Android：用ViewPager实现广告栏
来源：程序员人生 发布时间：2015-03-06 08:51:15 阅读次数：4270次
现在常见的广告栏效果，自动切换广告，也可手动滑动切换。
我用ViewPager实现的，空话不多说，上代码：
1、布局文件 layout_ad_pager.xml
<?xml version="1.0" encoding="utf⑻"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="160dp"
android:baselineAligned="false" >
<ImageView
android:id="@+id/home_default_image"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="@drawable/home_log_default"
android:visibility="gone" />
<android.support.v4.view.ViewPager
android:id="@+id/adv_pager"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/img2" >
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="@+id/viewGroup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|bottom"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="horizontal" >
</LinearLayout>
</FrameLayout>
2、主要代码 AdPagerMainActivity.java
package app.adpager;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class AdPagerMainActivity extends ActionBarActivity {
private ImageView mDefaultImage = null;
private ViewPager mImagePager = null;
private ImageView[] mImageViews = null;
private AtomicInteger what = new AtomicInteger(0);
private boolean isContinue = true;
private List<View> advPics;
private Context mContext;
private ImageView mImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.layout_ad_pager);
init();
initView();
initViewPager();
}
/**
* 初始化数据
*/
private void init() {
mContext = this;
advPics = new ArrayList<View>();
}
/**
* 初始化控件
*/
private void initView() {
// TODO Auto-generated method stub
mDefaultImage = (ImageView) findViewById(R.id.home_default_image);
mImagePager = (ViewPager) findViewById(R.id.adv_pager);
}
/**
* void
*/
private void initViewPager() {
// TODO Auto-generated method stub
mDefaultImage.setVisibility(View.GONE);
mImagePager.setVisibility(View.VISIBLE);
ImageView img1 = new ImageView(mContext);
img1.setBackgroundResource(R.drawable.img1);
advPics.add(img1);
ImageView img2 = new ImageView(mContext);
img2.setBackgroundResource(R.drawable.img2);
advPics.add(img2);
ImageView img3 = new ImageView(mContext);
img3.setBackgroundResource(R.drawable.img3);
advPics.add(img3);
ImageView img4 = new ImageView(mContext);
img4.setBackgroundResource(R.drawable.img4);
advPics.add(img4);
// group是R.layou.mainview中的负责包裹小圆点的LinearLayout.
ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);
mImageViews = new ImageView[advPics.size()];
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(13, 13);
layoutParams.setMargins(5, 0, 5, 1);
for (int i = 0; i < advPics.size(); i++) {
mImageView = new ImageView(this);
mImageView.setLayoutParams(layoutParams);
mImageViews[i] = mImageView;
if (i == 0) {
// 默许选中第1张图片
mImageViews[i].setBackgroundResource(R.drawable.item_focus);
}
else {
mImageViews[i].setBackgroundResource(R.drawable.item_unfocus);
}
group.addView(mImageViews[i]);
}
mImagePager.setAdapter(new AdvAdapter(advPics));
mImagePager.setOnPageChangeListener(new GuidePageChangeListener());
// 按下时不继续定时滑动,弹起时继续定时滑动
mImagePager.setOnTouchListener(new View.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;
}
});
// 定时滑动线程
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
if (isContinue) {
viewHandler.sendEmptyMessage(what.get());
whatOption();
}
}
}
}).start();
}
/**
* 操作圆点轮换变背景
*/
private void whatOption() {
what.incrementAndGet();
if (what.get() > mImageViews.length - 1) {
what.getAndAdd(-mImageViews.length);
}
try {
if (what.get() == 1) {
Thread.sleep(3000);
}
else {
Thread.sleep(2000);
}
}
catch (InterruptedException e) {
}
}
/**
* 处理定时切换广告栏图片的句柄
*/
@SuppressLint("HandlerLeak")
private final Handler viewHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
mImagePager.setCurrentItem(msg.what);
super.handleMessage(msg);
}
};
/** 指引页面改监听器 */
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) {
arg0 = arg0 % advPics.size();
for (int i = 0; i < mImageViews.length; i++) {
mImageViews[arg0].setBackgroundResource(R.drawable.item_focus);
if (arg0 != i) {
mImageViews[i].setBackgroundResource(R.drawable.item_unfocus);
}
}
what.set(arg0);
}
}
/**
* @Description: 广告栏PaperView 图片适配器
*/
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);
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) {
}
}
}
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