以编程方式从设备中删除图像文件

Question

如何使用我的应用程序删除图像文件？

File file = new File("path"); //PATH is: /storage/sdcard0/DCIM/Camera/IMG_20160913_165933.jpg

1. file.delete(); // try this one but not delete file....
2. boolean isDelete = file.delete(); //this also not delete...
3. context.deleteFile(file); // thisn one also not working in my example....

Answer 1

如果您尝试删除图片或类似图片，则可能会遇到问题。它可能会返回结果为 true，但文件仍然存在。我浪费了很多时间，对我来说最有效的是：

  private void deleteImage(File file) {
        // 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();
    }