android中左右滑屏的实现（广告位banner组件）
- 原理
参见下图。整个组件是一个FrameLayout，里面有两个view，第一个是LinearLayout，承载了4个（或多个）可以滑动的view，见图中绿色背景的部分；第二个是一个RelativeLayout，在其底部放置了一个LinearLayout，在LinearLayout的内部放置了若干个小圆点，用来指示当前屏幕的索引。手势检测用了GestureDetector，并实现了OnGestureListener接口。为了能控制滑动速度，采用了Scroller弹性滑动对象。
为什么组件继承FrameLayout，是因为用于指示的小圆点是出现在view上面的，一个view叠在另一个view上面，这就是FrameLayout的特性
什么是banner组件？在许多android应用上，比如爱奇艺客户端、百度美拍、应用宝等上面，都有一个可以手动滑动的小广告条，这就是banner，实际应用中的banner，其信息（图片和点击行为）是后台可配置的，是需要通过网络从后台拉取的。网上有许多手动滑屏的例子，但是一般只是个demo，无法在实际中使用，因为其一般没有考虑如下几类问题：图片缓存、OOM问题、是否可灵活配置、是否预留外部接口以及是否封装良好。没有良好的封装，手动滑屏加在代码中，会使得代码变得很烂很脆弱。
2. 功能、效果
- banner属性可动态设置，默认数量为4，可以调整默认的数量
- banner信息从后台获取，banner的条数就是屏幕的数量
- 可自动滑动也能手动滑动
- 图片下载为多线程，并采用常见的三级cache策略（内存、文件、网络），节省流量，并处理了OOM异常
- 内部处理点击事件，同时预留出了接口函数
- banner封装成一个ViewGroup类，使用起来简单，最少只需要两行代码
3. 代码
代码注释写的比较详细，应该很好理解。分为2个文件，一个是banner的类，另一个是接口声明。
ScrollBanner.java
/**
* ScrollBanner 支持滑屏效果的FrameLayout子类，可设置屏幕数量，尺寸。
* 典型的用法：
* ScrollBanner scrollBanner = new ScrollBanner(this, mScreenWidth, 100, this);
* linearLayout.addView(scrollBanner);
*注意事项：
*1.如果重新设置ScrollBanner的LayoutParams，则参数中的宽和高属性将被忽略，仍然采用对象实例化的宽和高
*2.点击事件的回调如果设为null，则采用默认的事件回调
*3.通过setOverScrollMode来设置 banner是否能够滑出屏幕的边界
*4通过xml方式加载banner，需要进行如下调用：
* setResolution(width, height);
setOnBannerClickListener(bannerClickListener);
showBanner()
* @author singwhatiwanna
* @version 2013.3.4
*
*/
public class ScrollBanner extends FrameLayout implements
ComponentCallBack.OnBannerClickListener,
ResponseHandler.BannerInfoHandler
{
private static final String TAG = "ScrollBanner";
private HorizontalScrollViewEx mHorizontalScrollViewEx;
//ScrollBanner的子view
private LinearLayout linearLayoutScrolLayout;
//linearLayoutScrolLayout的子view，用于放置若干个小圆点
private LinearLayout linearLayoutForDot;
private Scroller mScroller;
private Context mContext;
private OnBannerClickListener mBannerClickListener;
//屏幕及其bitmap
private List mLinearLayoutScreens = new ArrayList();
private List mBannerBitmaps = new ArrayList();
//banner信息
private List mBannerItemsList = new ArrayList();
//小圆点
private List mImageViewList = new ArrayList();
private Drawable mPageIndicator;
private Drawable mPageIndicatorFocused;
//banner默认图片
private Bitmap mDefaultBitmap;
private int mScreenWidth;
private int mScreenHeight;
private int mScrollX;
//current screen index
private int mWhich = 0;
public static final int MESSAGE_AUTO_SCROLL = 1;
public static final int MESSAGE_FETCH_BANNER_SUCCESS = 2;
public static final int MARGIN_BOTTOM = 2;
//480*150 banner的图片尺寸 150.0/480=0.3125f
public static final float ratio = 0.3125f;
//banner的位置
private int mLocation = -1;
//banner分为几屏
private int PAGE_COUNT = 4;
//滑动方向 是否向右滑动
private boolean mScrollToRight = true;
//是否自动滑屏
private boolean mTimerResume = true;
//标志用户是否手动滑动了屏幕
private boolean mByUserAction = false;
