ViewPager实现自动滑动和下面小圆点可根据图片大小来自适应

来源：互联网发布：seo技术是什么意思编辑：程序博客网时间：2024/05/13 09:52

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="5"
android:orientation="vertical" >

<LinearLayout android:id="@+id/view_pager_content"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="vertical"/>

<LinearLayout
android:id="@+id/viewGroup"
android:layout_below="@id/view_pager_content"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="-25px"
android:gravity="center_horizontal"
android:orientation="horizontal"
>
</LinearLayout>
</RelativeLayout>


</LinearLayout>

代码实现

package shuliang.han.myviewpager;

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.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

private ViewPager adViewPager;
private LinearLayout pagerLayout;
private List<View> pageViews;
private ImageView[] imageViews;
private ImageView imageView;
private AdPageAdapter adapter;
private AtomicInteger atomicInteger = new AtomicInteger(0);
private boolean isContinue = true;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

initViewPager();
}

private void initViewPager() {

//浠庡竷灞�鏂囦欢涓幏鍙朧iewPager鐖跺鍣�
pagerLayout = (LinearLayout) findViewById(R.id.view_pager_content);
//鍒涘缓ViewPager
adViewPager = new ViewPager(this);

//鑾峰彇灞忓箷鍍忕礌鐩稿叧淇℃伅
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

//鏍规嵁灞忓箷淇℃伅璁剧疆ViewPager骞垮憡瀹瑰櫒鐨勫楂�
adViewPager.setLayoutParams(new LayoutParams(dm.widthPixels, dm.heightPixels * 5 / 5));

//灏哣iewPager瀹瑰櫒璁剧疆鍒板竷灞�鏂囦欢鐖跺鍣ㄤ腑
pagerLayout.addView(adViewPager);

initPageAdapter();

initCirclePoint();

adViewPager.setAdapter(adapter);
adViewPager.setOnPageChangeListener(new AdPageChangeListener());

new Thread(new Runnable() {
@Override
public void run() {
while (true) {
if (isContinue) {
viewHandler.sendEmptyMessage(atomicInteger.get());
atomicOption();
}
}
}
}).start();
}

private void atomicOption() {
atomicInteger.incrementAndGet();
if (atomicInteger.get() > imageViews.length - 1) {
atomicInteger.getAndAdd(-5);
}
try {
Thread.sleep(3000);
} catch (InterruptedException e) {

}
}

/*
* 姣忛殧鍥哄畾鏃堕棿鍒囨崲骞垮憡鏍忓浘鐗�
*/
private final Handler viewHandler = new Handler() {

@Override
public void handleMessage(Message msg) {
adViewPager.setCurrentItem(msg.what);
super.handleMessage(msg);
}

};

private void initPageAdapter() {
pageViews = new ArrayList<View>();

ImageView img1 = new ImageView(this);
img1.setBackgroundResource(R.drawable.view_add_1);
pageViews.add(img1);

ImageView img2 = new ImageView(this);
img2.setBackgroundResource(R.drawable.view_add_2);
pageViews.add(img2);

ImageView img3 = new ImageView(this);
img3.setBackgroundResource(R.drawable.view_add_3);
pageViews.add(img3);

ImageView img4 = new ImageView(this);
img4.setBackgroundResource(R.drawable.view_add_4);
pageViews.add(img4);

ImageView img5 = new ImageView(this);
img5.setBackgroundResource(R.drawable.view_add_5);
pageViews.add(img5);

ImageView img6 = new ImageView(this);
img6.setBackgroundResource(R.drawable.view_add_6);
pageViews.add(img6);

adapter = new AdPageAdapter(pageViews);
}

private void initCirclePoint(){
ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);
imageViews = new ImageView[pageViews.size()];
//骞垮憡鏍忕殑灏忓渾鐐瑰浘鏍�
for (int i = 0; i < pageViews.size(); i++) {
//鍒涘缓涓�涓狪mageView, 骞惰缃楂�. 灏嗚瀵硅薄鏀惧叆鍒版暟缁勪腑
imageView = new ImageView(this);
imageView.setLayoutParams(new LayoutParams(10,10));
imageViews[i] = imageView;

//鍒濆鍊�, 榛樿绗�0涓�変腑
if (i == 0) {
imageViews[i]
.setBackgroundResource(R.drawable.point_focused);
} else {
imageViews[i]
.setBackgroundResource(R.drawable.point_unfocused);
}
//灏嗗皬鍦嗙偣鏀惧叆鍒板竷灞�涓�
group.addView(imageViews[i]);
}
}

/**
* ViewPager 椤甸潰鏀瑰彉鐩戝惉鍣�
*/
private final class AdPageChangeListener implements OnPageChangeListener {

/**
* 椤甸潰婊氬姩鐘舵�佸彂鐢熸敼鍙樼殑鏃跺�欒Е鍙�
*/
@Override
public void onPageScrollStateChanged(int arg0) {
}

/**
* 椤甸潰婊氬姩鐨勬椂鍊欒Е鍙�
*/
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}

/**
* 椤甸潰閫変腑鐨勬椂鍊欒Е鍙�
*/
@Override
public void onPageSelected(int arg0) {
//鑾峰彇褰撳墠鏄剧ず鐨勯〉闈㈡槸鍝釜椤甸潰
atomicInteger.getAndSet(arg0);
//閲嶆柊璁剧疆鍘熺偣甯冨眬闆嗗悎
for (int i = 0; i < imageViews.length; i++) {
imageViews[arg0]
.setBackgroundResource(R.drawable.point_focused);
if (arg0 != i) {
imageViews[i]
.setBackgroundResource(R.drawable.point_unfocused);
}
}
}
}

private final class AdPageAdapter extends PagerAdapter {
private List<View> views = null;

/**
* 鍒濆鍖栨暟鎹簮, 鍗砎iew鏁扮粍
*/
public AdPageAdapter(List<View> views) {
this.views = views;
}

/**
* 浠嶸iewPager涓垹闄ら泦鍚堜腑瀵瑰簲绱㈠紩鐨刅iew瀵硅薄
*/
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView(views.get(position));
}

/**
* 鑾峰彇ViewPager鐨勪釜鏁�
*/
@Override
public int getCount() {
return views.size();
}

/**
* 浠嶸iew闆嗗悎涓幏鍙栧搴旂储寮曠殑鍏冪礌, 骞舵坊鍔犲埌ViewPager涓�
*/
@Override
public Object instantiateItem(View container, int position) {
((ViewPager) container).addView(views.get(position), 0);
return views.get(position);
}

/**
* 鏄惁灏嗘樉绀虹殑ViewPager椤甸潰涓巌nstantiateItem杩斿洖鐨勫璞¤繘琛屽叧鑱�
* 杩欎釜鏂规硶鏄繀椤诲疄鐜扮殑
*/
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
}

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