基于android平台底部菜单实现

android，我发现几乎80%的应用程序，尤其是工具软件、管理软件等。都是一排底部菜单，然后切换来切换去，搞几个页面。这篇文章，是我接触android平台开发的第一篇移动方面的博客。很久了，都没有写的博客，因为自己结束了一段可笑的感情经历，终于解脱了。
我从不说废话，直接上代码。
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配置文件

<?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:orientation="vertical" >        <include layout="@layout/activity_title" />        <FrameLayout            android:id="@android:id/tabcontent"            android:layout_width="fill_parent"            android:layout_height="0.0dip"            android:layout_weight="1.0" />        <TabWidget            android:id="@android:id/tabs"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="0.0"            android:visibility="gone" />        <RadioGroup            android:id="@+id/main_radio"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_gravity="bottom"            android:gravity="center_vertical"            android:orientation="horizontal" >            <RadioButton                android:id="@+id/radio_btn0"                style="@style/main_tab_bottom"                android:checked="true"                android:drawableTop="@drawable/drawable_home"                android:selectAllOnFocus="false"                android:tag="radio_btn0"                android:text="@string/btn0" />            <RadioButton                android:id="@+id/radio_btn1"                style="@style/main_tab_bottom"                android:drawableTop="@drawable/drawable_news"                android:tag="radio_btn1"                android:text="@string/btn1" />            <RadioButton                android:id="@+id/radio_btn2"                style="@style/main_tab_bottom"                android:drawableTop="@drawable/drawable_notice"                android:tag="radio_btn2"                android:text="@string/btn2" />            <RadioButton                android:id="@+id/radio_btn3"                style="@style/main_tab_bottom"                android:drawableTop="@drawable/drawable_topic"                android:tag="radio_btn3"                android:text="@string/btn3" />            <RadioButton                android:id="@+id/radio_btn4"                style="@style/main_tab_bottom"                android:drawableTop="@drawable/drawable_exit"                android:tag="radio_btn4"                android:text="@string/btn4" />        </RadioGroup>    </LinearLayout></TabHost>

activity

package com.example.test;import android.app.AlertDialog;import android.app.TabActivity;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;import android.widget.TabHost;import android.widget.TextView;@SuppressWarnings("deprecation")public class MainActivity extends TabActivity implements OnCheckedChangeListener{private TabHost mHost = null;private RadioGroup radioGroup = null;private RadioButton currentRadioBtn = null;private RadioButton previousRadioBtn = null;private TextView currentTitle = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);previousRadioBtn = (RadioButton)findViewById(R.id.radio_btn0);mHost = this.getTabHost();mHost.addTab(mHost.newTabSpec("ONE").setIndicator("ONE").setContent(new Intent(this,OneActivity.class)));mHost.addTab(mHost.newTabSpec("TWO").setIndicator("TWO").setContent(new Intent(this,TwoActivity.class)));mHost.addTab(mHost.newTabSpec("THREE").setIndicator("THREE").setContent(new Intent(this,ThreeActivity.class)));mHost.addTab(mHost.newTabSpec("FOUR").setIndicator("FOUR").setContent(new Intent(this,FourActivity.class)));mHost.addTab(mHost.newTabSpec("FIVE").setIndicator("FIVE").setContent(new Intent(this,FiveActivity.class)));radioGroup = (RadioGroup) findViewById(R.id.main_radio);   radioGroup.setOnCheckedChangeListener(this);   this.getWindow().setBackgroundDrawable(this.getResources().getDrawable(R.drawable.backColor));}@Override  public void onCheckedChanged(RadioGroup group, final int checkedId) {   currentRadioBtn = (RadioButton)findViewById(checkedId); currentTitle = (TextView)findViewById(R.id.title);switch(checkedId){   case R.id.radio_btn0:   mHost.setCurrentTabByTag("ONE");   currentTitle.setText(R.string.btn0);break;   case R.id.radio_btn1:   mHost.setCurrentTabByTag("TWO");currentTitle.setText(R.string.btn1);break;   case R.id.radio_btn2:   mHost.setCurrentTabByTag("THREE");   currentTitle.setText(R.string.btn2);break;   case R.id.radio_btn3:   mHost.setCurrentTabByTag("FOUR");   currentTitle.setText(R.string.btn3);break;   case R.id.radio_btn4:   AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setMessage(R.string.confirmExit).setCancelable(false).setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {MainActivity.this.finish();}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {if(previousRadioBtn!=null){previousRadioBtn.setChecked(true);}dialog.cancel();}});builder.create().show();break;   }if(checkedId!=R.id.radio_btn4){previousRadioBtn = (RadioButton)findViewById(checkedId);}}   }

效果图

[img]

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