一行代码写一个自动滚动的广告栏

广告栏"/>

一行代码写一个自动滚动的广告栏

/*** 订阅页面轮播图适配器** @author ryze* @since 1.0  2019/07/17*/
public abstract class AutoLoopSwitchBaseAdapter extends PagerAdapter {public AutoLoopSwitchBaseAdapter() {}public static final int VIEWPAGER_RADIX = 100;/*** 实际轮播图个数*/public abstract int getDataCount();public abstract View getView(int position);public abstract Object getItem(int position);/*** 如果数据为空的时候,这里最好不为空*/public abstract View getEmptyView();/*** 当数据改变时，ViewPager预加载的View需要重新设置数据*/public abstract void updateView(View view, int position);@Overridepublic final int getCount() {if (getDataCount() > 1) {//如果轮播个数大于1个，那么需要轮播，增加基数，同时在首尾加上一个，return getDataCount() * VIEWPAGER_RADIX + 2;} else {return getDataCount();}}/*** 得到实际页面index*/public final int getActualIndex(int index) {int position = index;if (getDataCount() > 1) {if (index == 0) {position = getDataCount() - 1;} else if (index == getCount() - 1) {position = 0;} else {position = index - 1;}}return position;}/*** @param container* @param position* @return*/@Overridepublic final Object instantiateItem(ViewGroup container, int position) {position = getActualIndex(position);position %= getDataCount();View v = getView(position);if (v == null) {v = getEmptyView();}v.setTag(position);container.addView(v);return v;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {
//    super.destroyItem(container, position, object);container.removeView((View) object);}@Overridepublic final boolean isViewFromObject(View view, Object o) {return view == o;}}

