既然 Fragment 取代了TabActivity，当然 TabActivity 的能实现的菜单栏，Fragment 当然也能实现。主要其实就是通过菜单栏的点击事件切换 Fragment 的显示和隐藏。
来看看栗子吧：
1.效果图来了：
2.代码具体实现
2.1 自定义底部菜单栏实现方式
(1)对应的 Fragment 编辑代码和布局实现在前面的Fragment介绍和简单实现 中已经有提及，代码中没复杂的地方，此处略过，具体可看实例代码。
(2)菜单栏实现，这里使用代码实现的，其实也可以用布局文件实现，代码如下：
package com.yanis.yc_ui_fragment_menu; import android.content.Context;
import android.graphics.Color;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView; /**
*
* @author YeChao
* @功能描述：自定义底部工具栏
*
*/
public class ViewIndicator extends LinearLayout implements OnClickListener {
private int mDefaultIndicator = 0; // 默认的选定View private static int mCurIndicator; // 当前选定View private static View[] mIndicators; // View集合 private OnIndicateListener mOnIndicateListener; // 对应的监听器
// 对应的图标Tag
private static final String TAG_ICON_0 = "icon_tag_0";
private static final String TAG_ICON_1 = "icon_tag_1";
private static final String TAG_ICON_2 = "icon_tag_2";
private static final String TAG_ICON_3 = "icon_tag_3";
private static final String TAG_ICON_4 = "icon_tag_4";
// 对应的文字Tag
private static final String TAG_TEXT_0 = "text_tag_0";
private static final String TAG_TEXT_1 = "text_tag_1";
private static final String TAG_TEXT_2 = "text_tag_2";
private static final String TAG_TEXT_3 = "text_tag_3";
private static final String TAG_TEXT_4 = "text_tag_4";
// 未选中状态
private static final int COLOR_UNSELECT = Color.argb(100, 0xff, 0xff, 0xff);
// 选中状态
private static final int COLOR_SELECT = Color.WHITE; // 构造函数
public ViewIndicator(Context context) {
super(context);
} public ViewIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
mCurIndicator = mDefaultIndicator;
setOrientation(LinearLayout.HORIZONTAL);// 水平布局
init();
} /**
* 菜单视图布局
*
* @param iconResID
* 图片资源ID
* @param stringResID
* 文字资源ID
* @param stringColor
* 颜色资源ID
* @param iconTag
* 图片标签
* @param textTag
* 文字标签
* @return
*/
private View createIndicator(int iconResID, int stringResID,
int stringColor, String iconTag, String textTag) {
// 实例一个LinearLayout
LinearLayout view = new LinearLayout(getContext());
view.setOrientation(LinearLayout.VERTICAL);// 垂直布局
// 设置宽高和权重
view.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1));
view.setGravity(Gravity.CENTER_HORIZONTAL);
view.setBackgroundResource(R.drawable.main_tab_item_bg_normal);
// 实例一个ImageView
ImageView iconView = new ImageView(getContext());
// 设置与该ImageView视图相关联的标记
iconView.setTag(iconTag);
// 设置宽高和权重
iconView.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1));
iconView.setImageResource(iconResID);// 设置图片资源
// 实例一个TextView
TextView textView = new TextView(getContext());
// 设置与该TextView视图相关联的标记
textView.setTag(textTag);
// 设置宽高和权重
textView.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1));
// 设置文字颜色
textView.setTextColor(stringColor);
// 设置文字大小
textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16);
// 设置文字资源
textView.setText(stringResID);
// 添加视图到布局中
view.addView(iconView);
view.addView(textView);
// 返回布局视图
return view; } /**
* 初始化视图
*/
private void init() {
mIndicators = new View[5];// 5个View
// 第一个为默认选中的
// 主页main_tab_item_bg_normal
mIndicators[0] = createIndicator(R.drawable.main_tab_item_home_focus,
R.string.tab_item_home, COLOR_SELECT, TAG_ICON_0, TAG_TEXT_0);
mIndicators[0].setBackgroundResource(R.drawable.main_tab_item_bg);
mIndicators[0].setTag(Integer.valueOf(0));
mIndicators[0].setOnClickListener(this);
addView(mIndicators[0]);
// 分类
mIndicators[1] = createIndicator(
R.drawable.main_tab_item_category_normal,
