Android實現底部導航欄功能（選項卡）

2020-04-11 11:08:22

字體：大中小

來源：轉載

供稿：網友

現在很多android的應用都采用底部導航欄的功能，這樣可以使得用戶在使用過程中隨意切換不同的頁面，現在我采用TabHost組件來自定義一個底部的導航欄的功能。

我們先看下該demo實例的框架圖：

其中各個類的作用以及資源文件就不詳細解釋了，還有資源圖片(在該Demo中借用了其它應用程序的資源圖片)也不提供了，大家可以自行更換自己需要的資源圖片。直接上各個布局文件或各個類的代碼：

1、res/layout目錄下的 maintabs.xml 源碼：

<?xml version="1.0" encoding="UTF-8"?> <TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"  xmlns:android="http://schemas.android.com/apk/res/android">  <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">  <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="0.0dip" android:layout_weight="1.0" />  <TabWidget android:id="@android:id/tabs" android:visibility="gone" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.0" />  <RadioGroup  android:gravity="center_vertical" android:layout_gravity="bottom" android:orientation="horizontal" android:id="@id/main_radio" android:background="@drawable/maintab_toolbar_bg"  android:layout_width="fill_parent" android:layout_height="wrap_content">  <RadioButton android:id="@id/radio_button0" android:layout_marginTop="2.0dip" android:text="@string/main_home" android:drawableTop="@drawable/icon_1_n" style="@style/main_tab_bottom" />  <RadioButton android:id="@id/radio_button1" android:layout_marginTop="2.0dip" android:text="@string/main_news" android:drawableTop="@drawable/icon_2_n" style="@style/main_tab_bottom" />  <RadioButton android:id="@id/radio_button2" android:layout_marginTop="2.0dip" android:text="@string/main_manage_date" android:drawableTop="@drawable/icon_3_n" style="@style/main_tab_bottom" />  <RadioButton android:id="@id/radio_button3" android:layout_marginTop="2.0dip" android:text="@string/main_friends" android:drawableTop="@drawable/icon_4_n" style="@style/main_tab_bottom" />  <RadioButton android:id="@id/radio_button4" android:layout_marginTop="2.0dip" android:text="@string/more" android:drawableTop="@drawable/icon_5_n" style="@style/main_tab_bottom" />  </RadioGroup>  </LinearLayout> </TabHost>

2、res/drawable 下的 home_btn_bg.xml 源碼：

<selector  xmlns:android="http://schemas.android.com/apk/res/android">  <item android:state_focused="true" android:state_enabled="true" android:state_pressed="false" android:drawable="@drawable/home_btn_bg_s" />  <item android:state_enabled="true" android:state_pressed="true" android:drawable="@drawable/home_btn_bg_s" />  <item android:state_enabled="true" android:state_checked="true" android:drawable="@drawable/home_btn_bg_d" />  <item android:drawable="@drawable/transparent" /> </selector>

3、res/values 下的源碼：dimens.xml源碼：

<?xml version="1.0" encoding="utf-8"?> <resources>   <dimen name="bottom_tab_font_size">10.0sp</dimen>  <dimen name="bottom_tab_padding_up">5.0dip</dimen>  <dimen name="bottom_tab_padding_drawable">2.0dip</dimen>  <dimen name="switch_logo_bottom_padding">30.0sp</dimen>  <dimen name="widget_height">100.0dip</dimen>  <dimen name="sta_height">48.0dip</dimen>  <dimen name="large_padding_length">20.0dip</dimen>  <dimen name="widget_write_margin_top">19.0dip</dimen>  <dimen name="widget_write_margin_left">10.0dip</dimen>  <dimen name="widget_content_margin_top">20.0dip</dimen>  <dimen name="widget_content_margin_left">10.0dip</dimen>  <dimen name="widget_logo_size">35.0dip</dimen>  <dimen name="title_height">74.0dip</dimen>  <dimen name="new_blog_size">70.0dip</dimen>  <dimen name="emotion_item_view_height">13.299988dip</dimen>  <dimen name="splash_test_top_margin_top">20.0dip</dimen>  <dimen name="splash_test_center_margin_right">0.0dip</dimen>  <dimen name="title_text_size">20.0sp</dimen>  <dimen name="normal_padding_length">10.0dip</dimen>  <dimen name="no_result_padding_length">50.0dip</dimen>  </resources>

drawables.xml源碼：

<?xml version="1.0" encoding="utf-8"?> <resources>   <item type="drawable" name="ltgray">#fff4f4f4</item>  <item type="drawable" name="ltyellow">#fffff4db</item>  <item type="drawable" name="black">#ff000000</item>  <item type="drawable" name="transparent">#00000000</item>  <item type="drawable" name="widget_edit_block_bg_normal">@android:color/transparent</item>  <item type="drawable" name="transparent_background">#99000000</item>  <item type="drawable" name="list_background">#fff4f4f4</item>  <item type="drawable" name="namcard_picker_bkg_normal">#ff272727</item>  <item type="drawable" name="namcard_picker_bkg_hover">#ff333333</item>  </resources>

ids.xml源碼：

<?xml version="1.0" encoding="utf-8"?> <resources>   <item type="id" name="main_radio">false</item>  <item type="id" name="radio_button0">false</item>  <item type="id" name="radio_button1">false</item>  <item type="id" name="radio_button2">false</item>  <item type="id" name="radio_button3">false</item>  <item type="id" name="radio_button4">false</item>  </resources>

