现在基本上大多数的Android应用程序的首页都有轮播图，就是像下图这样的（此图为转载的一篇博文中的图，拿来直接用了）：
像这样的组件我相信大多数的应用程序都会使用到，本文就是自定义一个这样的组件，可以动态设置图片的张数。下面就开始本次的自定义之旅吧，首先看一下自定义控件的的布局文件：
<?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.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<span style="white-space:pre"> </span><!--此LinearLayout用来小圆点-->
<LinearLayout
android:id="@+id/linearlayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center"
android:orientation="horizontal"
android:padding="5dp" >
</LinearLayout>
</RelativeLayout>布局文件看完之后，我们再来看一下自定义控件相对应的java类吧：package com.gc.view;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import com.gc.image.ImageLoaderWraper;
import com.gc.testviewpagerfragment.R;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
/**
* ViewPager实现的轮播图广告自定义视图；
* 既支持自动轮播页面也支持手势滑动切换页面,可以动态设置图片的张数
* @author Android将军
*
*/
@SuppressLint("HandlerLeak")
public class SlideShowView extends FrameLayout {
private ImageLoaderWraper imageLoaderWraper;//UIL开源框架的使用，主要用来加载图片防止OOM
private final static boolean isAutoPlay = true;
private List<String> imageUris;
private List<ImageView> imageViewsList;
private List<ImageView> dotViewsList;
private LinearLayout mLinearLayout;
private ViewPager mViewPager;
private int currentItem = 0;
private ScheduledExecutorService scheduledExecutorService;
@SuppressLint("HandlerLeak")
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
mViewPager.setCurrentItem(currentItem);
}
};
public SlideShowView(Context context) {
this(context,null);
}
public SlideShowView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SlideShowView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
initUI(context);
if(!(imageUris.size()<=0))
{
System.out.println("XXXXXXXXXXXX");
setImageUris(imageUris);
}
if(isAutoPlay){
startPlay();
}
}
private void initUI(Context context){
imageViewsList = new ArrayList<ImageView>();
dotViewsList = new ArrayList<ImageView>();
imageUris=new ArrayList<String>();
imageLoaderWraper=ImageLoaderWraper.getInstance(context.getApplicationContext());
LayoutInflater.from(context).inflate(R.layout.layout_slideshow, this, true);
mLinearLayout=(LinearLayout)findViewById(R.id.linearlayout);
mViewPager = (ViewPager) findViewById(R.id.viewPager);
}
public void setImageUris(List<String> imageuris)
{
for(int i=0;i<imageuris.size();i++)
{
imageUris.add(imageuris.get(i));
System.out.println("ＹＹＹＹＹＹＹＹＹＹ");
}
LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(5, 0, 0, 0);
for(int i=0;i<imageUris.size();i++){
ImageView imageView=new ImageView(getContext());
imageView.setScaleType(ScaleType.FIT_XY);//铺满屏幕
System.out.println("GGGGG:"+imageUris.get(i));
imageLoaderWraper.displayImage(imageUris.get(i), imageView);//用开源框架加载图片，读者可以自行更改，使用setsetBackgroundResource也行
System.out.println("JJJJJJ");
imageViewsList.add(imageView);
System.out.println("JJJJJJ55555");
ImageView viewDot = new ImageView(getContext());
System.out.println("JJJJJJ88888");
if(i == 0){
viewDot.setBackgroundResource(R.drawable.dot_black);
}else{
viewDot.setBackgroundResource(R.drawable.dot_white);
}
//viewDot.setImageResource(R.drawable.dot_white);
System.out.println("JJJJJJ9999");
viewDot.setLayoutParams(lp);
dotViewsList.add(viewDot);
mLinearLayout.addView(viewDot);
}
mViewPager.setFocusable(true);
mViewPager.setAdapter(new MyPagerAdapter());
mViewPager.setOnPageChangeListener(new MyPageChangeListener());
}
private void startPlay(){
scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
scheduledExecutorService.scheduleAtFixedRate(new SlideShowTask(), 1, 4, TimeUnit.SECONDS);
}