//标志banner是否可以滑出边界
private boolean mOverScrollMode = false;
//标志banner可以滑出边界多少像素
private int mOverScrollDistance = 0;
//定时器 用于banner的自动播放
final Timer timer = new Timer();
//定时器的时间间隔 单位：ms
public static final int TIMER_DURATION = 5000;
private TimerTask mTimerTask = new TimerTask()
{
@Override
public void run()
{
if (mTimerResume && !mByUserAction)
{
mHandler.sendEmptyMessage(MESSAGE_AUTO_SCROLL);
}
mByUserAction = false;
}
};
//ScrollBanner私有handler 用于处理内部逻辑
private Handler mHandler = new Handler()
{
public void handleMessage(Message msg)
{
//表示已经执行了onDetachedFromWindow，banner已经被销毁了
if( mBannerBitmaps == null || mLinearLayoutScreens == null ||
mImageViewList == null || mBannerItemsList == null || mContext == null )
return;
switch (msg.what)
{
case MESSAGE_AUTO_SCROLL:
if (mWhich == PAGE_COUNT - 1)
mScrollToRight = false;
else if(mWhich == 0)
{
mScrollToRight = true;
}
if (mScrollToRight)
mWhich++;
else
{
mWhich--;
}
mHorizontalScrollViewEx.switchView(mWhich);
break;
case MESSAGE_FETCH_BANNER_SUCCESS:
int more = 0;
if(mBannerItemsList != null)
more = mBannerItemsList.size() - PAGE_COUNT;
if(mBannerItemsList.size() > 0)
{
//如果有banner 显示它
ScrollBanner.this.show(true);
}
//如果后台返回的banneritem的数量大于预设值4
if(more > 0)
{
for (int i = 0; i < more; i++)
addBannerItem();
}
fetchBannerImages();
break;
default:
break;
}
};
};
//用于获取bitmap
private Handler mBitmapHandler = new Handler()
{
public void handleMessage(Message msg)
{
//表示已经执行了onDetachedFromWindow，banner已经被销毁了
if( mBannerBitmaps == null || mLinearLayoutScreens == null ||
mImageViewList == null || mBannerItemsList == null || mContext == null )
return;
Bitmap bitmap = (Bitmap)msg.obj;
String urlString = msg.getData().getString("url");
Logger.d(TAG, "url=" + urlString);
if (urlString == null || bitmap == null || mBannerItemsList == null)
{
Logger.w(TAG, "bitmap=null imgurl=" + urlString);
return;
}
for( int i = 0; i < mBannerItemsList.size(); i++ )
{
BannerItem item = mBannerItemsList.get(i);
if(item != null && urlString.equals(item.imgUrl) )
{
Logger.d(TAG, "find " + i + urlString);
if( mBannerBitmaps != null )
{
mBannerBitmaps.set( i, bitmap );
setBannerImages(i);
}
break;
}
}
};
};
public ScrollBanner(Context context)
{
this(context, null);
}
public ScrollBanner(Context context, AttributeSet attrs)
{
super(context, attrs);
mContext = context;
}
public ScrollBanner(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
mContext = context;
}
/**
*
* @param context activity实例
* @param width banner的宽度 单位px
* @param height banner的高度 单位dip,-1表示根据图片比例自适应高度
* @param bannerClickListener 单击banner的回调接口
*/
public ScrollBanner(Context context, final int width, final int height, OnBannerClickListener bannerClickListener)
{
this(context, null);
int activityId = ( (BaseActivity)context ).activityId();
