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));    }        }

实例下载>>>>>>>>

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