非常简单的方法实现ViewPager自动循环轮播

非常简单的方法实现ViewPager自动循环轮播,见红色代码部分,其它的代码可以忽略不看。

简洁高效是我解决问题的首要出发点。

package com.shuivy.happylendandreadbooks.fragment;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView; import com.shuivy.happylendandreadbooks.R;
import com.shuivy.happylendandreadbooks.adapter.MyViewPagerAdapter; import java.util.ArrayList;
import java.util.List; /**
* Created by stk on 2016/7/22 0022.
*/
public class HomeFragment extends Fragment { private View mRootView;
private Activity mContext;
private LayoutInflater mLayoutInflater;
private int[] mImageIdArray;
private static final int TIME = 1700;
private List<View> mLayouts;
private List<View> mDots;
private ViewPager mViewPager;
private int mCount = 3;
private Handler mHandler = new Handler();
private int itemPosition; @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mContext = getActivity();
if (mRootView == null) {
mRootView = inflater.inflate(R.layout.fragment_home, container, false);
mLayoutInflater = inflater;
initView();
} else {
ViewGroup parent = (ViewGroup) mRootView.getParent();
if (parent != null) {
parent.removeView(mRootView);
}
} return mRootView;
} private void initView() {
mImageIdArray = new int[]{
R.mipmap.book_viewpager1,
R.mipmap.book_viewpager2,
R.mipmap.book_viewpager3,
};
TextView textView = (TextView) mRootView.findViewById(R.id.titleView);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mViewPager.setCurrentItem(1);
}
}); initIndex();
} private void initIndex() {
viewPager();
mHandler.postDelayed(runnableForViewPager, TIME);
} /**
* 首页上方的viewpager图片展示
*/
private void viewPager() {
ViewGroup viewGroup = (ViewGroup) mRootView.findViewById(R.id.viewGroup);
mViewPager = (ViewPager) mRootView.findViewById(R.id.viewPager);
//mCount是订单数量,是从订单处得到的数据,我们默认设为3 mLayouts = new ArrayList<>();
mDots = new ArrayList<>();
for (int i = 0; i < mCount; i++) {
//下面两句必须放在for里面
View layoutView = mLayoutInflater.inflate(R.layout.viewpager_item, null);
View dotView = mLayoutInflater.inflate(R.layout.dot, null); ImageView imageView = (ImageView) layoutView.findViewById(R.id.viewpager_image);
imageView.setImageResource(mImageIdArray[i]);
if (i == 0) {
dotView.setBackgroundResource(R.drawable.dot_select);
} else {
dotView.setBackgroundResource(R.drawable.dot_no_select);
}
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
layoutParams.setMargins(20, 0, 20, 0);
viewGroup.addView(dotView, layoutParams); mLayouts.add(layoutView);
mDots.add(dotView); } mViewPager.setAdapter(new MyViewPagerAdapter(mLayouts));
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override
public void onPageSelected(int position) {
for (int i = 0; i < mCount; i++) {
if (i == position) {
mDots.get(i).setBackgroundResource(R.drawable.dot_select);
} else {
mDots.get(i).setBackgroundResource(R.drawable.dot_no_select);
}
}
} @Override
public void onPageScrollStateChanged(int state) { }
});
} /**
* ViewPager的定时器
*/
Runnable runnableForViewPager = new Runnable() {
@Override
public void run() {
try {
itemPosition++;
mHandler.postDelayed(this, TIME);
mViewPager.setCurrentItem(itemPosition % mCount);
} catch (Exception e) {
e.printStackTrace();
}
}
};
}
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