Android首頁輪播圖直接拿來用

Android首頁輪播圖直接拿來用

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 symbolViews;private List showResults;private boolean isContinue = true;private int currentItem = 0; // 當前圖片的索引號private ScheduledExecutorService updateService;private Context context;public void initData(List 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 stublp = 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() {@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubswitch (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());// 切換當前顯示的圖片};};public ViewPagerAdapter adapter;// 直接在activity的OnResume裡調用，當前介面是該activity時開始迴圈public void startUpdate() {this.updateService = Executors.newSingleThreadScheduledExecutor();this.updateService.scheduleAtFixedRate(new ScrollTask(), 5, 5,TimeUnit.SECONDS);}// 直接在activity的OnPause裡調用，當前介面不是該activity時停止迴圈public void stopUpdate() {this.updateService.shutdown();updateService = null;}/** * 當ViewPager中頁面的狀態發生改變時調用 *  *  */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) {}}/** * 換行切換任務 *  * @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(); // 通過Handler切換圖片}}}}}

HEADAD 實現了自定輪播計時。

下面看adapter寫法 刪除了部分項目邏輯

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 lists;Context ct;private ImageView imgView;private int currentPosition = 0;private DisplayImageOptions options;public ViewPagerAdapter(Context ct, List mList) {lists = mList;this.ct = ct;options = new DisplayImageOptions.Builder().cacheInMemory(true).cacheOnDisk(true).showImageOnLoading(R.drawable.default_news_logo).build();}/** * 獲得頁面的總數 */public int getCount() {return lists.size();}/** * 獲得相應位置上的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 {//寫自己的邏輯currentPosition = position % lists.size();}// 給 container 添加一個viewcontainer.addView(imgView);// 返回一個和該view相對的objectreturn imgView;}/** * 判斷 view和object的對應關係 */public boolean isViewFromObject(View view, Object object) {if (view == object) {return true;} else {return false;}}/** * 銷毀對應位置上的object */public void destroyItem(ViewGroup container, int position, Object object) {container.removeView((View) object);object = null;}@Overridepublic int getItemPosition(Object object) {// TODO Auto-generated method stubreturn super.getItemPosition(object);}}

實體bean這裡就不貼了

用到工具類 ......還有幾個不重要就不貼了

import android.content.Context;public class DensityUtil {/** * 根據手機的解析度從 dip 的單位 轉成為 px(像素) */public static int dip2px(Context context, float dpValue) {final float scale = context.getResources().getDisplayMetrics().density;return (int) (dpValue * scale + 0.5f);}/** * 根據手機的解析度從 px(像素) 的單位 轉成為 dp */public static int px2dip(Context context, float pxValue) {final float scale = context.getResources().getDisplayMetrics().density;return (int) (pxValue / scale + 0.5f);}}

如何調用：

mViewPager = new HeadAD(getActivity(), null);mViewPager.initData(viewPagerLists);mViewPager.initView(getActivity());

就這樣就OK了。