先上效果图:
本项目是用到两种轮播图,参考了网上一些大神的代码,自己做了一点点修改,一种是自定义视图轮播。还有一种是常见的APP首页广告图片轮播。
下面贴上关键类的代码:
实现自定义视图轮播的类:CycleMyViewPager
package cn.cnpp.cycleviewpager;
import android.app.Fragment;
import android.os.Bundle;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import java.util.ArrayList;
import java.util.List;
/**
* @author dyl
* 实现可循环,可轮播的viewpager
*/
public class CycleMyViewPager extends Fragment implements OnPageChangeListener {
private List<View> viewList = new ArrayList<>();
private ImageView[] indicators;
private FrameLayout viewPagerFragmentLayout;
/**
* 指示器
*/
private LinearLayout indicatorLayout;
private BaseViewPager viewPager;
private ViewPagerAdapter adapter;
private CycleViewPagerHandler handler;
/**
* 默认轮播时间
*/
private int time = 5000;
/**
* 轮播当前位置
*/
private int currentPosition = 0;
/**
* 滚动框是否滚动着
*/
private boolean isScrolling = false;
/**
* 是否循环
*/
private boolean isCycle = false;
/**
* 是否轮播
*/
private boolean isWheel = false;
/**
* 手指松开、页面不滚动时间,防止手机松开后短时间进行切换
*/
private long releaseTime = 0;
/**
* 转动
*/
private int WHEEL = 100;
/**
* 等待
*/
private int WHEEL_WAIT = 101;
private ItemCycleViewListener mImageCycleViewListener;
private ItemScrollCycleViewListener itemScrollCycleViewListener;
private int[] intInfos;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = LayoutInflater.from(getActivity()).inflate(R.layout.view_cycle_viewpager_contet, null);
viewPager = view.findViewById(R.id.viewPager);
indicatorLayout = view.findViewById(R.id.layout_viewpager_indicator);
viewPagerFragmentLayout = view.findViewById(R.id.layout_viewager_content);
handler = new CycleViewPagerHandler(getActivity()) {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == WHEEL && viewList.size() != 0) {
if (!isScrolling) {
int max = viewList.size() + 1;
int position = (currentPosition + 1) % viewList.size();
viewPager.setCurrentItem(position, true);
// 最后一页时回到第一页
if (position == max) {
viewPager.setCurrentItem(1, false);
}
}
releaseTime = System.currentTimeMillis();
handler.removeCallbacks(runnable);
handler.postDelayed(runnable, time);
return;
}
if (msg.what == WHEEL_WAIT && viewList.size() != 0) {
handler.removeCallbacks(runnable);
handler.postDelayed(runnable, time);
}
}
};
return view;
}
public void setCycleViewData(List<View> views, int[] list, ItemCycleViewListener listener, ItemScrollCycleViewListener scrollListener) {
setData(views, list, listener, 0, scrollListener);
}
/**
* 初始化viewpager
*
* @param views 要显示的views
* @param showPosition 默认显示位置
*/
public void setData(List<View> views, int[] list, ItemCycleViewListener listener, int showPosition, ItemScrollCycleViewListener scrollListener) {
mImageCycleViewListener = listener;
itemScrollCycleViewListener = scrollListener;
intInfos = list;
this.viewList.clear();
if (views.size() == 0) {
viewPagerFragmentLayout.setVisibility(View.GONE);
return;
}
for (View item : views) {
this.viewList.add(item);
}
int ivSize = views.size();
// 设置指示器
indicators = new ImageView[ivSize - 2];
indicatorLayout.removeAllViews();
for (int i = 0; i < indicators.length; i++) {
View view = LayoutInflater.from(getActivity()).inflate(R.layout.view_cycle_viewpager_indicator, null);
indicators[i] = view.findViewById(R.id.image_indicator);
indicatorLayout.addView(view);
}
adapter = new ViewPagerAdapter();
// 默认指向第一项,下方viewPager.setCurrentItem将触发重新计算指示器指向
setIndicator(0);
viewPager.setOffscreenPageLimit(3);
viewPager.setOnPageChangeListener(this);
viewPager.setAdapter(adapter);
if (showPosition < 0 || showPosition >= views.size()) {
showPosition = 0;
}
if (isCycle) {
showPosition = showPosition + 1;
}
viewPager.setCurrentItem(showPosition);
