介绍
现在绝大多数主流的应用主界面,都会包含一个底部菜单,就拿腾讯的QQ与微信来说,看起来是这样的
《---我是底部菜单
原理
在很久以前,可以通过TabActivity实现相关功能,自从Fragment出来后,就被抛弃了。
原理也很简单
1、底部菜单通过自定义RadioGroup实现,通过setOnCheckedChangeListener监听切换内容。
2、内容切换,可以使用ViewPager(可以实现直接滑动切换),TabHost,FragmentManager来实现。、
PS:类似的,这样也可以通过HorizontalScrollView+ViewPager+RadioGroup实现类似网易新闻的顶部栏目效果(或者ViewPageIndicator),通过ScrollView.scrollTo((int)RadioButton.getLeft())来自动滑动到当前选择项,有空再写篇文章。
实现
在几种组合搭配来看,我比较喜欢使用Fragment+Tabhost+RadioGroup搭配实现。
首先上首页布局代码activity_main.xml,注意加粗id
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" > <LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFFFF"
android:orientation="vertical" > <FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" > <FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="fill_parent" > <fragment
android:id="@+id/fragment_main"
android:name="com.example.tabmenu.MainFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent" /> <fragment
android:id="@+id/fragment_mycenter"
android:name="com.example.tabmenu.MyCenterFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent" /> <fragment
android:id="@+id/fragment_search"
android:name="com.example.tabmenu.SearchFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</FrameLayout>
</FrameLayout> <TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.0"
android:visibility="gone" />
<!-- 我只是一条线 -->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="3dp"
android:background="@drawable/fbutton_color_emerald" >
</LinearLayout> <RadioGroup
android:id="@+id/radiogroup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="@drawable/fbutton_color_turquoise"
android:gravity="center_vertical"
android:orientation="horizontal" > <!-- android:background="@drawable/bk_footer" --> <RadioButton
android:id="@+id/radio_search"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:background="@drawable/footer_itembg_selector"
android:drawableTop="@drawable/footer_search_selector"
android:text="搜索" /> <RadioButton
android:id="@+id/radio_main"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:background="@drawable/footer_itembg_selector"
android:button="@null"
android:checked="true"
android:drawableTop="@drawable/footer_main_selector"
android:text="首 页" /> <RadioButton
android:id="@+id/radio_mycenter"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:background="@drawable/footer_itembg_selector"
android:drawableTop="@drawable/footer_mycenter_selector"
android:text="个人中心" />
</RadioGroup>
</LinearLayout> </TabHost>
其中RadioButton的样式按照需要自己定义
<style name="main_tab_bottom">
<item name="android:textSize">10sp</item>
<item name="android:textColor">#ffffffff</item>
<item name="android:ellipsize">marquee</item>
<item name="android:gravity">center_horizontal</item>
<item name="android:background">#00000000</item>
<item name="android:paddingTop">2dp</item>
<item name="android:layout_width">fill_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:button">@null</item>
<item name="android:singleLine">true</item>
<item name="android:drawablePadding">2dp</item>
<item name="android:layout_weight">1.0</item>
</style>
MainActivity代码
package com.example.tabmenu; import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost; public class MainActivity extends ActionBarActivity {
// tab用参数
private TabHost tabHost;
private RadioGroup radiogroup;
private int menuid; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radiogroup = (RadioGroup) findViewById(R.id.radiogroup);
tabHost = (TabHost) findViewById(android.R.id.tabhost);
tabHost.setup();
tabHost.addTab(tabHost.newTabSpec("main").setIndicator("main")
.setContent(R.id.fragment_main));
tabHost.addTab(tabHost.newTabSpec("mycenter").setIndicator("mycenter")
.setContent(R.id.fragment_mycenter));
tabHost.addTab(tabHost.newTabSpec("search").setIndicator("search")
.setContent(R.id.fragment_search));
radiogroup.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
menuid = checkedId;
int currentTab = tabHost.getCurrentTab();
switch (checkedId) {
case R.id.radio_main:
tabHost.setCurrentTabByTag("main");
//如果需要动画效果就使用
//setCurrentTabWithAnim(currentTab, 0, "main");
getSupportActionBar().setTitle("首页");
break;
case R.id.radio_mycenter:
//tabHost.setCurrentTabByTag("mycenter");
setCurrentTabWithAnim(currentTab, 1, "mycenter");
getSupportActionBar().setTitle("个人中心"); break;
case R.id.radio_search:
tabHost.setCurrentTabByTag("search");
getSupportActionBar().setTitle("搜索");
}
// 刷新actionbar的menu
getWindow().invalidatePanelMenu(Window.FEATURE_OPTIONS_PANEL);
}
}); } @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present. switch (menuid) {
case R.id.radio_main:
getMenuInflater().inflate(R.menu.main, menu);
break;
case R.id.radio_mycenter:
menu.clear();
break;
case R.id.radio_search:
menu.clear();
break;
}
return true;
} @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
} // 这个方法是关键,用来判断动画滑动的方向
private void setCurrentTabWithAnim(int now, int next, String tag) {
if (now > next) {
tabHost.getCurrentView().startAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));
tabHost.setCurrentTabByTag(tag);
tabHost.getCurrentView().startAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));
} else {
tabHost.getCurrentView().startAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
tabHost.setCurrentTabByTag(tag);
tabHost.getCurrentView().startAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
}
}
}
最后demo截图,其他文件件demo
demo下载地址:
链接:http://pan.baidu.com/s/1dbuKA 密码:84iw
参考:
http://blog.csdn.net/loongggdroid/article/details/9469935
http://blog.csdn.net/eyebrows_cs/article/details/8145913
http://www.cnblogs.com/over140/archive/2011/03/02/1968042.html