I always found the following answer for my Question:

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

but it do not work on my System (Nexus4 Android 4. ...)

I can create a File and add it to the Media-DB whith this code

Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    Uri contentUri = Uri.fromFile(file);
    mediaScanIntent.setData(contentUri);
    context.sendBroadcast(mediaScanIntent);

Where "file" is the new image-file i want to add.

after deleting the File I try to refresch the gallery by

Intent intent = new Intent(Intent.ACTION_MEDIA_MOUNTED);
    Uri contentUri = Uri.parse("file://" + Environment.getExternalStorageDirectory());
    intent.setData(contentUri);
    context.sendBroadcast(intent);

or 

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

but there are still empty placeholder in the Galery.

I do not know why?...

To be on the safe side I add too my Activity in the AndroidManifest.xml

<intent-filter>
            <action android:name="android.intent.action.MEDIA_MOUNTED" />
            <data android:scheme="file" /> 
        </intent-filter>

but the result is the same. Any idea to solve the problem?

android android-intent android-broadcast
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