android:删除图像

Question

我正从我的应用程序中删除一个图像文件.我在做

new  File(filename).delete ();

这实际上是删除文件.但是图片仍然可以在画廊中看到.

在搜索时我发现我们应该使用

getContentResolver().delete(Uri.fromFile(file), null,null); 删除

但在这里我得到了例外:

未知的文件URL.java.lang.IllegalArgumentException:未知的URL文件:///mnt/sdcard/DCIM/Camera/IMG_20120523_122612.jpg

当我看到任何文件浏览器时,会出现此特定图像.请帮我解决这个问题.有没有其他方法可以在物理删除图像时更新图库

Answer 1

我已经看到了很多建议使用的答案

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" +  Environment.getExternalStorageDirectory())));

这有效但会导致Media Scanner重新扫描设备上的媒体.更有效的方法是通过Media Store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();

Answer 2

使用下面的代码,它可能会帮助您.

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);
    }
}

删除图像后刷新图库使用下面的代码发送广播

(对于<KITKAT API 14)

 sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
 Uri.parse("file://" +  Environment.getExternalStorageDirectory())));

对于> = KITKAT API 14,请使用以下代码

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)中弃用.

2015年4月9日编辑

它的工作正常检查下面的代码

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

Answer 3

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

context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(new File(photoUri))));

这段代码对我有用,我认为它比重新安装整个SD卡更好 Intent.ACTION_MEDIA_MOUNTED

Answer 4

要删除图像,

ContentResolver contentResolver = getContentResolver();
contentResolver.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            MediaStore.Images.ImageColumns.DATA + "=?" , new String[]{ imagePath });

Answer 5

我尝试了所有这些解决方案,但在Android 6中没有运气.
最后,我发现这段剪辑的代码运行良好.

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Android 4.4和5.1中对此进行了测试,结果非常完美.

Answer 6

在 Kotlin 中你可以这样做：

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")
            }
        } 
    }
}