ImageSwitcher控件

转载: http://www.cnblogs.com/webabcd/archive/2010/01/27/1657171.html
ImageSwitcher用于图片显示

如图:

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

    <Gallery android:id="@+id/gallery" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:spacing="20px" />

    <!--
        ImageSwitcher - 图片转换器控件（改变图片时增加一些动画效果）
    -->
    <ImageSwitcher android:id="@+id/imageSwitcher"
        android:layout_width="fill_parent" android:layout_height="wrap_content" />

</LinearLayout>

package com.imageswitcher;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;
import android.widget.Gallery.LayoutParams;

// 图片转换器的使用基本同文字转换器
// 以下是一个用 ImageSwitcher + Gallery 实现的经典的图片浏览器的 Demo
public class ImageswitcherActivity extends Activity implements
        ViewSwitcher.ViewFactory {

    private ImageSwitcher mSwitcher;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main);

        setTitle("ImageSwithcer");

        mSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
        mSwitcher.setFactory(this);
        mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));
        mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));

        Gallery gallery = (Gallery) findViewById(R.id.gallery);
        gallery.setAdapter(new ImageAdapter(this));
        gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View v,
                    int position, long id) {
                mSwitcher.setImageResource(mImageIds[position]);
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {

            }
        });
    }

    public class ImageAdapter extends BaseAdapter {

        private Context mContext;

        public ImageAdapter(Context context) {
            mContext = context;
        }

        public int getCount() {
            return mThumbIds.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView image = new ImageView(mContext);

            image.setImageResource(mThumbIds[position]);
            image.setAdjustViewBounds(true);
            image.setLayoutParams(new Gallery.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

            return image;
        }
    }

    private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03};

    private Integer[] mImageIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03};

    @Override
    public View makeView() {
        ImageView image = new ImageView(this);
        image.setMinimumHeight(200);
        image.setMinimumWidth(200);
        image.setScaleType(ImageView.ScaleType.FIT_CENTER);
        image.setLayoutParams(new ImageSwitcher.LayoutParams(
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        return image;
    }
}