转载自：https://blog.csdn.net/jxq1994/article/details/52573506
现在大多数App都会用到底部导航栏，比如常见的聊天工具QQ、微信，购物App等等，有了底部导航栏，用户可以随时切换界面，查看不同的内容。它的实现方式也很多，以前大多使用TabHost来实现，但是现在我们有很多更好的选择。
使用LinearLayout + TextView实现了底部导航栏的效果
首先看看工程目录：
Step 1：实现底部选项的一些资源文件
图片Drawable资源：tab_menu_deal.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@mipmap/ic_menu_deal_on" android:state_selected="true"/>
<item android:drawable="@mipmap/ic_menu_deal_off"/>
</selector>- 1
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不用做过多解释了吧，点击图片，变换图片。
其他三个依葫芦画瓢。
文字资源：tab_menu_deal_text.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/text_blue" android:state_selected="true"/>
<item android:color="@color/text_gray" />
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背景资源 tab_menu_bg.xml：
<?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="#FFC4C4C4"/>
</shape>
</item>
<item>
<shape>
<solid android:color="@color/transparent" />
</shape>
</item>
</selector>- 1
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Step 2：编写我们的Activity布局
activity_main.xml:
<?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:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/tab_title"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@color/transparent">
<TextView
android:id="@+id/txt_top"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="18sp"
android:textColor="@color/text_gray"
android:text= "@string/infomation" />
<View
android:layout_width="match_parent"
android:layout_height="2px"
android:background="@color/text_gray"
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/txt_deal"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/tab_menu_bg"
android:drawablePadding="3dp"
android:drawableTop="@drawable/tab_menu_deal"
android:gravity="center"
android:textColor="@drawable/tab_menu_deal_text"
android:text="点餐"/>
<TextView
android:id="@+id/txt_poi"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/tab_menu_bg"
android:drawablePadding="3dp"
android:drawableTop="@drawable/tab_menu_poi"
android:gravity="center"
android:textColor="@drawable/tab_menu_poi_text"
android:text="商铺"/>
<TextView
android:id="@+id/txt_user"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/tab_menu_bg"
android:drawablePadding="3dp"
android:drawableTop="@drawable/tab_menu_user"
android:gravity="center"
android:textColor="@drawable/tab_menu_user_text"
android:text="用户"/>
<TextView
android:id="@+id/txt_more"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/tab_menu_bg"
android:drawablePadding="3dp"
android:drawableTop="@drawable/tab_menu_more"
android:gravity="center"
android:textColor="@drawable/tab_menu_more_text"
android:text="更多"/>
</LinearLayout>
<View
android:id="@+id/div_tab_bar"
android:layout_width="match_parent"
android:layout_height="2px"
android:background="@color/text_gray"
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"
android:background="@color/transparent">
</FrameLayout>
</RelativeLayout>
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效果图如下：
Step 3：创建一个Fragment的简单布局与类：
first_fragment.xml：
<?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"
android:background="@color/transparent">
<TextView
android:id="@+id/txt_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="呵呵"
android:textColor="@color/text_blue"
android:textSize="20sp"/>
</LinearLayout>- 1
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FirstFragment.java:
public class FirstFragment extends Fragment {
private String context;
private TextView mTextView;
public FirstFragment(String context){
this.context = context;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.first_fragment,container,false);
mTextView = (TextView)view.findViewById(R.id.txt_content);
//mTextView = (TextView)getActivity().findViewById(R.id.txt_content);
mTextView.setText(context);
return view;
}
}
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Step 4：编写MainActivity.java
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private TextView topBar;
private TextView tabDeal;
private TextView tabPoi;
private TextView tabMore;
private TextView tabUser;
private FrameLayout ly_content;
private FirstFragment f1,f2,f3,f4;
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
bindView();
