android底部导航栏的优化

来源：互联网发布：java snmp流量监控编辑：程序博客网时间：2024/05/16 11:31

对于导航栏(RadioButton+Fragment)点击返回Fragment时重新加载数据的现象,进行了优化,给用户流畅的体验
xml代码:

<RadioGroup        android:layout_alignParentBottom="true"        android:id="@+id/footer_menu_radiogroup"        android:layout_width="match_parent"        android:layout_height="59dp"        android:orientation="horizontal"        android:gravity="center_vertical">        <RadioButton            android:id="@+id/footer_query"            android:text="首页"            style="@style/radioStyle"            android:checked="true"            android:drawableTop="@drawable/current_selector"/>        <RadioButton            android:id="@+id/footer_search"            android:text="搜索"            style="@style/radioStyle"            android:drawableTop="@drawable/bottom_search"/>        <RadioButton            android:id="@+id/footer_current"            android:text="实时"            style="@style/radioStyle"            android:drawableTop="@drawable/query_selector"/>        <RadioButton            android:id="@+id/footer_my"            android:text="我"            style="@style/radioStyle"            android:drawableTop="@drawable/current_my"/>    </RadioGroup>

Java代码:

  @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        initRadioGroup();    }    private void initData() {        HomePageFragment homePageFragment=new HomePageFragment();        SearchFragment searchFragment=new SearchFragment();        CurrentFragment currentFragment=new CurrentFragment();        MyFragment myFragment=new MyFragment();        fragments.add(homePageFragment);        fragments.add(searchFragment);        fragments.add(currentFragment);        fragments.add(myFragment);        //默认显示第一个Fragment        getSupportFragmentManager().beginTransaction().add(R.id.main_content,homePageFragment).commit();    private void initRadioGroup() {        tv = ((TextView) findViewById(R.id.title_text));        footer_menu_radiogroup = (RadioGroup)findViewById(R.id.footer_menu_radiogroup);        footer_menu_radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId){                    case R.id.footer_current:                        changeFragment(2);                        tv.setText("实时");                        break;                    case R.id.footer_query:                        changeFragment(0);                        tv.setText("首页");                        break;                    case R.id.footer_search:                        changeFragment(1);                        tv.setText("搜索");                        break;                    case R.id.footer_my:                        changeFragment(3);                        tv.setText("我");                        break;                }            }        });    }    private void changeFragment(int i) {        FragmentTransaction transaction=getSupportFragmentManager().beginTransaction();        Fragment targetFragment=fragments.get(i);        Fragment positionFragment=fragments.get(position);        if(targetFragment.isAdded()){            transaction.show(targetFragment).hide(positionFragment).commit();        }else{            transaction.add(R.id.main_content,targetFragment).hide(positionFragment).commit();        }        position=i;    }

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