ViewPager（四）——自动轮播图片

参考并改写自博客：http://blog.csdn.net/lfdfhl/article/details/50900497

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.cctvjiatao.viewpagerdemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="14"        android:targetSdkVersion="21" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

MainActivity.java

package com.cctvjiatao.viewpagerdemo;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.view.ViewPager;import android.view.ViewGroup;import android.view.Window;import android.view.WindowManager;import android.widget.ImageView;import android.widget.LinearLayout;/** * @作者： jiatao * @修改时间：2016-4-14 下午11:18:27 * @文件名：MainActivity.java * @版权声明：www.cctvjiatao.com * @功能： ViewPager的自动轮播 ,同时支持手动切换ViewPager的Item */public class MainActivity extends Activity {private Context mContext;private Handler mHandler;private Runnable mRunnable;private ViewPager mViewPager;private ImageView[] dotImageViews;private final int INTERVAL = 1000 * 3;private LinearLayout mDotsLinearLayout;private final static int SET_VIEWPAGER_ITEM = 9527;private StartPagerAdapter mViewPagerAdapter;private PageChangeListenerImpl mPageChangeListenerImpl;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_main);initView();}private void initView() {mContext = this;mViewPager = (ViewPager) findViewById(R.id.guide_viewpager);mDotsLinearLayout = (LinearLayout) findViewById(R.id.dotsLinearLayout);mViewPagerAdapter = new StartPagerAdapter(mContext);mViewPager.setAdapter(mViewPagerAdapter);initDots();mPageChangeListenerImpl = new PageChangeListenerImpl(dotImageViews);//初始化PageChangeListenerImpl，通过构造器传入dotImageViewssetAutoChangeViewPager();}// 初始化小圆点private void initDots() {dotImageViews = new ImageView[mViewPagerAdapter.getCount()];for (int i = 0; i < dotImageViews.length; i++) {LinearLayout layout = new LinearLayout(mContext);ImageView imageView = new ImageView(mContext);imageView.setLayoutParams(new ViewGroup.LayoutParams(20, 20));if (i == 0) {imageView.setBackgroundResource(R.drawable.guide_dot_white);} else {layout.setPadding(20, 0, 0, 0);imageView.setBackgroundResource(R.drawable.guide_dot_black);}dotImageViews[i] = imageView;layout.addView(imageView);mDotsLinearLayout.addView(layout);}}// ViewPager轮播private void setAutoChangeViewPager() {mViewPager.setOnPageChangeListener(mPageChangeListenerImpl);mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case SET_VIEWPAGER_ITEM:if (mViewPagerAdapter != null && mViewPagerAdapter.getCount() > 0) {int currentItemIndex = mViewPager.getCurrentItem();int itemsCount = mViewPager.getAdapter().getCount();if ((currentItemIndex + 1) < itemsCount) {mViewPager.setCurrentItem(currentItemIndex + 1, true);} else {mViewPager.setCurrentItem(0, false);}}break;}}};mRunnable = new Runnable() {@Overridepublic void run() {Message message = mHandler.obtainMessage();message.what = SET_VIEWPAGER_ITEM;mHandler.sendMessage(message);mHandler.removeCallbacks(mRunnable);mHandler.postDelayed(this, INTERVAL);}};mHandler.postDelayed(mRunnable, INTERVAL);}@Overrideprotected void onDestroy() {super.onDestroy();if (null != mViewPager) {mViewPager.removeAllViews();mViewPager = null;}}}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <android.support.v4.view.ViewPager        android:id="@+id/guide_viewpager"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <LinearLayout        android:id="@+id/dotsLinearLayout"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="100px"        android:orientation="horizontal" >    </LinearLayout></RelativeLayout>

StartPagerAdapter.java

package com.cctvjiatao.viewpagerdemo;import android.content.Context;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.View;import android.widget.ImageView;/** * @作者： jiatao * @修改时间：2016-4-13 下午3:18:27 * @文件名：StartPagerAdapter.java * @版权声明：www.cctvjiatao.com * @功能： PagerAdapter ———— FragmentPagerAdapter、FragmentStatePagerAdapter 是PagerAdapter的特殊实现类 */public class StartPagerAdapter extends PagerAdapter {private Context mContext;private int[] pagesArray = { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d };public StartPagerAdapter(Context context) {this.mContext = context;}/** * 获取条目数量 */@Overridepublic int getCount() {return pagesArray.length;}/** * 实例化条目 */@Overridepublic Object instantiateItem(View container, int position) {View itemView = LayoutInflater.from(mContext).inflate(R.layout.guide_pager_adapter, null);itemView.setFocusable(true);ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);imageView.setBackgroundResource(pagesArray[position]);((ViewPager) container).addView(itemView);return itemView;}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}/** * 销毁条目 */@Overridepublic void destroyItem(View container, int position, Object object) {((ViewPager) container).removeView((View) object);}}

PageChangeListenerImpl.java

package com.cctvjiatao.viewpagerdemo;import android.support.v4.view.ViewPager;import android.widget.ImageView;/** * @作者： jiatao * @修改时间：2016-4-14 下午11:39:01 * @包名：com.cctvjiatao.viewpagerdemo * @文件名：PageChangeListenerImpl.java * @版权声明：www.cctvjiatao.com * @功能： OnPageChangeListener的实现类 */public class PageChangeListenerImpl implements ViewPager.OnPageChangeListener {private ImageView[] dotImageViews;public PageChangeListenerImpl(ImageView[] dotImageViews) {super();this.dotImageViews = dotImageViews;}@Overridepublic void onPageSelected(int selected) {for (int i = 0; i < dotImageViews.length; i++) {dotImageViews[selected].setBackgroundResource(R.drawable.guide_dot_white);if (selected != i) {dotImageViews[i].setBackgroundResource(R.drawable.guide_dot_black);}}}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageScrollStateChanged(int state) {}}