Android开发

Android UI实现底部切换标签fragment

本文主要是介绍Android UI实现底部切换标签fragment,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

本篇博客要分享的一个UI效果——实现底部切换标签,想必大家在一些应用上面遇到过这种效果了,最典型的就是微信了,可以左右滑动切换页面,也可以点击标签页滑动页面,它们是如何实现的呢,本篇博客为了简单只介绍如何实现点击底部切换标签页。

先来看看我们想实现的效果图: 


 

这样的页面实现起来其实很简单的,首先我们从布局入手:
 分为三部分
 第一部分:顶部导航栏布局
 第二部分:中部显示内容布局
 第三部分:底部标签布局

 /BottomTabDemo/res/layout/activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" > 
 
 <RelativeLayout 
  android:id="@+id/rl_main" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" > 
 
  <!-- 顶部 --> 
 
  <RelativeLayout 
   android:id="@+id/top_tab" 
   android:layout_width="match_parent" 
   android:layout_height="50dip" 
   android:background="@color/topbar_bg" > 
 
   <ImageView 
    android:id="@+id/iv_logo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerInParent="true" 
    android:focusable="false" 
    android:src="@drawable/zhidao_logo" 
    android:contentDescription="@null" /> 
 
  </RelativeLayout> 
 
  <!-- 底部tab --> 
 
  <LinearLayout 
   android:id="@+id/ll_bottom_tab" 
   android:layout_width="match_parent" 
   android:layout_height="54dp" 
   android:layout_alignParentBottom="true" 
   android:gravity="center_vertical" 
   android:orientation="horizontal" 
   android:baselineAligned="true"> 
 
   <RelativeLayout 
    android:id="@+id/rl_know" 
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    android:layout_weight="1.0" > 
 
    <ImageView 
     android:id="@+id/iv_know" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:src="@drawable/btn_know_nor" 
     android:contentDescription="@null"/> 
 
    <TextView 
     android:id="@+id/tv_know" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@id/iv_know" 
     android:layout_centerHorizontal="true" 
     android:text="@string/bottom_tab_know" 
     android:textColor="@color/bottomtab_normal" 
     android:textSize="12sp" /> 
   </RelativeLayout> 
 
   <RelativeLayout 
    android:id="@+id/rl_want_know" 
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    android:layout_weight="1.0" > 
 
    <ImageView 
     android:id="@+id/iv_i_want_know" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:src="@drawable/btn_wantknow_nor" 
     android:contentDescription="@null" /> 
 
    <TextView 
     android:id="@+id/tv_i_want_know" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/iv_i_want_know" 
     android:layout_centerHorizontal="true" 
     android:text="@string/bottom_tab_wantknow" 
     android:textColor="@color/bottomtab_normal" 
     android:textSize="12sp" /> 
   </RelativeLayout> 
 
   <RelativeLayout 
    android:id="@+id/rl_me" 
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    android:layout_weight="1.0" > 
 
    <ImageView 
     android:id="@+id/iv_me" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:src="@drawable/btn_my_nor" 
     android:contentDescription="@null" /> 
     
 
    <TextView 
     android:id="@+id/tv_me" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/iv_me" 
     android:layout_centerHorizontal="true" 
     android:text="@string/bottom_tab_my" 
     android:textColor="@color/bottomtab_normal" 
     android:textSize="12sp" /> 
   </RelativeLayout> 
  </LinearLayout> 
 
  <!-- 内容部分, fragment切换 --> 
 
  <LinearLayout 
   android:id="@+id/content_layout" 
   android:layout_width="match_parent" 
   android:layout_height="match_parent" 
   android:layout_above="@+id/line" 
   android:layout_below="@+id/top_tab" 
   android:orientation="vertical" > 
  </LinearLayout> 
 
  <View 
   android:id="@+id/line" 
   android:layout_width="match_parent" 
   android:layout_height="1dp" 
   android:layout_above="@id/ll_bottom_tab" 
   android:background="@color/line" /> 
 </RelativeLayout> 
  
