/**
* <图片按比例大小压缩方法（根据路径获取图片并压缩）>
*
* @return 压缩后图片路径
*/
public static String getImageScaleByPath(PicturePropertiesBean propertiesBean, Context context) {
Bitmap bitmap = null;
BitmapFactory.Options newOpts = new BitmapFactory.Options();
// 开始读入图片，此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds = true;
bitmap = BitmapFactory.decodeFile(propertiesBean.getSrcPath(), newOpts);
int width = newOpts.outWidth;
int height = newOpts.outHeight;
// float minHeight = 800f;//设置为主流手机分辨率800*480
// 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
int be = 1; // be=1表示不缩放
if (height > width && width > propertiesBean.getWidth()) {
// 如果宽度大的话根据宽度固定大小缩放
be = (int) (newOpts.outWidth / propertiesBean.getWidth());
} else if (width > height && height > propertiesBean.getHeight()) {
// 如果高度高的话根据宽度固定大小缩放
be = (int) (newOpts.outHeight / propertiesBean.getHeight());
}
if (be <= 0) be = 1;
newOpts.inSampleSize = be; // 设置缩放比例
newOpts.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(propertiesBean.getSrcPath(), newOpts);
return compressImage(bitmap, context, propertiesBean); // 压缩好比例大小后再进行质量压缩
}
/**
* <质量压缩方法>
*
* @return 压缩后图片路径
*/
private static String compressImage(
Bitmap image, Context context, PicturePropertiesBean propertiesBean) {
File file = null;
if (image != null) {
try {
int degree = getExifOrientation(propertiesBean.getSrcPath());
if (degree > 0) {
Matrix matrix = new Matrix();
matrix.setRotate(degree);
Bitmap rotateBitmap =
Bitmap.createBitmap(image, 0, 0, image.getWidth(), image.getHeight(), matrix, true);
if (rotateBitmap != null) {
image.recycle();
image = rotateBitmap;
}
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
// 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
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
// 图片大于最大值,则压缩,否则不做任何操作
if (baos.toByteArray().length > propertiesBean.getMaxSize()) {
baos.reset();
// 质量压缩方法，首先压缩options的压缩率
image.compress(Bitmap.CompressFormat.JPEG, propertiesBean.getDefaultOption(), baos);
// 循环判断如果压缩后图片是否大于200kb,大于继续压缩
while (baos.toByteArray().length > propertiesBean.getMaxSize()) {
baos.reset(); // 重置baos即清空baos
// 这里压缩defaultOptions%，把压缩后的数据存放到baos中
propertiesBean.setDefaultOption(
propertiesBean.getDefaultOption() - propertiesBean.getOptions()); // 每次都减少option
image.compress(Bitmap.CompressFormat.JPEG, propertiesBean.getDefaultOption(), baos);
}
while (baos.toByteArray().length < propertiesBean.getMinSize()) {
baos.reset(); // 重置baos即清空baos
// 这里压缩options%，把压缩后的数据存放到baos中
propertiesBean.setDefaultOption(
propertiesBean.getDefaultOption() + propertiesBean.getOptions()); // 每次都增加option
image.compress(Bitmap.CompressFormat.JPEG, propertiesBean.getDefaultOption(), baos);
}
}
file = new File(propertiesBean.getDestPath());
FileOutputStream stream = new FileOutputStream(file);
if (baos != null) {
stream.write(baos.toByteArray());
stream.flush();
}
stream.close();
baos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (image != null) image.recycle();
}
return file.getPath();
} else {
return "";
}
}
