button在底部的多個view切換優化之<實例二3D切換> – Android移動開發技術文章_手機開發 Android移動開發教學課程

在button在底部的多個view切換<實例二3D切換> 代碼結構不甚合理，也不利於實現我後面計劃實現的另外一個功能，先這裡拋磚引玉一下–及通過touch屏幕，也可以實現3D切換。經過考慮之後，決定將代碼重構為：
1.將View的操作借助一個單實例的MainViewmanager分離開來；
2.實現真正意義上的MVC；
3.繼續使用原來的索引也即表驅動的方式來管理view的添加和刪除等；
 
在重構之後，感覺代碼的結構更簡潔清晰，希望大傢指點批評，下面貼上重構之後的代碼：
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); 
        } 
 
        // 第一次啟動時，默認跳轉到第一個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.FLAG_ACTIVITY_CLEAR_TOP); 
        mCurView[mCurBtnPos] = ((ActivityGroup) context).getLocalActivityManager().startActivity( 
                sActivityIds[mCurBtnPos], intent).getDecorView(); 
    } 
 
    public void onRotateAnimation(int index) { 
        if (mPreBtnPos > mCurBtnPos) { 
            Rotate3d.rightRotate(mPreView, mCurView[index], DISTENCE_X, DISTENCE_Y, 
                    ROTATE_ANIMATION_DURATION, new AnimListener()); 
        } else { 
            Rotate3d.leftRotate(mPreView, mCurView[index], DISTENCE_X, DISTENCE_Y, 
                    ROTATE_ANIMATION_DURATION, new AnimListener()); 
        } 
 
        mPreView = mCurView[index]; 
        mViewContainer.removeAllViews(); 
        mViewContainer.addView(mCurView[index]); 
        mPreBtnPos = mCurBtnPos; 
    } 
 
    private final static class AnimListener implements Animation.AnimationListener { 
 
        public void onAnimationEnd(Animation animation) { 
            // 可以設置buttons的背景或者狀態(是否可點擊等) 
        } 
 
        public void onAnimationRepeat(Animation animation) { 
 
        } 
 
        public void onAnimationStart(Animation animation) { 
            // 可以設置buttons的背景或者狀態(是否可點擊等) 
        } 
    } 
} 

作者“androidzhaoxiaogang的專欄”