ViewPager最簡單的無限輪播
阿新 • • 發佈：2019-01-23
第一步：重寫一下ViewPager
package com.diction.app.android.view.indicator;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
/**
*
* 這個是自己定義的仿寫的viewpger huguomin
*
* */
public class IndicatorPager extends ViewPager {
private boolean scrollable = true;
public IndicatorPager(Context context) {
super(context);
}
public IndicatorPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if(this.scrollable) {
if (getCurrentItem() == 0 && getChildCount() == 0) {
return false;
}
return super.onTouchEvent(ev);
} else {
return false;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(this.scrollable) {
if (getCurrentItem() == 0 && getChildCount() == 0) {
return false;
}
return super.onInterceptTouchEvent(ev);
} else {
return false;
}
}
public void setScrollable(boolean scrollable) {
this.scrollable = scrollable;
}
}
第二步 封裝一下
package com.diction.app.android.view.indicator;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.diction.app.android.R;
import com.diction.app.android.utils.ImageLoadUtils;
import com.diction.app.android.utils.LogUtils;
import com.diction.app.android.utils.ScreenUtils;
import com.diction.app.android.utils.SizeUtils;
import com.facebook.drawee.view.SimpleDraweeView;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
/**
* Created by huguomin on 2018/7/24.
*/
public class CoustomIndicator extends FrameLayout implements ViewPager.OnPageChangeListener {
public static final String TAG = "CoustomBanner---> ";
private IndicatorPager mCoustomViewPager;
private CoustomScroller mScroller;
private int count;
private List<String> imageViewsList = new ArrayList<>();
private List<String> descLists = new ArrayList<>();
private int currentItem;
private BannerPagerAdapter adapter;
private Context mContext;
private RecyclerView mMRecycler;
public CoustomIndicator(@NonNull Context context) {
super(context);
initView(context);
}
public CoustomIndicator(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
initView(context);
}
private void initView(Context context) {
mContext = context;
int margrleft = SizeUtils.px2dp((ScreenUtils.getScreenWidth()-dip2px(mContext,10)));
LogUtils.e(TAG + " " + margrleft);
LayoutInflater.from(context).inflate(R.layout.item_banner_layout, this, true);
mCoustomViewPager = (IndicatorPager) findViewById(R.id.banner_view);
mMRecycler = findViewById(R.id.sub_recycler);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
mMRecycler.setLayoutManager(linearLayoutManager);
initViewPagerScroll();
}
private void initViewPagerScroll() {
try {
Field mField = ViewPager.class.getDeclaredField("mScroller");
mField.setAccessible(true);
mScroller = new CoustomScroller(mCoustomViewPager.getContext());
mScroller.setDuration(800);
mField.set(mCoustomViewPager, mScroller);
} catch (Exception e) {
// Log.e(tag, e.getMessage());
}
}
public void setImageListAndText(List<String> imagesUrl, List<String> descList) {
if (imagesUrl == null || imagesUrl.size() <= 0) {
Log.e(TAG, "The image data set is empty.");
return;
}
count = imagesUrl.size();
for (int i = 0; i <= count + 1; i++) {
String url = "";
String desc = "";
if (i == 0) {
url = imagesUrl.get(count - 1);
desc = descList.get(count - 1);
} else if (i == count + 1) {
url = imagesUrl.get(0);
desc = descList.get(0);
} else {
url = imagesUrl.get(i - 1);
desc = descList.get(i - 1);
}
imageViewsList.add(url);
descLists.add(desc);
}
setData();
}
private void setData(){
currentItem = 1;
if (adapter == null) {
adapter = new BannerPagerAdapter();
mCoustomViewPager.addOnPageChangeListener(this);
}
mCoustomViewPager.setPageMargin(dip2px(mContext, 10));
mCoustomViewPager.setOffscreenPageLimit(imageViewsList.size());
mCoustomViewPager.setAdapter(adapter);
mCoustomViewPager.setPageTransformer(true,new ZoomOutSlideTransformer());
mCoustomViewPager.setFocusable(true);
mCoustomViewPager.setCurrentItem(1);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
currentItem=position;
if (mPageSelectedListener != null ){
mPageSelectedListener.onPageSelected(toRealPosition(position) );
}
}
public int toRealPosition(int position) {
int realPosition = (position - 1) % count;
if (realPosition < 0)
realPosition += count;
return realPosition;
}
@Override
public void onPageScrollStateChanged(int state) {
switch (state) {
case 0://No operation
if (currentItem == 0) {
mCoustomViewPager.setCurrentItem(count, false);
} else if (currentItem == count + 1) {
mCoustomViewPager.setCurrentItem(1, false);
}
break;
case 1://start Sliding
if (currentItem == count + 1) {
mCoustomViewPager.setCurrentItem(1, false);
} else if (currentItem == 0) {
mCoustomViewPager.setCurrentItem(count, false);
}
break;
case 2://end Sliding
break;
}
}
class BannerPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return imageViewsList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
View inflate = LayoutInflater.from(mContext).inflate(R.layout.item_gallery_layout, null);
SimpleDraweeView image = inflate.findViewById(R.id.indicator_bg_image);
TextView desc = inflate.findViewById(R.id.indicator_bg_text);
RelativeLayout containerView = inflate.findViewById(R.id.contianer);
ImageLoadUtils.loadImage(image,"http://epdapi2.diction.diexun.com"+imageViewsList.get(position));
desc.setText(descLists.get(position));
container.addView(inflate);
return inflate;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
public void setCurrentPosition(int position) {
Log.e(TAG, "setCurrentPosition: -----currentItem 》" + currentItem );
Log.e(TAG, "setCurrentPosition: -----currentItem 》" + currentItem );
if (position == toRealPosition(currentItem))return;
mCoustomViewPager.setCurrentItem(position,false);
}
/**
* dp 的單位 轉成為 px(畫素)
*/
public static int dip2px(Context context, float dpValue) {
/* return (int) (dpValue
* context.getResources().getDisplayMetrics().density + 0.5f);*/
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dpValue, context.getResources().getDisplayMetrics());
}
public interface OnPageSelectedListenter{
void onPageSelected(int position);
}
private OnPageSelectedListenter mPageSelectedListener;
public void setOnPageSelectedListenter(OnPageSelectedListenter l){
mPageSelectedListener = l;
}
}
相關的類
import android.content.Context;
import android.view.animation.Interpolator;
import android.widget.Scroller;
public class CoustomScroller extends Scroller {
private int mDuration = 800;
public CoustomScroller(Context context) {
super(context);
}
public CoustomScroller(Context context, Interpolator interpolator) {
super(context, interpolator);
}
public CoustomScroller(Context context, Interpolator interpolator, boolean flywheel) {
super(context, interpolator, flywheel);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
super.startScroll(startX, startY, dx, dy, mDuration);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy) {
super.startScroll(startX, startY, dx, dy, mDuration);
}
public void setDuration(int time) {
mDuration = time;
}
}相關的佈局檔案
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:clipChildren="false"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.diction.app.android.view.indicator.IndicatorPager
android:clipChildren="false"
android:id="@+id/banner_view"
android:layout_marginLeft="@dimen/x200"
android:layout_marginRight="@dimen/x200"
android:layout_width="match_parent"
android:layout_height="70dp"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/sub_recycler"
android:layout_width="wrap_content"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
搞定！！！！！！