if(activityId == BaseActivity.ACCOUNT_ID)//位置3
mLocation = 3;
else if(activityId == BaseActivity.GAMEZONE_ID)//位置2
{
mLocation = 2;
}
//初始化时不显示banner
this.show(false);
setResolution(width, height);
setOnBannerClickListener(bannerClickListener);
setDefaultBannerImages();
fetchBannerInfo();
}
/**
* 通过xml方式加载banner，必须调用此方法才能显示
*/
public void showBanner()
{
int activityId = ( (BaseActivity)mContext ).activityId();
if(activityId == BaseActivity.ACCOUNT_ID)//位置3
mLocation = 3;
else if(activityId == BaseActivity.GAMEZONE_ID)//位置2
{
mLocation = 2;
}
setDefaultBannerImages();
fetchBannerInfo();
}
/**
* 暂停滚动
*/
public void pauseScroll()
{
mTimerResume = false;
}
/**
* 恢复滚动
*/
public void resumeScroll()
{
mTimerResume = true;
}
/**
* 设置回调接口
* @param callBack 单击banner的回调接口
*/
public void setOnBannerClickListener(OnBannerClickListener bannerClickListener)
{
mBannerClickListener = (bannerClickListener != null ? bannerClickListener : ScrollBanner.this);
}
/**
* 设置banner的解析度
* @param width banner的宽度
* @param height banner的高度
*/
public void setResolution(final int width, final int height)
{
int heightInPx = height;
if(height == -1)
heightInPx = (int)(ratio * width) ;
else
{
Resources resources = getResources();
heightInPx = Math.round( TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, height, resources.getDisplayMetrics()) );
}
mScreenWidth = width;
mScreenHeight = heightInPx;
setLayoutParams(new LayoutParams(width, heightInPx));
initScrollView();
}
/**
* 获取banner的高度
* @return banner的高度 单位：px
*/
public int getHeightPixels()
{
return mScreenHeight;
}
/**
* 设置banner是否可以弹性滑出边界
* @param canOverScroll true表示可以滑出边界，false不能
*/
public void setOverScrollMode(boolean canOverScroll)
{
mOverScrollMode = canOverScroll;
if(canOverScroll == false)
mOverScrollDistance = 0;
}
/**
* 向后台获取banner的各种信息
*/
private void fetchBannerInfo()
{
NetworkManager netManager = (NetworkManager) AppEngine.getInstance().getManager(
IManager.NETWORK_ID);
netManager.getBannerInfo( String.valueOf(mLocation), ScrollBanner.this );
}
/**
* 获取banner的滑屏图像
*/
private void setDefaultBannerImages()
{
//为banner设置默认bitmap
BitmapFactory.Options bitmapFactoryOptions = new BitmapFactory.Options();
bitmapFactoryOptions.inJustDecodeBounds = false;
bitmapFactoryOptions.inSampleSize = 2;
Resources res=mContext.getResources();
mDefaultBitmap = BitmapFactory.decodeResource(res, R.drawable.banner_image_default, bitmapFactoryOptions);
for(int i = 0; i < PAGE_COUNT; i++)
mBannerBitmaps.add(i, mDefaultBitmap);
//初始化BannerItem对象
for (int i = 0; i < PAGE_COUNT; i++)
mBannerItemsList.add(i, null);
setBannerImages(-1);
}
private void fetchBannerImages()
{
//表示已经执行了onDetachedFromWindow，banner已经被销毁了
if( mBannerItemsList == null )
return;
//ImageManager 根据url向其获取bitmap
ImageManager imageManager = (ImageManager)AppEngine.getInstance().
