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：

<?xml version="1.0" encoding="utf-8"?>

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。

布局：

style

代码

状态的设置

DownLoad Demo

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