Merge "RingtoneManager: add @Nullable to openDefaultRingtoneUri()."

import android.Manifest;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.annotation.RequiresPermission;

import android.annotation.SdkConstant;

import android.annotation.SdkConstant.SdkConstantType;

     * @throws FileNotFoundException if the provided URI could not be opened.

     * @see #getDefaultUri

     */

    public static AssetFileDescriptor openDefaultRingtoneUri(

    public static @Nullable AssetFileDescriptor openDefaultRingtoneUri(

            @NonNull Context context, @NonNull Uri uri) throws FileNotFoundException {

        // Try cached ringtone first since the actual provider may not be

        // encryption aware, or it may be stored on CE media storage