android按钮不起作用

时间:2012-08-08 13:15:04

标签: android

我是android和java的新手,到目前为止一直在做视频教程。然而,在我第一次尝试使用自己的代码时,Buttons似乎没有回应我正在做的任何事情,这是错误的吗?

我已经完成了几个类似的代码并复制并粘贴了一些示例,并且在Android手机和平板电脑上运行的所有示例中都没有Buttons做任何事情。

public class Two extends Activity implements OnClickListener {

    Button showa;
    EditText et1;
    TextView ans1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.two);

        methodInit();
        showa.setOnClickListener(this);
    }
    private void methodInit() {
        // TODO Auto-generated method stub
        showa = (Button) findViewById(R.id.button1);
        et1 = (EditText) findViewById(R.id.et1);
        ans1 = (TextView) findViewById(R.id.ans1);


    }

    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){

    case R.id.button1:
        String check = et1.getText().toString();
        et1.setText(check);
        if (check.contains("4")){
            ans1.setText("correct!!!");
                break;
        }

    }
        }
    }

2 个答案:

答案 0 :(得分:0)

像这样使用

 protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.two);
    methodInit();       
   }
    private void methodInit() {
        // TODO Auto-generated method stub
       showa = (Button) findViewById(R.id.button1);
       et1 = (EditText) findViewById(R.id.et1);
       ans1 = (TextView) findViewById(R.id.ans1);
       showa.setOnClickListener(this);
  }

    public void onClick(View v) {
      // TODO Auto-generated method stub
       switch(v.getId()){

    case R.id.button1:
          String check = et1.getText().toString();
          et1.setText(check);
          if (check.contains("4")){
          ans1.setText("correct!!!");
         break;
      }
     }
    }
  }   

答案 1 :(得分:0)

在第二次查看您的代码后,我注意到您 ARE 实际设置了onClickListener ...我在下面发布的代码对我有用。试一试,看看会发生什么。


您需要在onClickListener上设置Button

看看以下代码:

public class Two extends Activity implements OnClickListener {

    private Button showa;
    private EditText et1;
    private TextView ans1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.two);

        methodInit();
    }
    private void methodInit() {
        // TODO Auto-generated method stub
        showa = (Button) findViewById(R.id.button1);
        et1 = (EditText) findViewById(R.id.et1);
        ans1 = (TextView) findViewById(R.id.ans1);
        showa.setOnClickListener(this);


    }

    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){

        case R.id.button1:
            String check = et1.getText().toString();
            et1.setText(check);
            if (check.contains("4")){
                ans1.setText("correct!!!");
                break;
            }
        }
    }
}