[android] 切换界面的问题

    /**
     * 初始化主体
     */
    public void initMiddle() {
        mainContainer=(RelativeLayout) findViewById(R.id.il_main);
        MiddleManager.getInstance().setMainContainer(mainContainer);
        MiddleManager.getInstance().loadView(LoginView.class);
    }

package com.tsh.lottery.views;

import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.RelativeLayout;

import com.tsh.lottery.R;

public class MiddleManager {
    private RelativeLayout mainContainer;
    //单例
    private static MiddleManager manager=new MiddleManager();
    private MiddleManager(){};
    public static MiddleManager getInstance(){
        return manager;
    }
    public void setMainContainer(RelativeLayout mainContainer) {
        this.mainContainer = mainContainer;
    }
    //界面缓存
    private Map<String,BaseView> VIEWCACHE=new HashMap<String,BaseView>();
    //当前界面
    private BaseView currentView;
    /**
     * 加载界面
     */
    public void loadView(Class<? extends BaseView> baseViewClass) {
        
        BaseView baseView=null;
        //判断是否存在
        String key=baseViewClass.getSimpleName();
        if(VIEWCACHE.containsKey(key)){
            baseView=VIEWCACHE.get(key);
        }else{
            try {
                Constructor<? extends BaseView> constructor;
                constructor = baseViewClass.getConstructor(Context.class);
                baseView=constructor.newInstance(mainContainer.getContext());
            } catch (Exception e) {
                e.printStackTrace();
            }
            VIEWCACHE.put(key, baseView);
        }
        mainContainer.removeAllViews();
//        if(currentView!=null){
//            SlideUtil.slideOut(currentView.getView(), 2000);
//        }
        
        View child=baseView.getView();
        mainContainer.addView(child);
        //SlideUtil.slideIn(child, 2000);
        child.startAnimation(AnimationUtils.loadAnimation(mainContainer.getContext(), R.anim.left_to_right));
        currentView=baseView;
    }
}

package com.tsh.lottery.views;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;
/**
 * 会员界面
 * @author taoshihan
 *
 */
public class IndexView extends BaseView{
    private TextView textView;
    /**
     * 构造函数
     * 经过之前的处理，这个构造函数只会执行一次
     * @param context
     */
    public IndexView(Context context) {
        super(context);
        initView();
    }
    /**
     * 初始化界面
     */
    private void initView() {
        textView=new TextView(context);
        LayoutParams params=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
        textView.setLayoutParams(params);
        textView.setText("我是会员界面");
    }
    @Override
    public View getView() {
        return textView;
    }
}