Android使用RadioGroup实现底部导航栏
RadioGroup实现底部导航栏效果，如图:：
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实现可最基本的导航栏功能，不能左右滑动，只能点击
1.内嵌的fragment的布局：
<?xml version="1.0" encoding="utf-8"?>
2.fragment的activity代码：
public class FrHome extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = LayoutInflater.from(getContext()).inflate(R.layout.fragment_home, container, false);
return view;
}
}
以此为例根据需要编写不同的fragment布局等等。
3.装载fragment的界面布局如下（其中使用了selector进行实现点击改变图标和文字颜色）：
点击改变文字颜色：
<?xml version="1.0" encoding="utf-8"?>
点击改变图标：
<?xml version="1.0" encoding="utf-8"?>
界面布局：
<?xml version="1.0" encoding="utf-8"?>
4.装载fragment的界面的activity代码（加入双击返回键则退出应用）：
public class ActHome extends FragmentActivity implements RadioGroup.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;
public final static String ACTION_EXIT_SYSTEM = "sys_exit";
private FragmentManager manager;
private FragmentTransaction transaction;
private FrHome frHome;
private FrHealth frHealth;
private FrPersonal frPersonal;
private long mExitTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
ButterKnife.bind(this);
RadioButton tabHome = (RadioButton) tabBar.getChildAt(0);
tabHome.setChecked(true);
tabBar.setOnCheckedChangeListener(this);
initFragment();
}
private void initFragment() {
manager = getSupportFragmentManager();
transaction = manager.beginTransaction();
frHome = new FrHome();
transaction.add(R.id.frame_layout,frHome);
transaction.commit();
}
@Override
public void onCheckedChanged(RadioGroup radioGroup, @IdRes int checkedId) {
switch (checkedId) {
case R.id.tab_home:
FragmentTransaction ft1 = manager.beginTransaction();
hideAll(ft1);
if (frHome!=null){
ft1.show(frHome);
}else {
frHome=new FrHome();
ft1.add(R.id.frame_layout,frHome);
}
ft1.commit();
break;
case R.id.tab_health:
FragmentTransaction ft2 = manager.beginTransaction();
hideAll(ft2);
if (frHealth!=null){
ft2.show(frHealth);
}else {
frHealth = new FrHealth();
ft2.add(R.id.frame_layout,frHealth);
}
ft2.commit();
break;
case R.id.tab_personal:
FragmentTransaction ft5 = manager.beginTransaction();
hideAll(ft5);
if (frPersonal!=null){
ft5.show(frPersonal);
}else {
frPersonal = new FrPersonal();
ft5.add(R.id.frame_layout, frPersonal);
}
ft5.commit();
break;
}
}
private void hideAll(FragmentTransaction ft){
if (ft==null){
return;
}
if (frHome!=null){
ft.hide(frHome);
}
if (frHealth!=null){
ft.hide(frHealth);
}
if (frPersonal!=null){
ft.hide(frPersonal);
}
}
@Override
public void onBackPressed() {
if ((System.currentTimeMillis() - mExitTime) > 2000) {
Toast.makeText(ActHome.this,"再按一次退出程序",Toast.LENGTH_SHORT).show();
mExitTime = System.currentTimeMillis();
} else {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
onExit(ActHome.this);
}
}, 500);
}
}
public static void onExit(final Context context) {
try {
Intent intent = new Intent();
intent.setAction(context.getApplicationContext().getPackageName() + ACTION_EXIT_SYSTEM);
context.sendBroadcast(intent);
// MobclickAgent.onKillProcess(context);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
System.exit(0);
}
}, 200);
} catch (Exception e) {
e.printStackTrace();
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
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