本文介绍了一种实用的方法来计算图片缩放比例并实现图片的缩放及保存。通过自定义的Java类，可以有效地调整图片尺寸，并将处理后的图片保存到本地。文章详细展示了如何使用Matrix进行缩放操作以及如何将Bitmap格式的图片转换为JPG文件并存储。
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public class ImageThumbnail {
public static int reckonThumbnail(int oldWidth, int oldHeight,
int newWidth, int newHeight) {
if ((oldHeight > newHeight && oldWidth > newWidth)
|| (oldHeight <= newHeight && oldWidth > newWidth)) {
int be = (int) (oldWidth / (float) newWidth);
if (be <= 1)
be = 1;
return be;
} else if (oldHeight > newHeight && oldWidth <= newWidth) {
int be = (int) (oldHeight / (float) newHeight);
if (be <= 1)
be = 1;
return be;
}
return 1;
}
public static Bitmap PicZoom(Bitmap bmp, int width, int height) {
int bmpWidth = bmp.getWidth();
int bmpHeght = bmp.getHeight();
Matrix matrix = new Matrix();
matrix.postScale((float) width / bmpWidth, (float) height / bmpHeght);
return Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeght, matrix, true);
}
public static String savaPhotoToLocal(Intent data, Bitmap btp) {
// 如果文件夹不存在则创建文件夹，并将bitmap图像文件保存
String filename = System.currentTimeMillis() + ".jpg";
File tempFile = new File(SgsCons.ROOT_DIR, filename);
String filePath = tempFile.getAbsolutePath();
try {
// 将bitmap转为jpg文件保存
FileOutputStream fileOut = new FileOutputStream(tempFile);
btp.compress(CompressFormat.JPEG, 100, fileOut);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return filePath;
}
}
public class ImageThumbnail {
public static int reckonThumbnail(int oldWidth, int oldHeight,
int newWidth, int newHeight) {
if ((oldHeight > newHeight && oldWidth > newWidth)
|| (oldHeight <= newHeight && oldWidth > newWidth)) {
int be = (int) (oldWidth / (float) newWidth);
if (be <= 1)
be = 1;
return be;
} else if (oldHeight > newHeight && oldWidth <= newWidth) {
int be = (int) (oldHeight / (float) newHeight);
if (be <= 1)
be = 1;
return be;
}
return 1;
}
public static Bitmap PicZoom(Bitmap bmp, int width, int height) {
int bmpWidth = bmp.getWidth();
int bmpHeght = bmp.getHeight();
Matrix matrix = new Matrix();
matrix.postScale((float) width / bmpWidth, (float) height / bmpHeght);
return Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeght, matrix, true);
}
public static String savaPhotoToLocal(Intent data, Bitmap btp) {
// 如果文件夹不存在则创建文件夹，并将bitmap图像文件保存
String filename = System.currentTimeMillis() + ".jpg";
File tempFile = new File(SgsCons.ROOT_DIR, filename);
String filePath = tempFile.getAbsolutePath();
try {
// 将bitmap转为jpg文件保存
FileOutputStream fileOut = new FileOutputStream(tempFile);
btp.compress(CompressFormat.JPEG, 100, fileOut);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return filePath;
}
}
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