RadioGroup音樂按鈕工具條

xml文件：

<RadioGroup android:id="@+id/MusicList_RadioGroup"
                android:orientation="horizontal" android:layout_alignParentBottom="true"
                android:layout_width="match_parent" android:layout_height="wrap_content"
                android:padding="2.0dip"
                android:background="@drawable/radiogroup_bg"
                >
       
        <RadioButton android:id="@+id/MusicList_RadioGroup_next" 
                     android:drawableLeft="@drawable/radiogroup_next"
                     android:text="@string/Text_radiogroup_next"
                     android:textSize="15.0dip"
                     android:layout_weight="1.0" android:button="@null"
                     android:layout_width="wrap_content" android:layout_height="wrap_content"
                     />        
        <RadioButton android:id="@+id/MusicList_RadioGroup_playAndpuse" 
                     android:drawableLeft="@drawable/radiogroup_play"
                     android:text="@string/Text_radiogroup_play"
                     android:textSize="15.0dip"
                     android:layout_weight="1.0" android:button="@null"
                     android:layout_width="wrap_content" android:layout_height="wrap_content"
                     />                
        <RadioButton android:id="@+id/MusicList_RadioGroup_previous" 
                     android:drawableLeft="@drawable/radiogroup_previous"
                     android:text="@string/Text_radiogroup_previous"
                     android:textSize="15.0dip"
                     android:layout_weight="1.0" android:button="@null" 
                     android:layout_width="wrap_content" android:layout_height="wrap_content"
                     />            
    </RadioGroup>

綁定監聽事件：

 //綁定監聽器
        MusicListTable_RadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){
            public void onCheckedChanged(RadioGroup arg0, int rid) {
                switch(rid)
                {
                    case R.id.MusicList_RadioGroup_next://下一首
                        break;
                    case R.id.MusicList_RadioGroup_previous://上一首
                        break;
                    case R.id.MusicList_RadioGroup_playAndpuse://播放或暫停
                        if(isPlaying)
                        {
                            Drawable dr= res.getDrawable(R.drawable.radiogroup_play);
                            //setBounds如果不設置的話setCompoundDrawables就會沒有圖片顯示出來，所以一定要設置一次
                            dr.setBounds(0, 0, dr.getMinimumWidth(), dr.getMinimumHeight());
                            palyAndpuse.setCompoundDrawables(dr, null,null, null);//爲RadioButton設置圖片，左右上下對應xml的android:drawableLeft="@drawable/XXX"
                            isPlaying=false; 
                        }
                        else
                        {
                            Drawable dr= res.getDrawable(R.drawable.radiogroup_puse);
                            dr.setBounds(0, 0, dr.getMinimumWidth(), dr.getMinimumHeight());
                            palyAndpuse.setCompoundDrawables(dr, null,null, null);
                            isPlaying=true;                 
                        }
                        arg0.clearCheck();//清除選擇，如果不清除的話不能重複選擇同一個Radiobutton
                        break;
                }
                
            }});
    }

效果：