Android使用gallery和imageSwitch制作可左右循环滑动的图片浏览器

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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