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Android自定義控件實(shí)現(xiàn)優(yōu)雅的廣告輪播圖

 更新時(shí)間：2021年05月28日 17:08:13   作者：landptf  
這篇文章主要為大家詳細(xì)介紹了Android自定義控件實(shí)現(xiàn)優(yōu)雅的廣告輪播圖，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

前言

今天給大家?guī)硪粋€(gè)新的控件–輪播圖，網(wǎng)上已經(jīng)有很多這類的博客來講解如何實(shí)現(xiàn)的，那么我的這個(gè)有哪些特點(diǎn)呢？或是說有哪些不同呢？

滿足了輪播圖的基本要求，循環(huán)滑動(dòng)，在最后一張切到第一張時(shí)可以平穩(wěn)的過渡
簡潔簡潔簡潔
擴(kuò)展性強(qiáng)

如何使用

下面我們先展示兩種效果圖

1 默認(rèn)效果

代碼實(shí)現(xiàn)

//布局代碼
<com.landptf.view.BannerM
  android:id="@+id/bm_banner"
  android:layout_width="match_parent"
  android:layout_height="200dp" />

//java代碼
BannerM banner = (BannerM) findViewById(R.id.bm_banner);
if (banner != null) {
 banner.setBannerBeanList(bannerList).show();
}

//初始化數(shù)據(jù)
private void initData() {
 bannerList = new ArrayList<>(4);
 BannerBean banner1 = new BannerBean("測試圖片1", url1, "");
 BannerBean banner2 = new BannerBean("測試圖片2", url2, "");
 BannerBean banner3 = new BannerBean("測試圖片3", url3, "");
 BannerBean banner4 = new BannerBean("測試圖片4", url4, "");
 bannerList.add(banner1);
 bannerList.add(banner2);
 bannerList.add(banner3);
 bannerList.add(banner4);
}

其實(shí)關(guān)鍵代碼就一行，這里面用到了BannerBean的實(shí)體類，有三個(gè)參數(shù)，分別是圖片的描述文字，圖片地址，點(diǎn)擊后對應(yīng)的鏈接

以上全部都是默認(rèn)值，下面來看一下都哪些可以自定義

2 自定義效果

圖1和圖2主要有以下幾點(diǎn)不同

1 指示器和文字的位置結(jié)構(gòu)，這里面我只實(shí)現(xiàn)了兩種，大家也可以下載源碼后擴(kuò)展
2 圓點(diǎn)指示器選中后的顏色
3 自動(dòng)播放的時(shí)間間隔
4 支持圖片未加載出來之前顯示默認(rèn)圖片

自定義效果的代碼實(shí)現(xiàn)

下面通過xml和java代碼來分別演示一下圖2的實(shí)現(xiàn)

1 xml

<com.landptf.view.BannerM
  android:id="@+id/bm_banner"
  android:layout_width="match_parent"
  android:layout_height="200dp"
  landptf:defaultImageDrawable="@drawable/default_image"
  landptf:intervalTime="3"
  landptf:indexPosition="bottom"
  landptf:indexColor="@color/colorPrimary"
  />

BannerM banner = (BannerM) findViewById(R.id.bm_banner);
if (banner != null) {
 banner.setBannerBeanList(bannerList)
   .setOnItemClickListener(new BannerM.OnItemClickListener() {
    @Override
    public void onItemClick(int position) {
     Log.e("landptf", "position = " + position);
    }
   })
   .show();
}

2 java

<com.landptf.view.BannerM
  android:id="@+id/bm_banner"
  android:layout_width="match_parent"
  android:layout_height="200dp" />

BannerM banner = (BannerM) findViewById(R.id.bm_banner);
if (banner != null) {
 banner.setBannerBeanList(bannerList)
   .setDefaultImageResId(R.drawable.default_image)
   .setIndexPosition(BannerM.INDEX_POSITION_BOTTOM)
   .setIndexColor(getResources().getColor(R.color.colorPrimary))
   .setIntervalTime(3)
   .setOnItemClickListener(new BannerM.OnItemClickListener() {
    @Override
    public void onItemClick(int position) {
     Log.e("landptf", "position = " + position);
    }
   })
   .show();
}

