4月23日

导航栏

BottomNavigationView + Fragment
 布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<FrameLayout
android:id="@+id/fl_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/bottomNavigationView" />

<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottomNavigationView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:layout_alignParentBottom="true"
app:itemTextColor="@drawable/bottom_navigation_item_selector"
app:menu="@menu/main_bottom_navigation" />

</RelativeLayout>

3. main_bottom_navigation.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/menu_message"
android:enabled="true"
android:icon="@drawable/sel_home"
android:title="首页"
app:showAsAction="ifRoom" />
<item
android:id="@+id/menu_contacts"
android:enabled="true"
android:icon="@drawable/sel_mine"
android:title="我的"
app:showAsAction="ifRoom" />
</menu>

4. 代码
public class MainActivity extends BaseActivity {
private HomeFragment mHomeFragment = HomeFragmentFactory.getInstance().getHomeFragment();
private MineFragment mMineFragment = HomeFragmentFactory.getInstance().getMineFragment();

private List<Fragment> mFragments = new ArrayList<>();

@BindView(R.id.bottomNavigationView)
BottomNavigationView mNavigationView;

@Override
public int getLayoutId() {
return R.layout.activity_main;
}

@Override
public void initView() {
mFragments.add(mHomeFragment);
mFragments.add(mMineFragment);

mNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switchFragment(item.getItemId());
return true;
}
});

switchFragment(R.id.menu_message);
}

/**
* 切换fragment
*
* @param id
* @return
*/
private void switchFragment(int id) {
Fragment fragment = null;
switch (id) {
case R.id.menu_message:
fragment = mFragments.get(0);
break;

case R.id.menu_contacts:
fragment = mFragments.get(1);
break;

default:
break;
}
if (fragment != null) {
getSupportFragmentManager().beginTransaction().replace(R.id.fl_content,fragment).commit();
}
}

}