使用ViewPager实现可以自动切换的广告控件

public class CommonBannerView extends RelativeLayout {

private ImageView[] imageViews = null;
private ImageView imageView = null;
private ViewPager advPager = null;
private AtomicInteger what = new AtomicInteger(0);
private boolean isContinue = true;
private Context mContext;
private ViewGroup mGroup;
private int mCurrentIndex;

private float mTouchDownX = 0;
private float mTouchDownY = 0;

private int mCount = 0;

public CommonBannerView(Context context) {
super(context);
mContext = context;
init();
}

public CommonBannerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init();
}

public CommonBannerView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}

private void init(){
LayoutInflater.from(mContext).inflate(R.layout.layer_common_banner_view, this);
advPager = (ViewPager) findViewById(R.id.adv_pager);
mGroup = (ViewGroup) findViewById(R.id.viewGroup);
}

public void setData(){

int[] res = {R.drawable.banner0 , R.drawable.banner1 , R.drawable.banner2};
int count = res.length;
List<View> advPics = new ArrayList<View>();
for(int i = 0 ; i < count ; i ++){
ImageView img = new ImageView(mContext);
img.setImageResource(res[i]);
img.setScaleType(ImageView.ScaleType.FIT_XY);
advPics.add(img);
}

//指示banner个数及选中状态的圆点
imageViews = new ImageView[advPics.size()];
for (int i = 0; i < advPics.size(); i++) {
imageView = new ImageView(mContext);
imageView.setLayoutParams(new LayoutParams(20, 20));
imageView.setPadding(5, 5, 5, 5);
imageViews[i] = imageView;
if (i == 0) {
imageViews[i]
.setBackgroundResource(R.drawable.ic_banner_selected);
} else {
imageViews[i]
.setBackgroundResource(R.drawable.ic_banner_nor);
}
mGroup.addView(imageViews[i]);
}

mCurrentIndex = 0;

advPager.setAdapter(new AdvAdapter(advPics));

advPager.setOnPageChangeListener(new GuidePageChangeListener());
advPager.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isContinue = false;
removeMessage();
mTouchDownX = event.getX();
mTouchDownY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
isContinue = false;
break;
case MotionEvent.ACTION_UP:
//如果水平和竖直方向的移动距离均小于五个像素则视为点击事件
if (Math.abs(event.getX() - mTouchDownX) < 5 && Math.abs(event.getY() - mTouchDownY) < 5) {
//处理点击事件
}
mTouchDownX = 0;
mTouchDownY = 0;
isContinue = true;
viewHandler.sendEmptyMessageDelayed(0, 5000);
break;
default:
isContinue = true;
break;
}
return false;
}
});
}

public void start(){
viewHandler.sendEmptyMessageDelayed(0 , 5000);
}

private final class GuidePageChangeListener implements ViewPager.OnPageChangeListener {

@Override
public void onPageScrollStateChanged(int arg0) {

}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {

}

@Override
public void onPageSelected(int arg0) {
what.getAndSet(arg0);
mCurrentIndex = arg0;
mCount = arg0;
for (int i = 0; i < imageViews.length; i++) {
imageViews[arg0]
.setBackgroundResource(R.drawable.ic_banner_selected);
if (arg0 != i) {
imageViews[i]
.setBackgroundResource(R.drawable.ic_banner_nor);
}
}

}

}

public void removeMessage(){
viewHandler.removeCallbacksAndMessages(null);
}

private final class AdvAdapter extends PagerAdapter {
private List<View> views = null;

public AdvAdapter(List<View> views) {
this.views = views;
}

@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView(views.get(arg1));
}

@Override
public void finishUpdate(View arg0) {

}

@Override
public int getCount() {
return views.size();
}

@Override
public Object instantiateItem(View arg0, int arg1) {
((ViewPager) arg0).addView(views.get(arg1), 0);
return views.get(arg1);
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}

@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {

}

@Override
public Parcelable saveState() {
return null;
}

@Override
public void startUpdate(View arg0) {

}
}

private final Handler viewHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if(imageViews != null && imageViews.length != 0) {
mCount ++;
mCount %= imageViews.length;
advPager.setCurrentItem(mCount);
}
viewHandler.sendEmptyMessageDelayed(0, 5000);
super.handleMessage(msg);
}

};
}

XML文件：

<?xml version="1.0" encoding="utf-8"?><merge xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"><android.support.v4.view.ViewPagerandroid:id="@+id/adv_pager"android:layout_width="fill_parent"android:layout_height="fill_parent" /><LinearLayoutandroid:id="@+id/viewGroup"android:layout_below="@id/adv_pager"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="-25px"android:gravity="center"android:orientation="horizontal" ></LinearLayout></merge>

调用：

public class MainActivity extends ActionBarActivity {private CommonBannerView mBannerView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mBannerView = (CommonBannerView) findViewById(R.id.banner_view);mBannerView.setData();mBannerView.start();}//防止内存泄露或者下次进入时出现多个message的情况@Overrideprotected void onPause() {super.onPause();mBannerView.removeMessage();}}

<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:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"><com.dafasoft.bannertest.CommonBannerViewandroid:id="@+id/banner_view"android:layout_width="fill_parent"android:layout_height="200dp"/></RelativeLayout>