Android：ViewPager制作幻灯片

布局：

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

   

<RelativeLayout 

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

    android:layout_width="match_parent"

    android:layout_height="100dp"

    >

    <android.support.v4.view.ViewPager

    android:id="@+id/viewpager"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_gravity="center"

    >

</android.support.v4.view.ViewPager>

    <LinearLayout 

    android:id="@+id/pointgroup"

    android:layout_width="match_parent"

    android:layout_height="10dp"

    android:orientation="horizontal"

    android:layout_alignParentBottom="true"

    android:layout_marginBottom="5dp"

    android:gravity="center"

    >

    

</LinearLayout>

</RelativeLayout>

程序：

public class MainActivity extends Activity {

    //ViewPager 

        private ViewPager viewpager;    

        //幻灯片图片资源

        private int [] imgArray={R.drawable.view1,R.drawable.view2,R.drawable.view3};

        //图片数组

        private ArrayList<View> viewlist;



        private ImageView imageView;

        //点点

        private ViewGroup pointgroup;

        private ImageView[] pointarr;

        



        @Override

        protected void onCreate(Bundle savedInstanceState) {

            // TODO Auto-generated method stub

            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_viewpage);

            //初始化

            viewpager =(ViewPager) findViewById(R.id.viewpager);

            pointgroup =(ViewGroup) findViewById(R.id.pointgroup);

            viewlist = new ArrayList<View>();

            

            //将图片装载到数组    

            for(int i=0;i<imgArray.length;i++){

                imageView =new ImageView(this);

                //设置图片

                imageView.setBackgroundResource(imgArray[i]);

                //设置图片id

                imageView.setId(imgArray[i]);

                viewlist.add(imageView);

                

            }

            

            /*

             * viewpager加载适配器

             * MyPageAdapter为自定义适配器

             * */

            

            //传递上下文

            Context context = MainActivity.this;

            MyPageAdapter pageadapter2 =new MyPageAdapter(viewlist,context);

            viewpager.setAdapter(pageadapter2);        

            

            

            //点数组

            pointarr=new ImageView[imgArray.length];

            //把点加入布局，和设置点状态

            for(int i=0;i<imgArray.length;i++){

                ImageView point=new ImageView(this);        

                

                //设置点大小

                point.setLayoutParams(new LayoutParams(10,10)); 

                pointarr[i]=point;

                //状态处理

                if(i==0){

                    pointarr[i].setBackgroundResource(R.drawable.viewpage_point_focused);

                }else{

                    pointarr[i].setBackgroundResource(R.drawable.viewpage_point_unfocused);

                }

                //加入到容器

                pointgroup.addView(pointarr[i]);

            }

            

        

            //viewpager设置监听器

            pointChangeListener pointListener=new pointChangeListener();

            viewpager.setOnPageChangeListener(pointListener);

            //点击图片

            

            

            

        }

            

        

        /*

         * viewpage监听器

         */

        

        public class pointChangeListener implements OnPageChangeListener{



            @Override

            public void onPageScrollStateChanged(int arg0) {

                // TODO Auto-generated method stub

                

            }



            @Override

            public void onPageScrolled(int arg0, float arg1, int arg2) {

                // TODO Auto-generated method stub

                

            }



            @Override

            //比如切换到第二张图片，相应索引的点为选择状态，其他为未选中状态

            public void onPageSelected(int arg0) {

                

                // TODO Auto-generated method stub

                for(int i=0;i<pointarr.length;i++){

                    pointarr[arg0].setBackgroundResource(R.drawable.viewpage_point_focused);    

                    if(arg0 !=i){

                    pointarr[i].setBackgroundResource(R.drawable.viewpage_point_unfocused);    

                    }

                }

                

            }

            

            

        }

        



        

    }

自定义适配器：

public class MyPageAdapter extends PagerAdapter {

    private List<View> viewlist;

    private Context context;

    public MyPageAdapter(List<View> viewlist,Context context){

        this.viewlist =viewlist;

        this.context=context;

    }

    

    @Override

    public int getCount() {

        // TODO Auto-generated method stub

        return viewlist.size();

    }



    @Override

    public boolean isViewFromObject(View arg0, Object arg1) {

        // TODO Auto-generated method stub

        return arg0==arg1;

    }

    

    //以下也是必要方法，不过要自己添加

    //实例化

    

    @Override

    public Object instantiateItem(View container, int position) {

        // TODO Auto-generated method stub

        ((ViewPager)container).addView(viewlist.get(position));

        View view =viewlist.get(position);

        view.setOnClickListener(new OnClickListener(){



            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                int i =v.getId();

                String t="你点击了图片的图片id为："+i;

                Toast.makeText(context, t, Toast.LENGTH_LONG).show();

                

                /*跳转页面

                *Intent intent =new Intent(context,NavigationActivity.class);

                *context.startActivity(intent); 

                 */ 

            

            }

            

        });

        return viewlist.get(position);                

    }

     



    //销毁

    @Override

    public void destroyItem(ViewGroup container, int position, Object object) {

        // TODO Auto-generated method stub

        container.removeView(viewlist.get(position));

    }

    

    



}

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