getManager(IManager.IMAGE_ID);
BannerItem item = null;
for(int i = 0; i < PAGE_COUNT; i++)
{
try
{
item = mBannerItemsList.get(i);
}
catch (IndexOutOfBoundsException e)
{
Logger.e(TAG, "fetchBannerImages error: " + e);
}
catch (Exception e)
{
Logger.e(TAG, "fetchBannerImages error: " + e);
}
//ImageManager为多线程，采用常见的三级cache策略（内存、文件、网络）
if( item != null && item.imgUrl != null )
imageManager.loadBitmap( item.imgUrl, mBitmapHandler );
}
}
/**
* 设置banner的滑屏图像
* @param position 如果position=-1，则表示设置全部bitmap
*/
private void setBannerImages(final int position)
{
int size = mBannerBitmaps.size();
if (size < PAGE_COUNT || mLinearLayoutScreens == null)
{
return;
}
if(position >=0 && position < PAGE_COUNT )
{
Drawable drawable = mLinearLayoutScreens.get(position).getBackground();
mLinearLayoutScreens.get(position).setBackgroundDrawable
(new BitmapDrawable( mBannerBitmaps.get(position) ) );
drawable.setCallback(null);
drawable = null;
return;
}
for(int i = 0; i < PAGE_COUNT; i++)
{
mLinearLayoutScreens.get(i).setBackgroundDrawable(new BitmapDrawable(mBannerBitmaps.get(i)));
}
}
/**
* 是否显示banner
* @param isShow true显示 false不显示
*/
public void show(boolean isShow)
{
if(isShow)
{
this.setVisibility(View.VISIBLE);
mTimerResume = true;
}
else
{
this.setVisibility(View.GONE);
mTimerResume = false;
}
}
/**
* 切换到指定屏幕
* @param which 屏幕索引
*/
public void switchToScreen(final int which)
{
mHorizontalScrollViewEx.switchView(which);
}
/**
* 设置屏幕的数量 （此函数暂不开放）
* @param count 屏幕数量
*/
protected void setScreenCount(final int count)
{
PAGE_COUNT = count;
}
/**
* 设置偏移的距离 如果mOverScrollMode为false，则此设置无效 （此函数暂不开放）
* @param distance
*/
protected void setOverScrollDistance(int distance)
{
if(distance < 0)
distance = 0;
mOverScrollDistance = mOverScrollMode ? distance : 0;
}
/**
* 切换小圆点
* @param position current screen index
*/
private void switchScreenPosition(final int position)
{
if( mPageIndicator == null || mPageIndicatorFocused == null )
return;
int length = 0;
if(mImageViewList != null)
length = mImageViewList.size();
if (position >= length || position < 0 || length <= 0)
{
return;
}
for(int i = 0; i < length; i++)
{
mImageViewList.get(i).setImageDrawable(mPageIndicator);
}
mImageViewList.get(position).setImageDrawable(mPageIndicatorFocused);
}
/**
* 初始化整个FrameLayout视图组
*/
private void initScrollView()
{
setLayoutParams(new LayoutParams(mScreenWidth, mScreenHeight ));
linearLayoutScrolLayout = new LinearLayout(mContext);
linearLayoutScrolLayout.setBackgroundColor(Color.WHITE);
linearLayoutScrolLayout.setOrientation(LinearLayout.HORIZONTAL);
int mVersionCode = 8;
try
{
mVersionCode = Integer.valueOf(android.os.Build.VERSION.SDK);
Logger.d(TAG, "sdk version=" + mVersionCode);
}
catch (Exception e)
{
e.printStackTrace();
}
//针对android1.6及以下的特殊处理 此为android的低版本bug
if(mVersionCode <= 5)
{
linearLayoutScrolLayout.setBaselineAligned(false);
}
//初始化四个滑动view
for(int i = 0; i < PAGE_COUNT; i++)
{
LinearLayout linearLayoutScreen = new LinearLayout(mContext);
linearLayoutScreen.setOrientation(LinearLayout.VERTICAL);