</FrameLayout> 

以上是布局代码,下面就介绍如何通过点击标签切换Fragment:
我们会发现,初始的时候是选中第一个标签页,图片和字体的颜色区别于另外两个标签页,所以我们要做的就是切换标签的时候,就改变标签的状态
主要改两个内容:

  • 图片
  • 文字颜色

然后我们切换标签显示的是不同的Fragment,这里我们有三个Fragment,所以我们定义三个不同的Fragment界面:
/BottomTabDemo/src/com/xiaowu/bottomtab/demo/ZhidaoFragment.java
/BottomTabDemo/src/com/xiaowu/bottomtab/demo/IWantKnowFragment.java
/BottomTabDemo/src/com/xiaowu/bottomtab/demo/MeFragment.java

每个Fragment对应不同的布局文件:
/BottomTabDemo/res/layout/main_tab1_fragment.xml
/BottomTabDemo/res/layout/main_tab2_fragment.xml
/BottomTabDemo/res/layout/main_tab3_fragment.xml

ok,这些定义好之后,我们就在主界面上编写切换的代码了,如何对Fragment进行切换呢,定义以下方法:

/** 
  * 添加或者显示碎片 
  * 
  * @param transaction 
  * @param fragment 
  */ 
 private void addOrShowFragment(FragmentTransaction transaction, 
   Fragment fragment) { 
  if (currentFragment == fragment) 
   return; 
 
  if (!fragment.isAdded()) { // 如果当前fragment未被添加,则添加到Fragment管理器中 
   transaction.hide(currentFragment) 
     .add(R.id.content_layout, fragment).commit(); 
  } else { 
   transaction.hide(currentFragment).show(fragment).commit(); 
  } 
 
  currentFragment = fragment; 
 } 

完整代码如下:
/BottomTabDemo/src/com/xiaowu/bottomtab/demo/MainActivity.java 

package com.xiaowu.bottomtab.demo; 
 
 
 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentTransaction; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ImageView; 
import android.widget.RelativeLayout; 
import android.widget.TextView; 
 
/** 
 * 主Activity 
 * 
 * @author wwj_748 
 * 
 */ 
public class MainActivity extends FragmentActivity implements OnClickListener { 
 
 // 三个tab布局 
 private RelativeLayout knowLayout, iWantKnowLayout, meLayout; 
 
 // 底部标签切换的Fragment 
 private Fragment knowFragment, iWantKnowFragment, meFragment, 
   currentFragment; 
 // 底部标签图片 
 private ImageView knowImg, iWantKnowImg, meImg; 
 // 底部标签的文本 
 private TextView knowTv, iWantKnowTv, meTv; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
 
  initUI(); 
  initTab(); 
 } 
 
 /** 
  * 初始化UI 
  */ 
 private void initUI() { 
  knowLayout = (RelativeLayout) findViewById(R.id.rl_know); 
  iWantKnowLayout = (RelativeLayout) findViewById(R.id.rl_want_know); 
  meLayout = (RelativeLayout) findViewById(R.id.rl_me); 
  knowLayout.setOnClickListener(this); 
  iWantKnowLayout.setOnClickListener(this); 
  meLayout.setOnClickListener(this); 
 
  knowImg = (ImageView) findViewById(R.id.iv_know); 
  iWantKnowImg = (ImageView) findViewById(R.id.iv_i_want_know); 
  meImg = (ImageView) findViewById(R.id.iv_me); 
  knowTv = (TextView) findViewById(R.id.tv_know); 
  iWantKnowTv = (TextView) findViewById(R.id.tv_i_want_know); 
  meTv = (TextView) findViewById(R.id.tv_me); 
 
 } 
 
 /** 
  * 初始化底部标签 
  */ 
 private void initTab() { 
  if (knowFragment == null) { 
   knowFragment = new ZhidaoFragment(); 
  } 
 
  if (!knowFragment.isAdded()) { 
   // 提交事务 
   getSupportFragmentManager().beginTransaction() 
     .add(R.id.content_layout, knowFragment).commit(); 
 
