android轮播图组件的制作方法 android轮播图组件的制作方法

本文实例为大家分享了android轮播图组件的制作方法，供大家参考，具体内容如下
BannerLayout

package com.coral3.common_module.components; import android.content.Context; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.LinearLayout; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.viewpager.widget.PagerAdapter; import androidx.viewpager.widget.ViewPager; import com.coral3.common_module.R; import com.coral3.common_module.utils.LogUtil; import com.coral3.common_module.viewPager.ChildViewPager; import java.util.ArrayList; import java.util.List; import java.util.concurrent.atomic.AtomicInteger; public class BannerLayout extends LinearLayout {private Context mContext; private View view; private ChildViewPager viewPager; private ImageView indicator; private ImageView[] indicators; private Boolean isContinue = true; private ViewGroup group; private AtomicInteger index = new AtomicInteger(); private Handler handler = new Handler(new Handler.Callback(){@Overridepublic boolean handleMessage(Message message) {viewPager.setCurrentItem(message.what); return false; }}); public BannerLayout(Context context, @Nullable AttributeSet attrs) {super(context, attrs); mContext = context; initView(); initListener(); }private void initView(){view = LayoutInflater.from(mContext).inflate(R.layout.layout_banner, this); group = view.findViewById(R.id.view_indicators); viewPager = view.findViewById(R.id.view_banners); // 动态加入图片List listPics = new ArrayList<>(); ImageView img1 = new ImageView(mContext); img1.setBackgroundResource(R.drawable.banner1); listPics.add(img1); ImageView img2 = new ImageView(mContext); img2.setBackgroundResource(R.drawable.banner2); listPics.add(img2); ImageView img3 = new ImageView(mContext); img3.setBackgroundResource(R.drawable.banner3); listPics.add(img3); ImageView img4 = new ImageView(mContext); img4.setBackgroundResource(R.drawable.banner4); listPics.add(img4); ImageView img5 = new ImageView(mContext); img5.setBackgroundResource(R.drawable.banner4); listPics.add(0, img5); ImageView img0 = new ImageView(mContext); img0.setBackgroundResource(R.drawable.banner1); listPics.add(img0); //动态加入指示器indicators = new ImageView[listPics.size()]; for(int i = 0; i < indicators.length; i++){indicator = new ImageView(mContext); LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(15, 15); layoutParams.setMargins(0, 0, 10, 0); indicator.setLayoutParams(layoutParams); indicators[i] = indicator; if(i == 1){indicators[i].setBackgroundResource(R.drawable.shape_banner_checked); }else{indicators[i].setBackgroundResource(R.drawable.shape_banner_unchecked); }if(i == 0 || i == 5){indicators[i].setVisibility(View.INVISIBLE); }group.addView(indicators[i]); }viewPager.setAdapter(new MyPagerAdapter(listPics)); index.incrementAndGet(); // 轮播new Thread(new Runnable() {@Overridepublic void run() {while (true){if(isContinue){handler.sendEmptyMessage(index.get()); whatOption(); }}}}).start(); }private void initListener(){// 设置监听器viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {LogUtil.d(positionOffset + "-" + positionOffsetPixels); // 无缝滚动均滑//if(positionOffset == 0.0){//LogUtil.d(position + ""); //if(position == 5) {//viewPager.setCurrentItem(1, false); //}//if(position == 0) {//viewPager.setCurrentItem(4, false); //}//}}@Overridepublic void onPageSelected(int position) {index.getAndSet(position); if(position == 5) {viewPager.setCurrentItem(1, false); }if(position == 0) {viewPager.setCurrentItem(4, false); }for(int i = 0; i < indicators.length; i++){if(i == index.get()){indicators[i].setBackgroundResource(R.drawable.shape_banner_checked); }else{indicators[i].setBackgroundResource(R.drawable.shape_banner_unchecked); }}if(position == 0) indicators[4].setBackgroundResource(R.drawable.shape_banner_checked); if(position == 5) indicators[1].setBackgroundResource(R.drawable.shape_banner_checked); }@Overridepublic void onPageScrollStateChanged(int state) {}}); // 设置触摸时停止定时viewPager.setOnTouchListener(new View.OnTouchListener() {@Overridepublic boolean onTouch(View view, MotionEvent motionEvent) {switch (motionEvent.getAction()){case MotionEvent.ACTION_DOWN:isContinue = false; break; case MotionEvent.ACTION_UP:isContinue = true; break; }return false; }}); }class MyPagerAdapter extends PagerAdapter {private List listView; @Overridepublic int getCount() {return listView.size(); }public MyPagerAdapter(List listView){this.listView = listView; }@Overridepublic boolean isViewFromObject(@NonNull View view, @NonNull Object object) {return view == object; }@NonNull@Overridepublic Object instantiateItem(@NonNull ViewGroup container, int position) {container.addView(listView.get(position)); return listView.get(position); }@Overridepublic void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {container.removeView(listView.get(position)); }}private void whatOption(){index.incrementAndGet(); if(index.get() > indicators.length - 2){index.getAndAdd(-4); }try {Thread.sleep(3000); } catch (InterruptedException e) {e.printStackTrace(); }}}

layout_banner

ChildViewPager

package com.coral3.common_module.viewPager; import android.content.Context; import android.graphics.PointF; import android.util.AttributeSet; import android.view.MotionEvent; import androidx.viewpager.widget.ViewPager; public class ChildViewPager extends ViewPager {/** 触摸时按下的点 **/PointF downP = new PointF(); /** 触摸时当前的点 **/PointF curP = new PointF(); public ChildViewPager(Context context) {super(context); }public ChildViewPager(Context context, AttributeSet attrs) {super(context, attrs); }private static final String TAG = "ChildViewpager"; @Overridepublic boolean onTouchEvent(MotionEvent arg0) {//每次进行onTouch事件都记录当前的按下的坐标if(getChildCount()<=1){return super.onTouchEvent(arg0); }curP.x = arg0.getX(); curP.y = arg0.getY(); if(arg0.getAction() == MotionEvent.ACTION_DOWN){//记录按下时候的坐标//切记不可用 downP = curP ，这样在改变curP的时候，downP也会改变downP.x = arg0.getX(); downP.y = arg0.getY(); //此句代码是为了通知他的父ViewPager现在进行的是本控件的操作，不要对我的操作进行干扰getParent().requestDisallowInterceptTouchEvent(true); }if(arg0.getAction() == MotionEvent.ACTION_MOVE){//此句代码是为了通知他的父ViewPager现在进行的是本控件的操作，不要对我的操作进行干扰getParent().requestDisallowInterceptTouchEvent(true); }if(arg0.getAction() == MotionEvent.ACTION_UP || arg0.getAction() == MotionEvent.ACTION_CANCEL){//在up时判断是否按下和松手的坐标为一个点//如果是一个点，将执行点击事件，这是我自己写的点击事件，而不是onclickgetParent().requestDisallowInterceptTouchEvent(false); if(downP.x==curP.x && downP.y==curP.y){return true; }}super.onTouchEvent(arg0); //注意这句不能 return super.onTouchEvent(arg0); 否则触发parent滑动return true; }}

使用

【android轮播图组件的制作方法】以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。