AutoLoopSwitchBaseView.java

/*** 手动自动可以滚动** @author ryze* @since 1.0  2019/07/17*/
public abstract class AutoLoopSwitchBaseView extends RelativeLayout implements ViewPager.OnPageChangeListener {private final int VIEWPAGER_SCROLL_DURTION = 400;protected ViewPager mViewPager;protected PageShowView mPageShowView;protected View mFailtView;//private int mCurrentItem = 1;protected LoopHandler mHandler;protected boolean mIsDragging = false;protected AutoLoopSwitchBaseAdapter mPagerAdapter;//监听数据变化，用于去除 重试Viewprivate DataSetObserver mObserver;//正在切页private boolean isLoopSwitch = false;private boolean mCurrentVisible = true;public AutoLoopSwitchBaseView(Context context) {super(context);initView();}public AutoLoopSwitchBaseView(Context context, AttributeSet attrs) {super(context, attrs);initView();}public AutoLoopSwitchBaseView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);initView();}@TargetApi(Build.VERSION_CODES.LOLLIPOP)public AutoLoopSwitchBaseView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);initView();}/*** 页面切换回调** @param model adapter getItem*/protected abstract void onSwitch(int index, Object model);/*** 滚动延时时间*/protected abstract long getDurtion();/*** 如果需要网络异常处理*/protected abstract View getFailtView();@Overrideprotected void onVisibilityChanged(View changedView, int visibility) {super.onVisibilityChanged(changedView, visibility);if (visibility == VISIBLE) {mCurrentVisible = true;} else {mCurrentVisible = false;}}public boolean isCurrentVisible() {return mCurrentVisible;}public void setCurrentVisible(boolean mCurrentVisible) {this.mCurrentVisible = mCurrentVisible;}private void initView() {mViewPager = new ViewPager(getContext());mViewPager.setId(R.id.autoloopswitch_viewpager_id);mViewPager.addOnPageChangeListener(this);addView(mViewPager, generalLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));controlViewPagerSpeed();LayoutParams params;mPageShowView = new PageShowView(getContext());mPageShowView.setId(R.id.autoloopswitch_pagershow_id);//此处以及上面的id为values下ids中的id  自己添加就好DisplayMetrics displayMetrics = new DisplayMetrics();WindowManager windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);windowManager.getDefaultDisplay().getMetrics(displayMetrics);params = generalLayoutParams(LayoutParams.MATCH_PARENT, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, displayMetrics));params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);params.addRule(RelativeLayout.CENTER_HORIZONTAL);addView(mPageShowView, params);mHandler = new LoopHandler(this);}private LayoutParams generalLayoutParams(int w, int h) {LayoutParams params = new LayoutParams(w, h);return params;}@Overridepublic void onPageScrolled(int i, float v, int i1) {}@Overridepublic void onPageSelected(int i) {if (isLoopSwitch) {isLoopSwitch = false;return;}mCurrentItem = i;int datacount = mPagerAdapter.getDataCount();if (datacount > 1) {int index = mPagerAdapter.getActualIndex(i) % datacount;mPageShowView.setCurrentView(index, datacount);onSwitch(index, mPagerAdapter.getItem(index));}}@Overridepublic void onPageScrollStateChanged(int i) {if (i == ViewPager.SCROLL_STATE_DRAGGING) {mIsDragging = true;} else if (i == ViewPager.SCROLL_STATE_IDLE) {if (mViewPager.getCurrentItem() == 0) {isLoopSwitch = true;mViewPager.setCurrentItem(mPagerAdapter.getCount() - 2, false);} else if (mViewPager.getCurrentItem() == mPagerAdapter.getCount() - 1) {isLoopSwitch = true;mViewPager.setCurrentItem(1, false);}mCurrentItem = mViewPager.getCurrentItem();if (mIsDragging && mHandler != null) {//如果从dragging状态到不是mIsDraggingmHandler.sendEmptyMessageDelayed(LoopHandler.MSG_UPDATE, getDurtion());}mIsDragging = false;Log.e("ryze", "onPageScrollStateChanged  " + i);}}private void notifyDataSetChanged() {if (mPagerAdapter != null) {int datacount = mPagerAdapter.getDataCount();int currentIndex = 0;if (datacount > 1) {mCurrentItem = mPagerAdapter.getCount() / 2;currentIndex = mPagerAdapter.getActualIndex(mCurrentItem) % datacount;} else {mCurrentItem = 1;currentIndex = 0;}mViewPager.setCurrentItem(mCurrentItem);mPageShowView.setCurrentView(currentIndex, datacount);if (mFailtView != null && datacount > 0) {removeView(mFailtView);mFailtView = null;}updateView();}}private void updateView() {for (int i = 0; i < mViewPager.getChildCount(); i++) {View v = mViewPager.getChildAt(i);if (v != null) {int position = (Integer) v.getTag();mPagerAdapter.updateView(v, position);}}}public void setAdapter(AutoLoopSwitchBaseAdapter adapter) {if (mPagerAdapter != null) {mPagerAdapter.unregisterDataSetObserver(mObserver);}this.mPagerAdapter = adapter;if (mPagerAdapter != null) {if (mObserver == null) {mObserver = new PagerObserver();}mPagerAdapter.registerDataSetObserver(mObserver);if (mViewPager != null) {mViewPager.setAdapter(mPagerAdapter);}//如果没有数据，同时没有网络的情况if (mPagerAdapter.getDataCount() <= 0) {mFailtView = getFailtView();if (mFailtView != null) {addView(mFailtView, generalLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));}}} else {throw new NullPointerException("AutoLoopSwitchBaseAdapter can not null");}}public void destory() {if (mHandler != null) {mHandler.close();}}protected static class LoopHandler extends Handler {//请求更新显示的View。private static final int MSG_UPDATE = 1;//请求暂停轮播。public static final int MSG_STOP = 2;//请求恢复轮播。public static final int MSG_REGAIN = 3;private AutoLoopSwitchBaseView mView;private boolean mIsStop = false;public LoopHandler(AutoLoopSwitchBaseView mView) {this.mView = new WeakReference<AutoLoopSwitchBaseView>(mView).get();}public boolean isStop() {return mIsStop;}public void close() {removeMessages(MSG_UPDATE);removeMessages(MSG_REGAIN);removeMessages(MSG_STOP);}@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);if (mView == null || mView.mHandler == null || mView.mPagerAdapter == null || mView.mIsDragging) {return;}Log.e("ryze", "stop: " + mIsStop);switch (msg.what) {case MSG_UPDATE:if (mIsStop || hasMessages(MSG_UPDATE)) {return;}if (mView.mPagerAdapter.getCount() > 1) {mView.mCurrentItem++;mView.mCurrentItem %= mView.mPagerAdapter.getCount();mView.mViewPager.setCurrentItem(mView.mCurrentItem, true);sendEmptyMessageDelayed(MSG_UPDATE, mView.getDurtion());}break;case MSG_STOP:if (hasMessages(MSG_UPDATE)) {removeMessages(MSG_UPDATE);}mIsStop = true;Log.e("ryze", "stop: MSG_STOP " + mIsStop);break;case MSG_REGAIN:if (hasMessages(MSG_UPDATE)) {removeMessages(MSG_UPDATE);}sendEmptyMessageDelayed(MSG_UPDATE, mView.getDurtion());mIsStop = false;Log.e("ryze", "stop: MSG_REGAIN " + mIsStop);break;}}}private class PagerObserver extends DataSetObserver {private PagerObserver() {}public void onChanged() {Log.e("ryze", "PagerObserver onChanged ");notifyDataSetChanged();}public void onInvalidated() {Log.e("ryze", "PagerObserver onInvalidated ");notifyDataSetChanged();}}public ViewPager getViewPager() {return mViewPager;}private void controlViewPagerSpeed() {try {Field mField;mField = ViewPager.class.getDeclaredField("mScroller");mField.setAccessible(true);FixedSpeedScroller mScroller = new FixedSpeedScroller(getContext(),new DecelerateInterpolator());mScroller.setmDuration(VIEWPAGER_SCROLL_DURTION);mField.set(mViewPager, mScroller);mField = ViewPager.class.getDeclaredField("mFlingDistance");mField.setAccessible(true);mField.set(mViewPager, 20);} catch (Exception e) {e.printStackTrace();}}private class FixedSpeedScroller extends Scroller {private int mDuration = 600; // default time is 600mspublic FixedSpeedScroller(Context context) {super(context);}public FixedSpeedScroller(Context context, Interpolator interpolator) {super(context, interpolator);}@Overridepublic void startScroll(int startX, int startY, int dx, int dy, int duration) {// Ignore received duration, use fixed one insteadsuper.startScroll(startX, startY, dx, dy, mDuration);}@Overridepublic void startScroll(int startX, int startY, int dx, int dy) {// Ignore received duration, use fixed one insteadsuper.startScroll(startX, startY, dx, dy, mDuration);}/*** set animation time*/public void setmDuration(int time) {mDuration = time;}/*** get current animation time*/public int getmDuration() {return mDuration;}}}