   // 记录当前Fragment 
   currentFragment = knowFragment; 
   // 设置图片文本的变化 
   knowImg.setImageResource(R.drawable.btn_know_pre); 
   knowTv.setTextColor(getResources() 
     .getColor(R.color.bottomtab_press)); 
   iWantKnowImg.setImageResource(R.drawable.btn_wantknow_nor); 
   iWantKnowTv.setTextColor(getResources().getColor( 
     R.color.bottomtab_normal)); 
   meImg.setImageResource(R.drawable.btn_my_nor); 
   meTv.setTextColor(getResources().getColor(R.color.bottomtab_normal)); 
 
  } 
 
 } 
 
 @Override 
 public void onClick(View view) { 
  switch (view.getId()) { 
  case R.id.rl_know: // 知道 
   clickTab1Layout(); 
   break; 
  case R.id.rl_want_know: // 我想知道 
   clickTab2Layout(); 
   break; 
  case R.id.rl_me: // 我的 
   clickTab3Layout(); 
   break; 
  default: 
   break; 
  } 
 } 
 
 /** 
  * 点击第一个tab 
  */ 
 private void clickTab1Layout() { 
  if (knowFragment == null) { 
   knowFragment = new ZhidaoFragment(); 
  } 
  addOrShowFragment(getSupportFragmentManager().beginTransaction(), knowFragment); 
   
  // 设置底部tab变化 
  knowImg.setImageResource(R.drawable.btn_know_pre); 
  knowTv.setTextColor(getResources().getColor(R.color.bottomtab_press)); 
  iWantKnowImg.setImageResource(R.drawable.btn_wantknow_nor); 
  iWantKnowTv.setTextColor(getResources().getColor( 
    R.color.bottomtab_normal)); 
  meImg.setImageResource(R.drawable.btn_my_nor); 
  meTv.setTextColor(getResources().getColor(R.color.bottomtab_normal)); 
 } 
 
 /** 
  * 点击第二个tab 
  */ 
 private void clickTab2Layout() { 
  if (iWantKnowFragment == null) { 
   iWantKnowFragment = new IWantKnowFragment(); 
  } 
  addOrShowFragment(getSupportFragmentManager().beginTransaction(), iWantKnowFragment); 
   
  knowImg.setImageResource(R.drawable.btn_know_nor); 
  knowTv.setTextColor(getResources().getColor(R.color.bottomtab_normal)); 
  iWantKnowImg.setImageResource(R.drawable.btn_wantknow_pre); 
  iWantKnowTv.setTextColor(getResources().getColor( 
    R.color.bottomtab_press)); 
  meImg.setImageResource(R.drawable.btn_my_nor); 
  meTv.setTextColor(getResources().getColor(R.color.bottomtab_normal)); 
 
 } 
 
 /** 
  * 点击第三个tab 
  */ 
 private void clickTab3Layout() { 
  if (meFragment == null) { 
   meFragment = new MeFragment(); 
  } 
   
  addOrShowFragment(getSupportFragmentManager().beginTransaction(), meFragment); 
  knowImg.setImageResource(R.drawable.btn_know_nor); 
  knowTv.setTextColor(getResources().getColor(R.color.bottomtab_normal)); 
  iWantKnowImg.setImageResource(R.drawable.btn_wantknow_nor); 
  iWantKnowTv.setTextColor(getResources().getColor( 
    R.color.bottomtab_normal)); 
  meImg.setImageResource(R.drawable.btn_my_pre); 
  meTv.setTextColor(getResources().getColor(R.color.bottomtab_press)); 
   
 } 
 
 /** 
  * 添加或者显示碎片 
  * 
  * @param transaction 
  * @param fragment 
  */ 
 private void addOrShowFragment(FragmentTransaction transaction, 
   Fragment fragment) { 
  if (currentFragment == fragment) 
   return; 
 
  if (!fragment.isAdded()) { // 如果当前fragment未被添加,则添加到Fragment管理器中 
   transaction.hide(currentFragment) 
     .add(R.id.content_layout, fragment).commit(); 
  } else { 
   transaction.hide(currentFragment).show(fragment).commit(); 
  } 
 
  currentFragment = fragment; 
 } 
 
} 

源码下载:http://xiazai.zyiz.net/201612/yuanma/AndroidBottomTab(zyiz.net).rar

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