When I click, I want to define the phrase through the indexes

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When I click, I want to define the phrase through the indexes

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#1 by (1 votes)

1

As you can see in the code, when I click I'm defining the phrase in a random way, but when I click, I want the phrase to be defined by the indexes myself, how do I do this?

Public class MainActivity extends AppCompatActivity {

    private TextView textoNovaFrase;
    private Button botaoNovaFrase;

    private String[] frases = {
            "Se você traçar metas absurdamente altas e falhar, seu fracasso será muito melhor que o sucesso de todos",
            "O sucesso normalmente vem para quem está ocupado demais para procurar por ele",
            "Se você não está disposto a arriscar, esteja disposto a uma vida comum"
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textoNovaFrase = (TextView) findViewById(R.id.textoNovaFraseId);
        botaoNovaFrase = (Button) findViewById(R.id.botaoNovaFraseId);

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

                Random randomico = new Random();
                int numeroAleatorio = randomico.nextInt( frases.length );

                textoNovaFrase.setText( frases[ numeroAleatorio ] );
            }
        });

java android string array

asked by anonymous 13.10.2017 / 05:31

1 answer

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score 1 · Answer 1

If you want to put different phrases in a sequential way you can use a field in the class to find out what position it is going to go on and increment as it shows:

Public class MainActivity extends AppCompatActivity {
    ....
    private String[] frases = {
            "Se você traçar metas absurdamente altas e falhar, seu fracasso será muito melhor que o sucesso de todos",
            "O sucesso normalmente vem para quem está ocupado demais para procurar por ele",
            "Se você não está disposto a arriscar, esteja disposto a uma vida comum"
    };
    private int posicao = 0; //novo campo aqui

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        botaoNovaFrase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                textoNovaFrase.setText( frases[ posicao++] ); //mostra e incrementa aqui

            }
        });

Note that this causes a problem if you click too many times because it passes the dimension of the array frases . You can improve and fix this by:

textoNovaFrase.setText( frases[posicao%frases.length] );
posicao++;

So it always generates an index between 0 and the size of the array, which will always work correctly.

Even though with to stay with the 100% correct solution you will have to save and restore this new field in the Activity state, particularly in onSaveInstanceState and onRestoreInstanceState , otherwise running the orientation of the device or other type of configuration changes make you lose the position you were in.

Read more about the status of an Activity here