button在底部的多个view切换优化之<实例二3D切换>

在button在底部的多个view切换<实例二3D切换> 代码结构不甚合理，也不利于实现我后面计划实现的另外一个功能，先这里抛砖引玉一下--及通过touch屏幕，也可以实现3D切换。经过考虑之后，决定将代码重构为：
1.将View的操作借助一个单实例的MainViewmanager分离开来；
2.实现真正意义上的MVC；
3.继续使用原来的索引也即表驱动的方式来管理view的添加和删除等；

在重构之后，感觉代码的结构更简洁清晰，希望大家指点批评，下面贴上重构之后的代码：
MainActivity.java:
view plain
package com.isomobile.widgets;

import android.app.ActivityGroup;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends ActivityGroup implements View.OnClickListener {
    private int mCurId = 0;
    private MainViewManager mViewManager;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mViewManager = MainViewManager.getInstance();
        mViewManager.setupViews(this);
    }

    @Override
    public void onClick(View v) {
        final int id = v.getId();
        if (mCurId == id) {
            return;
        }
        mCurId = id;
        mViewManager.processViews(this, id);
        mViewManager.onRotateAnimation(mViewManager.getCurButtonIndex(id));
    }
}

MainViewManager.java:
view plain
package com.isomobile.widgets;

import android.app.Activity;
import android.app.ActivityGroup;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.widget.Button;
import android.widget.RelativeLayout;

public class MainViewManager {
    public static String EXTRA_NAME_BUTTON_INDEX = "buton.index";

    public final static Class<?>[] sActivityClasses = {
            Activity1.class, Activity2.class, Activity3.class, Activity4.class, Activity5.class
    };

    public final static int[] sResIds = {
            R.id.btn1, R.id.btn2, R.id.btn3, R.id.btn4, R.id.btn5
    };

    public final static String[] sActivityIds = {
            "Activity1", "Activity2", "Activity3", "Activity4", "Activity5"
    };

    private final static int DISTENCE_X = 240, DISTENCE_Y = 0;

    private final static int ROTATE_ANIMATION_DURATION = 300;

    private int mPreBtnPos, mCurBtnPos = 0;

    private RelativeLayout mViewContainer;

    private View mPreView;

    private View[] mCurView = new View[sResIds.length];

    private Button[] mBtns = new Button[sResIds.length];

    private static MainViewManager mInstance = new MainViewManager();

    private MainViewManager() {
    }

    public static MainViewManager getInstance() {
        return mInstance;
    }

    public void setupViews(Context context) {
        mViewContainer = (RelativeLayout) ((Activity) context).findViewById(R.id.container);
        final Button[] btns = mBtns;
        for (int i = 0; i < btns.length; i++) {
            btns[i] = (Button) ((Activity) context).findViewById(sResIds[i]);
            btns[i].setOnClickListener((OnClickListener) context);
        }

        // 第一次启动时，默认跳转到第一个activity
        mCurView[0] = ((ActivityGroup) context).getLocalActivityManager().startActivity(
                sActivityIds[0],
                new Intent(context, sActivityClasses[0]).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
                .getDecorView();
        mViewContainer.addView(mCurView[0]);
        mPreView = mCurView[0];
        mPreBtnPos = 0;
    }

    public int getCurButtonIndex(int rid) {
        final int length = sResIds.length;
        for (int i = 0; i < length; i++) {
            if (rid == sResIds[i]) {
                return i;
            }
        }
        return 0;
    }

    public void processViews(Context context, int rid) {
        mViewContainer.removeAllViews();
        mCurBtnPos = getCurButtonIndex(rid);
        final Intent intent = new Intent(context, sActivityClasses[mCurBtnPos]);
        intent.putExtra(EXTRA_NAME_BUTTON_INDEX, mCurBtnPos);
        intent.addFlags(Intent.

补充：移动开发 , Android ,