想要在 viewpager 页面上启动动画，但页面正在预加载

In my projects I have several screen(Fragments) and I want to give animation to the fragments elements(views). I have used view pager and viewpager adapter and fragments. The main problems I am facing-

1. 在开始时正在加载 2 个页面，例如在开始时正在加载第 1 页和第 2 页.如果滑动到第二页，则它会自动加载第 3 页.
2. 我需要显示使用 通用补间引擎.

代码有问题吗?

这是 MainActivity.java 代码-

    public class MainActivity extends FragmentActivity {    
    ViewPager viewPager;
    PagerAdapter adapter;
    CirclePageIndicator mIndicator;
    private int mWidthScreen;
    private int mHeightScreen;
    private Bundle bundle;
    private List<Fragment> frgScreens;
    private int selectedtheme;
    private Handler mHandler = new Handler();


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.viewpager_main); // Get the view from viewpager_main.xml        
        buildargument();        
        initialisePaging(); // Page creating function       
    }

    private void initialisePaging(int theme) {
        viewPager = (ViewPager) findViewById(R.id.pager);       
        frgScreens = new Vector<Fragment>(); // clearing old entries        
        viewPager.setOffscreenPageLimit(0);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                //Loading fragment # position

                //Instead of starting animation from onCreate start it from here 
                //Only for the first time (for page 1) this callback will not trigger
            }

            @Override
            public void onPageSelected(int position) {
            }

            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });

        frgScreens = this.basicThemes();
        // Bind result to ViewPagerAdapter
        adapter = new ViewPagerAdapter(this.getSupportFragmentManager(), frgScreens);
        this.viewPager.setAdapter(adapter);
    }

    /*
     * Basic fragments
     */
    private List<Fragment> basicThemes() {
        // declaring fragments Group Basic
        Fragment frgBasic1 = Fragment.instantiate(this, Basic1.class.getName());
        Fragment frgBasic2 = Fragment.instantiate(this, Basic2.class.getName());
        Fragment frgBasic3 = Fragment.instantiate(this, Basic3.class.getName());
        Fragment frgBasic4 = Fragment.instantiate(this, Basic4.class.getName()); 
        Fragment frgBasic5 = Fragment.instantiate(this, Basic5.class.getName()); 

        // Passing arguments
        frgBasic1.setArguments(bundle);
        frgBasic2.setArguments(bundle);
        frgBasic3.setArguments(bundle);
        frgBasic4.setArguments(bundle); 
        frgBasic5.setArguments(bundle);



        // Loading screens into Fragment list
        List<Fragment> frgBasicScreens = new Vector<Fragment>();

        frgBasicScreens.add(frgBasic1);
        frgBasicScreens.add(frgBasic2);
        frgBasicScreens.add(frgBasic3);
        frgBasicScreens.add(frgBasic4); 
        frgBasicScreens.add(frgBasic5);

    return frgBasicScreens;

}

private void getScreenHeightWidhth() {
    DisplayMetrics localDisplayMetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);
    this.mWidthScreen = localDisplayMetrics.widthPixels;
    this.mHeightScreen = localDisplayMetrics.heightPixels;
    mHandler.post(
            new DisplayToast(this, "Width Screen:" + mWidthScreen + ". Height Screen: " + mHeightScreen + "."));
}

private void buildargument() {
    this.bundle = new Bundle();
    bundle.putInt("mWidthScreen", this.mWidthScreen);
}   

@Override
protected void onResume() {
    super.onResume();
}

@Override
public void onDestroy() {
    super.onDestroy();
}}

现在ViewPagerAdapter.java

public class ViewPagerAdapter extends FragmentPagerAdapter {    
private List<Fragment> screens; 

public ViewPagerAdapter(FragmentManager fm, List<Fragment> fragments ) {
    super(fm);      
    this.screens = fragments;       
}

@Override
public Fragment getItem(int pos) {
    // getting the position of the item
    return this.screens.get(pos);       
}

@Override
public int getCount() {
    // Getting the size of screen passed
    return this.screens.size();
}}

skinbase.java是所有基础屏一些共享方法使用的通用类.

public abstract class SkinsBase extends Fragment
{
 protected int mWidthScreen;
 protected int mHeightScreen;
 public int skinHeight;
 public int skinWidth;
 public final int textShadowSize = 2;
 .................
 }

public class Basic1 extends SkinsBase { 
private RelativeLayout mBlueBackground;
private Handler mHandler = new Handler();
private static final String TAG = "Basic1";

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if (container == null) {
        return null;
    }       
    mContext = container.getContext();
    View v = inflater.inflate(R.layout.blank_viewpager_item, container, false);
    mLayoutForeground = (RelativeLayout) v.findViewById(R.id.relative);

    mBlueBackground = initshape(getResources().getColor(R.color.transparent_blue_80),this.mWidthScreen, (int) (0.10F * this.mWidthScreen), 0,(int) (0.12F *this.mWidthScreen));     
    this.mLayoutForeground.addView(this.mBlueBackground);   

    Log.e(TAG, "Inside basic 1 ");
    return v;
}



public RelativeLayout initshape(int intColor,int intWidthscreen, int intHeight, int intMerginLeft,int intMerginTop) {
    RelativeLayout localRelativeLayout = new RelativeLayout(this.mContext);             
    localRelativeLayout.setBackgroundColor(intColor);       
    RelativeLayout.LayoutParams localLayoutParams = new RelativeLayout.LayoutParams(intWidthscreen, intHeight);
    localLayoutParams.setMargins(intMerginLeft, intMerginTop, 0, 0);
    localRelativeLayout.setLayoutParams(localLayoutParams);         
    return localRelativeLayout;
}   

public void onResume() {
    super.onResume();
}
@Override
public void onPause() {
    super.onPause();
}}

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        //Loading fragment # position

        //Instead of starting animation from onCreate start it from here 
        //Only for the first time (for page 1) this callback will not trigger
    }

    @Override
    public void onPageSelected(int position) {
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});