Android 应用 ActivityGroup 来切换 Activity 和 Layout

????????? 在一个主界面中做Activity切换一般都会用TabActivity，使用方便，Activity互相之间相对独立，但是可定制性不强，而且修改起来很麻烦。当然也可以把layout分开，把逻辑代码全写在主界面的逻辑代码中，但是很明显可维护性相当差，这里通过 ActivityGroup来解决这个问题。

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package com.ffly.demo;import android.app.ActivityGroup;import android.app.LocalActivityManager;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.ScrollView;public class MainActivity extends ActivityGroup implements OnClickListener {	private ScrollView mScroll = null;	private ImageView mImgBtn1 = null;	private ImageView mImgBtn2 = null;	private ImageView mImgBtn3 = null;	private LocalActivityManager mActivityManager = null;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		mScroll = (ScrollView) findViewById(R.id.containerBody);		mImgBtn1 = (ImageView) findViewById(R.id.btnModule1);		mImgBtn2 = (ImageView) findViewById(R.id.btnModule2);		mImgBtn3 = (ImageView) findViewById(R.id.btnModule3);				mImgBtn1.setOnClickListener(this);		mImgBtn2.setOnClickListener(this);		mImgBtn3.setOnClickListener(this);				mActivityManager = getLocalActivityManager();	}	@Override	public void onClick(View v) {		switch (v.getId()) {		case R.id.btnModule1:			mScroll.removeAllViews();			mScroll.addView(mActivityManager.startActivity("",					new Intent(this, ActivityTest1.class)).getDecorView());			break;		case R.id.btnModule2:			mScroll.removeAllViews();			mScroll.addView(mActivityManager.startActivity("",					new Intent(this, ActivityTest2.class)).getDecorView());			break;		case R.id.btnModule3:			break;		}	}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><LinearLayout android:gravity="center_horizontal"        android:background="#fc9999" android:layout_width="fill_parent"        android:layout_height="wrap_content">        <TextView android:id="@+id/cust_title" android:textColor="@android:color/white"            android:textSize="28sp" android:text="ActivityGroup" android:layout_width="wrap_content"            android:layout_height="wrap_content"></TextView>    </LinearLayout>    <!-- 中间动态加载View -->    <ScrollView android:measureAllChildren="true" android:id="@+id/containerBody"        android:layout_weight="1" android:layout_height="fill_parent"        android:layout_width="fill_parent">    </ScrollView>    <LinearLayout android:background="@android:color/black"        android:layout_gravity="bottom" android:orientation="horizontal"        android:layout_width="fill_parent" android:layout_height="wrap_content">        <!-- 功能模块按钮1 -->        <ImageView android:id="@+id/btnModule1" android:src="@android:drawable/ic_dialog_dialer"            android:layout_marginLeft="7dp" android:layout_marginTop="3dp"            android:layout_marginBottom="3dp" android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <!-- 功能模块按钮2 -->        <ImageView android:id="@+id/btnModule2" android:src="@android:drawable/ic_dialog_info"            android:layout_marginLeft="7dp" android:layout_marginTop="3dp"            android:layout_marginBottom="3dp" android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <!-- 功能模块按钮3 -->        <ImageView android:id="@+id/btnModule3" android:src="@android:drawable/ic_dialog_alert"            android:layout_marginLeft="7dp" android:layout_marginTop="3dp"            android:layout_marginBottom="3dp" android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout></LinearLayout>