content: /*
   * Copyright 2013 Niek Haarman
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.example.listviewanimationdemo.itemanimation;
  
  import java.util.ArrayList;
  
  import android.content.Context;
  import android.content.Intent;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.os.Bundle;
  import android.support.v4.app.FragmentActivity;
  import android.support.v4.util.LruCache;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.AbsListView;
  import android.widget.ImageView;
  import android.widget.ListView;
  import android.widget.TextView;
  
  import com.example.listviewanimationdemo.R;
  import com.nhaarman.listviewanimations.ArrayAdapter;
  import com.nhaarman.listviewanimations.itemmanipulation.OnDismissCallback;
  import com.nhaarman.listviewanimations.itemmanipulation.swipedismiss.SwipeDismissAdapter;
  import com.nhaarman.listviewanimations.swinginadapters.prepared.SwingBottomInAnimationAdapter;
  
  public class GoogleCardsActivity extends FragmentActivity implements OnDismissCallback {
  
  	private GoogleCardsAdapter mGoogleCardsAdapter;
  
  	public static void actionToGoogleCard(Context context){
  		Intent intent =new Intent(context,GoogleCardsActivity.class);
  		context.startActivity(intent);
  	}
  	
  	@Override
  	protected void onCreate(final Bundle savedInstanceState) {
  		super.onCreate(savedInstanceState);
  		setTitle("Google Card");
  		setContentView(R.layout.activity_googlecards);
  
  		ListView listView = (ListView) findViewById(R.id.activity_googlecards_listview);
  
  		mGoogleCardsAdapter = new GoogleCardsAdapter(this);
  		SwingBottomInAnimationAdapter swingBottomInAnimationAdapter = new SwingBottomInAnimationAdapter(new SwipeDismissAdapter(mGoogleCardsAdapter, this));
  		swingBottomInAnimationAdapter.setInitialDelayMillis(300);
  		swingBottomInAnimationAdapter.setAbsListView(listView);
  
  		listView.setAdapter(swingBottomInAnimationAdapter);
  
  		mGoogleCardsAdapter.addAll(getItems());
  	}
  
  	private ArrayList<Integer> getItems() {
  		ArrayList<Integer> items = new ArrayList<Integer>();
  		for (int i = 0; i < 100; i++) {
  			items.add(i);
  		}
  		return items;
  	}
  
  	@Override
  	public void onDismiss(final AbsListView listView, final int[] reverseSortedPositions) {
  		for (int position : reverseSortedPositions) {
  			mGoogleCardsAdapter.remove(position);
  		}
  	}
  
  	private static class GoogleCardsAdapter extends ArrayAdapter<Integer> {
  
  		private final Context mContext;
  		private final LruCache<Integer, Bitmap> mMemoryCache;
  
  		public GoogleCardsAdapter(final Context context) {
  			mContext = context;
  
  			final int cacheSize = (int) (Runtime.getRuntime().maxMemory() / 1024);
  			mMemoryCache = new LruCache<Integer, Bitmap>(cacheSize) {
  				@Override
  				protected int sizeOf(final Integer key, final 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(final int position, final View convertView, final ViewGroup parent) {
  			ViewHolder viewHolder;
  			View view = convertView;
  			if (view == null) {
  				view = LayoutInflater.from(mContext).inflate(R.layout.activity_googlecards_card, parent, false);
  
  				viewHolder = new ViewHolder();
  				viewHolder.textView = (TextView) view.findViewById(R.id.activity_googlecards_card_textview);
  				view.setTag(viewHolder);
  
  				viewHolder.imageView = (ImageView) view.findViewById(R.id.activity_googlecards_card_imageview);
  			} else {
  				viewHolder = (ViewHolder) view.getTag();
  			}
  
  			viewHolder.textView.setText("这是第 " + (getItem(position) + 1)+"个卡片");
  			setImageView(viewHolder, position);
  
  			return view;
  		}
  
  		private void setImageView(final ViewHolder viewHolder, final int position) {
  			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);
  			}
  			viewHolder.imageView.setImageBitmap(bitmap);
  		}
  
  		private void addBitmapToMemoryCache(final int key, final Bitmap bitmap) {
  			if (getBitmapFromMemCache(key) == null) {
  				mMemoryCache.put(key, bitmap);
  			}
  		}
  
  		private Bitmap getBitmapFromMemCache(final int key) {
  			return mMemoryCache.get(key);
  		}
  
  		private static class ViewHolder {
  			TextView textView;
  			ImageView imageView;
  		}
  	}
  }
  