Calling the same condition in the code

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Calling the same condition in the code

Asked 10 years, 3 months ago

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//Função para verificar existência de conexão com a internet
public boolean verificaConexao() {  
    boolean conectado;  
    ConnectivityManager conectivtyManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);  
    if (conectivtyManager.getActiveNetworkInfo() != null  
        && conectivtyManager.getActiveNetworkInfo().isAvailable()  
        && conectivtyManager.getActiveNetworkInfo().isConnected()) {  
            conectado = true;  
    } else {  
        conectado = false;  
    }  
    return conectado;  
}

// Verifica a conexao
if (verificaConexao() == true){
    // Chama a classe RequestTask
    new RequestTask().execute(ok);
} else {
    loader.setVisibility(View.GONE);
    tx.setVisibility(View.VISIBLE);
    tx.setText("Por favor, conecte-se a internet :(");
    ba.setVisibility(View.VISIBLE);
}

I want to use that same condition in several places in my code. I’d have to do something to call her instead of having to write her all over, every time I needed her?

2

Without you giving details of what the if makes it difficult to give a solution, but you can make a function even.

– Lucas Virgili

2014/08/28 at 03:23
1

If what you need to reuse is the condition of if, create a function that returns a boolean and make if ( condicao() ) { ... }. If what you want to reuse is the body, put it in the function and do if ( ... ) corpo(). If you want to reuse everything, simply create a function with if and body, and call it when you need it. If necessary, pass parameters to this function, and remember that it cannot change local variables in the calling method (if this is necessary, in Java there is no output, unless you encapsulate these variables in an object or array).

– mgibsonbr

2014/08/28 at 05:04
1

Try to explain better what you want. It is to create a function that returns true or false?

– Jorge B.

2014/08/28 at 07:50
There is something special you want to do and we don’t understand (then you need to explain it better). Or you still don’t know how to program? What everyone is understanding is that you want to do something very basic in programming, we need to know if this is the way to help you. Otherwise the question will be closed because it is not clear.

– Maniero

2014/08/28 at 12:58
edited, you can understand now? :)

– JBarbosa

2014/08/29 at 01:12
If what you want is not what I answered, then I still can not understand.

– Maniero

2014/08/29 at 02:04
You changed the question once again and still not giving to understand what you want. If you want to use the method verificaConexao() in several places, just use it. If you want all the if whole (which alias has a redundant condition) is in a method, put it in a method and call where you need it. It’s the same as what you’ve done with the other condition. If it’s not yet that, find a way to explain what you want. Changing the examples isn’t helping.

– Maniero

2014/08/29 at 03:28
tried with a method more than wasn’t working because of the value that wasn’t boolean but string, @bigown vlw ae :)

– JBarbosa

2014/08/29 at 04:10

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2 answers

3

Solved:

public void conexao() {
    if (verificaConexao() == true){
        // Chama a classe RequestTask
        new RequestTask().execute(site);
    } else {
        loader.setVisibility(View.GONE);
        tx.setVisibility(View.VISIBLE);
        tx.setText("Por favor, conecte-se a internet :(");
        ba.setVisibility(View.VISIBLE);
    }
}

// Verifica a conexao
conexao();

So that the return if it is null? Wouldn’t it be better to define public void conexao()?

– Gustavo Cinque

2014/08/29 at 11:20
Thanks @Gustavocinque, because I didn’t know :S

– JBarbosa

2014/08/29 at 16:42

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by Jean Coppieters • **381** points · Answer 1 · 2016-10-28T12:38:56+00:00

Hello!

The polite thing is that you separate the responsibilities there.

Predicate<ConnectivityManager> connectionValidator = 
                c -> null != c.getActiveNetworkInfo() 
                    && c.getActiveNetworkInfo().isAvailable() 
                    && c.getActiveNetworkInfo().isConnected();

Then, in the guy you’re going to validate the connection, you manipulate the attributes and pass.

ConnectivityManager conectivtyManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);  

if (connectionValidator.test(conectivtyManager)){
    new RequestTask().execute(ok);
} else {
    loader.setVisibility(View.GONE);
    tx.setVisibility(View.VISIBLE);
    tx.setText("Por favor, conecte-se a internet :(");
    ba.setVisibility(View.VISIBLE);
}

Of course here I assumed that you will validate only at class level. If it is something that will be used throughout the system, it is best that you create a class that implements Predicate and leave the code there. If you are using dependency injection somewhat better.