最近也在一点点学习，还是老样子，把新学的知识总结一下，方便以后参考用。
现在大多Android入门教程中，都给大家教了gallery的基本用法，浏览图片时大小一样，比较死板。咱们这里稍微加一点点效果：选中放大。
其实也非常简单，就是在适配器中public View getView(int position, View convertView, ViewGroup parent) {}这个抽象方法中做相应处理即可：选中的设置大一点，未选中的设置小一点！
效果实现如下：
闲话少说，贴代码：
galleryAdapter.java
package com.contacts; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; public class galleryAdapter extends BaseAdapter{ Context mContext; private int selectItem; private int drawable1[]=new int[] {R.drawable.center,R.drawable.left,R.drawable.right}; public galleryAdapter(Context mContext){ this.mContext=mContext; } @Override public int getCount() { // TODO Auto-generated method stub return Integer.MAX_VALUE; //这里的目的是可以让图片循环浏览 } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } public void setSelectItem(int selectItem) { if (this.selectItem != selectItem) { this.selectItem = selectItem; notifyDataSetChanged(); } } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ImageView imageView=new ImageView(mContext); imageView.setImageResource(drawable1[position%drawable1.length]); //取余，让图片循环浏览 if(selectItem==position){ Animation animation = AnimationUtils.loadAnimation(mContext, R.anim.my_scale_action); //实现动画效果 imageView.setLayoutParams(new Gallery.LayoutParams(105,120)); imageView.startAnimation(animation); //选中时，这是设置的比较大 } else{ imageView.setLayoutParams(new Gallery.LayoutParams(75,90)); //未选中 } return imageView; } }
ContactsActivity.java