我的应用程序有一个问题列表。当调用functoion getfirstquestion时，它会随机选择一个问题，然后随机地将文本放在4个按钮中的每个按钮上（其中一个是问题的答案）。 / p>
每次按下按钮，函数checkanswer将验证按钮文本是否与正确问题的正确答案相等。如果是，则删除当前问题，并调用getfirstquestion（）函数来更改问题。 / p>
程序运行正常，但是当我按下正确的答案按钮时没有任何反应。任何人都可以告诉我原因，并给我一个解决方案？我在2小时前搜索代码....
public class startgame extends Activity implements OnClickListener{
final Random rgenerator = new Random();
List<String> questionss1 = new ArrayList<String>();
String thequestion;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.level1);
questionss1.add("Who is the actual CEO at Apple?");
questionss1.add("Who is the actual CEO at Microsoft?");
questionss1.add("Who is the actual CEO at Google?");
getfirstquestion();
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(this);
Button button2 = (Button)findViewById(R.id.button2);
button2.setOnClickListener(this);
Button button3 = (Button)findViewById(R.id.button3);
button3.setOnClickListener(this);
Button button4 = (Button)findViewById(R.id.button4);
button4.setOnClickListener(this);
}
}
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.button1:
Button button1 = (Button)findViewById(R.id.button1);
checkanswer((String) button1.getText());
case R.id.button2:
Button button2 = (Button)findViewById(R.id.button2);
checkanswer((String) button2.getText());
case R.id.button3:
Button button3 = (Button)findViewById(R.id.button2);
checkanswer((String) button3.getText());
case R.id.button4:
Button button4 = (Button)findViewById(R.id.button2);
checkanswer((String) button4.getText());
}
}
public int checkanswer(String buttontext) {
if (thequestion.equals("Who is the actual CEO at Apple?") && buttontext == "Tim Cook"){
questionss1.remove("Who is the actual CEO at Apple?");
getfirstquestion();
}
if (thequestion.equals("Who is the actual CEO at Microsoft?") && buttontext == "Steve Ballmer"){
questionss1.remove("Who is the actual CEO at Microsoft?");
getfirstquestion();
}
if (thequestion.equals("Who is the actual CEO at Google?") && buttontext == "Eric Schmidt"){
questionss1.remove("Who is the actual CEO at Google?");
getfirstquestion();
}
return 0;
}
public void getfirstquestion(){
//create the buttons
Button button1 = (Button)findViewById(R.id.button1);
Button button2 = (Button)findViewById(R.id.button2);
Button button3 = (Button)findViewById(R.id.button3);
Button button4 = (Button)findViewById(R.id.button4);
thequestion = questionss1.get(rgenerator.nextInt(questionss1.size()));
TextView question = (TextView)findViewById(R.id.textView1);
question.setText(thequestion);
questionss1.remove(thequestion);
if (thequestion.equals("Who is the actual CEO at Apple?")){
List<String> questions1res = new ArrayList<String>();
questions1res.add("Eric Schmidt");
questions1res.add("Steven Sinofsky");
questions1res.add("Tim Cook");
questions1res.add("Steve Ballmer");
button1.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button1.getText());
button2.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button2.getText());
button3.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button3.getText());
button4.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button4.getText());
}
if (thequestion.equals("Who is the actual CEO at Microsoft?")){
List<String> questions1res = new ArrayList<String>();
questions1res.add("Eric Schmidt");
questions1res.add("Steven Sinofsky");
questions1res.add("Tim Cook");
questions1res.add("Steve Ballmer");
button1.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button1.getText());
button2.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button2.getText());
button3.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button3.getText());
button4.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button4.getText());
}
if (thequestion.equals("Who is the actual CEO at Google?")){
List<String> questions1res = new ArrayList<String>();
questions1res.add("Eric Schmidt");
questions1res.add("Steven Sinofsky");
questions1res.add("Tim Cook");
questions1res.add("Steve Ballmer");
button1.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button1.getText());
button2.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button2.getText());
button3.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button3.getText());
button4.setText(questions1res.get(rgenerator.nextInt(questions1res.size())));
questions1res.remove(button4.getText());
}
}
}
答案 0 :(得分：3)
在方法checkanswer中，您应该使用equals方法，而不是==运算符，因为它会比较引用而不是对象的内容。即代替buttontext == "Tim Cook"，它应该是buttontext.equals("Tim Cook")等。
此外，再次查看代码，您应该在交换机中添加break;语句：
switch (v.getId()){
case R.id.button1:
Button button1 = (Button)findViewById(R.id.button1);
checkanswer((String) button1.getText());
break;
case R.id.button2:
Button button2 = (Button)findViewById(R.id.button2);
checkanswer((String) button2.getText());
break;
case R.id.button3:
Button button3 = (Button)findViewById(R.id.button2);
checkanswer((String) button3.getText());
break;
case R.id.button4:
Button button4 = (Button)findViewById(R.id.button2);
checkanswer((String) button4.getText());
break;
}
答案 1 :(得分：1)
button1.setOnClickListener（本）;
此代码用于将OnClickListener设置为按钮。您需要在类中实例化OnClickListener并使用它。传入（此）将传递活动。在这种情况下，按钮单击将不执行任何操作。
这样的事情：
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// do your checking here
}
};
试试看，让我知道它是如何运作的。