}
/**
* 设置指示器居中,默认指示器在右方
*/
public void setIndicatorCenter() {
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
params.addRule(RelativeLayout.CENTER_HORIZONTAL);
indicatorLayout.setLayoutParams(params);
}
/**
* 是否循环,默认不开启,开启前,请将views的最前面与最后面各加入一个视图,用于循环
*
* @param isCycle 是否循环
*/
public void setCycle(boolean isCycle) {
this.isCycle = isCycle;
}
/**
* 设置是否轮播,默认不轮播,轮播一定是循环的
*
* @param isWheel
*/
public void setWheel(boolean isWheel) {
this.isWheel = isWheel;
isCycle = true;
if (isWheel) {
handler.postDelayed(runnable, time);
}
}
final Runnable runnable = new Runnable() {
@Override
public void run() {
if (getActivity() != null && !getActivity().isFinishing() && isWheel) {
long now = System.currentTimeMillis();
// 检测上一次滑动时间与本次之间是否有触击(手滑动)操作,有的话等待下次轮播
if (now - releaseTime > time - 500) {
handler.sendEmptyMessage(WHEEL);
} else {
handler.sendEmptyMessage(WHEEL_WAIT);
}
}
}
};
/**
* 设置轮播暂停时间,即没多少秒切换到下一张视图.默认5000ms
*
* @param time 毫秒为单位
*/
public void setTime(int time) {
this.time = time;
}
/**
* 设置viewpager是否可以滚动
*
* @param enable
*/
public void setScrollable(boolean enable) {
viewPager.setScrollable(enable);
}
/**
* 刷新数据,当外部视图更新后,通知刷新数据
*/
public void refreshData() {
if (adapter != null) {
adapter.notifyDataSetChanged();
}
}
/**
* 页面适配器 返回对应的view
*
* @author Yuedong Li
*/
private class ViewPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return viewList.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public View instantiateItem(ViewGroup container, final int position) {
View v = viewList.get(position);
if (mImageCycleViewListener != null) {
v.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mImageCycleViewListener.onItemClick(intInfos[currentPosition - 1], currentPosition, v);
}
});
}
container.addView(v);
return v;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
@Override
public void onPageScrollStateChanged(int state) {
// viewPager滚动状态
if (state == 1) {
isScrolling = true;
return;
} else if (state == 0) {
releaseTime = System.currentTimeMillis();
viewPager.setCurrentItem(currentPosition, false);
}
isScrolling = false;
}
@Override
public void onPageScrolled(int position, float offset, int offsetPixels) {
}
@Override
public void onPageSelected(int pos) {
int max = viewList.size() - 1;
int position = pos;
currentPosition = pos;
if (isCycle) {
if (pos == 0) {
currentPosition = max - 1;
} else if (pos == max) {
currentPosition = 1;
}
position = currentPosition - 1;
}
setIndicator(position);
itemScrollCycleViewListener.onScrollListener(position + 1);
}
/**
* 设置指示器
*
* @param selectedPosition 默认指示器位置
*/
private void setIndicator(int selectedPosition) {
for (int i = 0; i < indicators.length; i++) {
indicators[i].setBackgroundResource(R.mipmap.dot_grey);
}
if (indicators.length > selectedPosition) {
indicators[selectedPosition].setBackgroundResource(R.mipmap.dot_yellow);
}
}
/**
* 轮播控件的监听事件
*
* @author minking
*/
public interface ItemCycleViewListener {
/**
* 单击图片事件
*
* @param info
* @param position
* @param imageView
*/
void onItemClick(int info, int position, View imageView);
}
/**
* 轮播控件的滚动监听事件
*
* @author minking
*/
public interface ItemScrollCycleViewListener {
/**
* 单击图片事件
*
* @param position
*/
void onScrollListener(int position);
}
}
MainActivity初始化页面
package cn.cnpp.cycleviewpager;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private CycleMyViewPager cycleViewPager;
private List<View> viewArrayList = new ArrayList<>();
private CycleImageViewPager cycleImageViewPager;
private List<ImageView> imageViewList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initMyViewPager();
initImageViewPager();
}
