Android中实现底部导航栏的功能

实验效果：

（1）在drawable文件夹下新建tab_menu_bg.xml文件，具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true">
        <shape>
            <solid android:color="@color/bg_gray"/>
        </shape>
    </item>
</selector>

（2）在drawable文件夹下新建tab_menu_text.xml文件，具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/text_green" android:state_selected="true"/>
    <item android:color="@color/text_black" />
</selector>

（3）在drawable文件夹下新建tab_menu_personal.xml文件，具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/menu_personal_on" android:state_selected="true"/>
    <item android:drawable="@mipmap/menu_personal_off"/>
</selector>

（4）在drawable文件夹下新建tab_menu_send.xml文件，具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/menu_send_on" android:state_selected="true"/>
    <item android:drawable="@mipmap/menu_send_off"/>
</selector>

（5）在drawable文件夹下新建tab_menu_list.xml文件，具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/menu_send_on" android:state_selected="true"/>
    <item android:drawable="@mipmap/menu_send_off"/>
</selector>

（6）在layout文件夹下的activity_main.xml中具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bzu.fshiner.parttimejob.MainActivity">
    <RelativeLayout
        android:id="@+id/tab_title"
        android:layout_width="match_parent"
        android:layout_height="48dp">
        <TextView
            android:id="@+id/tv_top"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:textSize="18sp"
            android:textColor="@color/text_black"
            android:text="@string/tv_top"/>
        <View
            android:layout_width="match_parent"
            android:layout_height="2px"
            android:background="@color/text_black"
            android:layout_alignParentBottom="true"/>
    </RelativeLayout>
    <LinearLayout
        android:id="@+id/tab_menu"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true">
        <TextView
            android:id="@+id/tv_list"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:drawablePadding="3dp"
            android:gravity="center"
            android:background="@drawable/tab_menu_bg"
            android:textColor="@drawable/tab_menu_text"
            android:drawableTop="@drawable/tab_menu_list"
            android:text="@string/tv_list"/> 
        <TextView 
            android:id="@+id/tv_send" 
            android:layout_width="0dp" 
            android:layout_height="match_parent" 
            android:layout_weight="1" 
            android:drawablePadding="3dp" 
            android:gravity="center" 
            android:background="@drawable/tab_menu_bg" 
            android:textColor="@drawable/tab_menu_text"
            android:drawableTop="@drawable/tab_menu_send"
            android:text="@string/tv_send"/> 
        <TextView android:id="@+id/tv_personal" 
            android:layout_width="0dp" 
            android:layout_height="match_parent" 
            android:layout_weight="1" 
            android:drawablePadding="3dp" 
            android:gravity="center" 
            android:background="@drawable/tab_menu_bg" 
            android:textColor="@drawable/tab_menu_text" 
            android:drawableTop="@drawable/tab_menu_personal" 
            android:text="@string/tv_personal"/> 
     </LinearLayout> 
     <View 
          android:id="@+id/div_tab_bar"
          android:layout_width="match_parent"
          android:layout_height="2px" 
          android:layout_above="@id/tab_menu"/> 
     <FrameLayout 
          android:id="@+id/fragment_container" 
          android:layout_width="match_parent" 
          android:layout_height="match_parent" 
          android:layout_below="@id/tab_title" 
          android:layout_above="@id/tab_menu"> 
     </FrameLayout>
</RelativeLayout>

（7）在layout文件夹中新建first_fragment.xml文件，具体代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/tv_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="哈哈"
        android:textSize="20sp"/>

</LinearLayout>

（8）在MainActivity中具体代码如下：

package com.bzu.fshiner.parttimejob;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private TextView tv_top;
    private TextView tv_list;
    private TextView tv_send;
    private TextView tv_personal;
    private FrameLayout fragment_container;
    private FirstFragment f1,f2,f3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //ui组件初始化与事件绑定
        tv_top=(TextView)this.findViewById(R.id.tv_top);
        tv_list=(TextView)this.findViewById(R.id.tv_list);
        tv_send=(TextView)this.findViewById(R.id.tv_send);
        tv_personal=(TextView)this.findViewById(R.id.tv_personal);
        fragment_container=(FrameLayout)findViewById(R.id.fragment_container);
        tv_list.setOnClickListener(this);
        tv_send.setOnClickListener(this);
        tv_personal.setOnClickListener(this);
    }
    //重置所有文本的选中状态
    public void selected(){
        tv_list.setSelected(false);
        tv_send.setSelected(false);
        tv_personal.setSelected(false);
    }

    //隐藏所有的Fragment
    private void hideAllFragment(android.app.FragmentTransaction transaction) {
        if(f1!=null){
            transaction.hide(f1);
        }
        if(f2!=null){
            transaction.hide(f2);
        }
        if(f3!=null){
            transaction.hide(f3);
        }
    }
    @Override
    public void onClick(View view){
       android.app.FragmentTransaction transaction=getFragmentManager().beginTransaction();
        hideAllFragment(transaction);
        switch(view.getId()){
            case R.id.tv_list:
                selected();
                tv_list.setSelected(true);
                if(f1==null){
                    f1 = new FirstFragment("第一个Fragment");
                    transaction.add(R.id.fragment_container,f1);
                }else{
                    transaction.show(f1);
                }
                break;

            case R.id.tv_send:
                selected();
                tv_send.setSelected(true);
                if(f2==null){
                    f2 = new FirstFragment("第2个Fragment");
                    transaction.add(R.id.fragment_container,f2);
                }else{
                    transaction.show(f2);
                }
                break;

            case R.id.tv_personal:
                selected();
                tv_personal.setSelected(true);
                if(f3==null){
                    f3 = new FirstFragment("第三个Fragment");
                    transaction.add(R.id.fragment_container,f3);
                }else{
                    transaction.show(f3);
                }
                break;
        }
        transaction.commit();
    }

}

（9）创建类，类名为FistFragment，其中具体代码如下：

package com.bzu.fshiner.parttimejob;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by Administrator on 2017/5/9.
 */

public class FirstFragment extends Fragment {
    private String context;
    private TextView textView;

    public FirstFragment(String context) {
        this.context = context;
    }
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
        View view=inflater.inflate(R.layout.first_fragment,container,false);
        textView=(TextView)view.findViewById(R.id.tv_content);
        textView.setText(context);
        return view;
    }
}

Android中实现底部导航栏的功能

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