdcard(FileOutputStream)上写它来保存它.结果是文件大小接近3mb的图像.我想减少这个文件大小,所以压缩图像.
如果可以在将字节数组写入输出流之前减少文件大小,那将是很好的.这可能还是我必须先保存?
解决方法:
我通常调整图像大小,减小它的大小
Bitmap bitmap = resizeBitMapImage1(exsistingFileName, 800, 600);
您还可以使用此代码压缩图像
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
_bitmapScaled.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()
+ File.separator + "test.jpg")
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
// remember close de FileOutput
fo.close();
重新调整代码大小
public static Bitmap resizeBitMapImage1(String filePath, int targetWidth, int targetHeight) {
Bitmap bitMapImage = null;
try {
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
double sampleSize = 0;
Boolean scaleByHeight = Math.abs(options.outHeight - targetHeight) >= Math.abs(options.outWidth
- targetWidth);
if (options.outHeight * options.outWidth * 2 >= 1638) {
sampleSize = scaleByHeight ? options.outHeight / targetHeight : options.outWidth / targetWidth;
sampleSize = (int) Math.pow(2d, Math.floor(Math.log(sampleSize) / Math.log(2d)));
}
options.inJustDecodeBounds = false;
options.inTempStorage = new byte[128];
while (true) {
try {
options.inSampleSize = (int) sampleSize;
bitMapImage = BitmapFactory.decodeFile(filePath, options);
break;
} catch (Exception ex) {
try {
sampleSize = sampleSize * 2;
} catch (Exception ex1) {
}
}
}
} catch (Exception ex) {
}
return bitMapImage;
}