About the onActivityResult() method in Android Studio

Question

Good afternoon guys, I have a job to deliver done in Android Studio, I was trying to send Strings by intents, my teacher said that the correct way would be using startActivityForResult() and Onactivity(), but it seems that the Strings are not being sent, I tried to change it in various ways. Can you help me?

Sending Activity Code

            btArmazenaDisco.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            estilMusica = EstiloMusical.getText().toString();
            alb = album.getText().toString();
            artist = artista.getText().toString();

                quantmusic = quantmusica.getText().toString();

                 // enviando os itens
                   Intent intentEnviador = new Intent(CriarDiscoActivity.this,Activity_Pastas.class);
                   Bundle informacao = new Bundle();



                    informacao.putString("addestilMusica",estilMusica);
                    informacao.putString("addAlbum",alb);
                    informacao.putString("addArtista",artist);
                    informacao.putString("addQuantiMusica",quantmusic);

                    intentEnviador.putExtras(informacao);
                    setResult(RESULT_OK,intentEnviador);


                   startActivityForResult(intentEnviador,Constante_Activity_Pastas);


            }

Code Activity Receiver

@Override

protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);


    if(resultCode==CriarDiscoActivity.RESULT_OK && requestCode== CriarDiscoActivity.Constante_Activity_Pastas) {

        Bundle bundle = data.getExtras();
        if(bundle!= null) {


            estiloMusica = bundle.getString("addestilMusica");
            Album = bundle.getString("addAlbum");
            Artista = bundle.getString("addArtista");
            QuantMusica = bundle.getString("addQuantiMusica");

                //Testando para ver se foi enviado
                test.setText(estiloMusica);
            Toast.makeText(this, estiloMusica, Toast.LENGTH_SHORT).show();
            //
            musicas.add(new Musica(estiloMusica, Album, Artista, QuantMusica, 0));
        }

    }


}

Answer 1

It seems that you are confusing some things. A same Activity that uses startActivityForResult() should implement the method onActivityResult().

Initial Activity

btArmazenaDisco.setOnClickListener(new View.OnClickListener() {
    Intent intentEnviador = new Intent(CriarDiscoActivity.this, Activity_Pastas.class);
    Bundle informacao = new Bundle();

    informacao.putString("addestilMusica",estilMusica);
    informacao.putString("addAlbum",alb);
    informacao.putString("addArtista",artist);
    informacao.putString("addQuantiMusica",quantmusic);
    intentEnviador.putExtras(informacao);

    // Aqui você iniciará a Activity "Activity_Pastas"
    startActivityForResult(intentEnviador,Constante_Activity_Pastas);
}

// Aqui você receberá o retorno da Activity "Activity_Pastas", caso tenha algum.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == Constante_Activity_Pastas) {
        if(resultCode == Activity.RESULT_OK){
            // Faça algo
        }
    }
}

Called Activity

// Código para receber a informação passada
Intent recebido = getIntent()
String estilMusica = intent.getStringExtra("addestilMusica");
String alb = intent.getStringExtra("addAlbum");
String artist = intent.getStringExtra("addArtista");
String quantmusic = intent.getStringExtra("addQuantiMusica");

// Código para encerrar a Activity e avisar a Inicial (que está esperando pelos resultados)
Intent intent = new Intent();
setResult(Activity.RESULT_OK, intent);
finish();

Notice that in the example I did not pass any Extra from Activity Call to Initial Activity, but this can be done by placing the Extras in the Intent and receiving in onActivityResult.

In order, occurs:

1. Click the button -> startActivityForResult();
2. Activity_Pastas is created;
3. You do what you need in Activity_Pastas, receives the data with getIntent();
4. Warns that is closing the Activity_Pastas with setResult(Activity.RESULT_OK, intent);
5. Closes the Activity_Pastas with finish();
6. onActivityResult() is called in the main activity with requestCode == Constante_Activity_Pastas and resultCode == Activity.RESULT_OK.