Android首页轮播图直接拿来用
import java.util.ArrayList;import java.util.List;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;import android.content.Context;import android.os.Handler;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.util.AttributeSet;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.LinearLayout;import android.widget.RelativeLayout;public class HeadAD extends RelativeLayout { private ViewPager vp; private LinearLayout symbolLayout, bottomLayout; private LayoutParams lp; // private ArrayList<imageview> symbolViews; private List<viewpagerbean> showResults; private boolean isContinue = true; private int currentItem = 0; // 当前图片的索引号 private ScheduledExecutorService updateService; private Context context; public void initData(List<viewpagerbean> pResult) { showResults = pResult; } public HeadAD(Context context, AttributeSet attrs) { super(context, attrs); this.context = context; // setBackgroundResource(R.color.black); } public void initView(Context context) { // TODO Auto-generated method stub lp = new LayoutParams(LayoutParams.MATCH_PARENT, DensityUtil.dip2px( context, 180)); vp = new ViewPager(context); vp.setLayoutParams(lp); lp = new LayoutParams(LayoutParams.MATCH_PARENT, DensityUtil.dip2px( context, 20)); lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); bottomLayout = new LinearLayout(context); bottomLayout.setGravity(Gravity.CENTER); bottomLayout.setOrientation(LinearLayout.VERTICAL); bottomLayout.setLayoutParams(lp); bottomLayout.setBackgroundResource(R.color.footerBg); lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); symbolLayout = new LinearLayout(context); symbolLayout.setGravity(Gravity.CENTER); symbolLayout.setOrientation(LinearLayout.HORIZONTAL); symbolLayout.setPadding(0, 0, 5, 5); ImageView symbolIv; for (int i = 0; i < showResults.size(); i++) { if (showResults.size() > 1) { symbolIv = new ImageView(context); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); params.rightMargin = 10; symbolIv.setBackgroundResource(R.drawable.point_bg); symbolIv.setEnabled(false); if (i == 0) { symbolIv.setEnabled(true); } else { symbolIv.setEnabled(false); } symbolIv.setLayoutParams(params); symbolLayout.addView(symbolIv); } } bottomLayout.addView(symbolLayout); adapter = new ViewPagerAdapter(context, showResults); vp.setAdapter(adapter); vp.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: isContinue = false; break; case MotionEvent.ACTION_MOVE: isContinue = false; break; case MotionEvent.ACTION_UP: isContinue = true; break; case MotionEvent.ACTION_CANCEL: break; } return false; } }); vp.setOnPageChangeListener(new MyPageChangeListener()); addView(vp); addView(bottomLayout); } private Handler viewPagerHandler = new Handler() { public void handleMessage(android.os.Message msg) { vp.setCurrentItem(currentItem % showResults.size());// 切换当前显示的图片 }; }; public ViewPagerAdapter adapter; // 直接在activity的OnResume里调用，当前界面是该activity时开始循环 public void startUpdate() { this.updateService = Executors.newSingleThreadScheduledExecutor(); this.updateService.scheduleAtFixedRate(new ScrollTask(), 5, 5, TimeUnit.SECONDS); } // 直接在activity的OnPause里调用，当前界面不是该activity时停止循环 public void stopUpdate() { this.updateService.shutdown(); updateService = null; } /** * 当ViewPager中页面的状态发生改变时调用 * * */ private class MyPageChangeListener implements OnPageChangeListener { private int oldPosition = 0; public void onPageSelected(int position) { currentItem = position % showResults.size(); symbolLayout.getChildAt(oldPosition).setEnabled(false); symbolLayout.getChildAt(position).setEnabled(true); oldPosition = position; } public void onPageScrollStateChanged(int arg0) { } public void onPageScrolled(int arg0, float arg1, int arg2) { } } /** * 换行切换任务 * * @author Administrator * */ private class ScrollTask implements Runnable { public void run() { if (isContinue) { synchronized (vp) { System.out.println("currentItem: " + currentItem); currentItem = (currentItem + 1) % showResults.size(); viewPagerHandler.obtainMessage().sendToTarget(); // 通过Handler切换图片 } } } }}</viewpagerbean></viewpagerbean></imageview> |
HEADAD 实现了自定轮播计时。
下面看adapter写法 删除了部分项目逻辑
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import java.util.List;import android.content.Context;import android.content.Intent;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.ImageView;import com.nostra13.universalimageloader.core.DisplayImageOptions;/******************************************************* * * ********************************************************/public class ViewPagerAdapter extends PagerAdapter { List<viewpagerbean> lists; Context ct; private ImageView imgView; private int currentPosition = 0; private DisplayImageOptions options; public ViewPagerAdapter(Context ct, List<viewpagerbean> mList) { lists = mList; this.ct = ct; options = new DisplayImageOptions.Builder().cacheInMemory(true) .cacheOnDisk(true) .showImageOnLoading(R.drawable.default_news_logo).build(); } /** * 获得页面的总数 */ public int getCount() { return lists.size(); } /** * 获得相应位置上的view container view的容器 */ public Object instantiateItem(ViewGroup container, final int position) { // imgView.setOnClickListener(this); imgView = new ImageView(ct); imgView.setScaleType(ImageView.ScaleType.FIT_XY); if (lists.size() == 0) { } else { //写自己的逻辑 currentPosition = position % lists.size(); } // 给 container 添加一个view container.addView(imgView); // 返回一个和该view相对的object return imgView; } /** * 判断 view和object的对应关系 */ public boolean isViewFromObject(View view, Object object) { if (view == object) { return true; } else { return false; } } /** * 销毁对应位置上的object */ public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); object = null; } @Override public int getItemPosition(Object object) { // TODO Auto-generated method stub return super.getItemPosition(object); }}</viewpagerbean></viewpagerbean> |
实体bean这里就不贴了
用到工具类 ......还有几个不重要就不贴了
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import android.content.Context;public class DensityUtil { /** * 根据手机的分辨率从 dip 的单位 转成为 px(像素) */ public static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } /** * 根据手机的分辨率从 px(像素) 的单位 转成为 dp */ public static int px2dip(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); }} |
如何调用：
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mViewPager = new HeadAD(getActivity(), null); mViewPager.initData(viewPagerLists); mViewPager.initView(getActivity()); |
就这样就OK了。
