纯碎的轮播

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" tools:context="com.example.b_week3.MainActivity">
    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:id="@+id/pager"></android.support.v4.view.ViewPager>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/ll"
        android:orientation="vertical">

        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/rg"
            android:orientation="horizontal"
            android:gravity="center"
            android:layout_marginTop="50dp">
            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/rb1"
                android:checked="true"/>

            <RadioButton
                android:id="@+id/rb2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/rb3"/>
        </RadioGroup>
    </LinearLayout>


</RelativeLayout>

public class MainActivity extends AppCompatActivity {
    private List<String > imagelist=new ArrayList<String>();
    private ViewPager pager;

    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            int what=msg.what;
            pager.setCurrentItem(what);
        }
    };
    private RadioGroup rg;
    private int con=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pager = (ViewPager) findViewById(R.id.pager);
        rg = (RadioGroup) findViewById(R.id.rg);
        imagelist.add("http://cdn.duitang.com/uploads/blog/201308/18/20130818150526_Ru2Bk.thumb.600_0.png");
        imagelist.add("http://www.bkill.com/u/info_img/2012-09/02/2012083116140522302.jpg");
        imagelist.add("http://www.it165.net/uploadfile/2011/1218/20111218070928328.jpg");

        pager.setAdapter(new My());
        jian();
        new Thread(){
            @Override
            public void run() {
                while(true) {
                    try {
                        Thread.sleep(1000);
                        con++;
                        handler.sendEmptyMessage(con);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }
    class My extends PagerAdapter {

        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view==object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImageView imageView=new ImageView(MainActivity.this);
            ImageLoader.getInstance().displayImage(imagelist.get(position%imagelist.size()),imageView,appliction.getImageOptions());
            container.addView(imageView);
            return imageView;
        }

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

            container.removeView((View) object);
        }
    }
    public void jian(){
        pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                switch (position%imagelist.size()){
                    case 0:
                        rg.check(R.id.rb1);
                        break;
                    case 1:
                        rg.check(R.id.rb2);
                        break;
                    case 2:
                        rg.check(R.id.rb3);
                        break;
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
                switch (checkedId%imagelist.size()){
                    case R.id.rb1:
                        pager.setCurrentItem(0);
                        break;
                    case R.id.rb2:
                        pager.setCurrentItem(1);
                        break;
                    case R.id.rb3:
                        pager.setCurrentItem(2);
                        break;
                }
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.lunbo">
<uses-permission android:name="android.permission.INTERNET"/>
    <application android:allowBackup="true" android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true" android:theme="@style/AppTheme"
        android:name=".appliction">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>