error when playing selected audio

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error when playing selected audio

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#1 by (0 votes)
#2 by (-1 votes)

0

I am trying to make a small app to practice that consists of a start activity and an activity to select an audio and play it. To select the audio I use:

btnCambiarAudio.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent();
            intent.setType("audio/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select     Audio "), COD_SONIDO);
        }

In the onActivityResult :

case COD_SONIDO:
                Uri mUri=data.getData();
                String stringUriAudio= data.getDataString();
                //String stringUriAudio= mUri.toString();
 SharedPreferences datosGuardados = getSharedPreferences("datosMarcos",MODE_PRIVATE);
                SharedPreferences.Editor editor = datosGuardados.edit();
                editor.putString(nombreAudioMarco, data.getDataString());
                editor.apply();

I have also tried the commented instruction. As you can see, I receive the route of the selected audio and the storage using SharePreferences .

Then through another button I play the selected audio.

SharedPreferences datosGuardados = getSharedPreferences("datosMarcos",MODE_PRIVATE);

            //obtiene la ruta guardada del archivo de audio seleccionado y vinculada al marco.
            String audioMarco = datosGuardados.getString(nombreAudioMarco, "NULL");
                    Uri uriAudio= Uri.parse(audioMarco);
                mediaPlayer = new MediaPlayer();
                try {
                                                mediaPlayer.setDataSource(getApplicationContext,uriAudio);
                    mediaPlayer.prepare();
                    mediaPlayer.start();
                } catch (IOException e) {
                    Log.e(LOG_TAG, "fallo en la reproduccion");
                }
            }
            else {
                Toast.makeText(getApplicationContext(), "no hay archivo de audio vinculado", Toast.LENGTH_LONG).show();
            }

First I recover the path of the selected audio in the string saved with SharedPreferences , then I create a Uri , and I use it to play the audio with MediaPlayer .

In principle it works, that is, from the activity of the start step to the selection activity, I select an audio, and when I give the play, it works, it reproduces the audio without problems and I also stop it without problems.

The problem, and what I do not understand, and I have been looking for and testing for days, is that if I go from the selection activity to the start activity, and return to the selection activity, it does not work anymore, it gives this error:

D / MediaPlayer: Could not open file on client side, trying server side

E / MediaPlayer: Unable to create media player

And if I re-select the audio and reproduce it, it works again.

In principle, if the route stored in the sharedpreferences works after selecting the audio, it should work when I leave and return to the activity.

I think it may be something of permission, but the audio that I select is in the internal memory, and in theory it does not need to give any special permission.

As information, add, that the tests were made in a physical device, a sony m2, with lollipop (v 5.1.1) .

Thank you.

java android mediaplayer audio

asked by PABLO MILLAN 05.07.2018 в 00:19

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2 answers

0

In this case the value that is received in the intent that contains the audio may be empty, therefore it would be saving this value and would not work correctly, I suggest you validate this case using this method:

   public static boolean isNullorEmpty(String s ) {
        return s == null || s.trim().isEmpty();
    }

When detecting that there is an empty value, the preference would be taken

   String audioMarco = datosGuardados.getString(nombreAudioMarco, "NULL");

your code would be:

case COD_SONIDO:
            Uri mUri=data.getData();
            String stringUriAudio= data.getDataString();

            //*Si el valor no es null o vacio guarda el uri. 
            if(!isNullorEmpty(isNullorEmpty)){
                SharedPreferences datosGuardados = getSharedPreferences("datosMarcos",MODE_PRIVATE);
                SharedPreferences.Editor editor = datosGuardados.edit();
                editor.putString(nombreAudioMarco, data.getDataString());
                editor.apply();
             }
             ...
             ...

answered by 06.07.2018 в 17:53

Error android studio can not find line Inaccessible methods from application class (kotlin)

score -1 · Accepted Answer

In case someone has served him, I have managed to solve the error.

Doing tests I saw that in older devices that I have at home if it worked for me, and from there I found the solution. If I have understood correctly, the error is given from android 4.4 (kitkat), and to solve it you have to replace the ACTION_GET_CONTENT with ACTION_OPEN_DOCUMENT, and thus maintain the URI permission that gives the document when it is selected, because with ACTION_GET_CONTENT it did not maintain the permission, for that reason it did not give error when it reproduced the audio when selecting it and if it gave error when it left and it returned to enter the activity.

But with this change it only maintains the permission if the device is not restarted. In order to maintain the permission even if the device is restarted, it must be added in the onActivityResult:

final int takeFlags = intent.getFlags()
        & (Intent.FLAG_GRANT_READ_URI_PERMISSION
        | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
// Check for the freshest data.
getContentResolver().takePersistableUriPermission(uri, takeFlags);

I hope to have explained myself well. This is the link to the android documentation that explains it: persistent permissions.

Greetings.