Android开发之ViewPager图片无限轮播

主代码:

public class Showactivity extends Activity implements OnPageChangeListener {

    private List<Jsonimage> listimage;
    private ViewPager vpager;
    private LinearLayout llayout;
    private int count = 0;
    private BitmapUtils bitmapUtils;
    private List<ImageView> imagelist;
    private int lastindex = 0;
    @SuppressLint("HandlerLeak")
    Handler h = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            vpager.setCurrentItem(count);
        }
    };

    @SuppressWarnings("unchecked")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.showactivity);

        vpager = (ViewPager) findViewById(R.id.viewpager);
        llayout = (LinearLayout) findViewById(R.id.ll_layout);
        bitmapUtils = new BitmapUtils(getApplicationContext());
        imagelist = new ArrayList<ImageView>();
        Intent intent = getIntent();
        listimage = (List<Jsonimage>) intent.getSerializableExtra("ls");
        // Log.i("TAG", listimage.toString());

        for (int i = 0; i < listimage.size(); i++) {
            ImageView imageView = new ImageView(getApplicationContext());
            bitmapUtils.display(imageView, listimage.get(i).getHead_img());
            imagelist.add(imageView);

            ImageView imageView2 = new ImageView(getApplicationContext());
            imageView2.setBackgroundResource(R.drawable.shape);
            LayoutParams layoutParams = new LinearLayout.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

            layoutParams.leftMargin = 15;

            imageView2.setLayoutParams(layoutParams);

            llayout.addView(imageView2);

            if (i == 0) {
                imageView2.setEnabled(true);

            } else {
                imageView2.setEnabled(false);
            }

        }

        vpager.setAdapter(new Mypageadapter(getApplicationContext(), imagelist));

        Timer t = new Timer();
        t.schedule(new TimerTask() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                count++;
                if (count == listimage.size()) {
                    count = 0;
                }
                h.sendEmptyMessage(0);
            }
        }, 1000, 1000);
        vpager.setOnPageChangeListener(this);

    }

    @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
    public void onPageSelected(int arg0) {
        // TODO Auto-generated method stub
        int index = arg0 % imagelist.size();
        // 将当前指示灯改为true
        llayout.getChildAt(index).setEnabled(true);
        llayout.getChildAt(lastindex).setEnabled(false);
        lastindex = index;
    }
}

自定义PagerAdapter:

public class Mypageadapter extends PagerAdapter {
    Context context;
    List<ImageView> list;

    public Mypageadapter(Context context, List<ImageView> list) {
        super();
        this.context = context;
        this.list = list;
    }

    // 得到图片的数量
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return list.size();
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        // TODO Auto-generated method stub
        return (arg0 == arg1);
    }

    // 将图片添加到View
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(list.get(position));
        return list.get(position);
    }

    // 销毁
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // 销毁对应位置上的Object
        // super.destroyItem(container, position, object);
        container.removeView(list.get(position));
    }
}

　

在res中创建drawble文件

dot_focus.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="oval">
   <size android:width="10dp" android:height="10dp"/>
    <solid android:color="#FF0000"/>
</shape>

dot_nomal.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" >

    <size
        android:height="10dp"
        android:width="10dp" />

    <solid android:color="#808080" />

</shape>


shape.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/dot_focus" android:state_enabled="true"></item>
    <item android:drawable="@drawable/dot_nomal" android:state_enabled="false"></item>

</selector>

XML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="match_parent"
    android:orientation="vertical" >
    
      <LinearLayout
        android:id="@+id/ll_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_margin="5dp" >
    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/ll_layout" >
    </android.support.v4.view.ViewPager>
</RelativeLayout>