效果图：
布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="200dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/viewpager"
android:background="#33000000"
android:orientation="vertical">
<TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="广告条"
android:textColor="@android:color/white"
android:textSize="18sp" />
<LinearLayout
android:id="@+id/point_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:orientation="horizontal"></LinearLayout>
</LinearLayout>
</RelativeLayout>
指示点：
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<size
android:width="5dp"
android:height="5dp" />
<solid android:color="#aaFFFFFF" />
</shape><?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<size android:width="5dp" android:height="5dp" />
<solid android:color="#ff0000" />
</shape><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/point_focured" android:state_enabled="true" />
<item android:drawable="@drawable/point_normal" />
</selector>activity:
package com.example.xyh.banner;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* 广告轮播
*/
public class MainActivity extends AppCompatActivity {
private ViewPager mViewPager;
private TextView tvTitle;
private LinearLayout pointGroup;
private List<ImageView> list;
// 上一个页面的位置
protected int lastPosition;
// 图片资源ID
private final int[] imageIds = {R.drawable.a, R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.e};
//图片标题集合
private final String[] title = {
"巩俐不低俗，我就不能低俗",
"扑树又回来啦！再唱经典老歌引万人大合唱",
"揭秘北京电影如何升级",
"乐视网TV版大派送",
"热血屌丝的反杀"
};
//判断是否在自动滚动
private boolean isRunning = false;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
//让viewPager 滑动到下一页
mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
if (isRunning) {
// 继续发送延时2 秒的消息, 形成类似递归的效果, 使广告一直循环切换
mHandler.sendEmptyMessageDelayed(0, 3000);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViews();
init();
initListener();
isRunning = true;
mHandler.sendEmptyMessageDelayed(0, 3000);
}
private void init() {
list = new ArrayList<>();
for (int i = 0; i < imageIds.length; i++) {
ImageView imageView = new ImageView(this);
imageView.setBackgroundResource(imageIds[i]);
list.add(imageView);
//动态添加指示点
ImageView point = new ImageView(this);
point.setBackgroundResource(R.drawable.point_bg);
pointGroup.addView(point);
//布局参数
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
if (i > 0) {
params.leftMargin = 20;
}
point.setLayoutParams(params); //设置布局参数
if (i == 0) {
point.setEnabled(true);
} else {
point.setEnabled(false);
}
}
MyPagerAdapter myPagerAdapter = new MyPagerAdapter(list);
mViewPager.setAdapter(myPagerAdapter);
tvTitle.setText(title[0]);
//把当前页面设置为中间的，这样左右都有很多页面
mViewPager.setCurrentItem(Integer.MAX_VALUE / 2 - (Integer.MAX_VALUE / 2 % list.size()));
}
private void initListener() {
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
position = position % list.size();
//设置指示点状态
pointGroup.getChildAt(position).setEnabled(true);
pointGroup.getChildAt(lastPosition).setEnabled(false);
lastPosition = position;
tvTitle.setText(title[position]);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
private void findViews() {
mViewPager = (ViewPager) findViewById(R.id.viewpager);
tvTitle = (TextView) findViewById(R.id.tv_title);
pointGroup = (LinearLayout) findViewById(R.id.point_group);
}
@Override
protected void onDestroy() {
super.onDestroy();
isRunning = false;
}
}
适配器：
package com.example.xyh.banner;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import java.util.List;
/**
* Created by xiaoyehai on 2018/5/22/022.
*/
public class MyPagerAdapter extends PagerAdapter {
private List<ImageView> list;
public MyPagerAdapter(List<ImageView> list) {
this.list = list;
}
@Override
public int getCount() {
//return list.size();
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView = list.get(position % list.size());
container.addView(imageView);
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
object = null;
}
}
图片轮播也可以采用计时器的方式实现