底部菜单栏的实现
底部菜单栏两种实现方法：ViewPager:可滑动的界面；Fragment:固定的界面。
首先，页面布局，在除去顶部toolbar之后，将主界面分为两部分，一部分为界面显示区，另一部分作为底部菜单栏。
xml布局文件：content_main.xml(主页面除去toolbar后剩余部分)
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"> <FrameLayout
android:id="@+id/fl_content"
android:layout_width="match_parent"
android:background="#ffffff"
android:layout_height="0dp"
android:layout_weight="1">
</FrameLayout> <include layout="@layout/activity_bottom"/>
</LinearLayout>
activity_bottom.xml（底部菜单栏布局，将菜单栏分为两部分，图片和文字）
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
> <LinearLayout
android:id="@+id/ll_home"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" > <ImageView
android:id="@+id/iv_home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab_home_pressed" /> <TextView
android:id="@+id/tv_home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:text="首页"
android:textColor="#1B940A"
android:textStyle="bold" />
</LinearLayout> <LinearLayout
android:id="@+id/ll_find"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" > <ImageView
android:id="@+id/iv_find"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab_find_normal" /> <TextView
android:id="@+id/tv_find"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:text="发现"
android:textColor="#ffffff"
android:textStyle="bold" />
</LinearLayout> <LinearLayout
android:id="@+id/ll_recommend"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" > <ImageView
android:id="@+id/iv_recommend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab_recommend_normal" /> <TextView
android:id="@+id/tv_recommend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:text="推荐"
android:textColor="#ffffff"
android:textStyle="bold" />
</LinearLayout> <LinearLayout
android:id="@+id/ll_discuss"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" > <ImageView
android:id="@+id/iv_discuss"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/tab_discuss_normal" /> <TextView
android:id="@+id/tv_discuss"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:text="讨论"
android:textColor="#ffffff"
android:textStyle="bold" />
</LinearLayout> </LinearLayout>
home.xml（四个Fragment页面的主页面布局，其他类似）
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"> <ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"> </LinearLayout>
</ScrollView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="我是首页"
android:textSize="30dp" /> </RelativeLayout>
HomeFragment(Fragment的java文件，可实现对应页面的功能，此处只列出一个)
package com.example.liu.cakeapp; import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup; /**
* Created by lenovo on 2016/9/8.
*/
public class HomeFragment extends Fragment {
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle saveInstanceState){
return inflater.inflate(R.layout.home,container,false);
}
}
MainActivity
package com.example.liu.cakeapp; import android.app.SearchManager;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.SearchView;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView; public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener , View.OnClickListener { //底部菜单四个LinearLayout
private LinearLayout ll_home;
private LinearLayout ll_find;
private LinearLayout ll_recommend;
private LinearLayout ll_discuss; //底部菜单四个ImageView
private ImageView iv_home;
private ImageView iv_find;
private ImageView iv_recommend;
private ImageView iv_discuss; //底部菜单四个菜单标题
private TextView tv_home;
private TextView tv_find;
private TextView tv_recommend;
private TextView tv_discuss; //四个Fragment
private Fragment homeFragment;
private Fragment findFragment;
private Fragment recommendFragment;
private Fragment discussFragment; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar); //初始化控件
initView();
// 初始化底部按钮事件
initEvent();
// 初始化并设置当前Fragment
initFragment(0); FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
}); DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState(); NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
} @Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu); SearchManager searchManager=(SearchManager)getSystemService(Context.SEARCH_SERVICE);
SearchView searchView=(SearchView)menu.findItem(R.id.toolbar_search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); return true;
