android - 应用程序意外停止请重试？

Question

当我运行下面的代码时，它给出了一条消息:

 the application stopped unexcepctedlly pleas try again

任何人都可以帮助解决这个问题。

public class TheNewActivity extends Activity {
    /** Called when the activity is first created. */
    int counter;
    Button sub,add;
    TextView display;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        add=(Button) findViewById(R.id.button1);
        display=(TextView) findViewById(R.id.dis);

     add.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            counter++;
            display.setText("your total is"+counter);
        }
    }); 
     sub.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            counter--;
            display.setText("your total is"+counter);
        }
    });
    }
}

Answer 1

这里没有子按钮 Reference like this add=(Button) findViewById(R.id.button1);

谢谢