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自定义轮播图，通过ViewPager实现，准备自定义成一个简单框架实现轮播的各种效果。代码如下：
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
private TextView tv_intro;
private ArrayList<Ad> list= new ArrayList<>();
private LinearLayout dot_layout;
public String[] shape = new String[]{"oval","rect","ring"};
private String type = "ring";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initView();
initData();
initListener();
}
private void initListener() {
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
updateIntroAndDot();
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
private void initData() {
list.add(new Ad(R.mipmap.a,"巩俐不低俗，我就不低俗"));
list.add(new Ad(R.mipmap.b,"朴树又回来了，再唱经典老歌,再唱经典老歌再唱经典老歌"));
list.add(new Ad(R.mipmap.c,"揭秘北京电影如何升级"));
list.add(new Ad(R.mipmap.d,"乐视版TV大放送"));
list.add(new Ad(R.mipmap.e,"热血屌丝的反杀"));
initDots();
viewPager.setAdapter(new MyPagerAdapter());
int centerValue = Integer.MAX_VALUE/2;
int value = centerValue%list.size();
viewPager.setCurrentItem(centerValue-value);
updateIntroAndDot();
}
private void initView() {
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewPager);
tv_intro = (TextView) findViewById(R.id.tv_intro);
dot_layout= (LinearLayout) findViewById(R.id.dot_layout);
}
private void initDots(){
for(int i = 0;i<list.size();i++){
if(shape[0]==type){
View view = new View(this);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(16,16);
if(i!=0){
param.leftMargin = 18;
}
view.setLayoutParams(param);
view.setBackgroundResource(R.drawable.selector_dot_oval);
dot_layout.addView(view);
}else if(shape[1]==type){
View view = new View(this);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(32,12);
if(i!=0){
param.leftMargin = 18;
}
view.setLayoutParams(param);
view.setBackgroundResource(R.drawable.selector_dot_rect);
dot_layout.addView(view);
}else if(shape[2]==type){
View view = new View(this);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(16,16);
if(i!=0){
param.leftMargin = 18;
}
view.setLayoutParams(param);
view.setBackgroundResource(R.drawable.selector_dot_ring);
dot_layout.addView(view);
}
}
}
private void updateIntroAndDot(){
int currentPage = viewPager.getCurrentItem()%list.size();
tv_intro.setText(list.get(currentPage).getIntro());
for(int i = 0;i<dot_layout.getChildCount();i++){
dot_layout.getChildAt(i).setEnabled(i==currentPage);
}
}
class MyPagerAdapter extends PagerAdapter{
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
/*
返回true表示不去创建使用缓存，返回false表示重新创建
*/
@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}
/*
类似于BaseAdapter的getView方法
*/
@Override
public Object instantiateItem(ViewGroup container, int position) {
View view = View.inflate(MainActivity.this,R.layout.adapter_ad,null);
ImageView imageview = (ImageView) view.findViewById(R.id.image);
Ad ad = list.get(position%list.size());
imageview.setImageResource(ad.getIconResId());
container.addView(view);
return view;
}
/*
销毁page
*/
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// super.destroyItem(container, position, object);
container.removeView((View) object);
}
}
}public class Ad {
private int iconResId;
private String intro;
public Ad(int iconResId, String intro) {
this.iconResId = iconResId;
this.intro = intro;
}
public int getIconResId() {
return iconResId;
}
public void setIconResId(int iconResId) {
this.iconResId = iconResId;
}
public String getIntro() {
return intro;
}
public void setIntro(String intro) {
this.intro = intro;
}
}<?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="net.xiaolu.italker.bigmap.MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="200dp">
</android.support.v4.view.ViewPager>
<LinearLayout
android:layout_alignBottom="@id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#77000000"
android:gravity="center_horizontal"
android:padding="8dp"
android:orientation="vertical"
>
<TextView
android:id="@+id/tv_intro"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textColor="@color/text_des_color"
android:textSize="@dimen/text_des_size"
android:lines="1"
android:focusable="true"
android:marqueeRepeatLimit="marquee_forever"
android:ellipsize="marquee"
android:text="@string/image_des_text"
/>
<LinearLayout
android:id="@+id/dot_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
</LinearLayout>
</LinearLayout>
</RelativeLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@mipmap/a"
/>
</LinearLayout>代码下载github 完整代码下载