}
//UI组件初始化与事件绑定
private void bindView() {
topBar = (TextView)this.findViewById(R.id.txt_top);
tabDeal = (TextView)this.findViewById(R.id.txt_deal);
tabPoi = (TextView)this.findViewById(R.id.txt_poi);
tabUser = (TextView)this.findViewById(R.id.txt_user);
tabMore = (TextView)this.findViewById(R.id.txt_more);
ly_content = (FrameLayout) findViewById(R.id.fragment_container);
tabDeal.setOnClickListener(this);
tabMore.setOnClickListener(this);
tabUser.setOnClickListener(this);
tabPoi.setOnClickListener(this);
}
//重置所有文本的选中状态
public void selected(){
tabDeal.setSelected(false);
tabMore.setSelected(false);
tabPoi.setSelected(false);
tabUser.setSelected(false);
}
//隐藏所有Fragment
public void hideAllFragment(FragmentTransaction transaction){
if(f1!=null){
transaction.hide(f1);
}
if(f2!=null){
transaction.hide(f2);
}
if(f3!=null){
transaction.hide(f3);
}
if(f4!=null){
transaction.hide(f4);
}
}
@Override
public void onClick(View v) {
FragmentTransaction transaction = getFragmentManager().beginTransaction();
hideAllFragment(transaction);
switch(v.getId()){
case R.id.txt_deal:
selected();
tabDeal.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.txt_more:
selected();
tabMore.setSelected(true);
if(f2==null){
f2 = new FirstFragment("第二个Fragment");
transaction.add(R.id.fragment_container,f2);
}else{
transaction.show(f2);
}
break;
case R.id.txt_poi:
selected();
tabPoi.setSelected(true);
if(f3==null){
f3 = new FirstFragment("第三个Fragment");
transaction.add(R.id.fragment_container,f3);
}else{
transaction.show(f3);
}
break;
case R.id.txt_user:
selected();
tabUser.setSelected(true);
if(f4==null){
f4 = new FirstFragment("第四个Fragment");
transaction.add(R.id.fragment_container,f4);
}else{
transaction.show(f4);
}
break;
}
transaction.commit();
}
}
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实现效果图如下：
使用RadioGroup + RadioButton实现了底部导航栏的效果
这一次的资源文件和上一次是一样的，只需要把外drawable类的资源的selected 状态修改成checked状态：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@mipmap/ic_menu_deal_on" android:state_checked="true"/>
<item android:drawable="@mipmap/ic_menu_deal_off"/>
</selector>- 1
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其他文字资源及背景资源不变
这里我们首先从主布局文件开始：
Step 2：编写我们的Activity布局
由于布局中的RadioButton的属性大部分是一样的，因此我们可以将这一部分一样的代码抽取出来，写到style.xml文件中：
style.xml:
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="tab_menu_item">
<item name="android:layout_width">0dp</item>
<item name="android:layout_weight">1</item>
<item name="android:layout_height">match_parent</item>
<item name="android:background">@drawable/tab_menu_bg</item>
<item name="android:button">@null</item>
<item name="android:gravity">center</item>
<item name="android:paddingTop">3dp</item>
<item name="android:textColor">@drawable/tab_menu_text</item>
<item name="android:textSize">18sp</item>
</style>
</resources>
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然后我们的activity_main.xml中的RadioButton就用不着次次都写相同的代码了， 只需让RadioButton的style=”@style/tab_menu_item”就可以了！
activity_main.xml :
<?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:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/ly_top_bar"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@color/transparent">
<TextView
android:id="@+id/txt_topbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:text="信息"
android:textColor="@color/text_gray"
android:textSize="18sp" />
<View
android:layout_width="match_parent"
android:layout_height="2px"
android:layout_alignParentBottom="true"
android:background="@color/text_gray" />
</RelativeLayout>
<RadioGroup
android:id="@+id/rd_group"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:background="@color/transparent"
android:orientation="horizontal">
<RadioButton
android:id="@+id/rd_menu_deal"
style="@style/tab_menu_item"
android:drawableTop="@drawable/tab_menu_deal"
android:text="点餐"/>
<RadioButton
android:id="@+id/rd_menu_poi"
style="@style/tab_menu_item"
android:drawableTop="@drawable/tab_menu_poi"
android:text="商铺"/>
<RadioButton
android:id="@+id/rd_menu_more"
style="@style/tab_menu_item"
android:drawableTop="@drawable/tab_menu_more"
android:text="更多"/>
<RadioButton
android:id="@+id/rd_menu_user"
style="@style/tab_menu_item"