linearLayoutScrolLayout.addView(linearLayoutScreen, new LayoutParams(
mScreenWidth,
LayoutParams.FILL_PARENT));
mLinearLayoutScreens.add(i, linearLayoutScreen);
}
//初始化小圆点视图
RelativeLayout relativeLayout = new RelativeLayout(mContext);
relativeLayout.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
//linearLayoutForDot为小圆点视图
linearLayoutForDot =new LinearLayout(mContext);
android.widget.RelativeLayout.LayoutParams layoutParams =
new android.widget.RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
//小圆点距底部的距离 单位:px
layoutParams.bottomMargin = MARGIN_BOTTOM;
layoutParams.rightMargin = MARGIN_BOTTOM;
layoutParams.addRule(android.widget.RelativeLayout.ALIGN_PARENT_BOTTOM);
layoutParams.addRule(android.widget.RelativeLayout.CENTER_HORIZONTAL);
linearLayoutForDot.setLayoutParams(layoutParams);
linearLayoutForDot.setOrientation(LinearLayout.HORIZONTAL);
linearLayoutForDot.setHorizontalGravity(Gravity.CENTER);
linearLayoutForDot.setVerticalGravity(Gravity.CENTER);
//下面两句实现圆角半透明效果 不采用
// linearLayoutForDot.setBackgroundResource(R.drawable.round_corner_bg);
// linearLayoutForDot.getBackground().setAlpha(100);
//初始化4个小圆点
mPageIndicator = getResources().getDrawable(R.drawable.page_indicator);
mPageIndicatorFocused = getResources().getDrawable(R.drawable.page_indicator_focused);
for(int i = 0; i < PAGE_COUNT; i++)
{
ImageView imageView = new ImageView(mContext);
imageView.setImageDrawable(mPageIndicator);
mImageViewList.add(i, imageView);
LinearLayout.LayoutParams layoutParamsForDot =
new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
layoutParamsForDot.rightMargin = 5;
linearLayoutForDot.addView(imageView, layoutParamsForDot);
}
mImageViewList.get(0).setImageDrawable(mPageIndicatorFocused);
relativeLayout.addView(linearLayoutForDot);
mHorizontalScrollViewEx = new HorizontalScrollViewEx(mContext, null, mBannerClickListener);
mHorizontalScrollViewEx.setLayoutParams(new LayoutParams(
mScreenWidth * PAGE_COUNT,
LayoutParams.FILL_PARENT));
mHorizontalScrollViewEx.addView(linearLayoutScrolLayout, new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT));
mHorizontalScrollViewEx.setHorizontalScrollBarEnabled(false);
mHorizontalScrollViewEx.setHorizontalFadingEdgeEnabled(false);
addView(mHorizontalScrollViewEx);
addView(relativeLayout);
//自动滑屏 5秒一次
timer.schedule(mTimerTask, 5000, TIMER_DURATION);
}
/**
* 加一个banner页面 TODO此函数写的不好
*/
private void addBannerItem()
{
//表示已经执行了onDetachedFromWindow，banner已经被销毁了
if( mBannerBitmaps == null || mLinearLayoutScreens == null ||
mImageViewList == null || mContext == null )
return;
//调整屏幕数量和总宽度
PAGE_COUNT += 1;
mHorizontalScrollViewEx.getLayoutParams().width = mScreenWidth * PAGE_COUNT;
//加载默认图片资源
if(mDefaultBitmap == null)
{
BitmapFactory.Options bitmapFactoryOptions = new BitmapFactory.Options();
bitmapFactoryOptions.inJustDecodeBounds = false;
bitmapFactoryOptions.inSampleSize = 2;
Resources res=mContext.getResources();
mDefaultBitmap = BitmapFactory.decodeResource(res, R.drawable.banner_image_default, bitmapFactoryOptions);
}
mBannerBitmaps.add(mDefaultBitmap);
