如何更改闹钟，通知和铃声

Question

我正试图创建一个墙纸应用程序，在该应用程序中提供了墙纸和铃声……我在该应用程序中创建了一个活动，在其中显示了所有铃声并有一个下载按钮，单击该按钮后，音频文件已下载到下载文件夹中，然后会显示一个弹出窗口，询问用户要将音频文件添加为铃声，警报或通知音，我希望在用户单击任一按钮，然后音频应将系统音频文件替换为下载的音频文件...我已尽力而为，但是没有用。仍然是默认的警报音...所以请帮助我，以便我可以使用户从系统上更改声音为已下载文件...

下面是我在我的应用程序中使用的代码，用于将文件设置为警报，铃声或单击按钮后执行的通知铃声。

 setasalarm.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //Toast.makeText(mcontext,"check",Toast.LENGTH_LONG).show();
            Uri uri = Uri.parse(Environment.getExternalStorageDirectory()+"/Download/"+filenamedata);
            File file =new File(String.valueOf(uri));
            if(file.exists()){
                try {
                    if (checkSystemWritePermission()) {
                        RingtoneManager.setActualDefaultRingtoneUri(mcontext, RingtoneManager.TYPE_ALARM, uri);
                        Toast.makeText(mcontext, "Set as alarm successfully ", Toast.LENGTH_SHORT).show();
                    }else {
                        Toast.makeText(mcontext, "Allow modify system settings ==> ON ", Toast.LENGTH_LONG).show();
                    }
                } catch (Exception e) {
                    Log.i("alarm",e.toString());
                    Toast.makeText(mcontext, "unable to set as alarm ", Toast.LENGTH_SHORT).show();
                }

                alertDialog.dismiss();
            }else{
                Toast.makeText(mcontext,"not availabe",Toast.LENGTH_LONG).show();
                alertDialog.dismiss();
            }
        }
    });
    setasringtone.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //Toast.makeText(mcontext,"check",Toast.LENGTH_LONG).show();
            Uri uri = Uri.parse(Environment.getExternalStorageDirectory()+"/Download/"+filenamedata);
            File file =new File(String.valueOf(uri));
            if(file.exists()){
                try {
                    if (checkSystemWritePermission()) {
                        RingtoneManager.setActualDefaultRingtoneUri(mcontext, RingtoneManager.TYPE_RINGTONE, uri);
                        Toast.makeText(mcontext, "Set as Ringtone successfully ", Toast.LENGTH_SHORT).show();
                    }else {
                        Toast.makeText(mcontext, "Allow modify system settings ==> ON ", Toast.LENGTH_LONG).show();
                    }
                } catch (Exception e) {
                    Log.i("alarm",e.toString());
                    Toast.makeText(mcontext, "unable to set as ringtone ", Toast.LENGTH_SHORT).show();
                }

                alertDialog.dismiss();
            }else{
                Toast.makeText(mcontext,"not availabe",Toast.LENGTH_LONG).show();
                alertDialog.dismiss();
            }
        }
    });
    setasnotification.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //Toast.makeText(mcontext,"check",Toast.LENGTH_LONG).show();
            Uri uri = Uri.parse(Environment.getExternalStorageDirectory()+"/Download/"+filenamedata);
            File file =new File(String.valueOf(uri));
            if(file.exists()){
                try {
                    if (checkSystemWritePermission()) {
                        RingtoneManager.setActualDefaultRingtoneUri(mcontext, RingtoneManager.TYPE_NOTIFICATION, uri);
                        Toast.makeText(mcontext, "Set as Notification successfully ", Toast.LENGTH_SHORT).show();
                    }else {
                        Toast.makeText(mcontext, "Allow modify system settings ==> ON ", Toast.LENGTH_LONG).show();
                    }
                } catch (Exception e) {
                    Log.i("alarm",e.toString());
                    Toast.makeText(mcontext, "unable to set as notification ", Toast.LENGTH_SHORT).show();
                }

                alertDialog.dismiss();
            }else{
                Toast.makeText(mcontext,"not availabe",Toast.LENGTH_LONG).show();
                alertDialog.dismiss();
            }
        }
    });