Options options1 = new Options();
options1.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options1);
options1.inSampleSize = RegisterTool.calculateInSampleSize(options1, 110, 160); //110,160：转换后的宽和高，具体值会有些出入
options1.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeFile(filePath, options1); //filePath:文件路径
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? widthRatio : heightRatio;
}
return inSampleSize;
}
//压缩图片并将Bitmap保存到本地
FileOutputStream out = new FileOutputStream(new File(filePath));
press(pressFormat.JPEG, 60, out); //60代表压缩40%
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