//第一種
    button.setOnClickListener(new OnClickListener() {
    			@Override
    			public void onClick(View v) {
    				//獲取單選框id
    				int id = radioGroup.getCheckedRadioButtonId();
    				if (id==R.id.radio1) {
    					sex = "男";
    				} else if(id==R.id.radio2){
    					sex = "女";
    				}else {
    					sex = "未知";
    				}
    				Toast.makeText(MainActivity.this, "您選擇的性別是："+sex, Toast.LENGTH_SHORT).show();
    			}
    		});
    	}

private void initView() {
		button = (Button) findViewById(R.id.btn);
		radioGroup = (RadioGroup) findViewById(R.id.group);
	}
 

> 第二種



button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				//用陣列的按鈕獲取單選按鈕的值
				radioButton = (RadioButton) findViewById(radioGroup.getCheckedRadioButtonId());
				Toast.makeText(MainActivity.this,"您獲取的值是："+radioButton.getText(), Toast.LENGTH_SHORT).show();
			}	
		});
	}