我使用这个函数将位图保存到SD卡上的文件:
private static File storeImage(Context context, Bitmap image) {
File pictureFile = getOutputMediaFile(context);
if (pictureFile == null) {
return null;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
image.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return pictureFile;
}
private static File getOutputMediaFile(Context context){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStorageDirectory()
+ "/Android/data/"
+ context.getPackageName()
+ "/Files");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.ENGLISH).format(new Date());
File mediaFile;
String mImageName="IMG_"+ timeStamp +".png";
mediaFile = new File(mediaStorageDir.getPath() + File.separator + mImageName);
return mediaFile;
}
当我打开文件并查看图像DPI信息时,它显示为72像素/英寸(如图所示)
我该如何将其设置为300像素/英寸或其他值?