@SuppressWarnings("unused")
private void stopPlay(){
scheduledExecutorService.shutdown();
}
/**
* 设置选中的tip的背景
* @param selectItems
*/
private void setImageBackground(int selectItems){
for(int i=0; i<dotViewsList.size(); i++){
if(i == selectItems){
dotViewsList.get(i).setBackgroundResource(R.drawable.dot_black);
}else{
dotViewsList.get(i).setBackgroundResource(R.drawable.dot_white);
}
}
}
private class MyPagerAdapter extends PagerAdapter{
@Override
public void destroyItem(View container, int position, Object object) {
// TODO Auto-generated method stub
//((ViewPag.er)container).removeView((View)object);
((ViewPager)container).removeView(imageViewsList.get(position));
}
@Override
public Object instantiateItem(View container, int position) {
// TODO Auto-generated method stub
((ViewPager)container).addView(imageViewsList.get(position));
return imageViewsList.get(position);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return imageViewsList.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
// TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
}
private class MyPageChangeListener implements OnPageChangeListener{
boolean isAutoPlay = false;
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
switch (arg0) {
case 1:
isAutoPlay = false;
break;
case 2:
isAutoPlay = true;
break;
case 0:
if (mViewPager.getCurrentItem() == mViewPager.getAdapter().getCount() - 1 && !isAutoPlay) {
mViewPager.setCurrentItem(0);
}
else if (mViewPager.getCurrentItem() == 0 && !isAutoPlay) {
mViewPager.setCurrentItem(mViewPager.getAdapter().getCount() - 1);
}
break;
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageSelected(int pos) {
// TODO Auto-generated method stub
setImageBackground(pos % imageUris.size());
}
}
private class SlideShowTask implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
synchronized (mViewPager) {
currentItem = (currentItem+1)%imageViewsList.size();
handler.obtainMessage().sendToTarget();
}
}
}
@SuppressWarnings("unused")
private void destoryBitmaps() {
for (int i = 0; i < imageViewsList.size(); i++) {
ImageView imageView = imageViewsList.get(i);
Drawable drawable = imageView.getDrawable();
if (drawable != null) {
drawable.setCallback(null);
}
}
}
}
说过自定义控件的布局和相应类之后，我们就要来使用它了，那么我们怎么去使用这个呢，请看下面的内容。
<com.gc.view.SlideShowView
android:id="@+id/slideshowView"
android:layout_width="fill_parent"
android:layout_height="140dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
/>
<!--com.gc.view是SlideShowView所在的包名，大家使用时需把此包名换成自己的包名-->然后在相应的Activity或Fragment中这样动态设置图片：（2）调用该控件的setImageUris的方法
具体代码如下所示：
<span style="white-space:pre"> </span>List<String> imageUris=new ArrayList<String>();
imageUris.add("http://e.hiphotos.baidu.com/image/pic/item/d6ca7bcb0a46f21ffac59520f4246b600d33aed4.jpg");
imageUris.add("http://a.hiphotos.baidu.com/image/pic/item/ac345982b2b7d0a2549f27eac9ef76094b369a76.jpg");
imageUris.add("http://b.hiphotos.baidu.com/image/pic/item/d52a2834349b033b12e5c3c317ce36d3d539bdbd.jpg");
imageUris.add("assets://one.jpg");
imageUris.add("assets://two.jpg");
imageUris.add("assets://three.jpg");//上面代码是初始化图片的URI路径
<span style="font-family:Arial, Helvetica, sans-serif;"><span style="white-space:pre"> </span> mSlideShowView=(SlideShowView)findViewById(R.id.slideshowView);</span>
<span style="font-family: Arial, Helvetica, sans-serif;"><span style="white-space:pre"> </span> mSlideShowView.setImageUris(imageUris);</span>然后在应用程序中的效果如下：
转载请注明出处：http://blog.csdn.net/android_jiangjun/article/details/39638129
原文：http://blog.csdn.net/android_jiangjun/article/details/39638129