我正在从我的应用程序中删除一个图像文件 。 I was doing
new File(filename).delete ();
这实际上是删除了文件。 但图像仍然在画廊中可见 。
在搜索时,我发现我们应该使用
get ContentResolver (). delete( 来自 File( 文件) 的 Uri. file( file), null, null; 以删除
但这里我得到了一个例外:
Unknown file URL. java.lang.IllegalArgumentException: Unknown URL file:///mnt/sdcard/DCIM/Camera/IMG_20120523_122612.jpg
当我使用任何文件浏览器看到时, 此特定图像将会存在 。 请帮助我解决这个问题 。 在图像被物理删除时, 是否有其它方法更新画廊 。
使用下面的代码,它可以帮助你。
File fdelete = new File(file_dj_path);
if (fdelete.exists()) {
if (fdelete.delete()) {
System.out.println("file Deleted :" + file_dj_path);
} else {
System.out.println("file not Deleted :" + file_dj_path);
}
}
在删除发送广播 时使用以下代码的图像使用后, < parge\\ em> 刷新画廊
(对 < KITKAT API 14)
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory())));
对 & gt; = KITKAT API 14 使用以下代码
MediaScannerConnection.scanFile(this, new String[] { Environment.getExternalStorageDirectory().toString() }, null, new MediaScannerConnection.OnScanCompletedListener() {
/*
* (non-Javadoc)
* @see android.media.MediaScannerConnection.OnScanCompletedListener#onScanCompleted(java.lang.String, android.net.Uri)
*/
public void onScanCompleted(String path, Uri uri)
{
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
}
});
因为:
ACTION_MEDIA_MOUNTED
在 KITKAT( API 14) 中折旧。
<强 > edied 04-09-2015
其正常工作,按以下代码检查
public void deleteImage() {
String file_dj_path = Environment.getExternalStorageDirectory() + "/ECP_Screenshots/abc.jpg";
File fdelete = new File(file_dj_path);
if (fdelete.exists()) {
if (fdelete.delete()) {
Log.e("-->", "file Deleted :" + file_dj_path);
callBroadCast();
} else {
Log.e("-->", "file not Deleted :" + file_dj_path);
}
}
}
public void callBroadCast() {
if (Build.VERSION.SDK_INT >= 14) {
Log.e("-->", " >= 14");
MediaScannerConnection.scanFile(this, new String[]{Environment.getExternalStorageDirectory().toString()}, null, new MediaScannerConnection.OnScanCompletedListener() {
/*
* (non-Javadoc)
* @see android.media.MediaScannerConnection.OnScanCompletedListener#onScanCompleted(java.lang.String, android.net.Uri)
*/
public void onScanCompleted(String path, Uri uri) {
Log.e("ExternalStorage", "Scanned " + path + ":");
Log.e("ExternalStorage", "-> uri=" + uri);
}
});
} else {
Log.e("-->", " < 14");
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory())));
}
}
下面是日志
09-04 14:27:11.085 8290-8290/com.example.sampleforwear E/-->﹕ file Deleted :/storage/emulated/0/ECP_Screenshots/abc.jpg
09-04 14:27:11.085 8290-8290/com.example.sampleforwear E/-->﹕ >= 14
09-04 14:27:11.152 8290-8290/com.example.sampleforwear E/﹕ appName=com.example.sampleforwear, acAppName=/system/bin/surfaceflinger
09-04 14:27:11.152 8290-8290/com.example.sampleforwear E/﹕ 0
09-04 14:27:15.249 8290-8302/com.example.sampleforwear E/ExternalStorage﹕ Scanned /storage/emulated/0:
09-04 14:27:15.249 8290-8302/com.example.sampleforwear E/ExternalStorage﹕ -> uri=content://media/external/file/2416
我见过很多答案 暗示使用
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
使媒体扫描器重新扫描设备上的媒体。 一个更有效的办法是通过媒体存储内容提供商查询/删除:
// Set up the projection (we only need the ID)
String[] projection = { MediaStore.Images.Media._ID };
// Match on the file path
String selection = MediaStore.Images.Media.DATA + " = ?";
String[] selectionArgs = new String[] { file.getAbsolutePath() };
// Query for the ID of the media matching the file path
Uri queryUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
ContentResolver contentResolver = getContentResolver();
Cursor c = contentResolver.query(queryUri, projection, selection, selectionArgs, null);
if (c.moveToFirst()) {
// We found the ID. Deleting the item via the content provider will also remove the file
long id = c.getLong(c.getColumnIndexOrThrow(MediaStore.Images.Media._ID));
Uri deleteUri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
contentResolver.delete(deleteUri, null, null);
} else {
// File not found in media store DB
}
c.close();
File file = new File(photoUri);
file.delete();
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(new File(photoUri))));
这个代码对我有效,我认为这比用 Intent.ACTION_MEDIA_MOUNTED 重新安装整个SD卡还要好。
要删除图像,
ContentResolver contentResolver = getContentResolver();
contentResolver.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
MediaStore.Images.ImageColumns.DATA + "=?" , new String[]{ imagePath });
I tried all those solutions but had no luck in Android 6.