} @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId(); //noinspection SimplifiableIfStatement
if (id == R.id.event) {
return true;
}else if(id == R.id.jump)
{
return true;
}else if(id == R.id.event)
{
return true;
}else if(id == R.id.event)
{
return true;
} return super.onOptionsItemSelected(item);
} @SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId(); if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) { } else if (id == R.id.nav_slideshow) { } else if (id == R.id.nav_manage) { } else if (id == R.id.nav_share) { } else if (id == R.id.nav_send) { } DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
} private void initFragment(int index){
FragmentManager fragmentManager=getSupportFragmentManager();
FragmentTransaction transaction=fragmentManager.beginTransaction();
//隐藏所有Fragment
hideFragment(transaction);
switch(index){
case 0:
if(homeFragment == null){
homeFragment=new HomeFragment();
transaction.add(R.id.fl_content, homeFragment);
}else{
transaction.show(homeFragment);
}
break;
case 1:
if(findFragment == null){
findFragment=new FindFragment();
transaction.add(R.id.fl_content, findFragment);
}else{
transaction.show(findFragment);
}
break;
case 2:
if(recommendFragment == null){
recommendFragment=new RecommendFragment();
transaction.add(R.id.fl_content, recommendFragment);
}else{
transaction.show(recommendFragment);
}
break;
case 3:
if(discussFragment == null){
discussFragment=new DiscussFragment();
transaction.add(R.id.fl_content, discussFragment);
}else{
transaction.show(discussFragment);
}
break;
default:
break;
}
transaction.commit();
}
//隐藏Fragment
private void hideFragment(FragmentTransaction transaction) {
if (homeFragment != null) {
transaction.hide(homeFragment);
}
if (findFragment != null) {
transaction.hide(findFragment);
}
if (recommendFragment != null) {
transaction.hide(recommendFragment);
}
if (discussFragment != null) {
transaction.hide(discussFragment);
}
}
private void initEvent(){
ll_home.setOnClickListener(this);
ll_find.setOnClickListener(this);
ll_recommend.setOnClickListener(this);
ll_discuss.setOnClickListener(this);
} private void initView(){
this.ll_home=(LinearLayout)findViewById(R.id.ll_home);
this.ll_find=(LinearLayout)findViewById(R.id.ll_find);
this.ll_recommend=(LinearLayout)findViewById(R.id.ll_recommend);
this.ll_discuss=(LinearLayout)findViewById(R.id.ll_discuss); this.iv_home=(ImageView)findViewById(R.id.iv_home);
this.iv_find=(ImageView)findViewById(R.id.iv_find);
this.iv_recommend=(ImageView)findViewById(R.id.iv_recommend);
this.iv_discuss=(ImageView)findViewById(R.id.iv_discuss); this.tv_home=(TextView)findViewById(R.id.tv_home);
this.tv_find=(TextView)findViewById(R.id.tv_find);
this.tv_recommend=(TextView)findViewById(R.id.tv_recommend);
this.tv_discuss=(TextView)findViewById(R.id.tv_discuss);
} public void onClick(View v){
//在每次点击后将所有的底部按钮颜色改变为灰色，然后根据点击着色
restartBotton();
//ImageView和TetxView设置为绿色，页面随之跳转
switch (v.getId()){
case R.id.ll_home:
iv_home.setImageResource(R.drawable.tab_home_pressed);
tv_home.setTextColor(0xff1B940A);
initFragment(0);
break;
case R.id.ll_find:
iv_find.setImageResource(R.drawable.tab_find_pressed);
tv_find.setTextColor(0xff1B940A);
initFragment(1);
break;
case R.id.ll_recommend:
iv_recommend.setImageResource(R.drawable.tab_recommend_pressed);
tv_recommend.setTextColor(0xff1B940A);
initFragment(2);
break;
case R.id.ll_discuss:
iv_discuss.setImageResource(R.drawable.tab_discuss_pressed);
tv_discuss.setTextColor(0xff1B940A);
initFragment(3);
break;
default:
break;
}
}
public void restartBotton(){
iv_home.setImageResource(R.drawable.tab_home_normal);
iv_find.setImageResource(R.drawable.tab_find_normal);
iv_recommend.setImageResource(R.drawable.tab_recommend_normal);
iv_discuss.setImageResource(R.drawable.tab_discuss_normal); tv_home.setTextColor(0xffffffff);
tv_find.setTextColor(0xffffffff);
tv_recommend.setTextColor(0xffffffff);
tv_discuss.setTextColor(0xffffffff);
}
}
总结：
参考仿微信底部菜单栏实现底部菜单栏页面的切换，文件的布局相当清晰，对于功能的实现相对简单。
优点：
1、Fragment文件单独存在，各自页面的内容各自去实现完成，有自己的生命周期，便于后期维护。
2、对于需要手势操作的一些内容不会起冲突。
缺点：
1、界面不可滑动，比较死板。