Android自定义View(七)--很low的bannerView.doc

Android自定义View（七）-很low的bannerView作为一个长期“拷贝”的程序猿，偶尔还是有点小失落的，偶尔也会有大神梦，即使那么遥不可及。 于是乎，在一个月黑风高的夜晚，有史以来最low的广告banner诞生了。先谈谈整体的思路吧，看到有些大神用AdapterView实现的，而我这种渣，首先想到的就是viewpager，虽然viewpager没有那么完美，不过能勉强将就也还是极好的。当然只有viewpager是不够的，还有viewpager上面的那几个小点点，这个我就更简单粗暴的用一个Layout装载了结果imageview，然后viewpager改变item的时候，改变小点点的图片就可以啦。还有一个问题就是循环播放啦，这个就要从viewpager的adapter入手了，上网查了很多，得到的结论就是在adapter的getCount方法上做手脚，即返回一个很大的数，使viewpager的item数量大于你看到的实际数量，而多的item中显示与前面item相同的内容，这样看起来就是循环的啦。剩下的要解决自动循环就更简单啦，管你用timer还是handler还是thread都可以简单搞定。最后要解决的就是使这个东西用起来比较简单，所以我就简单的对它进行了一层小包装。主要的视图类package com.drivingassisstantHouse.library.widget.bannerview;import android.content.Context;import android.content.res.TypedArray;import android.support.annotation.NonNull;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.animation.AccelerateInterpolator;import android.view.animation.Interpolator;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.Scroller;import com.drivingassisstantHouse.library.R;import com.drivingassisstantHouse.library.tools.SLog;import com.drivingassisstantHouse.library.tools.ToolUnit;import java.lang.reflect.Field;import java.util.ArrayList;/* * 包名：com.drivingassisstantHouse.library.widget.bannerview * 描述：广告banner * 创建者：yankebin * 日期：2016/2/27 */public class BannerView extends RelativeLayout public static final int BANNER_TYPE_GUIDE = 1; public static final int BANNER_TYPE_ADVERT = BANNER_TYPE_GUIDE + 1; protected int type = BANNER_TYPE_GUIDE; private BaseBannerViewpager viewPager; private LinearLayout indicator; private boolean isAutoLoop = false; private long loopDelayTime = 4000; private long scrollDuration=1200; private ArrayList dots = new ArrayList(); public BannerView(Context context) super(context); init(); public BannerView(Context context, AttributeSet attrs) super(context, attrs); TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.BannerView); type = typedArray.getInt(R.styleable.BannerView_bannerType, BANNER_TYPE_GUIDE); isAutoLoop = typedArray.getBoolean(R.styleable.BannerView_autoPlay, false); loopDelayTime = typedArray.getInt(R.styleable.BannerView_loopTime, 4000); scrollDuration=typedArray.getInt(R.styleable.BannerView_scrollDuration, 1200); if (null != typedArray) typedArray.recycle(); init(); Override protected void onVisibilityChanged(NonNull View changedView, int visibility) super.onVisibilityChanged(changedView, visibility); if (visibility != VISIBLE) removeCallbacks(autoRunner); else if (isAutoLoop) startAutoPlay(); private Runnable autoRunner = new Runnable() Override public void run() if (!isAutoLoop) return; int position=viewPager.getCurrentItem(); viewPager.setCurrentItem(+position, true); postDelayed(this, loopDelayTime); ; private Runnable indicatorRunner=new Runnable() Override public void run() int currentPosition = viewPager.getCurrentItem(); for (int i = 0; i dots.size(); i+) ImageView imageView = dots.get(i); if (currentPosition % dots.size() = i) imageView.setImageResource(R.drawable.banner_dot_shape_selected); else imageView.setImageResource(R.drawable.banner_dot_shape_normal); ; public void setIsAutoLoop(boolean isLoop) this.isAutoLoop = isLoop; public boolean isAutoLoop() return isAutoLoop; public void setBannerAdapter(PagerAdapter adapter) viewPager.setAdapter(adapter); private void init() viewPager = new BaseBannerViewpager(getContext(); viewPager.setLayoutParams(new LayoutParams(-1, -1); indicator = new LinearLayout(getContext(); LayoutParams params = new LayoutParams(-2, -2); params.addRule(ALIGN_PARENT_BOTTOM); params.addRule(CENTER_HORIZONTAL); params.bottomMargin = 10; indicator.setLayoutParams(params); indicator.setOrientation(LinearLayout.HORIZONTAL); addView(viewPager); addView(indicator); initPagerListener(); private void initPagerListener() viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) Override public void onPageSelected(int position) changeDotsColors(); Override public void onPageScrollStateChanged(int state) ); private void initDots(int size) if (size = 0) throw new IllegalArgumentException(size必须大于0); removeCallbacks(autoRunner); dots.clear(); LinearLayout.LayoutParams pointViewParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); pointViewParams.setMargins(ToolUnit.dipTopx(8), 0, ToolUnit.dipTopx(8), ToolUnit.dipTopx(8); for (int i = 0; i 0) ViewPager pager = (ViewPager) findViewById(childId); if (pager != null) pager.requestDisallowInterceptTouchEvent(true); return super.onInterceptTouchEvent(event); public void setAllowChildMovement(int id) this.childId = id; Override public void setAdapter(PagerAdapter adapter) initDots(BaseBannerPagerAdapter)adapter).getRealCount(); super.setAdapter(adapter); viewpager的adapterpackage com.drivingassisstantHouse.library.widget.bannerview;import android.util.SparseArray;import android.view.View;import android.view.ViewGroup;import java.util.ArrayList;/* * 包名：com.simpletour.client.activity * 描述：banner适配器 * 创建者：yankebin * 日期：2016/2/27 */public abstract class BaseBannerPagerAdapter extends android.support.v4.view.PagerAdapter protected SparseArray views = new SparseArray(); private boolean isLoop; protected ArrayList datas; public BaseBannerPagerAdapter() datas = new ArrayList(); public BaseBannerPagerAdapter(ArrayList datas) this.datas = datas; Override public final int getCount() return isLoop ? Integer.MAX_VALUE : datas.size(); Override public Object instantiateItem(ViewGroup container, int position) position = position % datas.size(); View view = views.get(position); if (view = null) view = newView(position % getCount(); views.put(position, view); container.addView(view); return view; public void notifyUpdateView(int position) View view = updateView(views.get(position), position); views.put(ition, view); notifyDataSetChanged(); public View updateView(View view, int position) return view; public abstract View newView(int position); public final int getRealCount() return datas.size(); public void subscribe(BannerView bannerView) isLoop =bannerView.isAutoLoop()| bannerView.type = BannerView.BANNER_TYPE_ADVERT; bannerView.setBannerAdapter(this); 一些自定义属性 代码里调用首先定义好xml文件android:orientation=vertical android:layout_width=match_parent android:layout_height=match_parent 其次实现BaseBannerPagerAdapter private class MBannerPagerAdapter extends BaseBannerPagerAdapter public MBannerPagerAdapter() super(imageUrlList); initImageLoader(); private void initImageLoader() Override public boolean isViewFromObject(View view, Object object) return null != object & object = view; Override public void destroyItem(ViewGroup container, int position, Object object) container.removeView(views.get(position % views.size(); Override public View newView(final int position) ImageView imageView = new ImageView(GuideActivity.this); imageView.setLayoutParams(new ViewGroup