Android底部导航栏实现（三）之TextView+LinearLayout

这里简单记录下通过TextView+LinearLayout+Fragment来实现Android底部导航栏。

布局

<!--fragment_text_tab.xml--> 
 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
              android:layout_width="match_parent" 
              android:layout_height="match_parent" 
              android:orientation="vertical"> 
 
    <FrameLayout 
        android:id="@+id/sub_content" 
        android:layout_width="match_parent" 
        android:layout_height="0dp" 
        android:layout_weight="1"> 
 
        <TextView 
            android:id="@+id/activity_text_view" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:layout_centerHorizontal="true" 
            android:text="@string/tips" 
            android:textColor="@color/colorPrimary" 
            android:textSize="18sp" 
            android:textStyle="bold|italic"/> 
    </FrameLayout> 
 
    <View 
        android:layout_width="match_parent" 
        android:layout_height="1px" 
        android:background="@color/grey_300"/> 
 
    <include layout="@layout/tab_layout_for_bottom"/> 
 
</LinearLayout> 
 
 
 
<!--tab_layout_for_bottom--> 
 
<?xml version="1.0" encoding="utf-8"?> 
 
 
<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="56dp" 
    android:background="@color/white" 
    android:orientation="horizontal" 
    tools:showIn="@layout/fragment_text_tab"> 
 
    <TextView 
        android:id="@+id/tv_home" 
        style="@style/viewpager_navigation_bar_tab_style" 
        android:drawableTop="@drawable/home" 
        android:text="@string/item_home"/> 
 
    <TextView 
        android:id="@+id/tv_location" 
        style="@style/viewpager_navigation_bar_tab_style" 
        android:drawableTop="@drawable/location" 
        android:text="@string/item_location"/> 
 
    <TextView 
        android:id="@+id/tv_like" 
        style="@style/viewpager_navigation_bar_tab_style" 
        android:drawableTop="@drawable/like" 
        android:text="@string/item_like"/> 
 
    <TextView 
        android:id="@+id/tv_person" 
        style="@style/viewpager_navigation_bar_tab_style" 
        android:drawableTop="@drawable/person" 
        android:text="@string/item_person"/> 
</LinearLayout> 

代码

mTHome.setOnClickListener(this); 
    mTLocation.setOnClickListener(this); 
    mTLike.setOnClickListener(this); 
    mTMe.setOnClickListener(this); 
    setDefaultFragment();//设置默认显示Fragment 
         
    @Override 
    public void onClick(View view) { 
        resetTabState();//reset the tab state 
        switch (view.getId()) { 
            case R.id.tv_home: 
                setTabState(mTHome, R.drawable.home_fill, getColor(R.color.colorPrimary));//设置Tab状态 
                switchFrgment(0);//切换Fragment 
                break; 
            case R.id.tv_location: 
                setTabState(mTLocation, R.drawable.location_fill, getColor(R.color.colorPrimary)); 
                switchFrgment(1); 
                break; 
            case R.id.tv_like: 
                setTabState(mTLike, R.drawable.like_fill, getColor(R.color.colorPrimary)); 
                switchFrgment(2); 
                break; 
            case R.id.tv_person: 
                setTabState(mTMe, R.drawable.person_fill, getColor(R.color.colorPrimary)); 
                switchFrgment(3); 
                break; 
        } 
    }  

Fragment的切换

/** 
     * switch the fragment accordting to id 
     * @param i id 
     */ 
    private void switchFrgment(int i) { 
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction(); 
        switch (i) { 
            case 0: 
                if (mHomeFragment == null) { 
                    mHomeFragment = mHomeFragment.newInstance(getString(R.string.item_home)); 
                } 
                transaction.replace(R.id.sub_content, mHomeFragment); 
                break; 
            case 1: 
                if (mLocationFragment == null) { 
                    mLocationFragment = LocationFragment.newInstance(getString(R.string.item_location)); 
                } 
                transaction.replace(R.id.sub_content, mLocationFragment); 
                break; 
            case 2: 
                if (mLikeFragment == null) { 
                    mLikeFragment = LikeFragment.newInstance(getString(R.string.item_like)); 
                } 
                transaction.replace(R.id.sub_content, mLikeFragment); 
                break; 
            case 3: 
                if (mPersonFragment == null) { 
                    mPersonFragment = PersonFragment.newInstance(getString(R.string.item_person)); 
                } 
                transaction.replace(R.id.sub_content, mPersonFragment); 
                break; 
        } 
        transaction.commit(); 
    }  

这里面值得注意的地方就是要用getChildFragmentManager()，否则会出现切换Fragment内容不显示的情况。

设置Tab状态

/** 
     * set the tab state of bottom navigation bar 
     * 
     * @param textView the text to be shown 
     * @param image    the image 
     * @param color    the text color 
     */ 
    private void setTabState(TextView textView, int image, int color) { 
        textView.setCompoundDrawablesRelativeWithIntrinsicBounds(0, image, 0, 0);//Call requires API level 17 
        textView.setTextColor(color); 
    } 
 
 
 
    /** 
     * revert the image color and text color to black 
     */ 
    private void resetTabState() { 
        setTabState(mTHome, R.drawable.home, getColor(R.color.black_1)); 
        setTabState(mTLocation, R.drawable.location, getColor(R.color.black_1)); 
        setTabState(mTLike, R.drawable.like, getColor(R.color.black_1)); 
        setTabState(mTMe, R.drawable.person, getColor(R.color.black_1)); 
 
    }  

说明：这几篇文章没有过多的文字叙述，因为这些东西也不是很难，而且都是常用的，相信很多人都了如指掌了，多说亦是废话，直接上代码看的反而更清楚。