我编写了以下代码并编译了它，但是当我运行该应用程序时，我收到错误android the application has stopped unexpectedly force close eclipse。我认为这是因为我没有初始化 Button 和 TextView 对象，但是当我初始化它们时，我丢失了令牌“;” 错误。这个错误的原因是什么。
package com.umer.first.project;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class StartingPoint extends Activity {
int counter;
TextView display;
Button add, sub;
//add= new Button(this);
//sub=new Button(this);
//display=new TextView();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_point);
add= (Button) findViewById(R.id.aButton);
sub = (Button) findViewById(R.id.sButton);
display= (Button) findViewById(R.id.tvButton);
add.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
counter++;
display.setText("The total is " + counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
counter--;
display.setText("You counter is " + counter);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_starting_point, menu);
return true;
}
}