MainActivity如下:
LauncherViewPagerAdapter如下:
guide_pager_adapter.xml如下:
package cc.ww;
import java.util.ArrayList;
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.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
/**
* 原创作者:
* 谷哥的小弟 http://blog.csdn.net/lfdfhl
*
* Demo描述:
* 1 ViewPager的自动轮播
* 2 同时支持手动切换ViewPager的Item
* 3 解决了当图片小于三张ViewPager轮播时崩溃的问题
*/
public class MainActivity extends Activity {
private Context mContext;
private Handler mHandler;
private Runnable mRunnable;
private ViewPager mViewPager;
private int viewPagerItemSize=0;
private ImageView[] dotImageViews;
private final int INTERVAL =1000 * 3;
private ArrayList<Integer> mArrayList;
private LinearLayout mDotsLinearLayout;
private final static int SET_VIEWPAGER_ITEM=9527;
private LauncherViewPagerAdapter mViewPagerAdapter;
private PageChangeListenerImpl mPageChangeListenerImpl;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//去掉状态栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
init();
}
//初始化
private void init() {
initData();
if(viewPagerItemSize>0){
initDots();
initViewPager();
setAutoChangeViewPager();
}
}
//准备ViewPager将显示的数据
private void initData(){
mContext = this;
mArrayList=new ArrayList<Integer>();
mArrayList.add(R.drawable.a);
mArrayList.add(R.drawable.b);
mArrayList.add(R.drawable.c);
mArrayList.add(R.drawable.d);
viewPagerItemSize=mArrayList.size();
}
//初始化ViewPager
private void initViewPager(){
mViewPager = (ViewPager) findViewById(R.id.guide_viewpager);
mViewPagerAdapter = new LauncherViewPagerAdapter(mContext);
mViewPagerAdapter.setAdapterData(mArrayList);
mViewPager.setAdapter(mViewPagerAdapter);
int currentItem = Integer.MAX_VALUE/2 - Integer.MAX_VALUE/2 % viewPagerItemSize;
mViewPager.setCurrentItem(currentItem);
setdotImageViews(currentItem%viewPagerItemSize);
mViewPager.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
mViewPager.requestDisallowInterceptTouchEvent(true);
return false;
}
});
}
//初始化底部小圆点
private void initDots() {
mDotsLinearLayout = (LinearLayout) findViewById(R.id.dotsLinearLayout);
dotImageViews = new ImageView[viewPagerItemSize];
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);
}
}
//开启ViewPager的自动轮播
@SuppressWarnings("deprecation")
private void setAutoChangeViewPager() {
mPageChangeListenerImpl = new PageChangeListenerImpl();
mViewPager.setOnPageChangeListener(mPageChangeListenerImpl);
mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case SET_VIEWPAGER_ITEM:
if (mViewPager != null && mViewPagerAdapter != null) {
int currentItemIndex = mViewPager.getCurrentItem();
int itemsCount = mViewPagerAdapter.getCount();
if ((currentItemIndex + 1) < itemsCount) {
mViewPager.setCurrentItem(currentItemIndex + 1, true);
} else {
mViewPager.setCurrentItem(0, false);
}
}
break;
}
}
};
mRunnable = new Runnable() {
@Override
public 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);
}
//设置小圆点的显示
private void setdotImageViews(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);
}
}
}
//ViewPager翻页后更新小圆点的显示
private class PageChangeListenerImpl implements ViewPager.OnPageChangeListener {
@Override
public void onPageSelected(int selected) {
setdotImageViews(selected % viewPagerItemSize);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(null!=mViewPager){
mViewPager.removeAllViews();
mViewPager = null;
}
}
}
LauncherViewPagerAdapter如下:
package cc.ww;
import java.util.ArrayList;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
public class LauncherViewPagerAdapter extends PagerAdapter {
private Context mContext;
private ArrayList<Integer> pagesArrayList;
private View itemView;
public LauncherViewPagerAdapter(Context context) {
this.mContext = context;
}
/**
* 设置ViewPager将要显示的数据.
* 当图片数量小于三张的时候,通过复制组拼数据
*/
public void setAdapterData(ArrayList<Integer> arrayList){
pagesArrayList=arrayList;
if (pagesArrayList.size()<1) {
Toast.makeText(mContext, "ViewPager item size=0", Toast.LENGTH_LONG).show();
}else if(pagesArrayList.size()<2){
pagesArrayList.add(pagesArrayList.get(0));
pagesArrayList.add(pagesArrayList.get(0));
pagesArrayList.add(pagesArrayList.get(0));
}else if(pagesArrayList.size()<3){
pagesArrayList.add(pagesArrayList.get(0));
pagesArrayList.add(pagesArrayList.get(1));
}
System.out.println("-----> PagerAdapter中item的个数="+pagesArrayList.size());
}
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
if (pagesArrayList.size() > 0) {
itemView=LayoutInflater.from(mContext).inflate(R.layout.guide_pager_adapter, null);
itemView.setFocusable(true);
ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);
imageView.setBackgroundResource(pagesArrayList.get(position%pagesArrayList.size()));
container.addView(itemView);
return itemView;
}
return null;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
activity_main.xml如下:
<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_marginBottom="100px"
android:layout_centerHorizontal="true"
android:orientation="horizontal">
</LinearLayout>
</RelativeLayout>
guide_pager_adapter.xml如下:
<?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">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