android:drawableTop="@drawable/tab_menu_user"
android:text="用户"/>
</RadioGroup>
<FrameLayout
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/rd_group"
android:layout_below="@id/ly_top_bar"
android:background="@color/transparent">
</FrameLayout>
</RelativeLayout>
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效果图如下：
Step 3：创建一个Fragment的简单布局与类：
my_fragment.xml :
<?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/textView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:textColor="@color/text_blue"
android:gravity="center"
android:text="呵呵"/>
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MyFragment.java :
public class MyFragment extends Fragment{
private String context;
private TextView mTextView;
public MyFragment(String context){
this.context = context;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.my_fragment,container,false);
mTextView = (TextView)view.findViewById(R.id.textView);
mTextView.setText(context);
return view;
}
}
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Step 4：编写MainActivity.java
public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener{
private RadioGroup rpTab;
private RadioButton rbDeal,rbPoi,rbMore,rbUser;
private MyFragment fg1,fg2,fg3,fg4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindView();
}
private void bindView() {
rpTab = (RadioGroup)findViewById(R.id.rd_group);
rpTab.setOnCheckedChangeListener(this);
rbDeal = (RadioButton)findViewById(R.id.rd_menu_deal);
rbPoi = (RadioButton)findViewById(R.id.rd_menu_poi);
rbMore = (RadioButton)findViewById(R.id.rd_menu_more);
rbUser = (RadioButton)findViewById(R.id.rd_menu_user);
rbDeal.setChecked(true);
}
public void hideAllFragment(FragmentTransaction transaction){
if(fg1!=null){
transaction.hide(fg1);
}
if(fg2!=null){
transaction.hide(fg2);
}
if(fg3!=null){
transaction.hide(fg3);
}
if(fg4!=null){
transaction.hide(fg4);
}
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
FragmentTransaction transaction = getFragmentManager().beginTransaction();
hideAllFragment(transaction);
switch (checkedId){
case R.id.rd_menu_deal:
if(fg1==null){
fg1 = new MyFragment("第一个Fragment");
transaction.add(R.id.fragment_container,fg1);
}else{
transaction.show(fg1);
}
break;
case R.id.rd_menu_poi:
if(fg2==null){
fg2 = new MyFragment("第二个Fragment");
transaction.add(R.id.fragment_container,fg2);
}else{
transaction.show(fg2);
}
break;
case R.id.rd_menu_more:
if(fg3==null){
fg3 = new MyFragment("第三个Fragment");
transaction.add(R.id.fragment_container,fg3);
}else{
transaction.show(fg3);
}
break;
case R.id.rd_menu_user:
if(fg4==null){
fg4 = new MyFragment("第四个Fragment");
transaction.add(R.id.fragment_container,fg4);
}else{
transaction.show(fg4);
}
break;
}
transaction.commit();
}
}
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效果图和上面一样：
实现类似新浪微博的底部导航栏
前面我们已经跟大家讲解了实现底部导航栏的两种方案，但是这两种方案只适合普通的情况，如果 是像新浪微博那样的，想在底部导航栏上的item带有一个红色的小点，然后加上一个消息数目这样， 前面两种方案就显得无力了，我们来看看别人的APP是怎么做的，打开手机的开发者选项，勾选里面的： 显示布局边界，然后打开我们参考的那个App，可以看到底部导航栏是这样的：
上面这个图我们就可以看出，这种底部导航栏不是简单的TextView或者RadioGroup构成的， 大概布局方案可能是：外层一个LinearLayout，中间一个RelativeLayout，而在中间有一个TextView， 然后再在TextView的右上角有一个红色圆圈背景的TextView或者一个红色的小点； 大概就这样，而这些小点平时的时候应该设置的不可见，当收到信息推送，即有相关类别信息的 时候再可见，并且显示对应的信息数目！那么下面我们就来实现下这种底部导航栏的效果，！
实现效果：
为了方便理解，这里通过点击按钮的形式，模拟收到推送信息，然后显示红色点！
Step 1：相关资源文件的准备：
和前面一样，准备好drawable系列的资源：
文字资源：tab_menu_text.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/text_blue" android:state_selected="true"/>
<item android:color="@color/text_gray" />
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图标资源：tab_menu_better.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@mipmap/ic_menu_deal_on" android:state_selected="true"/>
<item android:drawable="@mipmap/ic_menu_deal_off"/>
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其他三个依葫芦画瓢！
Step 2：编写activity的布局代码：
因为四个选项的TextView以及右上角的红点数字属性都差不多，如下：
<TextView
android:id="@+id/tab_menu_channel"
android:layout_marginTop="5dp"
android:layout_width="wrap_content"
android:layout_height="48dp"
android:layout_centerInParent="true"
android:textColor="@drawable/tab_menu_text"
android:drawableTop="@drawable/tab_menu_channel"
android:text="@string/tab_menu_alert"/>
<TextView
android:layout_width="20dp"
android:layout_height="20dp"
