blocks|key|850577|text|Android有一个可以跟踪媒体文件的缓存。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|850578|试试这个：|850579|sendBroadcast(new+Intent(Intent.ACTION_MEDIA_MOUNTED,+Uri.parse("file://"+%2B+Environment.getExternalStorageDirectory())));|code-block|syntax|javascript|850580|它使MediaScanner服务再次运行，这应该会从设备的缓存中删除已删除的映像。|850581|看起来您还需要将此权限添加到您的AndroidManifest.xml：|850582|<intent-filter>
++<action+android:name="android.intent.action.MEDIA_MOUNTED"+/>
++<data+android:scheme="file"+/>+
</intent-filter>|850583|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Android has a cache of sorts that keeps track of media files.

Try this:

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

It makes the MediaScanner service run again, which should remove the deleted image from the device's cache.

Looks like you also need to add this permission to your AndroidManifest.xml:

<pre><code>&lt;intent-filter&gt;
 &lt;action android:name="android.intent.action.MEDIA_MOUNTED" /&gt;
 &lt;data android:scheme="file" /&gt; 
&lt;/intent-filter&gt;
</code></pre>

blocks|key|850614|text|您也可以使用以下方法从图库中删除图像：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|850615|getContentResolver().delete(imageUri，null，null)；|850616|只需确保'imageUri‘是您调用insert时返回给您的uri。|850617|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You can also delete the image from the Gallery by using:

getContentResolver().delete(imageUri, null, null);

Just make sure that 'imageUri' is the uri returned to you when you called insert.

blocks|key|850672|text|摘自：http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|850673|这对我来说很有效(在HTC+Desire，Android+2.3上测试)|850674|//+Tell+the+media+scanner+about+the+new+file+so+that+it+is
//+immediately+available+to+the+user.
MediaScannerConnection.scanFile(this,new+String[]+{+file.toString()+},+null,
new+MediaScannerConnection.OnScanCompletedListener()+{
public+void+onScanCompleted(String+path,+Uri+uri)+{
Log.i("ExternalStorage",+"Scanned+"+%2B+path+%2B+":");
Log.i("ExternalStorage",+"->+uri="+%2B+uri);
}
});|code-block|syntax|javascript|850675|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.html^0|3|35|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

taken from: <a href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.html" rel="nofollow">http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/content/ExternalStorage.html</a>

This worked for me ( tested on HTC Desire, Android 2.3)

<pre><code>// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.scanFile(this,new String[] { file.toString() }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-&gt; uri=" + uri);
}
});
</code></pre>

blocks|key|850692|text|正如评论中所述，被接受的答案使用大量内存。虽然MediaScannerConnection没有"deleteFile“方法，但在删除文件后，只需将旧文件路径传递给"scanFile”方法即可。介质扫描仪将重新扫描并取出介质。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|850693|已在N5上测试。Android+4.4。|850694|编辑:其他人已经声明这在4.2上不起作用|850695|new+AsyncTask<Void,+Void,+Void>(){
++++++++@Override
++++++++protected+Void+doInBackground(Void...+params)+{
++++++++++++String+filePath+=+recording.file.getAbsolutePath();
++++++++++++recording.file.delete();
++++++++++++MediaScannerConnection.scanFile(context,
++++++++++++++++++++new+String[]{filePath},+null,+null);
++++++++++++return+null;
++++++++}
++++}.execute();|code-block|syntax|javascript|850696|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

As stated in the comments, the accepted answer uses a lot of memory. While MediaScannerConnection doesn't have a "deleteFile" method, just pass in the the old file path to the "scanFile" method once you've deleted the file. The media scanner will rescan and remove the media. 

tested on N5. Android 4.4.

EDIT: Other have stated this doesn't work on 4.2

<pre><code>new AsyncTask&lt;Void, Void, Void&gt;(){
 @Override
 protected Void doInBackground(Void... params) {
 String filePath = recording.file.getAbsolutePath();
 recording.file.delete();
 MediaScannerConnection.scanFile(context,
 new String[]{filePath}, null, null);
 return null;
 }
 }.execute();
</code></pre>

blocks|key|1065137|text|使用此方法getContentResolver().delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1065138|+MediaStore.Images.Media.\_ID+%2B+"=?",+new+String[]{+Long.toString(id)+}+);|code-block|syntax|javascript|1065139|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use this method 
getContentResolver().delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
 MediaStore.Images.Media._ID + "=?", new String[]{ Long.toString(id) } );

blocks|key|850763|text|将此行添加到File.delete();之后|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|850764|MediaScannerConnection.ScanFile(this,new+string[]{fileUrl.ToString()},+null,+null);|code-block|syntax|javascript|850765|entityMap^0|6|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Add this line after <code>File.delete();</code>:

<pre><code>MediaScannerConnection.ScanFile(this,new string[]{fileUrl.ToString()}, null, null);
</code></pre>

blocks|key|1065218|text|在删除文件后立即添加以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1065219|MediaScannerConnection.scanFile(context,+arrayOf(imageURI.getPath()),+null,+null)|offset|length|style|CODE|1065220|:)|1065221|entityMap^0|0|0|29|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Add this right after deleting a file:

<code>MediaScannerConnection.scanFile(context, arrayOf(imageURI.getPath()), null, null)</code>

:)

blocks|key|850811|text|if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.KITKAT)+{
++MediaScannerConnection.scanFile(context,new+String[]{selectedVideoDelete},+null,+null);
}+else+{
++context.sendBroadcast(new+Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://"%2B+Environment.getExternalStorageDirectory())));
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|850812|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.KITKAT) {
 MediaScannerConnection.scanFile(context,new String[]{selectedVideoDelete}, null, null);
} else {
 context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
}
</code></pre>

I insert an image via:

<pre><code> ContentValues values = new ContentValues(); 
 values.put(Images.Media.TITLE, filename);
 values.put(Images.Media.DATE_ADDED, System.currentTimeMillis()); 
 values.put(Images.Media.MIME_TYPE, "image/jpeg");

 Uri uri = this.getContentResolver().insert(Images.Media.EXTERNAL_CONTENT_URI, values);
</code></pre>

But when I try to delete

<pre><code> File f = new File(imageURI);
 f.delete();
</code></pre>

The picture is no longer there but an empty placeholder is. Any ideas?

Android file delete leaves empty placeholder in Gallery

Android

我通过以下方式插入图像：    ContentValues values = new ContentValues();       values.put(Images.Media.TITLE, filename);    values.put(Images.Media.DATE_ADDED, System.curren...

问Android文件删除在图库中留空占位符
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