strings.xml源碼：

<?xml version="1.0" encoding="utf-8"?> <resources>  <string name="hello">Hello World, MainTabActivity!</string>  <string name="app_name">TabDemo</string>  <string name="main_news">消息</string>  <string name="main_home">首頁</string>  <string name="more">更多</string>  <string name="main_manage_date">時間</string>  <string name="main_friends">好友</string> </resources>

styles.xml源碼：

<?xml version="1.0" encoding="utf-8"?> <resources>   <style name="main_tab_bottom">  <item name="android:textSize">@dimen/bottom_tab_font_size</item>  <item name="android:textColor">#ffffffff</item>  <item name="android:ellipsize">marquee</item>  <item name="android:gravity">center_horizontal</item>  <item name="android:background">@drawable/home_btn_bg</item>  <item name="android:paddingTop">@dimen/bottom_tab_padding_up</item>  <item name="android:paddingBottom">2.0dip</item>  <item name="android:layout_width">fill_parent</item>  <item name="android:layout_height">wrap_content</item>  <item name="android:layout_marginBottom">2.0dip</item>  <item name="android:button">@null</item>  <item name="android:singleLine">true</item>  <item name="android:drawablePadding">@dimen/bottom_tab_padding_drawable</item>  <item name="android:layout_weight">1.0</item>  </style>  </resources>

4、 src/com.andyidea.tabdemo包下面各個UI界面類源碼：
MainTabActivity.java源碼：

package com.andyidea.tabdemo;  import android.app.TabActivity; import android.content.Intent; import android.os.Bundle; import android.view.Window; import android.widget.CompoundButton; import android.widget.RadioButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.TabHost;  public class MainTabActivity extends TabActivity implements OnCheckedChangeListener{   private TabHost mTabHost;  private Intent mAIntent;  private Intent mBIntent;  private Intent mCIntent;  private Intent mDIntent;  private Intent mEIntent;   /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  requestWindowFeature(Window.FEATURE_NO_TITLE);  setContentView(R.layout.maintabs);   this.mAIntent = new Intent(this,AActivity.class);  this.mBIntent = new Intent(this,BActivity.class);  this.mCIntent = new Intent(this,CActivity.class);  this.mDIntent = new Intent(this,DActivity.class);  this.mEIntent = new Intent(this,EActivity.class);   ((RadioButton) findViewById(R.id.radio_button0))  .setOnCheckedChangeListener(this);  ((RadioButton) findViewById(R.id.radio_button1))  .setOnCheckedChangeListener(this);  ((RadioButton) findViewById(R.id.radio_button2))  .setOnCheckedChangeListener(this);  ((RadioButton) findViewById(R.id.radio_button3))  .setOnCheckedChangeListener(this);  ((RadioButton) findViewById(R.id.radio_button4))  .setOnCheckedChangeListener(this);   setupIntent();  }   @Override  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {  if(isChecked){  switch (buttonView.getId()) {  case R.id.radio_button0:  this.mTabHost.setCurrentTabByTag("A_TAB");  break;  case R.id.radio_button1:  this.mTabHost.setCurrentTabByTag("B_TAB");  break;  case R.id.radio_button2:  this.mTabHost.setCurrentTabByTag("C_TAB");  break;  case R.id.radio_button3:  this.mTabHost.setCurrentTabByTag("D_TAB");  break;  case R.id.radio_button4:  this.mTabHost.setCurrentTabByTag("MORE_TAB");  break;  }  }   }   private void setupIntent() {  this.mTabHost = getTabHost();  TabHost localTabHost = this.mTabHost;   localTabHost.addTab(buildTabSpec("A_TAB", R.string.main_home,  R.drawable.icon_1_n, this.mAIntent));   localTabHost.addTab(buildTabSpec("B_TAB", R.string.main_news,  R.drawable.icon_2_n, this.mBIntent));   localTabHost.addTab(buildTabSpec("C_TAB",  R.string.main_manage_date, R.drawable.icon_3_n,  this.mCIntent));   localTabHost.addTab(buildTabSpec("D_TAB", R.string.main_friends,  R.drawable.icon_4_n, this.mDIntent));   localTabHost.addTab(buildTabSpec("MORE_TAB", R.string.more,  R.drawable.icon_5_n, this.mEIntent));   }   private TabHost.TabSpec buildTabSpec(String tag, int resLabel, int resIcon,  final Intent content) {  return this.mTabHost.newTabSpec(tag).setIndicator(getString(resLabel),  getResources().getDrawable(resIcon)).setContent(content);  } }

其中 AActivity.java 與 BActivity.java ，CActivity.java ，DActivity.java ，EActivity.java 中的源碼都一樣，只是用來表示不同的界面展示，故這里只列出 AActivity.java的源碼：

package com.andyidea.tabdemo;  import android.app.Activity; import android.os.Bundle; import android.view.Gravity; import android.widget.TextView;  public class AActivity extends Activity{   @Override  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);   TextView tv = new TextView(this);  tv.setText("This is A Activity!");  tv.setGravity(Gravity.CENTER);  setContentView(tv);  }  }

最后，大家別忘了在 AndroidManifest.xml 文件中注冊各個 Activity 組件哦。好了，現在我們看下我們程序運行的效果圖：