android:background="@mipmap/bg_num"
android:layout_toRightOf="@+id/tab_menu_channel"
android:layout_marginLeft="-10dp"
android:text="99+"
android:textSize="12sp"
android:gravity="center"
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我们将他们抽取出来，写到style.xml里：
<style name="tab_menu_text">
<item name="android:layout_marginTop">5dp</item>
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">48dp</item>
<item name="android:layout_centerInParent">true</item>
<item name="android:textColor">@drawable/tab_menu_text</item>
</style>
<style name="tab_menu_bgnum">
<item name="android:layout_width">20dp</item>
<item name="android:layout_height">20dp</item>
<item name="android:background">@mipmap/bg_num</item>
<item name="android:layout_marginLeft">-10dp</item>
<item name="android:textSize">12sp</item>
<item name="android:gravity">center</item>
<item name="android:textColor">@color/text_white</item>
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然后开始编写我们的activity.xml布局：
<?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:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/ly_top_bar"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@color/transparent">
<TextView
android:id="@+id/txt_topbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:text="信息"
android:textColor="@color/text_gray"
android:textSize="18sp" />
<View
android:layout_width="match_parent"
android:layout_height="2px"
android:layout_alignParentBottom="true"
android:background="@color/text_gray" />
</RelativeLayout>
<LinearLayout
android:id="@+id/ly_tab_menu"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:background="@color/transparent"
android:orientation="horizontal">
<LinearLayout
android:id="@+id/ly_tab_menu_deal"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="5dp">
<TextView
android:id="@+id/tab_menu_deal"
style="@style/tab_menu_text"
android:drawableTop="@drawable/tab_menu_deal"
android:text="点餐" />
<TextView
android:id="@+id/tab_menu_deal_num"
style="@style/tab_menu_bgnum"
android:layout_toRightOf="@+id/tab_menu_deal"
android:text="99+"
android:visibility="gone" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/ly_tab_menu_poi"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="5dp">
<TextView
android:id="@+id/tab_menu_poi"
style="@style/tab_menu_text"
android:drawableTop="@drawable/tab_menu_poi"
android:text="商铺" />
<TextView
android:id="@+id/tab_menu_poi_num"
style="@style/tab_menu_bgnum"
android:layout_toRightOf="@+id/tab_menu_poi"
android:text="99+"
android:visibility="gone" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/ly_tab_menu_more"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="5dp">
<TextView
android:id="@+id/tab_menu_more"
style="@style/tab_menu_text"
android:drawableTop="@drawable/tab_menu_more"
android:text="更多" />
<TextView
android:id="@+id/tab_menu_more_num"
style="@style/tab_menu_bgnum"
android:layout_toRightOf="@+id/tab_menu_more"
android:text="99+"
android:visibility="gone" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/ly_tab_menu_user"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="5dp">
<TextView
android:id="@+id/tab_menu_user"
style="@style/tab_menu_text"
android:drawableTop="@drawable/tab_menu_user"
android:text="用户" />
<ImageView
android:id="@+id/tab_menu_setting_partner"
android:layout_width="12dp"
android:layout_height="12dp"
android:layout_marginLeft="-5dp"
android:layout_toRightOf="@id/tab_menu_user"
android:visibility="gone"
android:src="@mipmap/partner_red" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>
<View
android:id="@+id/div_tab_bar"
android:layout_width="match_parent"
android:layout_height="2px"
android:layout_above="@id/ly_tab_menu"
android:background="@color/text_gray" />
<FrameLayout
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/transparent"
android:layout_above="@id/div_tab_bar"
android:layout_below="@id/ly_top_bar"/>
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效果图如下：
Step 3：编写Fragment界面布局以及类
Fragment布局由四个普通按钮构成：
fragment_my.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="5dp">
<Button
android:id="@+id/btn_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="显示第一个消息"/>
<Button
