RadioGroup实现底部导航栏效果,如图::
, 
& lt; & # 63; xml version=" 1.0 " encoding=" utf - 8 " & # 63;比;
& lt; LinearLayout xmlns: android=" http://schemas.android.com/apk/res/android "
android:取向=按怪薄盿ndroid: layout_width=癿atch_parent”
android: layout_height=癿atch_parent”比;
& lt; TextView
android: layout_width=" match_parent "
android: layout_height=" match_parent "
android:重力="中心"
android: textSize=" 50 sp”
android:输入textColor=" @color/colorPrimary”
android:文本=凹摇?比;
& lt;/LinearLayout>
之前
2.片段的活动代码:
公开课FrHome延伸片段{
@Nullable
@Override
公众视野>
& lt; & # 63; xml version=" 1.0 " encoding=" utf - 8 " & # 63;比;
& lt;选择xmlns: android=" http://schemas.android.com/apk/res/android "比;
& lt;项目android: state_checked=" true " android:颜色=" # 3 f51b5 "/比;
& lt;项目android: state_checked=" false " android:颜色=" # 8 f8f8f "/比;
& lt;/selector>
之前
点击改变图标:
& lt; & # 63; xml version=" 1.0 " encoding=" utf - 8 " & # 63;比;
& lt;选择xmlns: android=" http://schemas.android.com/apk/res/android "比;
& lt;项目android: state_checked=" true " android:可拉的=癅mipmap/ic_history_checked”/比;
& lt;项目android: state_checked=" false " android:可拉的=癅mipmap/ic_history_unchecked”/比;
& lt;/selector>
之前
界面布局:
& lt; & # 63; xml version=" 1.0 " encoding=" utf - 8 " & # 63;比;
& lt; RelativeLayout xmlns: android=" http://schemas.android.com/apk/res/android "
xmlns:工具=" http://schemas.android.com/tools "
android: layout_width=" match_parent "
android: layout_height=" match_parent "
xmlns:应用=" http://schemas.android.com/apk/res-auto "
工具:上下文=癱om.lotus.chartspagedemo.ActHome”比;
& lt; FrameLayout
android: id=癅 + id/frame_layout”
android: layout_width=" match_parent "
android: layout_above=癅 + id/card_view”
android: layout_height=" match_parent "/比;
& lt; android.support.v7.widget.CardView
android: id=癅 + id/card_view”
应用:cardElevation=" 25 dp "
android: layout_alignParentBottom=" true "
android: layout_width=" match_parent "
android: layout_height=皐rap_content”比;
& lt; RadioGroup
android: paddingTop=" 5 dp "
android: id=癅 + id/tab_bar”
android:背景=" @color/app_white”
android: layout_width=" match_parent "
android: layout_height=" 60 dp "
android:重力="中心"
面向android:="水平"比;
& lt; RadioButton
android: id=癅 + id/tab_home”
android:重力="中心"
android:按钮=" @null "
android: drawableTop=" @drawable/selector_tab_home”
android: layout_width=" 0 dp”
android: layout_weight=" 1 "
android: layout_height=" match_parent "
android:输入textColor=" @drawable/selector_tab_color”
android:文本="首页”/比;
& lt; RadioButton
android: id=癅 + id/tab_health”
android:重力="中心"
android:按钮=" @null "
android: drawableTop=" @drawable/selector_tab_health”
android: layout_width=" 0 dp”
android: layout_weight=" 1 "
android: layout_height=" match_parent "
android:输入textColor=" @drawable/selector_tab_color”
android:文本="体检测评”/比;
& lt; RadioButton
android: id=癅 + id/tab_personal”
android:重力="中心"
android:按钮=" @null "
android: drawableTop=" @drawable/selector_tab_personal”
android: layout_width=" 0 dp”
android: layout_weight=" 1 "
android: layout_height=" match_parent "
android:输入textColor=" @drawable/selector_tab_color”
android:文本="个人中心”/比;
& lt;/RadioGroup>
& lt;/android.support.v7.widget.CardView>
& lt;/RelativeLayout>
之前
4。装载片段的界面活动的代码(加入双击返回键则退出应用):
公共类ActHome FragmentActivity实现RadioGroup延伸。OnCheckedChangeListener {
@BindView (R.id.frame_layout)
FrameLayout FrameLayout;
@BindView (R.id.tab_home)
RadioButton tabHome;
@BindView (R.id.tab_health)
RadioButton tabHealth;
@BindView (R.id.tab_personal)
RadioButton tabPersonal;
@BindView (R.id.tab_bar)
RadioGroup tabBar;
最后公共静态字符串ACTION_EXIT_SYSTEM=皊ys_exit”;
私人FragmentManager经理;
私人FragmentTransaction事务;
私人FrHome FrHome;
私人FrHealth FrHealth;
私人FrPersonal FrPersonal;
私人长mExitTime;
@Override
保护无效onCreate(包savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_home);
ButterKnife.bind(这个);
RadioButton tabHome=(RadioButton) tabBar.getChildAt (0);
tabHome.setChecked(真正的);
tabBar.setOnCheckedChangeListener(这个);
initFragment ();
}
私人空间initFragment () {
经理=getSupportFragmentManager ();
事务=manager.beginTransaction ();
frHome=new frHome ();
transaction.add (R.id.frame_layout frHome);
transaction.commit ();
}
@Override
公共空间onCheckedChanged (RadioGroup RadioGroup, @IdRes int checkedId) {
开关(checkedId) {
案例R.id.tab_home:
FragmentTransaction ft1=manager.beginTransaction ();
hideAll (ft1);
如果(frHome !=null) {
ft1.show (frHome);
其他}{
frHome=new frHome ();
ft1.add (R.id.frame_layout frHome);
}
ft1.commit ();
打破;
案例R.id.tab_health:
FragmentTransaction ft2=manager.beginTransaction ();
hideAll (ft2);
如果(frHealth !=null) {
ft2.show (frHealth);
其他}{
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