badgeView = new BadgeView(this);
 //btn是控件
 badgeView.setTargetView(btn);
 //设置相对位置
 badgeView.setBadgeMargin(0, 5, 15, 0);
 //设置显示未读消息条数
 badgeView.setBadgeCount(2);

 <RadioGroup
 android:id="@+id/main_radio"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="bottom"
 android:background="#121212"
 android:gravity="center_vertical"
 android:orientation="horizontal">

 <RadioButton
 android:id="@+id/radio_button0"
 style="@style/main_tab_bottom"
 android:layout_marginTop="5.0dip"
 android:drawableTop="@drawable/home_btn_1"
 android:text="@string/main_home"
 android:textColor="@drawable/color_radiobtton"
 android:textSize="10.0sp" />
 </RadioGroup>
 <!-- 实现提醒信息用的 -->
 <LinearLayout
 android:layout_width="fill_parent"
 android:layout_height="50dp"
 android:background="#00000000"
 android:orientation="horizontal"
 >
 <Button
 android:layout_width="0dp"
 android:layout_height="fill_parent"
 android:layout_weight="1"
 android:clickable="false"
 android:background="#00000000" />
 </LinearLayout>