In the end, I found this snipped of code that worked fine.
public static void deleteFileFromMediaStore(final ContentResolver contentResolver, final File file) {
String canonicalPath;
try {
canonicalPath = file.getCanonicalPath();
} catch (IOException e) {
canonicalPath = file.getAbsolutePath();
}
final Uri uri = MediaStore.Files.getContentUri("external");
final int result = contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?", new String[]{canonicalPath});
if (result == 0) {
final String absolutePath = file.getAbsolutePath();
if (!absolutePath.equals(canonicalPath)) {
contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?", new String[]{absolutePath});
}
}
}
我还在Android4.4和5.1中测试过这个,而且它非常有效。
在科特林,你可以做到这一点:
private fun deleteImage(path: String) {
val fDelete = File(path)
if (fDelete.exists()) {
if (fDelete.delete()) {
MediaScannerConnection.scanFile(this, arrayOf(Environment.getExternalStorageDirectory().toString()), null) { path, uri ->
Log.d("debug", "DONE")
}
}
}
}
sendBroadcast(new Intent(
Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory())));
此代码起作用, 但非常昂贵的资源 。 它会卸载 & amp; 然后挂载 SDCard, 这可能影响到某些应用程序, 或者需要巨大的系统资源来刷新画廊 。 我仍然在寻找一个最佳的替代 & amp; 如果找到的话, 将会发布 。
我也有同样的问题,我尝试了三种不同的方法来删除图像。有时,它有时起作用了,但有时没有。经过太多的时间,我现在已经删除了所有的方法。我想说的是:<强势的>注意处理BITMAP 。我正在拍摄一张照片,它一直存在,如果需要,它会旋转:
public static Bitmap rotatePictureToPortraitMode(String filePath, Bitmap myBitmap) {
try {
ExifInterface exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
Log.d("EXIF", "Exif: " + orientation);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
myBitmap = Bitmap.createBitmap(myBitmap, 0, 0, myBitmap.getWidth(), myBitmap.getHeight(), matrix, true); // rotating bitmap
} catch (Exception e) {
}
return myBitmap;
}
之后,我试图删除图像,但正如我先前说过的,它行不通。删除这一方法有助于我解决问题。
也许这只是我的问题,但当我删除了这个之后,它对我帮助很大,所以我想说,要小心地说,你是如何处理图像的。 对于我的案件,我用了前面提到的答案:
File file = new File(photoUri);
file.delete();
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
Uri.fromFile(new File(photoUri))));
希望它能帮上忙!
public static boolean deltefolderwithimages(File dir) {
if (dir.isDirectory()) {
String[] children = dir.list();
for (int i=0; i<children.length; i++) {
boolean success = deltefolderwithimages(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
return dir.delete();
}
DocumentFile.file. from SingleUri( comtext, uri).delete (); 。
为我工作,为我工作
this all method deprecated for Android 11+, for Delete any media file in Android11+ you can send request for delete., for this i found one dependency for this just check i hope your issue is resolve using this method.
https://github.com/jcredking/Delete1,rel=“无尾随 noreferrer'>https://github.com/jcredking/Delete1
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