AutoSwitchView.java

public class AutoSwitchView extends AutoLoopSwitchBaseView {public AutoSwitchView(Context context) {super(context);}public AutoSwitchView(Context context, AttributeSet attrs) {super(context, attrs);}public AutoSwitchView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public AutoSwitchView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);}@Overrideprotected void onSwitch(int index, Object o) {GoodsPojo model = (GoodsPojo) o;if (model != null) {}}@Overrideprotected View getFailtView() {return null;}@Overrideprotected long getDurtion() {return 3000;}@Overridepublic void setAdapter(AutoLoopSwitchBaseAdapter adapter) {super.setAdapter(adapter);mHandler.sendEmptyMessage(LoopHandler.MSG_REGAIN);}public void setFocusable(boolean f){mViewPager.setFocusable(f);}
}

PageShowView.java

public class PageShowView extends View {int colorCurrent = 0;int colorOther = 0;int total = 0;int current = 0;private Paint mPaint = null;public PageShowView(Context context) {this(context, null);}public PageShowView(Context context, AttributeSet attrs) {super(context, attrs);initColor();}protected void initColor() {colorCurrent = getResources().getColor(R.color.colorPrimary);//当前显示的图片页码颜色colorOther = getResources().getColor(R.color.gray_99);//其余的页码颜色mPaint = new Paint();}public void setCurrentView(int current, int total) {this.current = current;this.total = total;invalidate();}@Overrideprotected void dispatchDraw(Canvas canvas) {super.dispatchDraw(canvas);int view_height = getHeight() - getPaddingBottom() - getPaddingBottom();int view_width = getWidth() - getPaddingLeft() - getPaddingRight();int height = view_height / 6;int width = height * 4;if (total > 1) {if (width * total + height * (total - 1) > view_width) {width = (view_width - (height * (total - 1))) / total;}int posX = view_width / 2 - (width * total + height * (total - 1) * 3) / 2;mPaint.setStrokeWidth(height);mPaint.setAntiAlias(false);for (int i = 0; i < total; i++) {if (i != current) {mPaint.setColor(colorOther);} else {mPaint.setColor(colorCurrent);}canvas.drawCircle(posX, view_height / 3, view_height / 3, mPaint);posX += height * 3 + width;}}}/*** 获取当前显示的位置*/public int getCurrent() {return this.current;}}

AutoSwitchAdapter.java

public class AutoSwitchAdapter extends AutoLoopSwitchBaseAdapter {private Context mContext;//GoodsPojo是实体类  你可以根据你自己的需求替换private List<GoodsPojo> mDatas;public AutoSwitchAdapter() {super();}public AutoSwitchAdapter(Context mContext, List<GoodsPojo> mDatas) {this.mContext = mContext;this.mDatas = mDatas;}@Overridepublic int getDataCount() {return mDatas == null ? 0 : mDatas.size();}@Overridepublic View getView(final int position) {ImageView imageView = new ImageView(mContext);imageView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT));final GoodsPojo pojo = (GoodsPojo) getItem(position);imageView.setScaleType(ImageView.ScaleType.FIT_XY);GlideImageLoader.onDisplayImage(mContext,imageView,mDatas.get(position).url);imageView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View _view) {//此处写图片点击事件}});return imageView;}@Overridepublic Object getItem(int position) {if (position >= 0 && position < getDataCount()) {return mDatas.get(position);}return null;}@Overridepublic View getEmptyView() {return null;}@Overridepublic void updateView(View view, int position) {}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {super.destroyItem(container, position, object);}
}

xml布局文件中使用

<com.****.****.AutoSwitchView /*此处为AutoSwitchView的绝对路径*/android:id="@+id/vp"android:layout_width="match_parent"android:layout_height="160dp"app:layout_scrollFlags="scroll"/>

代码中调用

vp.setAdapter(new AutoSwitchAdapter(Context,GoodsPojos));