【Android Demo】图片之画廊效果(Gallery Switcher)

 

1.介绍
通过Gallery和ImageSwitcher结合的结果，上面的是ImageSwitcher，下面的是Gallery，通过滑动Gallery内的图片或单击图片，即可带动ImageSwitcher图片的跳转！

2.效果图

 

3.XML文件

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent" android:layout_height="fill_parent">

    <ImageSwitcher android:id="@+id/imageSwitcher"

        android:layout_width="wrap_content" android:layout_height="wrap_content"

        android:layout_centerInParent="true" />



    <Gallery android:id="@+id/gallery" android:background="#55000000"

        android:layout_width="fill_parent" android:layout_height="wrap_content"

        android:layout_alignParentBottom="true" android:spacing="10dp" />

</RelativeLayout>

 

4.Java代码

package wei.ye.g1;



import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.BaseAdapter;

import android.widget.Gallery;

import android.widget.ImageSwitcher;

import android.widget.ImageView;

import android.widget.ViewSwitcher.ViewFactory;



public class Hualang extends Activity {

    // 显示图片的资源

    private static int[] images = { R.drawable.baos, R.drawable.caoc,

            R.drawable.chenyj, R.drawable.chenyy, R.drawable.gouj,

            R.drawable.guany, R.drawable.hanx, R.drawable.lp, R.drawable.liub,

            R.drawable.qinq, R.drawable.tiemz, R.drawable.wus,

            R.drawable.xiangy, R.drawable.yuef, R.drawable.zhaoky,

            R.drawable.zhugl, R.drawable.xis, R.drawable.yingz };

    Gallery gallery;

    ImageSwitcher is;



    @Override

    protected void onCreate(Bundle savedInstanceState) {



        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.hualang);

        setTitle("这是Gallery和ImageSwitcher的效果");

        gallery = (Gallery) findViewById(R.id.gallery);

        is = (ImageSwitcher) findViewById(R.id.imageSwitcher);

        gallery.setAdapter(new ImageAdapter(this));

        // 让选定的图片在中心显示

        gallery.setSelection(images.length / 2);

        // 为Gallery绑定监听器；

        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> parent, View view,

                    int position, long id) {

                // 当在Gallery中选定一张图片是 ImageSwitcher同步显示同一张

                // position%images.length 为了让图片循环显示

                is.setImageResource(images[position % images.length]);



            }



            public void onNothingSelected(AdapterView<?> parent) {



            }

        });



        is.setFactory(new ImageFactory(this));



    }



    private class ImageAdapter extends BaseAdapter {

        private Context context;



        public ImageAdapter(Context context) {

            this.context = context;

        }



        // 可以return images.lenght(),在这里返回Integer.MAX_VALUE

        // 是为了使图片循环显示

        public int getCount() {

            return Integer.MAX_VALUE;

        }



        public Object getItem(int position) {

            return null;

        }



        public long getItemId(int position) {

            return 0;

        }



        public View getView(int position, View convertView, ViewGroup parent) {

            ImageView iv = new ImageView(context);

            iv.setImageResource(images[position % images.length]);

            iv.setLayoutParams(new Gallery.LayoutParams(90, 90));

            iv.setAdjustViewBounds(true);

            return iv;

        }

    }



    private class ImageFactory implements ViewFactory {

        private Context context;



        public ImageFactory(Context context) {

            this.context = context;

        }



        public View makeView() {

            ImageView iv = new ImageView(context);

            iv.setLayoutParams(new ImageSwitcher.LayoutParams(200, 200));

            return iv;

        }

    }

}

 

PS:图片是读取drawable文件里的，不是SD卡里的