效果图：

为了使图片浏览器左右无限循环滑动 我们要自定义gallery的adapter

如果要想自定义adapter首先要了解这几个方法

@Override public int getCount() { // TODO Auto-generated method stub return 0; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub return null; }

其中getCount方法 是返回数据源的数量

getItem方法 返回的是一个object对象 也就是返回目前容器中数据ID position所对应的对象

getItemId 返回目前容器中的数据ID

getView取得目前要显示的View

如果要实现左右循环滑动 首先我们要返回数据源的数量为最大值 然后把所有数据的ID对原本数据源的数量取余 最后设置gallery初始的位置在0-最大值的中间即可

更改后的adapter就是这样

package com.example.imageswitcher; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.ImageView.ScaleType; public class MyAdapter extends BaseAdapter{ private int id_image[]; private Context contex; public MyAdapter(Context contex,int id_image[]) { this.contex=contex; this.id_image=id_image; } @Override public int getCount() { // TODO Auto-generated method stub return Integer.MAX_VALUE; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return id_image[position%id_image.length]; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position%id_image.length; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ImageView imageView=new ImageView(contex); imageView.setBackgroundResource(id_image[position%id_image.length]); imageView.setLayoutParams(new Gallery.LayoutParams(250, 200)); imageView.setScaleType(ScaleType.FIT_XY); return imageView; } }

MainActivity

package com.example.imageswitcher; import android.os.Bundle; import android.app.Activity; import android.view.LayoutInflater.Factory; import android.view.Menu; import android.view.View; import android.view.Window; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ImageView.ScaleType; import android.widget.ViewSwitcher.ViewFactory; public class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory{ private ImageSwitcher imageSwitcher; private Gallery gallery; private int id_image[] = { R.drawable.beauty1, R.drawable.beauty2, R.drawable.beauty3, R.drawable.beauty4, R.drawable.beauty5, R.drawable.beauty6, R.drawable.beauty7, R.drawable.beauty8, R.drawable.beauty9}; private MyAdapter myAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); gallery = (Gallery) findViewById(R.id.id_gallery); imageSwitcher = (ImageSwitcher) findViewById(R.id.id_imageSwitcher); myAdapter=new MyAdapter(this, id_image); imageSwitcher.setFactory(this); gallery.setOnItemSelectedListener(this); //设置淡入淡出效果 imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); gallery.setAdapter(myAdapter); //一定不要忘记 设置gallery的初始位置为中间即可 gallery.setSelection(id_image.length*100); } @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub imageSwitcher.setBackgroundResource(id_image[position%id_image.length]); } @Override public void onNothingSelected(AdapterView<?> parent) { // TODO Auto-generated method stub } @Override public View makeView() { // TODO Auto-generated method stub ImageView image=new ImageView(this); image.setScaleType(ScaleType.FIT_CENTER); return image; } }

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