mBannerItemsList.add(null);
//加一个屏幕
LinearLayout linearLayoutScreen = new LinearLayout(mContext);
linearLayoutScreen.setOrientation(LinearLayout.VERTICAL);
linearLayoutScreen.setBackgroundDrawable(new BitmapDrawable( mBannerBitmaps.get(PAGE_COUNT - 1) ));
linearLayoutScrolLayout.addView(linearLayoutScreen, new LayoutParams(
mScreenWidth,
LayoutParams.FILL_PARENT));
mLinearLayoutScreens.add(linearLayoutScreen);
//加一个小圆点
ImageView imageView = new ImageView(mContext);
imageView.setImageDrawable(mPageIndicator);
mImageViewList.add(imageView);
LinearLayout.LayoutParams layoutParamsForDot =
new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
layoutParamsForDot.rightMargin = 5;
linearLayoutForDot.addView(imageView, layoutParamsForDot);
}
private class HorizontalScrollViewEx extends ViewGroup implements
OnGestureListener
{
private GestureDetector mGestureDetector;
private int mWhichScreen;
public HorizontalScrollViewEx(Context context, AttributeSet attrs, OnBannerClickListener bannerClickListener)
{
super(context, attrs);
mGestureDetector = new GestureDetector(this);
//解决长按屏幕后无法拖动的现象
mGestureDetector.setIsLongpressEnabled(false);
//构造弹性滑动对象
mScroller = new Scroller(context);
}
/**
* 切换到指定屏幕
* @param whichScreen 屏幕index
*/
public void switchView(int whichScreen)
{
if(mLinearLayoutScreens == null)
return;
// 防止非法参数
if (whichScreen < 0)
whichScreen = 0;
else if(whichScreen >= PAGE_COUNT)
whichScreen = PAGE_COUNT - 1;
Logger.i(TAG, "switch view to " + whichScreen);
int delta = whichScreen * mScreenWidth - HorizontalScrollViewEx.this.getScrollX();
//缓慢滚动到指定位置
mScroller.startScroll(getScrollX(), 0, delta, 0, Math.abs(delta) * 3);
// refresh
invalidate();
//delta>0 stands for user scroll view to right
if (delta > 0)
mScrollToRight = true;
else
{
mScrollToRight = false;
}
mWhichScreen = whichScreen;
mWhich = whichScreen;
//切换小圆点
switchScreenPosition(mWhichScreen);
}
/**
* 用户轻触触摸屏，由1个MotionEvent ACTION_DOWN触发
*/
@Override
public boolean onDown(MotionEvent e)
{
Logger.i("MyGesture", "onDown");
mScrollX = HorizontalScrollViewEx.this.getScrollX();
return true;
}
/**
* 用户轻触触摸屏，尚未松开或拖动，由一个1个MotionEvent ACTION_DOWN触发
* 注意和onDown()的区别，强调的是没有松开或者拖动的状态
*/
public void onShowPress(MotionEvent e)
{
Logger.i("MyGesture", "onShowPress");
}
/**
* 用户（轻触触摸屏后）松开，由一个1个MotionEvent ACTION_UP触发
*/
public boolean onSingleTapUp(MotionEvent e)
{
Logger.i("MyGesture", "onSingleTapUp");
if(mBannerItemsList == null || mBannerItemsList.size() <= mWhichScreen)
return false;
BannerItem bannerItem = mBannerItemsList.get(mWhichScreen);
if(bannerItem != null)
{
BannerMotionEvent bannerMotionEvent =
new BannerMotionEvent(mWhichScreen, bannerItem.action, bannerItem.url,
bannerItem.gameId, bannerItem.gameType, bannerItem.title);
mBannerClickListener.onBannerClick(bannerMotionEvent);
}
return false;
}
/** 用户按下触摸屏、快速移动后松开，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE,
* 1个ACTION_UP触发
*/
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY)
{
Logger.i("MyGesture", "onFling velocityX=" + velocityX);
mWhichScreen = velocityX > 0 ?
