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Android UI实现底部切换标签fragment

2019-12-12 04:21:43
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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.VeVB.COm/201612/yuanma/AndroidBottomTab(VeVB.COm).rar

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