private void initMyViewPager() {
cycleViewPager = (CycleMyViewPager) getFragmentManager().findFragmentById(R.id.fragment_cycle_viewpager);
viewArrayList.clear();
//测试所用数据源
int[] imgs = {R.mipmap.cate_test1, R.mipmap.cate_test2, R.mipmap.cate_test3, R.mipmap.cate_test4, R.mipmap.cate_test5, R.mipmap.cate_test6,
R.mipmap.cate_test7, R.mipmap.cate_test8};
viewArrayList.add(cycleViewItem(imgs[imgs.length - 1]));
for (int i = 0; i < imgs.length; i++) {
viewArrayList.add(cycleViewItem(imgs[i]));
}
// 将第一个ImageView添加进来
viewArrayList.add(cycleViewItem(imgs[0]));
//循环
cycleViewPager.setCycle(true);
//设置指示器居中显示
cycleViewPager.setIndicatorCenter();
//开启轮播
cycleViewPager.setWheel(true);
//设置可滑动
cycleViewPager.setScrollable(true);
cycleViewPager.setCycleViewData(viewArrayList, imgs, mAdCycleViewListener, mScrollListener);
}
private View cycleViewItem(int date) {
View view = LayoutInflater.from(this).inflate(R.layout.view_cycleview_item, null);
ImageView iv = view.findViewById(R.id.img_address);
TextView tv = view.findViewById(R.id.tv_name);
iv.setImageResource(date);
tv.setText("cnpp" + date);
return view;
}
private CycleMyViewPager.ItemCycleViewListener mAdCycleViewListener = new CycleMyViewPager.ItemCycleViewListener() {
@Override
public void onItemClick(int info, int position, View imageView) {
showToastShort(MainActivity.this, "您点击了" + position);
}
};
private CycleMyViewPager.ItemScrollCycleViewListener mScrollListener = new CycleMyViewPager.ItemScrollCycleViewListener() {
@Override
public void onScrollListener(int position) {
showToastShort(MainActivity.this, "您滑动到了" + position);
}
};
private void initImageViewPager() {
cycleImageViewPager = (CycleImageViewPager) getFragmentManager().findFragmentById(R.id.fragment_image_viewpager);
// 将最后一个ImageView添加进来
imageViewList.clear();
int[] imgs = {R.mipmap.ad_img1, R.mipmap.ad_img2, R.mipmap.ad_img3};
imageViewList.add(setImageResource(imgs[imgs.length - 1]));
for (int i = 0; i < imgs.length; i++) {
imageViewList.add(setImageResource(imgs[i]));
}
// 将第一个ImageView添加进来
imageViewList.add(setImageResource(imgs[0]));
// 设置循环,在调用setData方法前调用
cycleImageViewPager.setCycle(true);
// 在加载数据前设置是否循环
cycleImageViewPager.setIntData(imageViewList, imgs, mCycleViewListener);
// 设置轮播
cycleImageViewPager.setWheel(true);
// 设置轮播时间,默认5000ms
cycleImageViewPager.setTime(3000);
// 设置圆点指示图标组居中显示,默认靠右
cycleImageViewPager.setIndicatorCenter();
}
private CycleImageViewPager.ImageCycleViewListener mCycleViewListener = new CycleImageViewPager.ImageCycleViewListener() {
@Override
public void onImageClick(int info, int position, View imageView) {
if (cycleImageViewPager.isCycle()) {
}
}
};
private ImageView setImageResource(int img) {
ImageView imageView = (ImageView) LayoutInflater.from(this).inflate(R.layout.view_imageview, null);
imageView.setImageResource(img);
return imageView;
}
private void showToastShort(Context context, String str) {
Toast toast = Toast.makeText(context, str, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}
布局文件activity_main.xml.
这里有一点要注意的是,fragment这里的name属性是自定义ViewPager的类名,如果用到自己的项目中去需要修改这个包名。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context="cn.cnpp.cycleviewpager.MainActivity">
<fragment
android:id="@+id/fragment_cycle_viewpager"
android:name="cn.cnpp.cycleviewpager.CycleMyViewPager"
android:layout_width="match_parent"
android:layout_height="150dp" />
<fragment
android:id="@+id/fragment_image_viewpager"
android:name="cn.cnpp.cycleviewpager.CycleImageViewPager"
android:layout_width="match_parent"
android:layout_marginTop="20dp"
android:layout_height="100dp" />
</LinearLayout>
主要的类就是这些了,需要查看完整的代码可以下载demo。