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Android底部菜单栏实现的实例代码

 Android 使用RadioGroup 实现底部导航菜单栏。

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一、主界面布局的实现：

先来张效果图：

Android底部菜单栏实现的实例代码

介绍一下总体界面包括的内容：底部五个导航按钮，主界面包括一个FrameLayout用来放五个Fragment。点击底部按钮会对应跳转到指定的界面。

实现布局：activity_main.xml

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

编写selector 用来设置点击后的背景变化：

x_nav_menu_fs.xml，x_nav_menu_gw.xml，x_nav_menu_sq.xml，x_nav_menu_sy.xml，x_nav_menu_wd.xml

例如x_nav_menu_sy.xml文件的书写为：

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

编写文字点击后颜色的变化drawable:x_nav_menu_color.xml

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

编写底部菜单栏背景的drawablebt_tag_bg.xml:

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

按照上述方式的就完成了底部菜单栏的布局方式，同时在布局的时候我们为每个RadioButton设置了点击监听器，监听方法是：switchView(View view)。

二、布局的代码实现

创建五个fragment,分别对应每个按钮的界面，Fragment的代码非常简单，例如下面一个Fragment：

package com.garvey.modules;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.garvey.babyshop.R;
/**
 * 作者： Garvey on 2016/6/13.
 * 邮箱： lianjiawei18@163.com
 */
public class ShouYeFragment extends Fragment{
 // 缓存Fragment view
 private View rootView;
 private static ShouYeFragment shouYeFragment;
 public ShouYeFragment(){}
 public static ShouYeFragment getNewInstance(){
 if (shouYeFragment ==null){
 shouYeFragment =new ShouYeFragment();
 }
 return shouYeFragment;
 }
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 }
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 if (rootView == null) {
 rootView = inflater.inflate(R.layout.fragment_shouye, container, false);
 }
 // 缓存的rootView需要判断是否已经被加过parent，
 // 如果有parent需要从parent删除，要不然会发生这个rootview已经有parent的错误。
 ViewGroup parent = (ViewGroup) rootView.getParent();
 if (parent != null) {
 parent.removeView(rootView);
 }
 return rootView;
 }
 @Override
 public void onResume() {
 super.onResume();
 }
}

然后编写MainActivity的代码，首先确立界面对应的索引：

 public static final int VIEW_SHOUYE_INDEX = 0;
 public static final int VIEW_GOUWU_INDEX = 1;
 public static final int VIEW_FENGSHANG_INDEX = 2;
 public static final int VIEW_SHEQU_INDEX = 3;
 public static final int VIEW_WODE_INDEX = 4;
 private int temp_position_index = -1;

然后书写对应的switchView(View view )方法来实现对应的界面切换：

public void switchView(View view) {
 switch (view.getId()) {
 case R.id.id_nav_btshouye:
 if (temp_position_index != VIEW_SHOUYE_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, syFragemnt);
  mTransaction.commit();
 }
 temp_position_index = VIEW_SHOUYE_INDEX;
 break;
 case R.id.id_nav_btgouwu:
 if (temp_position_index != VIEW_GOUWU_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, gwFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_GOUWU_INDEX;
 break;
 case R.id.id_nav_btfengshang:
 if (temp_position_index != VIEW_FENGSHANG_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, fsFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_FENGSHANG_INDEX;
 break;
 case R.id.id_nav_btshequ:
 if (temp_position_index != VIEW_SHEQU_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, sqFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_SHEQU_INDEX;
 break;
 case R.id.id_nav_btwode:
 if (temp_position_index != VIEW_WODE_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, wdFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_WODE_INDEX;
 break;
 }
 }

MainActivity的总代码如下：

package com.garvey.activitys;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.RadioGroup;
import com.garvey.babyshop.R;
import com.garvey.modules.FengShangFragment;
import com.garvey.modules.GouWuFragment;
import com.garvey.modules.SheQuFragment;
import com.garvey.modules.ShouYeFragment;
import com.garvey.modules.WoDeFragment;
public class MainActivity extends AppCompatActivity {
 /**
 * 底部导航栏的widdget
 */
 private RadioGroup mNavGroup;
 private FragmentTransaction mTransaction;
 /**
 * 五个Fragments
 */
 Fragment syFragemnt, gwFragment, fsFragment, sqFragment, wdFragment;
 public static final int VIEW_SHOUYE_INDEX = 0;
 public static final int VIEW_GOUWU_INDEX = 1;
 public static final int VIEW_FENGSHANG_INDEX = 2;
 public static final int VIEW_SHEQU_INDEX = 3;
 public static final int VIEW_WODE_INDEX = 4;
 private int temp_position_index = -1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 initView();
 }

 private void initView() {
 mNavGroup = (RadioGroup) findViewById(R.id.id_navcontent);
 syFragemnt = ShouYeFragment.getNewInstance();
 gwFragment = GouWuFragment.getNewInstance();
 fsFragment = FengShangFragment.getNewInstance();
 sqFragment = SheQuFragment.getNewInstance();
 wdFragment = WoDeFragment.getNewInstance();
 //显示
 mTransaction = getSupportFragmentManager().beginTransaction();
 mTransaction.replace(R.id.id_fragment_content, syFragemnt);
 mTransaction.commit();
 }
 public void switchView(View view) {
 switch (view.getId()) {
 case R.id.id_nav_btshouye:
 if (temp_position_index != VIEW_SHOUYE_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, syFragemnt);
  mTransaction.commit();
 }
 temp_position_index = VIEW_SHOUYE_INDEX;
 break;
 case R.id.id_nav_btgouwu:
 if (temp_position_index != VIEW_GOUWU_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, gwFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_GOUWU_INDEX;
 break;
 case R.id.id_nav_btfengshang:
 if (temp_position_index != VIEW_FENGSHANG_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, fsFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_FENGSHANG_INDEX;
 break;
 case R.id.id_nav_btshequ:
 if (temp_position_index != VIEW_SHEQU_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, sqFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_SHEQU_INDEX;
 break;
 case R.id.id_nav_btwode:
 if (temp_position_index != VIEW_WODE_INDEX) {
  //显示
  mTransaction = getSupportFragmentManager().beginTransaction();
  mTransaction.replace(R.id.id_fragment_content, wdFragment);
  mTransaction.commit();
 }
 temp_position_index = VIEW_WODE_INDEX;
 break;
 }
 }
}

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