记得之前写过2篇关于底部菜单的实现,由于使用的是过时的TabHost类,虽然一样可以实现我们想要的效果,但作为学习,还是需要来了解下这个新引入类FragmentTabHost
之前2篇文章的链接:
安卓开发复习笔记——TabHost组件(一)(实现底部菜单导航)
安卓开发复习笔记——TabHost组件(二)(实现底部菜单导航)
关于Fragment类在之前的安卓开发复习笔记——Fragment+ViewPager组件(高仿微信界面)也介绍过,这里就不再重复阐述了。
国际惯例,先来张效果图:
下面直接上代码了,注释很全,看过我前2篇文章的朋友,肯定秒懂的,哈哈~
activity_main.xml(主布局文件)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" > <!-- 存放主要页面内容 --> <FrameLayout
android:id="@+id/maincontent"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</FrameLayout> <!-- 底层菜单 --> <android.support.v4.app.FragmentTabHost
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/maintab_toolbar_bg" > <FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0" >
</FrameLayout>
</android.support.v4.app.FragmentTabHost> </LinearLayout>
fragment.xml(由于只有文字不同,这里只给出一个)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
> <TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="我是第一个Fragment"
android:textSize="20dp"
/> </RelativeLayout>
tabcontent.xml(具体底部菜单详细布局)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical" > <ImageView
android:id="@+id/image"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
/>
<TextView
android:id="@+id/text"
android:padding="2dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/white"
/> </LinearLayout>
bt_selector.xml(底部菜单点击背景)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/home_btn_bg" android:state_pressed="true"></item>
<item android:drawable="@drawable/home_btn_bg" android:state_selected="true"></item> </selector>
bt_home_selector.xml(底部菜单按钮效果)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/icon_home_sel" android:state_selected="true"></item>
<item android:drawable="@drawable/icon_home_nor"></item> </selector>
FragmentPage1-FragmentPage5.java
package com.example.newtabhosttest; import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup; public class FragmentPage1 extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment1, null);
} }
MainActivity.java(主代码)
package com.example.newtabhosttest; import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost.TabSpec;
import android.widget.TextView; public class MainActivity extends FragmentActivity { private FragmentTabHost fragmentTabHost;
private String texts[] = { "首页", "消息", "好友", "广场", "更多" };
private int imageButton[] = { R.drawable.bt_home_selector,
R.drawable.bt_message_selector, R.drawable.bt_selfinfo_selector,R.drawable.bt_square_selector ,R.drawable.bt_more_selector};
private Class fragmentArray[] = {FragmentPage1.class,FragmentPage2.class,FragmentPage3.class,FragmentPage4.class,FragmentPage5.class}; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); // 实例化tabhost
fragmentTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
fragmentTabHost.setup(this, getSupportFragmentManager(),
R.id.maincontent); for (int i = 0; i < texts.length; i++) {
TabSpec spec=fragmentTabHost.newTabSpec(texts[i]).setIndicator(getView(i)); fragmentTabHost.addTab(spec, fragmentArray[i], null); //设置背景(必须在addTab之后,由于需要子节点(底部菜单按钮)否则会出现空指针异常)
fragmentTabHost.getTabWidget().getChildAt(i).setBackgroundResource(R.drawable.bt_selector);
} } private View getView(int i) {
//取得布局实例
View view=View.inflate(MainActivity.this, R.layout.tabcontent, null); //取得布局对象
ImageView imageView=(ImageView) view.findViewById(R.id.image);
TextView textView=(TextView) view.findViewById(R.id.text); //设置图标
imageView.setImageResource(imageButton[i]);
//设置标题
textView.setText(texts[i]);
return view;
} }
到这里代码就结束了,要是有哪里疑惑的朋友可以给我留言,如果觉得文章对您有用的话,请给个赞,谢谢支持!^_^