java - 安卓工作室(Java): Continue prime number for loop on button press

Question

我希望能够在每次单击按钮时显示下一个质数，但找不到使其工作的方法。有人帮忙吗？

public class MainActivity extends ActionBarActivity {

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

        Button primeButton = (Button) findViewById(R.id.primeButton);
        primeButton.setOnClickListener(
            new Button.OnClickListener(){
                public void onClick(View v){
                    TextView primeText = (TextView) findViewById(R.id.primeText);
                    int max =  500;
                    for(int i=2; i<=max; i++) {
                        boolean isPrimeNumber = true;
                        for (int j = 2; j <= i; j++) {
                            if (i % j == 0 ) {
                                isPrimeNumber = false;
                                break;
                            }

                        }
                        if (isPrimeNumber){
                            primeText.setText(Integer.toString(i));
                        }
                    }
                }
            }
        );
    }
}

Answer 1

试试这个

public class MainActivity extends Activity {

 Button b;
 int max = 500;
 TextView vTextView;
 int j = 2;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  b = (Button) findViewById(R.id.button1);
  vTextView = (TextView) findViewById(R.id.textView1);

  b.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub

    for (int i = j; i <= max; i++) {
     if (isPrimeNumber(i)) {
      vTextView.setText(i+"");
      j = i+1;
      break;
     }
    }

   }
  });

 }

 public boolean isPrimeNumber(int number) {

  for (int i = 2; i <= number / 2; i++) {
   if (number % i == 0) {
    return false;
   }
  }
  return true;
 }

}