自定义Banner继承RelativeLayout public class Banner extends RelativeLayout implements ViewPager.OnPageChangeListener {
RelativeLayout container;
ViewPager pager;
LinearLayout points;
private int duration, currentIndex;
private List<ImageView> indicators = new ArrayList<>();
public Banner(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
View view= inflate(context, R.layout.common_view_banner, this);
container = view.findViewById(R.id.common_view_banner_container);
pager= view.findViewById(R.id.common_view_banner_pager);
points= view.findViewById(R.id.common_view_banner_points);
//获取自定义的属性
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.Banner);
duration = array.getInt(R.styleable.Banner_banner_duration, 3000);//间隔
ViewGroup.LayoutParams layoutParams = container.getLayoutParams();
layoutParams.height = DimensUtil.dip2px(array.getInt(R.styleable.Banner_banner_height, 160));//高度
container.setLayoutParams(layoutParams);
setClickable(true);
array.recycle();
FixedSpeedScroller.setViewPagerDuration(pager, 100);
}
@Override
public void onPageScrolled(int i, float v, int i1) {
}
@Override
public void onPageSelected(int i) {
currentIndex = i;
for (ImageView indicator : indicators) indicator.setPressed(false);
indicators.get(currentIndex % indicators.size()).setPressed(true);
}
@Override
public void onPageScrollStateChanged(int i) {
switch (i) {
case ViewPager.SCROLL_STATE_IDLE:
//完全空闲状态
start();
break;
default:
stop();
break;
}
}
//用的Fastjson
public void initData(JSONArray array) {
if (array == null || array.size() == 0) {
throw new IllegalArgumentException("传入参数不能为空");
}
LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.setMargins(10, 10, 10, 10);
for (int i = 0; i < array.size(); i++) {
ImageView indicator = new ImageView(ContextHolder.context);
indicator.setImageResource(R.drawable.common_indicator_point);
indicator.setLayoutParams(params);
indicator.setPressed(i == 0);
points.addView(indicator);
indicators.add(indicator);
}
pager.setAdapter(new BannerPagerAdapter(array));
pager.setPageTransformer(true, new GalleryTransformer());
pager.addOnPageChangeListener(this);
}
public void start() {
handler.sendEmptyMessageDelayed(0, duration);
}
public void stop() {
handler.removeMessages(0);
}
private Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
pager.setCurrentItem(currentIndex + 1, true);
handler.sendEmptyMessageDelayed(0, duration);
return false;
}
});
}
banner的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/common_view_banner_container"
android:layout_width="match_parent"
android:layout_height="@dimen/common_banner_height"
android:background="@color/common_white">
<android.support.v4.view.ViewPager
android:id="@+id/common_view_banner_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:id="@+id/common_view_banner_points"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:orientation="horizontal"
android:padding="@dimen/common_padding_5" />
</RelativeLayout>
styleable文件
<declare-styleable name="Banner" tools:ignore="ResourceName">
<attr name="banner_duration" format="integer" />
<attr name="banner_height" format="integer" />
</declare-styleable>
ViewPager的差值修改
public class FixedSpeedScroller extends Scroller {
private int duration = 500;
public FixedSpeedScroller(Context context, Interpolator interpolator) {
super(context, interpolator);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
super.startScroll(startX, startY, dx, dy, this.duration);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy) {
super.startScroll(startX, startY, dx, dy, duration);
}
public void setDuration(int duration) {
this.duration = duration;
}
public static void setViewPagerDuration(ViewPager pager, int duration) {
try {
Field field = ViewPager.class.getDeclaredField("mScroller");
field.setAccessible(true);
FixedSpeedScroller scroller = new FixedSpeedScroller(pager.getContext(), new AccelerateInterpolator());
scroller.setDuration(300);
field.set(pager, scroller);
} catch (Exception e) {
e.printStackTrace();
}
}
}
