Sending data between Activity with PutExtra - Management

0

I have the following problem: I have three screens:

  • Main
  • Activity 2
  • Activity 3

In the first Activity (Main) I send a given putExtra to Activity 2 (user id). Activity 2 is the profile screen, and at a certain point I send it to a third Activity (ex: screen photo view).

So far it works with PutExtra and GetExtra. The problem is when I click the back button, it is giving an error and stopping the application.

Until now I've tried and tried to implement something like startActivityForResult, but I did not understand it right and it does not work.

The problem is specifically in the return from Activity 3 to Activity2, since even trying to send the user code back to this screen is conflicting, since Activity 2 already has a GetExtra in its beginning, which in turn came from Activity Main.

Example:

Activity Main:

public class MainActivity extends AppCompatActivity {

    private Button btnIrAct2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnIrAct2 = (Button) findViewById(R.id.btnIrAct2);
        btnIrAct2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent2 = new Intent(MainActivity.this, Activity2.class);
                intent2.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent2.putExtra("id_empresa", "12345");
                startActivity(intent2);

            }
        });


    }
}

Activity 2:

public class Activity2 extends AppCompatActivity {

    private Button btnIrAct3;
    private String mId_Empresa = null;
    static final int SERVICO_DETALHES_REQUEST = 1;
    private TextView tvResultado;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_2);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);



        /*  Recebe id de outra tela*/
        mId_Empresa = getIntent().getExtras().getString("id_empresa");

        tvResultado = (TextView) findViewById(R.id.tvAct2);
        tvResultado.setText(mId_Empresa);

        btnIrAct3 = (Button) findViewById(R.id.btnIrAct3);
        btnIrAct3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent3 = new Intent(Activity2.this, Activity3.class);
                intent3.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent3.putExtra("id_empresa", "12345");
                startActivityForResult(intent3, SERVICO_DETALHES_REQUEST );

            }
        });

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        if (requestCode == SERVICO_DETALHES_REQUEST && resultCode == RESULT_OK) {
            String resultBack = data.getStringExtra("id_empresa");
        }
    }

}

Activity 3:

public class Activity3 extends AppCompatActivity {

    private String idEmpresa = null;
    private TextView resultado;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_3);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        /*  Recebe id de outra tela*/
        idEmpresa = getIntent().getExtras().getString("id_empresa");

        resultado = (TextView) findViewById(R.id.tvAct3);
        resultado.setText(idEmpresa);


    }

    @Override
    public void finish()
    {
        Intent data = new Intent();
        data.putExtra("id_empresa", "12345");
        setResult(Activity.RESULT_OK, data);
        super.finish();
    }

}

I need to resolve this conflict. Send the same data as PutExtra from Activity 3 to Activity 2, but Activity 2 already expects a GetExtra from Activity Main.

    
asked by anonymous 03.09.2017 / 18:45

1 answer

0

You are putting the FLAG_ACTIVITY_CLEAR_TOP flag on your intents that open activities 2 and 3. By placing this flag, you remove the previous activities from your stack. If this is not the desired behavior, you have to remove this flag ( FLAG_ACTIVITY_CLEAR_TOP ) and then you will not need startActivityForResult() of activity 2 to 3.

More details at: FLAG_ACTIVITY_CLEAR_TOP

    
03.09.2017 / 21:03