无限轮播 viewpager

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package com.lbs.rikao13;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.RadioButton;import android.widget.RadioGroup;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends AppCompatActivity {    int[] tu = {R.drawable.b, R.drawable.c, R.drawable.d};    private ViewPager vp;    Handler handler = new Handler() {        int i = 0;        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            vp.setCurrentItem(i % tu.length);            i++;        }    };    private RadioGroup rg;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        vp = findViewById(R.id.vp);        rg = findViewById(R.id.rg);        mypageada mp = new mypageada();        vp.setAdapter(mp);        timerdingshi();        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                switch (position) {                    case 0:                        RadioButton rb1 = (RadioButton) findViewById(R.id.rb1);                        rb1.setChecked(true);                        break;                    case 1:                        RadioButton rb2 = (RadioButton) findViewById(R.id.rb2);                        rb2.setChecked(true);                        break;                    case 2:                        RadioButton rb3 = (RadioButton) findViewById(R.id.rb3);                        rb3.setChecked(true);                        break;                }            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }    private void timerdingshi() {        Timer timer = new Timer();        timer.schedule(new TimerTask() {            @Override            public void run() {                handler.sendEmptyMessage(1);            }        }, 0, 1000);    }    class mypageada extends PagerAdapter {        @Override        public int getCount() {            return tu.length;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            ImageView iv = new ImageView(MainActivity.this);            iv.setImageResource(tu[position]);            container.addView(iv);            return iv;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView((View) object);        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view == object;        }    }}<?xml version="1.0" encoding="utf-8"?><LinearLayout    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"    android:orientation="vertical"    tools:context="com.lbs.rikao13.MainActivity">    <android.support.v4.view.ViewPager        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_weight="1"        android:id="@+id/vp"        />    <RadioGroup        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:id="@+id/rg">        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/rb1"/>        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/rb2"/>        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/rb3"/>    </RadioGroup></LinearLayout>
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