大家好:)我一直在这个问题上摸不着头脑，似乎找不到合适的答案，尽管我确信这是一个简单的问题。
我有一个程序，当按下另一个按钮时，它会在一组按钮上生成随机字母文本。 当我打开应用程序时，它加载正常，第一次按下按钮时它会正确生成，但之后我似乎无法让它重新生成随机字母。
我可以通过添加一个 Intent 来实现我想要的，并且本质上“刷新”(不确定措辞)主要 Activity ，但我想为按钮单击添加一个计数器，并且当 Activity 执行时它会重置。
{Intent intent = new Intent(MainActivity.this, MainActivity.class);
startActivity(intent);
finish();
overridePendingTransition(0, 0);
我似乎无法全神贯注于如何做到这一点。似乎每次单击按钮时我都需要重新运行 java。有什么建议吗？
这里是一些代码，我使用按钮而不是 TextView ，因为我a)想要设置一个简单的背景b)可能会让它们稍后可点击。非常感谢!
public class MainActivity extends Activity
{
Button spin;
Button reel1,reel2,reel3,reel4;
private String rnd,rnd2,rnd3,rnd4;
int count1=50;
@Override
protected void onCreate(Bundle savedInstanceState)
{super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();}
private static String rndm[] = {"A","B","C","D"};
{rnd = rndm[(int) (Math.random() * rndm.length)];}
private static String rndm2[] = {"A","B","C","D"};
{rnd2 = rndm2[(int) (Math.random() * rndm2.length)];}
private static String rndm3[] = {"A","B","C","D"};
{rnd3 = rndm3[(int) (Math.random() * rndm3.length)];}
private static String rndm4[] = {"A","B","C","D"};
{rnd4 = rndm4[(int) (Math.random() * rndm4.length)];}
public void perform_action(View v){}
public void addListenerOnButton() {
spin = (Button) findViewById(R.id.spin);
spin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
{Toast.makeText(getApplicationContext(),"button pressed", Toast.LENGTH_SHORT).show();}
{Button tv = (Button) findViewById(R.id.reel1);
tv.setText(String.valueOf(rnd));
tv.setTextColor(Color.parseColor("#000000"));}
{Button tv = (Button) findViewById(R.id.reel2);
tv.setText(String.valueOf(rnd2));
tv.setTextColor(Color.parseColor("#000000"));}
{Button tv = (Button) findViewById(R.id.reel3);
tv.setText(String.valueOf(rnd3));
tv.setTextColor(Color.parseColor("#000000"));}
{Button tv = (Button) findViewById(R.id.reel4);
tv.setText(String.valueOf(rnd4));
tv.setTextColor(Color.parseColor("#000000"));
最佳答案
我明白了!!!呜呜。但我无法为自己投出正确答案。
public class MainActivity extends Activity
{
Button spin;
Button reel1,reel2,reel3,reel4;
private String rnd,rnd2,rnd3,rnd4;
int count1=50;
@Override
protected void onCreate(Bundle savedInstanceState)
{super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();}
public void perform_action(View v){}
public void addListenerOnButton() {
spin = (Button) findViewById(R.id.spin);
spin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String rndm[] = {"A","B","C","D"};
{rnd = rndm[(int) (Math.random() * rndm.length)];}
String rndm2[] = {"A","B","C","D"};
{rnd2 = rndm2[(int) (Math.random() * rndm2.length)];}
String rndm3[] = {"A","B","C","D"};
{rnd3 = rndm3[(int) (Math.random() * rndm3.length)];}
String rndm4[] = {"A","B","C","D"};
{rnd4 = rndm4[(int) (Math.random() * rndm4.length)];}
{Toast.makeText(getApplicationContext(),"button pressed", Toast.LENGTH_SHORT).show();}
{Button tv = (Button) findViewById(R.id.reel1);
tv.setText(String.valueOf(rnd));
tv.setTextColor(Color.parseColor("#000000"));}
{Button tv = (Button) findViewById(R.id.reel2);
tv.setText(String.valueOf(rnd2));
tv.setTextColor(Color.parseColor("#000000"));}
{Button tv = (Button) findViewById(R.id.reel3);
tv.setText(String.valueOf(rnd3));
tv.setTextColor(Color.parseColor("#000000"));}
{Button tv = (Button) findViewById(R.id.reel4);
tv.setText(String.valueOf(rnd4));
tv.setTextColor(Color.parseColor("#000000"));
我将随机字符串移至 Onclick 事件中，并删除了私有(private)和静态部分。然后哇啦!事情就像一个魅力!
关于java - 单击按钮时生成随机整数，无需刷新 Activity ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40824287/