Android如何美化底部菜单栏-创新互联

创新互联www.cdcxhl.cn八线动态BGP香港云服务器提供商，新人活动买多久送多久，划算不套路！

这篇文章主要讲解了Android如何美化底部菜单栏，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

众所周知，android的底部菜单栏太重要，平时项目一般都是需要用到的，但是网上关于这方面的demo做得太丑了，实在惨不忍睹，所以这里便用RadioGroup+Fragment的方式写了一个，顺便美化了一下，需要的可以看下。

效果图：

项目结构

MainActivity.java

public class MainActivity extends AppCompatActivity {
 
  private FrameLayout frameLayout;
  private RadioGroup radioGroup;
  private Fragment[] mFragments;
  private int mIndex;
 
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initFragment();
    setRadioGroupListener();
 
 
  }
 
  private void initFragment() {
    radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
    frameLayout = (FrameLayout) findViewById(R.id.fl_content);
    HomeFragment homeFragment = new HomeFragment();
    ShopFragment shopFragment = new ShopFragment();
    LiveFragment liveFragment = new LiveFragment();
    ShoppingCarFragment shoppingCarFragment = new ShoppingCarFragment();
    MineFragment mineFragment = new MineFragment();
    //添加到数组
    mFragments = new Fragment[]{homeFragment, shopFragment, liveFragment, shoppingCarFragment, mineFragment};
    //开启事务
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    //添加首页
    ft.add(R.id.fl_content, homeFragment).commit();
    //默认设置为第0个
    setIndexSelected(0);
  }
 
  private void setIndexSelected(int index) {
    if (mIndex == index) {
      return;
    }
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction ft = fragmentManager.beginTransaction();
    //隐藏
    ft.hide(mFragments[mIndex]);
    //判断是否添加
    if (!mFragments[index].isAdded()) {
      ft.add(R.id.fl_content, mFragments[index]).show(mFragments[index]);
    } else {
      ft.show(mFragments[index]);
    }
    ft.commit();
    //再次赋值
    mIndex = index;
 
  }
 
  private void setRadioGroupListener() {
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(RadioGroup radioGroup, int i) {
        switch (i) {
          case R.id.rb_home:
            setIndexSelected(0);
            break;
          case R.id.rb_shop:
            setIndexSelected(1);
            break;
          case R.id.rb_live:
            setIndexSelected(2);
            break;
          case R.id.rb_shopping_car:
            setIndexSelected(3);
            break;
          case R.id.rb_mine:
            setIndexSelected(4);
            break;
          default:
            setIndexSelected(0);
            break;
        }
      }
    });
  }
 
  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
      //仅当activity为task根（即首个启动activity）时才生效,这个方法不会改变task中的activity状态，
      // 按下返回键的作用跟按下HOME效果一样；重新点击应用还是回到应用退出前的状态；
      moveTaskToBack(false);
      return true;
    }
    return super.onKeyDown(keyCode, event);
  }
}