android教程之用户界面---单选按钮RadioButton||多选按钮CheckBox

        Android提供了一个圆形的单选按钮RadioButton,通过它,用户可以进行单选操作.二单选的集合则放在RadioGroup中,在这个集合中,用户只能选中一个RadioButton,而需要注意的是,监听事件要绑定在RadioGroup上,要不然,监听会有意想不到的结果.

radiobutton.xml   [ 其中的@string/....内容大家可以自己填写]

TestRadioGroup.java

public class TestRadioGroup extends Activity{
	private RadioButton rb1,rb2,rb3,rb4;
	private RadioGroup rg;
	private TextView tv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.radiobutton);
		rb1=(RadioButton) this.findViewById(R.id.rb1);
		rb2=(RadioButton) this.findViewById(R.id.rb2);
		rb3=(RadioButton) this.findViewById(R.id.rb3);
		rb4=(RadioButton) this.findViewById(R.id.rb4);
		
		rg=(RadioGroup) this.findViewById(R.id.rg);
		
		tv=(TextView) this.findViewById(R.id.answer);
		
		rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
			
			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				// TODO Auto-generated method stub
				if(checkedId==rb1.getId()){
					tv.setText("恭喜你,答对了!");
				}else{
					tv.setText("正确答案是:A");
				}
			}
		});
	}
}

CheckBox的使用方法更RadioButton差不多,但是它没有组的概念,这里就不介绍了,大家举一反三.

转载于:https://www.cnblogs.com/IntelligentBrain/p/5111300.html