Android中实现底部导航栏的功能

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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;    }}



                                             
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