我正在使用原生Android相机并将文件保存到我的应用程序数据文件夹（/mnt/sdcard/Android/data/com.company.app/files/Pictures/）。同时，其他照片副本保存到DCIM文件夹。
这是我的代码：
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String formattedImageName = getDateString() + ".jpg";
File image_file = new File(this.getExternalFilesDir(Environment.DIRECTORY_PICTURES), formattedImageName);
Uri imageUri = Uri.fromFile(image_file);
intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
startActivityForResult(intent, REQUEST_FROM_CAMERA);
如何防止将其他图像副本保存到DCIM文件夹？
非常感谢
答案 0 :(得分：7)
您可以使用以下内容： 首先，我们通过检查哪个是最后修改的图像来获取最后保存的图像。然后检查上次修改时间是否在最后几秒内。您可能还需要检查相机存储图像的位置的确切位置。
private boolean deleteLastFromDCIM() {
boolean success = false;
try {
File[] images = new File(Environment.getExternalStorageDirectory()
+ File.separator + "DCIM/Camera").listFiles();
File latestSavedImage = images[0];
for (int i = 1; i < images.length; ++i) {
if (images[i].lastModified() > latestSavedImage.lastModified()) {
latestSavedImage = images[i];
}
}
// OR JUST Use success = latestSavedImage.delete();
success = new File(Environment.getExternalStorageDirectory()
+ File.separator + "DCIM/Camera/"
+ latestSavedImage.getAbsoluteFile()).delete();
return success;
} catch (Exception e) {
e.printStackTrace();
return success;
}
}
答案 1 :(得分：6)
不幸的是，一些智能手机将图像保存在另一个文件夹中，例如DCIM / 100MEDIA。所以不能依赖这些解决方案。我更喜欢用这种方式：
String[] projection = new String[] {
MediaStore.Images.ImageColumns._ID,
MediaStore.Images.ImageColumns.DATA,
MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,
MediaStore.Images.ImageColumns.DATE_TAKEN,
MediaStore.Images.ImageColumns.MIME_TYPE};
final Cursor cursor = managedQuery(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,projection, null, null,
MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC");
if(cursor != null){
cursor.moveToFirst();
// you will find the last taken picture here and can delete that
}
我试图找出是否存在第二份副本并删除副本。我使用上面的代码找到最后拍摄的照片。
注意：使用 managedQuery 后请勿使用cursor.close();，请将光标留给Android系统进行管理，不要调用它。您可以看到managedQuery()
注意2：不推荐使用managedQuery方法，应该避免使用它，实现 CursorLoaders 。
答案 2 :(得分：4)
检查此代码..
private void FillPhotoList() {
// initialize the list!
GalleryList.clear();
String[] projection = { MediaStore.Images.ImageColumns.DISPLAY_NAME };
for(int i=0;i<projection.length;i++)
Log.i("InfoLog","projection "+projection[0].toString());
// intialize the Uri and the Cursor, and the current expected size.
Cursor c = null;
Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
Log.i("InfoLog","FillPhoto Uri u "+u.toString());
// Query the Uri to get the data path. Only if the Uri is valid.
if (u != null)
{
c = managedQuery(u, projection, null, null, null);
}
// If we found the cursor and found a record in it (we also have the id).
if ((c != null) && (c.moveToFirst()))
{
do
{
// Loop each and add to the list.
GalleryList.add(c.getString(0)); // adding all the images sotred in the mobile phone(Internal and SD card)
}
while (c.moveToNext());
}
Log.i(INFOLOG,"gallery size "+ GalleryList.size());
}
，这就是该方法正在做的所有魔法
/** Method will check all the photo is the gallery and delete last captured and move it to the required folder.
*/
public void movingCapturedImageFromDCIMtoMerchandising()
{
// This is ##### ridiculous. Some versions of Android save
// to the MediaStore as well. Not sure why! We don't know what
// name Android will give either, so we get to search for this
// manually and remove it.
String[] projection = { MediaStore.Images.ImageColumns.SIZE,
MediaStore.Images.ImageColumns.DISPLAY_NAME,
MediaStore.Images.ImageColumns.DATA,
BaseColumns._ID,};
// intialize the Uri and the Cursor, and the current expected size.
for(int i=0;i<projection.length;i++)
Log.i("InfoLog","on activityresult projection "+projection[i]);
//+" "+projection[1]+" "+projection[2]+" "+projection[3] this will be needed if u remove the for loop
Cursor c = null;
Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
Log.i("InfoLog","on activityresult Uri u "+u.toString());
if (CurrentFile != null)
{
// Query the Uri to get the data path. Only if the Uri is valid,
// and we had a valid size to be searching for.
if ((u != null) && (CurrentFile.length() > 0))
{
//****u is the place from data will come and projection is the specified data what we want
c = managedQuery(u, projection, null, null, null);
}
// If we found the cursor and found a record in it (we also have the size).
if ((c != null) && (c.moveToFirst()))
{
do
{
// Check each area in the gallery we built before.
boolean bFound = false;
for (String sGallery : GalleryList)
{
if (sGallery.equalsIgnoreCase(c.getString(1)))
{
bFound = true;
Log.i("InfoLog","c.getString(1) "+c.getString(1));
break;
}
}
// To here we looped the full gallery.
if (!bFound) //the file which is newly created and it has to be deleted from the gallery
{
// This is the NEW image. If the size is bigger, copy it.
