GridViewActivity gridview显示时的动画

package com.duguang.baseanimation.ui.listivew.listviews;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.support.v4.util.LruCache;import android.support.v7.app.ActionBarActivity;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.GridView;import android.widget.ImageView;import com.duguang.baseanimation.R;import com.duguang.baseanimation.ui.base.BaseActivity;import com.haarman.listviewanimations.ArrayAdapter;import com.haarman.listviewanimations.swinginadapters.prepared.AlphaInAnimationAdapter;public class GridViewActivity extends BaseActivity {   @Override   public void setView() {      setContentView(R.layout.activity_listviews_gridview);      GridView gridView = (GridView) findViewById(R.id.activity_gridview_gv);      AlphaInAnimationAdapter alphaInAnimationAdapter =            new AlphaInAnimationAdapter(new MyAdapter(this, getItems()));      alphaInAnimationAdapter.setAbsListView(gridView);      gridView.setAdapter(alphaInAnimationAdapter);//    getSupportActionBar().setDisplayHomeAsUpEnabled(true);         }   @Override   public void initView() {      // TODO Auto-generated method stub         }   @Override   public void setListener() {      // TODO Auto-generated method stub         }   private ArrayList<Integer> getItems() {      ArrayList<Integer> items = new ArrayList<Integer>();      for (int i = 0; i < 100; i++) {         items.add(i);      }      return items;   }   private static class MyAdapter extends ArrayAdapter<Integer> {      private Context mContext;      private LruCache<Integer, Bitmap> mMemoryCache;      public MyAdapter(Context context, List<Integer> list) {         super(list);         mContext = context;         final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);         // Use 1/8th of the available memory for this memory cache.         final int cacheSize = maxMemory;         mMemoryCache = new LruCache<Integer, Bitmap>(cacheSize) {            @Override            protected int sizeOf(Integer key, Bitmap bitmap) {               // The cache size will be measured in kilobytes rather than               // number of items.               return bitmap.getRowBytes() * bitmap.getHeight() / 1024;            }         };      }      @Override      public View getView(int position, View convertView, ViewGroup viewGroup) {         ImageView imageView = (ImageView) convertView;         if (imageView == null) {            imageView = new ImageView(mContext);            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);         }         int imageResId;         switch (getItem(position) % 5) {         case 0:            imageResId = R.drawable.img_nature1;            break;         case 1:            imageResId = R.drawable.img_nature2;            break;         case 2:            imageResId = R.drawable.img_nature3;            break;         case 3:            imageResId = R.drawable.img_nature4;            break;         default:            imageResId = R.drawable.img_nature5;         }         Bitmap bitmap = getBitmapFromMemCache(imageResId);         if (bitmap == null) {            bitmap = BitmapFactory.decodeResource(mContext.getResources(), imageResId);            addBitmapToMemoryCache(imageResId, bitmap);         }         imageView.setImageBitmap(bitmap);         return imageView;      }      private void addBitmapToMemoryCache(int key, Bitmap bitmap) {         if (getBitmapFromMemCache(key) == null) {            mMemoryCache.put(key, bitmap);         }      }      private Bitmap getBitmapFromMemCache(int key) {         return mMemoryCache.get(key);      }   }   @Override   public boolean onOptionsItemSelected(MenuItem item) {      switch (item.getItemId()) {      case android.R.id.home:         finish();         return true;      default:         return super.onOptionsItemSelected(item);      }   }}