Android 单击按钮只工作一次

当我点击我的按钮时，它会显示一个随机数，但当我再次点击它时，什么都不会发生。我如何使按钮每次点击时都显示一个随机数

public class MainActivity extends ActionBarActivity {

private int randomNumber;
private Button button;
private TextView numbersDisplayed;
private int[] allNumbers;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button = (Button)findViewById(R.id.button);
    numbersDisplayed = (TextView)findViewById(R.id.numbersDisplayed);

    allNumbers= new int[]{1,2,3,4,5,6,7,8,9};
    int numArrayLength = allNumbers.length;
    randomNumber = (int)(Math.random() * numArrayLength);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.button:
                numbersDisplayed.setText(String.valueOf(allNumbers[randomNumber]));
                break;

            }
        }
    });
}


}

---

在

onClick

方法中移动生成随机数所需的逻辑（因此每次单击按钮时它都会运行）：

---

在

onClick

方法中移动生成随机数所需的逻辑（因此每次单击按钮时它都会运行）：

numbersDisplayed.setText（String.valueOf（allNumbers[new Random（）.nextInt（9）]）；您可以跳过int numaraylenth和randomNumber…但可能需要使用数学类进行作业或练习？.numbersDisplayed.setText（String.valueOf（allNumbers[new Random（）.nextInt（9）]）；你可以跳过int numaraylenth和randomNumber…但也许你需要在数学课上做作业或练习？。

public class MainActivity extends ActionBarActivity {

private int randomNumber;
private Button button;
private TextView numbersDisplayed;
private int[] allNumbers;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button = (Button)findViewById(R.id.button);
    numbersDisplayed = (TextView)findViewById(R.id.numbersDisplayed);

    allNumbers= new int[]{1,2,3,4,5,6,7,8,9};
    int numArrayLength = allNumbers.length;

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.button:
                    randomNumber = (int)(Math.random() * numArrayLength);
                    numbersDisplayed.setText(String.valueOf(allNumbers[randomNumber]));
                    break;
            }
        }
    });
}

}