// Then delete it!
File f = new File(c.getString(2));
// Ensure it's there, check size, and delete!
if ((f.exists()) && (CurrentFile.length() < c.getLong(0)) && (CurrentFile.delete()))
{
// Finally we can stop the copy.
try
{
CurrentFile.createNewFile();
FileChannel source = null;
FileChannel destination = null;
try
{
source = new FileInputStream(f).getChannel();
destination = new FileOutputStream(CurrentFile).getChannel();
destination.transferFrom(source, 0, source.size());
}
finally
{
if (source != null)
{
source.close();
}
if (destination != null)
{
destination.close();
}
}
}
catch (IOException e)
{
// Could not copy the file over.
ToastMaker.makeToast(this, "Error Occured", 0);
}
}
//****deleting the file which is in the gallery
Log.i(INFOLOG,"imagePreORNext1 "+imagePreORNext);
Handler handler = new Handler();
//handler.postDelayed(runnable,300);
Log.i(INFOLOG,"imagePreORNext2 "+imagePreORNext);
ContentResolver cr = getContentResolver();
cr.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, BaseColumns._ID + "=" + c.getString(3), null);
break;
}
}
while (c.moveToNext());
}
}
}
答案 3 :(得分：3)
Parth的一个很好的解决方案。但对于将图像保存在DCIM /相机中的三星来说这是件好事。有些手机 - 索尼爱立信，HTC将它们保存在像DCIM / 100MEDIA，DCIM / 100ANDRO这样的文件夹中，所以我稍微修改了代码：
private boolean deleteLastFromDCIM() {
boolean success = false;
try {
//Samsungs:
File folder = new File(Environment.getExternalStorageDirectory() + File.separator + "DCIM/Camera");
if(!folder.exists()){ //other phones:
File[] subfolders = new File(Environment.getExternalStorageDirectory() + File.separator + "DCIM").listFiles();
for(File subfolder : subfolders){
if(subfolder.getAbsolutePath().contains("100")){
folder = subfolder;
break;
}
}
if(!folder.exists())
return false;
}
File[] images = folder.listFiles();
File latestSavedImage = images[0];
for (int i = 1; i < images.length; ++i) {
if (images[i].lastModified() > latestSavedImage.lastModified()) {
latestSavedImage = images[i];
}
}
success = latestSavedImage.delete();
return success;
} catch (Exception e) {
e.printStackTrace();
return success;
}
}
答案 4 :(得分：0)
我在Moto Z Force（7.1.1）上遇到了类似的问题。我在意图上定义了MediaStore.EXTRA_OUTPUT，但是在相机目录中仍然创建了重复文件。
我需要在其他设备上进行测试，但这是我针对此问题采取的一种方法。我使用的是MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME位置，而不是尝试查找特定的相机目录。
这是我的代码段：
private void removeCameraDuplicate() {
String[] proj = {
MediaStore.Images.ImageColumns.DATA,
MediaStore.Images.ImageColumns._ID };
String selection = MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME + " = ? ";
String[] selectionArgs = new String[] { "Camera" };
Cursor cursor = mActivity.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj, selection, selectionArgs, MediaStore.Images.ImageColumns.DATE_TAKEN + " desc");
if (cursor != null) {
int idxPath = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
if (cursor.getCount() > 0 && idxPath > -1 && cursor.moveToFirst()) {
File original = new File(mMediaPath);
File cameraDupe = new File(cursor.getString(idxPath));
if (original.exists() && cameraDupe.exists()) {
LogUtils.LOGE("***> camera", "original " + original.length());
LogUtils.LOGE("***> camera", "original " + original.lastModified());
LogUtils.LOGE("***> camera", "duplicate " + cameraDupe.length());
LogUtils.LOGE("***> camera", "duplicate " + cameraDupe.lastModified());
if (original.length() == cameraDupe.length() && original.lastModified() == cameraDupe.lastModified()) {
if (cameraDupe.delete()) {
LogUtils.LOGE("***> camera", "duplicate deleted");
}
}
}
}
cursor.close();
}
}