使用Bottom Navigation Activity实现Android底部导航栏
16lz
2021-01-23
最近看到Android Studio里新建Activity时共选择模板中Bottom Navigation Activity可以实现Android底部导航的效果，在网上没啥参考资料，于是自己搞个教程方便大家学习指正哈。话不多说，直接效果图:（Android Studio：2.3.1）
步骤：
1.新建Bottom Navigation Activity,包含layout文件activity_navigation.xml和class文件NavigationActivity：
activity_navigation.xml代码：
<?xml version="1.0" encoding="utf-8"?> NavigationActivity.java代码：
package com.lin.coursetwo;import android.app.FragmentTransaction;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.design.widget.BottomNavigationView;import android.support.v7.app.AppCompatActivity;import android.view.MenuItem;import android.widget.TextView;import com.lin.coursetwo.fragment.FragmentOne;import com.lin.coursetwo.fragment.FragmentThree;import com.lin.coursetwo.fragment.FragmentTwo;public class NavigationActivity extends AppCompatActivity { private TextView mTextMessage; private FragmentOne fragmentOne; private FragmentTwo fragmentTwo; private FragmentThree fragmentThree; private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener = new BottomNavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(@NonNull MenuItem item) { switch (item.getItemId()) { case R.id.navigation_home: mTextMessage.setText(R.string.title_home); showNav(R.id.navigation_home); return true; case R.id.navigation_dashboard: mTextMessage.setText(R.string.title_dashboard); showNav(R.id.navigation_dashboard); return true; case R.id.navigation_notifications: mTextMessage.setText(R.string.title_notifications); showNav(R.id.navigation_notifications); return true; } return false; } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_navigation); init(); mTextMessage = (TextView) findViewById(R.id.message); BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation); navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener); } //init（）用来初始化组件 private void init(){ fragmentOne=new FragmentOne(); fragmentTwo=new FragmentTwo(); fragmentThree=new FragmentThree(); FragmentTransaction beginTransaction=getFragmentManager().beginTransaction(); beginTransaction.add(R.id.content,fragmentOne).add(R.id.content,fragmentTwo).add(R.id.content,fragmentThree);//开启一个事务将fragment动态加载到组件 beginTransaction.hide(fragmentOne).hide(fragmentTwo).hide(fragmentThree);//隐藏fragment beginTransaction.addToBackStack(null);//返回到上一个显示的fragment beginTransaction.commit();//每一个事务最后操作必须是commit（），否则看不见效果 showNav(R.id.navigation_home); } private void showNav(int navid){ FragmentTransaction beginTransaction=getFragmentManager().beginTransaction(); switch (navid){ case R.id.navigation_home: beginTransaction.hide(fragmentTwo).hide(fragmentThree); beginTransaction.show(fragmentOne); beginTransaction.addToBackStack(null); beginTransaction.commit(); break; case R.id.navigation_dashboard: beginTransaction.hide(fragmentOne).hide(fragmentThree); beginTransaction.show(fragmentTwo); beginTransaction.addToBackStack(null); beginTransaction.commit(); break; case R.id.navigation_notifications: beginTransaction.hide(fragmentTwo).hide(fragmentOne); beginTransaction.show(fragmentThree); beginTransaction.addToBackStack(null); beginTransaction.commit(); break; } }}2.新建三个Fragment类：FragmentOne、FragmentTwo、FragmentThree和对应的三个layout文件：fragment_one.xml、fragment_two.xml、fragment_three.xml
FragmentOne代码：
package com.lin.coursetwo.fragment;import android.app.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.lin.coursetwo.R;public class FragmentOne extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { View view=inflater.inflate(R.layout.fragment_one,container,false); return view; }}FragmentTwo代码：
package com.lin.coursetwo.fragment;import android.app.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.lin.coursetwo.R;public class FragmentTwo extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { View view=inflater.inflate(R.layout.fragment_two,container,false); return view; }}FragmentThree代码：
package com.lin.coursetwo.fragment;import android.app.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.lin.coursetwo.R;public class FragmentThree extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { View view=inflater.inflate(R.layout.fragment_three,container,false); return view; }}fragment_one.xml代码：
<?xml version="1.0" encoding="utf-8"?> fragment_two.xml代码：
<?xml version="1.0" encoding="utf-8"?> fragment_three.xml代码：
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