我正在更改应用程序代码以支持Android
7，但是在我的NotificationCompat.Builder.setSound（Uri）中，从FileProvider传递Uri时，通知没有播放声音，在Android
6中，使用Uri.fromFile（）可以正常工作。

mp3文件位于：

/ Animeflv /缓存/.sounds/

这是我的通知代码：

knf.animeflv.RequestBackground

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_not_r)
.setContentTitle(NotTit)
.setContentText(mess);
...
mBuilder.setVibrate(new long[]{100, 200, 100, 500});
mBuilder.setSound(UtilSound.getSoundUri(not)); //int

这是我的UtilSound.getSoundUri（int）

public static Uri getSoundUri(int not) {
        switch (not) {
            case 0:
                return RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            default:
                try {
                    File file=new File(Environment.getExternalStorageDirectory()+"/Animeflv/cache/.sounds",getSoundsFileName(not));
                    if (file.exists()) {
                        file.setReadable(true,false);
                        if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.N){
                            return FileProvider.getUriForFile(context, "knf.animeflv.RequestsBackground",file);
                        }else {
                            return Uri.fromFile(file);
                        }
                    }else {
                        Log.d("Sound Uri","Not found");
                        return getSoundUri(0);
                    }
                }catch (Exception e){
                    e.printStackTrace();
                    return getSoundUri(0);
                }
        }
    }

在AndroidManifest.xml中：

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="knf.animeflv.RequestsBackground"
    android:exported="false"
    android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
</provider>

provider_paths.xml：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="_.sounds" path="Animeflv/cache/.sounds/"/>
</paths>