以上兩種代碼實(shí)現(xiàn)的效果完全等價(jià)，在java代碼中都是通過鏈?zhǔn)秸{(diào)用，使代碼看起來更加的簡潔。
有木有很方便，大大的減少了代碼量，而且是可以直接拿來用的。好了下面我們來看一下實(shí)現(xiàn)的代碼。

實(shí)現(xiàn)

圖片下載集成了Picasso，有對Picasso不熟悉的童鞋可以看一下我之前的博客圖片加載利器之Picasso（二）基本用法

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

 <android.support.v4.view.ViewPager
  android:id="@+id/vp_banner"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />

 <ViewStub
  android:id="@+id/vs_index_right"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_alignParentBottom="true"
  android:layout="@layout/viewstub_banner_m_index_right" />

 <ViewStub
  android:id="@+id/vs_index_bottom"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_alignParentBottom="true"
  android:layout="@layout/viewstub_banner_m_index_bottom" />

</RelativeLayout>

ViewStub的引用代碼這里就不給出，大家可以訪問我的git查看，文末會(huì)給出地址

package com.landptf.view;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.support.annotation.Nullable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.ViewStub;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.landptf.R;
import com.landptf.bean.BannerBean;
import com.landptf.util.ConvertM;
import com.squareup.picasso.MemoryPolicy;
import com.squareup.picasso.Picasso;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * Created by landptf on 2017/03/06.
 * 輪播圖控件
 */
public class BannerM extends RelativeLayout {
 /**
  * 圓點(diǎn)指示器的位置，文字在左，圓點(diǎn)在右
  */
 public static final int INDEX_POSITION_RIGHT = 0x100;
 /**
  * 圓點(diǎn)指示器的位置，文字在上，圓點(diǎn)在下
  */
 public static final int INDEX_POSITION_BOTTOM = 0x101;

 private static final int HANDLE_UPDATE_INDEX = 0;

 private Context mContext;
 private ViewPager vpBanner;
 private ViewPagerAdapter adapter;
 private OnItemClickListener mOnItemClickListener;

 //裝載ImageView控件的list
 private List<ImageView> ivList;
 //圓點(diǎn)指示器控件
 private List<View> vList;
 //控制圓點(diǎn)View的形狀，未選中的顏色
 private GradientDrawable gradientDrawable;
 //控制圓點(diǎn)View的形狀，選中的顏色
 private GradientDrawable gradientDrawableSelected;
 //選中圓點(diǎn)的顏色值，默認(rèn)為#FF3333
 private int indexColorResId;
 //圖片對應(yīng)的文字描述
 private TextView tvText;
 //自動(dòng)滑動(dòng)的定時(shí)器
 private ScheduledExecutorService scheduledExecutorService;
 //當(dāng)前加載到第幾頁
 private int currentIndex = 0;
 //默認(rèn)背景圖
 private int defaultImageResId;
 private Drawable defaultImageDrawable = null;
 //自動(dòng)輪播的時(shí)間間隔(s)
 private int intervalTime = 5;
 //輪播圖需要的數(shù)據(jù)列表
 private List<BannerBean> bannerBeanList;
 //圓點(diǎn)指示器的位置，提供兩種布局
 private int indexPosition = INDEX_POSITION_RIGHT;

 public BannerM(Context context) {
  this(context, null);
 }

 public BannerM(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public BannerM(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init(context, attrs, defStyleAttr);
 }

 private void init(Context context, AttributeSet attrs, int defStyle) {
  mContext = context;
  LayoutInflater.from(context).inflate(R.layout.view_banner_m, this, true);
  vpBanner = (ViewPager) findViewById(R.id.vp_banner);
  TypedArray a = getContext().obtainStyledAttributes(
    attrs, R.styleable.bannerM, defStyle, 0);
  if (a != null) {
   defaultImageDrawable = a.getDrawable(R.styleable.bannerM_defaultImageDrawable);
   intervalTime = a.getInteger(R.styleable.bannerM_intervalTime, 5);
   indexPosition = a.getInteger(R.styleable.bannerM_indexPosition, INDEX_POSITION_RIGHT);
   ColorStateList indexColorList = a.getColorStateList(R.styleable.bannerM_indexColor);
   if (indexColorList != null) {
    indexColorResId = indexColorList.getColorForState(getDrawableState(), 0);
   }
   a.recycle();
  }
 }