android:id="@+id/btn_two"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="第二个显示信息"/>
<Button
android:id="@+id/btn_three"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="第三个显示信息"/>
<Button
android:id="@+id/btn_four"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="第四个显示信息"/>
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接着是自定义的Fragment类，这里的话我们通过getActivity.findViewById()来获得Activity 中的小红点，这里仅仅是简单的控制显示而已！
MyFragment.java:
public class MyFragment extends Fragment implements View.OnClickListener{
private Context mContext;
private Button btn_one;
private Button btn_two;
private Button btn_three;
private Button btn_four;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frament_my,container,false);
btn_one = (Button)view.findViewById(R.id.btn_one);
btn_two = (Button)view.findViewById(R.id.btn_two);
btn_three = (Button)view.findViewById(R.id.btn_three);
btn_four = (Button)view.findViewById(R.id.btn_four);
btn_one.setOnClickListener(this);
btn_two.setOnClickListener(this);
btn_three.setOnClickListener(this);
btn_four.setOnClickListener(this);
return view;
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btn_one:
TextView mTextViewDeal = (TextView)getActivity().findViewById(R.id.tab_menu_deal_num);
mTextViewDeal.setText("11");
mTextViewDeal.setVisibility(View.VISIBLE);
break;
case R.id.btn_two:
TextView mTextViewPoi = (TextView)getActivity().findViewById(R.id.tab_menu_poi_num);
mTextViewPoi.setText("99");
mTextViewPoi.setVisibility(View.VISIBLE);
break;
case R.id.btn_three:
TextView mTextViewMore = (TextView)getActivity().findViewById(R.id.tab_menu_more_num);
mTextViewMore.setText("999+");
mTextViewMore.setVisibility(View.VISIBLE);
break;
case R.id.btn_four:
ImageView mImageView = (ImageView) getActivity ().findViewById(R.id.tab_menu_setting_partner);
mImageView.setVisibility(View.VISIBLE);
break;
}
}
}
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Step 4：编写MainActivity
我们在这里完成主要的逻辑实现，有些部分和前面TextView实现底部导航栏的效果类似， 就不具体讲解了，代码如下：
MainActivity.java：
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private LinearLayout ly_one,ly_two,ly_three,ly_four;
private TextView mTextView1,mTextView2,mTextView3,mTextView4;
private TextView mTextNum1,mTextNum2,mTextNum3,mTxetNum3;
private ImageView mImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindView();
ly_one.performClick();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
MyFragment fg1 = new MyFragment();
transaction.add(R.id.fragment_container,fg1);
transaction.commit();
}
private void bindView() {
ly_one = (LinearLayout)findViewById(R.id.ly_tab_menu_deal);
ly_two = (LinearLayout)findViewById(R.id.ly_tab_menu_poi);
ly_three = (LinearLayout)findViewById(R.id.ly_tab_menu_more);
ly_four = (LinearLayout)findViewById(R.id.ly_tab_menu_user);
mTextView1 = (TextView)findViewById(R.id.tab_menu_deal);
mTextView2 = (TextView)findViewById(R.id.tab_menu_poi);
mTextView3 = (TextView)findViewById(R.id.tab_menu_more);
mTextView4 = (TextView)findViewById(R.id.tab_menu_user);
mTextNum1 = (TextView)findViewById(R.id.tab_menu_deal_num);
mTextNum2 = (TextView)findViewById(R.id.tab_menu_poi_num);
mTextNum3 = (TextView)findViewById(R.id.tab_menu_more_num);
mImageView = (ImageView)findViewById(R.id.tab_menu_setting_partner);
ly_one.setOnClickListener(this);
ly_two.setOnClickListener(this);
ly_three.setOnClickListener(this);
ly_four.setOnClickListener(this);
}
//重置所有文本的选中状态
private void setSelected() {
mTextView1.setSelected(false);
mTextView2.setSelected(false);
mTextView3.setSelected(false);
mTextView4.setSelected(false);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.ly_tab_menu_deal:
setSelected();
mTextView1.setSelected(true);
mTextNum1.setVisibility(View.INVISIBLE);
break;
case R.id.ly_tab_menu_poi:
setSelected();
mTextView2.setSelected(true);
mTextNum2.setVisibility(View.INVISIBLE);
break;
case R.id.ly_tab_menu_more:
setSelected();
mTextView3.setSelected(true);
mTextNum3.setVisibility(View.INVISIBLE);
break;
case R.id.ly_tab_menu_user:
setSelected();
mTextView4.setSelected(true);
mImageView.setVisibility(View.INVISIBLE);
break;
}
}
}
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代码实现效果图：
利用BottomNavigationBar实现底部导航栏
这篇博客讲得很清楚~