R.string.tab_item_category, COLOR_UNSELECT, TAG_ICON_1,
TAG_TEXT_1);
mIndicators[1].setBackgroundResource(R.drawable.main_tab_item_bg);
mIndicators[1].setTag(Integer.valueOf(1));
mIndicators[1].setOnClickListener(this);
addView(mIndicators[1]);
// 下载
mIndicators[2] = createIndicator(R.drawable.main_tab_item_down_normal,
R.string.tab_item_down, COLOR_UNSELECT, TAG_ICON_2, TAG_TEXT_2);
mIndicators[2].setBackgroundResource(R.drawable.main_tab_item_bg);
mIndicators[2].setTag(Integer.valueOf(2));
mIndicators[2].setOnClickListener(this);
addView(mIndicators[2]);
// 我的
mIndicators[3] = createIndicator(R.drawable.main_tab_item_user_normal,
R.string.tab_item_user, COLOR_UNSELECT, TAG_ICON_3, TAG_TEXT_3);
mIndicators[3].setBackgroundResource(R.drawable.main_tab_item_bg);
mIndicators[3].setTag(Integer.valueOf(3));
mIndicators[3].setOnClickListener(this);
addView(mIndicators[3]);
// 设置
mIndicators[4] = createIndicator(
R.drawable.main_tab_item_setting_normal,
R.string.tab_item_setting, COLOR_UNSELECT, TAG_ICON_4,
TAG_TEXT_4);
mIndicators[4].setBackgroundResource(R.drawable.main_tab_item_bg);
mIndicators[4].setTag(Integer.valueOf(4));
mIndicators[4].setOnClickListener(this);
addView(mIndicators[4]);
} public static void setIndicator(int which) {
// /////////////////清除之前的状态/////////////////////////////////
// mIndicators[mCurIndicator].setBackgroundResource(R.drawable.main_tab_item_bg_normal);
ImageView prevIcon;
TextView prevText;
switch (mCurIndicator) {
case 0:
prevIcon = (ImageView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_ICON_0);
prevIcon.setImageResource(R.drawable.main_tab_item_home);
prevText = (TextView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_TEXT_0);
prevText.setTextColor(COLOR_UNSELECT);
break;
case 1:
prevIcon = (ImageView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_ICON_1);
prevIcon.setImageResource(R.drawable.main_tab_item_category);
prevText = (TextView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_TEXT_1);
prevText.setTextColor(COLOR_UNSELECT);
break;
case 2:
prevIcon = (ImageView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_ICON_2);
prevIcon.setImageResource(R.drawable.main_tab_item_down);
prevText = (TextView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_TEXT_2);
prevText.setTextColor(COLOR_UNSELECT);
break;
case 3:
prevIcon = (ImageView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_ICON_3);
prevIcon.setImageResource(R.drawable.main_tab_item_user);
prevText = (TextView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_TEXT_3);
prevText.setTextColor(COLOR_UNSELECT);
break;
case 4:
prevIcon = (ImageView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_ICON_4);
prevIcon.setImageResource(R.drawable.main_tab_item_setting);
prevText = (TextView) mIndicators[mCurIndicator]
.findViewWithTag(TAG_TEXT_4);
prevText.setTextColor(COLOR_UNSELECT);
break;
}
// /////////////////更新前状态/////////////////////////////////
// mIndicators[which].setBackgroundResource(R.drawable.main_tab_item_bg_focus);
ImageView currIcon;
TextView currText;
/**
* 设置选中状态
*/
switch (which) {
case 0:
currIcon = (ImageView) mIndicators[which]
.findViewWithTag(TAG_ICON_0);
currIcon.setImageResource(R.drawable.main_tab_item_home_focus);
currText = (TextView) mIndicators[which]
.findViewWithTag(TAG_TEXT_0);
currText.setTextColor(COLOR_SELECT);
break;
case 1:
currIcon = (ImageView) mIndicators[which]
.findViewWithTag(TAG_ICON_1);
currIcon.setImageResource(R.drawable.main_tab_item_category_focus);
