从内部存储中删除文件

我正在试图删除存储在内部存储器中的图像，目前为止我已经想出了这个主意:

File dir = getFilesDir();
File file = new File(dir, id+".jpg");
boolean deleted = file.delete();

这是另一个问题，也就是 回答说:

File dir = getFilesDir();
File file = new File(dir, "my_filename");
boolean deleted = file.delete();

我的示例总是返回 false。我可以在 eclipse 中看到 DDMS 中的文件 fx 2930.jpg。

162054 次浏览
小开
最佳答案

The getFilesDir() somehow didn't work. Using a method, which returns the entire path and filename gave the desired result. Here is the code:

File file = new File(inputHandle.getImgPath(id));
boolean deleted = file.delete();
小开

Have you tried Context.deleteFile() ?

小开

You can also use: file.getCanonicalFile().delete();

小开

Have you tried getFilesDir().getAbsolutePath()?

Seems you fixed your problem by initializing the File object with a full path. I believe this would also do the trick.

小开 
String dir = getFilesDir().getAbsolutePath();
File f0 = new File(dir, "myFile");
boolean d0 = f0.delete();
Log.w("Delete Check", "File deleted: " + dir + "/myFile " + d0);

The code File dir = getFilesDir(); doesn't work because this is a request for a File object. You're trying to retrieve the String that declares the path to your directory, so you need to declare 'dir' as a String, and then request that the directory's absolute path in String form be returned by the constructor that has access to that information.

小开

Java

File file = new File(photoPath);
file.delete();


MediaScannerConnection.scanFile(context,
new String[]{file.toString()},
new String[]{file.getName()},null);

Kotlin

val file = File(photoPath)
file.delete()


MediaScannerConnection.scanFile(context, arrayOf(file.toString()),
arrayOf(file.getName()), null)
小开 
>     2019-11-12 20:05:50.178 27764-27764/com.strba.myapplicationx I/File: /storage/emulated/0/Android/data/com.strba.myapplicationx/files/Readings/JPEG_20191112_200550_4444350520538787768.jpg//file when it was created


2019-11-12 20:05:58.801 27764-27764/com.strba.myapplicationx I/File: content://com.strba.myapplicationx.fileprovider/my_images/JPEG_20191112_200550_4444350520538787768.jpg //same file when trying to delete it

solution1:

              Uri uriDelete=Uri.parse (adapter.getNoteAt (viewHolder.getAdapterPosition ()).getImageuri ());//getter getImageuri on my object from adapter that returns String with content uri

here I initialize Content resolver and delete it with a passed parameter of that URI

            ContentResolver contentResolver = getContentResolver ();
contentResolver.delete (uriDelete,null ,null );

solution2(my first solution-from head in this time I do know that ): content resolver exists...

              String path = "/storage/emulated/0/Android/data/com.strba.myapplicationx/files/Readings/" +
adapter.getNoteAt (viewHolder.getAdapterPosition ()).getImageuri ().substring (58);


File file = new File (path);
if (file != null) {
file.delete ();
}
小开 
File file = new File(getFilePath(imageUri.getValue()));
boolean b = file.delete();

is not working in my case.

boolean b = file.delete();                 // returns false
boolean b = file.getAbsolutePath.delete(); // returns false

always returns false.

The issue has been resolved by using the code below:

ContentResolver contentResolver = getContentResolver();
contentResolver.delete(uriDelete, null, null);

提交答案