點擊radiobutton 背景變色

radio_Group設置一個點擊事件

radio_Group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                switch (i) {
                    case R.id.rb_baidu:

                        rb_Baidu.setBackgroundDrawable(getResources().getDrawable(R.drawable.jia));
                        rb_Lunbo.setBackgroundDrawable(getResources().getDrawable(R.drawable.li));
                        rb_Nanian.setBackgroundDrawable(getResources().getDrawable(R.drawable.li));
                        break;//嗯嗯  有兩種辦法，一種是寫代碼，有點臃腫，但是理解起來簡單    還有一種使用xml比較簡單
                    case R.id.rb_lunbo:

                        rb_Baidu.setBackgroundDrawable(getResources().getDrawable(R.drawable.li));
                        rb_Lunbo.setBackgroundDrawable(getResources().getDrawable(R.drawable.jia));
                        rb_Nanian.setBackgroundDrawable(getResources().getDrawable(R.drawable.li));
                        break;


                    case R.id.rb_nanian:

                        rb_Baidu.setBackgroundDrawable(getResources().getDrawable(R.drawable.li));
                        rb_Lunbo.setBackgroundDrawable(getResources().getDrawable(R.drawable.li));
                        rb_Nanian.setBackgroundDrawable(getResources().getDrawable(R.drawable.jia));;
                        break;
                }
            }
        });