mWhichScreen - 1
: mWhichScreen + 1;
switchView(mWhichScreen);
return true;
}
/**
* 用户按下触摸屏，并拖动，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE触发
*/
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY)
{
Logger.i("MyGesture", "onScroll");
//禁止弹性滚动
if (mOverScrollMode == false)
{
float x1 = e1.getX();
float x2 = e2.getX();
if(mWhichScreen == 0 && x1 < x2)
return false;
else if(mWhichScreen == PAGE_COUNT - 1 && x1 > x2)
return false;
}
// int distance = Math.abs(getScrollX() - mWhichScreen * mScreenWidth);
// if ((mWhichScreen ==0 || mWhichScreen == PAGE_COUNT -1) && distance > mOverScrollDistance)
// return false;
this.scrollBy((int)distanceX, 0);
return true;
}
/**
* 用户长按触摸屏，由多个MotionEvent ACTION_DOWN触发
*/
public void onLongPress(MotionEvent e)
{
Logger.i("MyGesture", "onLongPress");
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
if(event.getAction() == MotionEvent.ACTION_DOWN)
{
mTimerResume = false;
if ( !mScroller.isFinished() )
mScroller.abortAnimation();
}
else if(event.getAction() == MotionEvent.ACTION_UP)
{
//开始自动滑屏
mTimerResume = true;
mByUserAction = true;
}
boolean consume = mGestureDetector.onTouchEvent(event);
if (consume == false && event.getAction() == MotionEvent.ACTION_UP)
{
int curScrollX = HorizontalScrollViewEx.this.getScrollX();
int mWhichScreen = (curScrollX + mScreenWidth / 2) /mScreenWidth;
switchView(mWhichScreen);
}
return consume;
}
@Override
public void computeScroll()
{
if (mScroller.computeScrollOffset())
{
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
if (changed)
{
int childLeft = 0;
final int childCount = getChildCount();
for (int i=0; i
*getAction()来获取动作类别
*getResponseUrl()来获取响应url
*...
*/
public static class BannerMotionEvent extends Object
{
/**
* ACTION_PLAY_FLASH： 播放游戏
*/
public static final int ACTION_PLAY = 2;
/**
* ACTION_HOMEPAGE：打开官网
*/
public static final int ACTION_HOMEPAGE = 3;
/**
* ACTION_OPEN_URL：打开指定url
*/
public static final int ACTION_OPEN_URL = 4;
//banner中屏幕的index
private int index = -1;
//响应url
private String responseUrl = "";
//动作种类
private int action = -1;
//gameid
private String gameId = "";
//gametype flash游戏(0) or h5游戏(1)
private String gameType = "";
//webview的标题
private String title = "";
public BannerMotionEvent(int index, int action, String responseUrl,
String gameId, String gameType, String title)
{
BannerMotionEvent.this.index = index;
BannerMotionEvent.this.action = action;
BannerMotionEvent.this.responseUrl = responseUrl;
BannerMotionEvent.this.gameId = gameId;
BannerMotionEvent.this.gameType = gameType;
BannerMotionEvent.this.title = title;
}
/**
* 获取当前BannerMotionEvent事件对象的动作种类
* @return 动作种类：ACTION_PLAY等
*/
public int getAction()
{
return action;
}
/**
* 获取当前BannerMotionEvent事件对象的title
* @return title webview的标题
*/
public String getTitle()
{
return title;
}
/**
* 获取当前BannerMotionEvent事件对象的gameId
* @return gameId
*/
public String getGameId()
{
return gameId;
}
/**
* 获取当前BannerMotionEvent事件对象的gameType
* @return gameType 0 or 1
*/
public String getGameType()
{
return gameType;
}
/**
* 获取当前BannerMotionEvent事件对象的响应url
* @return 响应url
*/
public String getResponseUrl()
{
return responseUrl;
}
@SuppressLint("DefaultLocale")
@Override
public String toString()
{
return String.format("BannerMotionEvent { index=%d, action=%d, responseUrl=%s, gameId=%s, gameType=%s, title=%s }",
index, action, responseUrl, gameId, gameType, title);
}
}
@Override
public void onBannerInfoSuccess(List items)
{
Logger.d(TAG, "onBannerInfoSuccess");
mBannerItemsList = items;
mHandler.sendEmptyMessage(MESSAGE_FETCH_BANNER_SUCCESS);
}
@Override
public void onBannerInfoFailed()
{
Logger.e(TAG, "onBannerInfoFailed");
}
} ComponentCallBack.java
public interface ComponentCallBack
{
public static interface OnBannerClickListener
{
/**
* banner单击事件
* @param bannerMotionEvent 单击事件对象，包含所需的响应信息
* 参见 {@link BannerMotionEvent}
*/
public abstract void onBannerClick( BannerMotionEvent bannerMotionEvent );
}
}