currText = (TextView) mIndicators[which]
.findViewWithTag(TAG_TEXT_1);
currText.setTextColor(COLOR_SELECT);
break;
case 2:
currIcon = (ImageView) mIndicators[which]
.findViewWithTag(TAG_ICON_2);
currIcon.setImageResource(R.drawable.main_tab_item_down_focus);
currText = (TextView) mIndicators[which]
.findViewWithTag(TAG_TEXT_2);
currText.setTextColor(COLOR_SELECT);
break;
case 3:
currIcon = (ImageView) mIndicators[which]
.findViewWithTag(TAG_ICON_3);
currIcon.setImageResource(R.drawable.main_tab_item_user_focus);
currText = (TextView) mIndicators[which]
.findViewWithTag(TAG_TEXT_3);
currText.setTextColor(COLOR_SELECT);
break;
case 4:
currIcon = (ImageView) mIndicators[which]
.findViewWithTag(TAG_ICON_4);
currIcon.setImageResource(R.drawable.main_tab_item_setting_focus);
currText = (TextView) mIndicators[which]
.findViewWithTag(TAG_TEXT_4);
currText.setTextColor(COLOR_SELECT);
break;
} mCurIndicator = which;
} public interface OnIndicateListener {
public void onIndicate(View v, int which);
} public void setOnIndicateListener(OnIndicateListener listener) {
mOnIndicateListener = listener;
} @Override
public void onClick(View v) {
if (mOnIndicateListener != null) {
int tag = (Integer) v.getTag();
switch (tag) {
case 0:
if (mCurIndicator != 0) {
mOnIndicateListener.onIndicate(v, 0);
setIndicator(0);
}
break;
case 1:
if (mCurIndicator != 1) {
mOnIndicateListener.onIndicate(v, 1);
setIndicator(1);
}
break;
case 2:
if (mCurIndicator != 2) {
mOnIndicateListener.onIndicate(v, 2);
setIndicator(2);
}
break;
case 3:
if (mCurIndicator != 3) {
mOnIndicateListener.onIndicate(v, 3);
setIndicator(3);
}
break;
case 4:
if (mCurIndicator != 4) {
mOnIndicateListener.onIndicate(v, 4);
setIndicator(4);
}
break;
default:
break;
}
}
}
}
ViewIndicator
(3)最后就是主界面代码，切换 Fragment 的显示和隐藏以及菜单栏的选中状态
package com.yanis.yc_ui_fragment_menu; import com.yanis.yc_ui_fragment_menu.ViewIndicator.OnIndicateListener;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.View; public class MainActivity extends FragmentActivity {
public static Fragment[] mFragments; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); setFragmentIndicator(0);
} /**
* 初始化fragment
*/
private void setFragmentIndicator(int whichIsDefault) {
//实例化 Fragment 集合
mFragments = new Fragment[5];
mFragments[0] = getSupportFragmentManager().findFragmentById(R.id.fragment_home);
mFragments[1] = getSupportFragmentManager().findFragmentById(R.id.fragment_category);
mFragments[2] = getSupportFragmentManager().findFragmentById(R.id.fragment_down);
mFragments[3] = getSupportFragmentManager().findFragmentById(R.id.fragment_user);
mFragments[4] = getSupportFragmentManager().findFragmentById(R.id.fragment_setting);
//显示默认的Fragment
getSupportFragmentManager().beginTransaction().hide(mFragments[0])
.hide(mFragments[1]).hide(mFragments[2]).hide(mFragments[3]).hide(mFragments[4]).show(mFragments[whichIsDefault]).commit();
//绑定自定义的菜单栏组件
ViewIndicator mIndicator = (ViewIndicator) findViewById(R.id.indicator);
ViewIndicator.setIndicator(whichIsDefault);
mIndicator.setOnIndicateListener(new OnIndicateListener() {
@Override
public void onIndicate(View v, int which) {
//显示指定的Fragment
getSupportFragmentManager().beginTransaction()
.hide(mFragments[0]).hide(mFragments[1])
.hide(mFragments[2]).hide(mFragments[3]).hide(mFragments[4]).show(mFragments[which]).commit();
}
});
}
}
源代码地址：https://github.com/YeXiaoChao/Yc_ui_fragment_menu
2.2 使用 Fragment+FragmentTabHost 来实现底部菜单栏方式
