带指示点Viewpaper图片轮播 博客分类: Android androidviewpaper图片轮播
程序员文章站
2024-03-26 10:53:47
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功能:带指示点Viewpaper图片轮播(无限轮播)
效果图:
主要实现代码:
package com.eyeandroid.viewpager; import java.util.ArrayList; import java.util.List; import java.util.concurrent.atomic.AtomicInteger; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends Activity { private ImageView[] imageViews = null;//用于显示指示点 private ImageView imageView = null; private ViewPager advPager = null; //AtomicInteger,一个提供原子操作的Integer的类。 //在Java语言中,++i和i++操作并不是线程安全的, //在使用的时候,不可避免的会用到synchronized关键字。而AtomicInteger则通过一种线程安全的加减操作接口。 private AtomicInteger what = new AtomicInteger(0); private boolean isContinue = true;//判断是否轮播 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initViewPager(); } private void initViewPager() { advPager = (ViewPager) findViewById(R.id.adv_pager); ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup); //用于存放轮播的图片 List<View> advPics = new ArrayList<View>(); ImageView img1 = new ImageView(this); img1.setBackgroundResource(R.drawable.pic1); advPics.add(img1); ImageView img2 = new ImageView(this); img2.setBackgroundResource(R.drawable.pic2); advPics.add(img2); ImageView img3 = new ImageView(this); img3.setBackgroundResource(R.drawable.pic3); advPics.add(img3); ImageView img4 = new ImageView(this); img4.setBackgroundResource(R.drawable.pic4); advPics.add(img4); imageViews = new ImageView[advPics.size()]; for (int i = 0; i < advPics.size(); i++) { imageView = new ImageView(this); imageView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); imageViews[i] = imageView; if (i == 0) { imageViews[i].setBackgroundResource(R.drawable.advertising_point_h); } else { imageViews[i].setBackgroundResource(R.drawable.advertising_point); } group.addView(imageViews[i]); } advPager.setAdapter(new AdvAdapter(advPics)); advPager.setOnPageChangeListener(new GuidePageChangeListener()); advPager.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: isContinue = false; break; case MotionEvent.ACTION_UP: isContinue = true; break; default: isContinue = true; break; } return false; } }); new Thread(new Runnable() { @Override public void run() { while (true) { if (isContinue) { viewHandler.sendEmptyMessage(what.get()); whatOption(); } } } }).start(); } private void whatOption() { //获取当前的值,并自增 what.incrementAndGet(); if (what.get() > imageViews.length - 1) { //获取当前的值,并减少 what.getAndAdd(-imageViews.length); } try { Thread.sleep(2000); } catch (InterruptedException e) { } } private final Handler viewHandler = new Handler() { @Override public void handleMessage(Message msg) { advPager.setCurrentItem(msg.what); super.handleMessage(msg); } }; private final class GuidePageChangeListener implements OnPageChangeListener { @Override public void onPageScrollStateChanged(int arg0) { } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageSelected(int arg0) { what.getAndSet(arg0); for (int i = 0; i < imageViews.length; i++) { imageViews[arg0] .setBackgroundResource(R.drawable.advertising_point_h); if (arg0 != i) { imageViews[i] .setBackgroundResource(R.drawable.advertising_point); } } } } private final class AdvAdapter extends PagerAdapter { private List<View> views = null; public AdvAdapter(List<View> views) { this.views = views; } @Override public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView(views.get(arg1)); } @Override public void finishUpdate(View arg0) { } @Override public int getCount() { return views.size(); } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(views.get(arg1), 0); views.get(arg1).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this,"选中了第"+advPager.getCurrentItem()+"张图片" , Toast.LENGTH_SHORT).show(); } }); return views.get(arg1); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) { } } }
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" > <android.support.v4.view.ViewPager android:id="@+id/adv_pager" android:layout_width="fill_parent" android:layout_height="160dp" > </android.support.v4.view.ViewPager> <LinearLayout android:id="@+id/viewGroup" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:paddingBottom="2dp" android:gravity="center" android:orientation="horizontal" > </LinearLayout> </FrameLayout>