Android底部导航栏实现（二）之RadioGroup

这里简单记录一下Android底部导航栏通过RadioGroup+Fragment的实现。

布局：

这里的drawableTop使用了状态选择器

style

代码

初始化的代码就不记录了，都是一些findViewById,实现过程无非就是对RadioButton进行监听一下：

mRadioGroup.setOnCheckedChangeListener(this);


    @Override
    public void onCheckedChanged(RadioGroup group, int checkId) {
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        switch (checkId) {
            case R.id.rb_home:
                if (mHomeFragment == null) {
                    mHomeFragment = HomeFragment.newInstance(getString(R.string.item_home));
                }
                transaction.replace(R.id.sub_content, mHomeFragment);
                break;
            case R.id.rb_location:
                if (mLocationFragment == null) {
                    mLocationFragment = LocationFragment.newInstance(getString(R.string.item_location));
                }
                transaction.replace(R.id.sub_content, mLocationFragment);
                break;
            case R.id.rb_like:
                if (mLikeFragment == null) {
                    mLikeFragment = LikeFragment.newInstance(getString(R.string.item_like));
                }
                transaction.replace(R.id.sub_content, mLikeFragment);
                break;
            case R.id.rb_me:
                if (mPersonFragment == null) {
                    mPersonFragment = PersonFragment.newInstance(getString(R.string.item_person));
                }
                transaction.replace(R.id.sub_content, mPersonFragment);
                break;
        }
        setTabState();//设置状态
        transaction.commit();
    }

状态的设置

    private void setTabState() {
        setHomeState();
        setLocationState();
        setLikeState();
        setMeState();

    }

    /**
     * set tab home state
     */
    private void setHomeState() {
        if (mRadioHome.isChecked()) {
            mRadioHome.setTextColor(ContextCompat.getColor(getActivity(), R.color.colorPrimary));
        } else {
            mRadioHome.setTextColor(ContextCompat.getColor(getActivity(), R.color.black));
        }
    }

    private void setLocationState() {
        if (mRadioLocation.isChecked()) {
            mRadioLocation.setTextColor(ContextCompat.getColor(getActivity(), R.color.colorPrimary));
        } else {
            mRadioLocation.setTextColor(ContextCompat.getColor(getActivity(), R.color.black));
        }
    }

    private void setLikeState() {
        if (mRadioLike.isChecked()) {
            mRadioLike.setTextColor(ContextCompat.getColor(getActivity(), R.color.colorPrimary));
        } else {
            mRadioLike.setTextColor(ContextCompat.getColor(getActivity(), R.color.black));
        }
    }

    private void setMeState() {
        if (mRadioMe.isChecked()) {
            mRadioMe.setTextColor(ContextCompat.getColor(getActivity(), R.color.colorPrimary));
        } else {
            mRadioMe.setTextColor(ContextCompat.getColor(getActivity(), R.color.black));
        }
    }

这里需要注意的是， setDefaultFragment();我写在onCreateVew里面并没有生效。这里我写在了onStart()方法里了。

  @Override
    public void onStart() {
        setDefaultFragment();//写在onCreateView里面，当页面跑到其他Fragment再回来就不会生效
        super.onStart();
    }

说明：这几篇文章没有过多的文字叙述，因为这些东西也不是很难，而且都是常用的，相信很多人都了如指掌了，多说亦是废话，直接上代码看的反而更清楚。

DownLoad Demo