效果是一样的，只是在上面的基础上使用 FragmentTabHost 来实现底部菜单栏，直接通过 FragmentTabHost 来切换 Fragment 的显示 ，而不是自定义的布局。
（1）修改主布局代码，加入了FragmentTabHost 组件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" > <FrameLayout
android:id="@+id/realtabcontent"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1" /> <android.support.v4.app.FragmentTabHost
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/main_tab_item_bg"> <FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0" />
</android.support.v4.app.FragmentTabHost> </LinearLayout>
（2）单独为Tab按钮选项布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical" > <ImageView
android:id="@+id/imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:padding="3dp"
android:src="@drawable/main_tab_item_home">
</ImageView> <TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="12sp"
android:textColor="#ffffff">
</TextView> </LinearLayout>
(3) fragment布局界面和之前一样，就不再赘述
(4) Tab选项的自定义按钮中图片资源文件，列出其中一个按钮，指定了按钮的选中状态和不选中状态不同的图片显示
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/main_tab_item_home_focus" android:state_selected="true"/>
<item android:drawable="@drawable/main_tab_item_home_normal"/> </selector>
(5) Tab选项按钮背景资源文件，指定了点击的效果
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> <!-- pressed -->
<item android:drawable="@drawable/main_tab_item_bg_focus" android:state_enabled="true" android:state_pressed="true"/> <!-- focused -->
<item android:drawable="@drawable/main_tab_item_bg_focus" android:state_enabled="true" android:state_focused="true"/> <!-- normal -->
<item android:drawable="@drawable/main_tab_item_bg_normal" android:state_enabled="true"/> </selector>
（6） 最后就是主界面代码的改变
package com.yanis.yc_ui_fragment_tabhost; import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost.TabSpec;
import android.widget.TextView; /**
*
* @author yechao
* @功能说明 自定义TabHost
*
*/
public class MainActivity extends FragmentActivity {
// 定义FragmentTabHost对象
private FragmentTabHost mTabHost; // 定义一个布局
private LayoutInflater layoutInflater; // 定义数组来存放Fragment界面
private Class fragmentArray[] = { FragmentHome.class,
FragmentCategory.class, FragmentDown.class, FragmentUser.class,
FragmentSetting.class }; // 定义数组来存放按钮图片
private int mImageViewArray[] = { R.drawable.main_tab_item_home,
R.drawable.main_tab_item_category, R.drawable.main_tab_item_down,
R.drawable.main_tab_item_user, R.drawable.main_tab_item_setting }; // Tab选项卡的文字
private String mTextviewArray[] = { "主页", "分类", "下载", "我的", "设置" }; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); initView();
} /**
* 初始化组件
*/
private void initView() {
// 实例化布局对象
layoutInflater = LayoutInflater.from(this); // 实例化TabHost对象，得到TabHost
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent); // 得到fragment的个数
int count = fragmentArray.length; for (int i = 0; i < count; i++) {
// 为每一个Tab按钮设置图标、文字和内容
TabSpec tabSpec = mTabHost.newTabSpec(mTextviewArray[i])
.setIndicator(getTabItemView(i));
// 将Tab按钮添加进Tab选项卡中
mTabHost.addTab(tabSpec, fragmentArray[i], null);
// 设置Tab按钮的背景
mTabHost.getTabWidget().getChildAt(i)
.setBackgroundResource(R.drawable.main_tab_item_bg);
}
} /**
* 给Tab按钮设置图标和文字
*/
private View getTabItemView(int index) {
View view = layoutInflater.inflate(R.layout.tab_item_view, null); ImageView imageView = (ImageView) view.findViewById(R.id.imageview);
imageView.setImageResource(mImageViewArray[index]); TextView textView = (TextView) view.findViewById(R.id.textview);
textView.setText(mTextviewArray[index]); return view;
}
}