使用jazzyViewPager 加载assets目录打造炫酷效果

MainActivity

package com.need88.drawableround;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import android.app.Activity;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.view.LayoutInflater;

import com.jfeinstein.jazzyviewpager.JazzyViewPager;
import com.jfeinstein.jazzyviewpager.JazzyViewPager.TransitionEffect;

public class MainActivity extends Activity {

    private JazzyViewPager jazzyViewPager;
    private LayoutInflater inflater;
    private ArrayList<Bitmap> bms;
    private String[] picNamelist;
    private BitmapFactory bitmapFactory;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//      自定义Drawable 圆角图片 
//      Bitmap bitmap  =  BitmapFactory.decodeResource(getResources(), R.drawable.a);
//      RoundImageDrawable drawable = new RoundImageDrawable(bitmap);
        initView();
        initDate();

        /**
         * 添加动画效果，可以设置很多动画效果。如：
         * Standard
         * Tablet
         * CubeIn
         * CubeOut
         * FlipVertical
         * FlipHorizontal
         * Stack
         * ZoomIn
         * ZoomOut
         * RotateUp
         * RotateDown
         * Accordion
         * 
         * 下面是可以通过字符串来产生动画对象的例子：
         * TransitionEffect effect = TransitionEffect.valueOf("Tablet");
         * setupJazziness(effect);
         */

        jazzyViewPager .setTransitionEffect(TransitionEffect.CubeOut);

        jazzyViewPager.setPageMargin(40);//两个页面之间的间距 
        jazzyViewPager.setFadeEnabled(true);//淡入浅出 效果 
        jazzyViewPager.setAdapter(new MyAdapter(this, bms,jazzyViewPager));
        jazzyViewPager.setOnPageChangeListener(null);//可以监听page的改变

    }


    private void initDate() {
        bitmapFactory = new BitmapFactory();
        bms = new ArrayList<Bitmap>();
        AssetManager assetManager = getAssets();
        Bitmap  bitmap;
        try {
            picNamelist = assetManager.list("");

            for(String picName:picNamelist){
                InputStream is = assetManager.open(picName);
                bitmap = bitmapFactory.decodeStream(is);
                bitmap = zoomImage(bitmap, 500, 500);

                bms.add(bitmap);
            }


        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }


    private void initView() {
        inflater = getLayoutInflater();
        jazzyViewPager = (JazzyViewPager) findViewById(R.id.jazzyViewPager);

    }


    public static Bitmap zoomImage(Bitmap bgimage, double newWidth, 
            double newHeight) { 
    // 获取这个图片的宽和高 
    float width = bgimage.getWidth(); 
    float height = bgimage.getHeight(); 
    // 创建操作图片用的matrix对象 
    Matrix matrix = new Matrix(); 
    // 计算宽高缩放率 
    float scaleWidth = ((float) newWidth) / width; 
    float scaleHeight = ((float) newHeight) / height; 
    // 缩放图片动作 
    matrix.postScale(scaleWidth, scaleHeight); 
    Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, (int) width, 
                    (int) height, matrix, true); 
    return bitmap; 
} 


}

MyAdapter

* 注意mJazzyViewPager.setObjectForPosition(view, position); 一定要加上，否则不会出现效果，其他和普通ViewPager写法一致 *

package com.need88.drawableround;

import java.util.ArrayList;

import com.jfeinstein.jazzyviewpager.JazzyViewPager;

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class MyAdapter extends PagerAdapter{

    private Context mContext;
    private ArrayList<Bitmap> bitmaps;
    private JazzyViewPager mJazzyViewPager;
    public MyAdapter(Context context,ArrayList<Bitmap> bms,JazzyViewPager viewPager){
        this.mContext = context;
        this.bitmaps = bms;
        this.mJazzyViewPager = viewPager;
    }


    @Override
    public int getCount() {

        return Integer.MAX_VALUE;
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        /**
         * true: 表示不去创建，使用缓存  false:去重新创建
         * view： 当前滑动的view
         * object：将要进入的新创建的view，由instantiateItem方法创建
         */

        return arg0 == arg1;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        View view = View.inflate(mContext, R.layout.list_item, null);
        ImageView imageView = (ImageView) view.findViewById(R.id.image);
        imageView.setImageBitmap(bitmaps.get(position%bitmaps.size())); //

        container.addView(view);  //一定不能少，将view加入到viewPager中


        //=============================== 实现效果重点 
         //这句话必须要写，按不同的位置添加视图
        mJazzyViewPager.setObjectForPosition(view, position);   
        return view;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }


}

布局

activity_main.xml

<LinearLayout
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

<com.jfeinstein.jazzyviewpager.JazzyViewPager
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/jazzyViewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</com.jfeinstein.jazzyviewpager.JazzyViewPager>
</LinearLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView 
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="fitXY"
        android:src="@drawable/a"/>


</LinearLayout>

asset目录下面放置的图片由于过大，注意压缩一下，否则容易出现 内存溢出