 /**
  * 設(shè)置圖片加載之前默認(rèn)顯示的圖片
  *
  * @param defaultImageResId
  * @return BannerM
  */
 public BannerM setDefaultImageResId(int defaultImageResId) {
  this.defaultImageResId = defaultImageResId;
  return this;
 }

 /**
  * 設(shè)置圖片加載之前默認(rèn)顯示的圖片
  *
  * @param defaultImageDrawable
  * @return BannerM
  */
 public BannerM setDefaultImageDrawable(Drawable defaultImageDrawable) {
  this.defaultImageDrawable = defaultImageDrawable;
  return this;
 }

 /**
  * 設(shè)置輪播的時(shí)間間隔，單位為s，默認(rèn)為5s
  *
  * @param intervalTime
  * @return BannerM
  */
 public BannerM setIntervalTime(int intervalTime) {
  this.intervalTime = intervalTime;
  return this;
 }

 /**
  * 設(shè)置圓點(diǎn)指示器的位置
  * #BannerM.INDEX_POSITION_RIGHT or #BannerM.INDEX_POSITION_BOTTOM
  *
  * @param indexPosition
  * @return BannerM
  */
 public BannerM setIndexPosition(int indexPosition) {
  this.indexPosition = indexPosition;
  return this;
 }

 /**
  * 選中圓點(diǎn)的顏色值，默認(rèn)為#FF3333
  *
  * @param indexColor
  * @return BannerM
  */
 public BannerM setIndexColor(int indexColor) {
  this.indexColorResId = indexColor;
  return this;
 }

 /**
  * 設(shè)置輪播圖需要的數(shù)據(jù)列表
  *
  * @param bannerBeanList
  * @return BannerM
  */
 public BannerM setBannerBeanList(List<BannerBean> bannerBeanList) {
  this.bannerBeanList = bannerBeanList;
  return this;
 }

 /**
  * 設(shè)置圖片的點(diǎn)擊事件
  * @param listener
  */
 public BannerM setOnItemClickListener(@Nullable OnItemClickListener listener) {
  mOnItemClickListener = listener;
  return this;
 }

 public void show() {
  if (bannerBeanList == null || bannerBeanList.size() == 0) {
   throw new IllegalArgumentException("bannerBeanList == null");
  }
  initImageViewList();
  initIndexList();
  vpBanner.addOnPageChangeListener(new OnPageChangeListener());
  adapter = new ViewPagerAdapter();
  vpBanner.setAdapter(adapter);
  //定時(shí)器開始工作
  startPlay();
 }

 /**
  * 初始化圓點(diǎn)指示器，根據(jù)indexPosition來加載不同的布局
  */
 private void initIndexList() {
  int count = bannerBeanList.size();
  vList = new ArrayList<>(count);
  LinearLayout llIndex;
  if (indexPosition == INDEX_POSITION_RIGHT) {
   ViewStub vsIndexRight = (ViewStub) findViewById(R.id.vs_index_right);
   vsIndexRight.inflate();
   llIndex = (LinearLayout) findViewById(R.id.ll_index_right);
   tvText = (TextView) findViewById(R.id.tv_text);
  } else {
   ViewStub vsIndexBottom = (ViewStub) findViewById(R.id.vs_index_bottom);
   vsIndexBottom.inflate();
   llIndex = (LinearLayout) findViewById(R.id.ll_index_bottom);
   tvText = (TextView) findViewById(R.id.tv_text);
  }
  //默認(rèn)第一張圖片的文字描述
  tvText.setText(bannerBeanList.get(0).getText());
  //使用GradientDrawable構(gòu)造圓形控件
  gradientDrawable = new GradientDrawable();
  gradientDrawable.setShape(GradientDrawable.OVAL);
  gradientDrawable.setColor(mContext.getResources().getColor(R.color.text));
  gradientDrawableSelected = new GradientDrawable();
  gradientDrawableSelected.setShape(GradientDrawable.OVAL);
  if (indexColorResId != 0) {
   gradientDrawableSelected.setColor(indexColorResId);
  } else {
   gradientDrawableSelected.setColor(mContext.getResources().getColor(R.color.mainColor));
  }

  for (int i = 0; i < count; i++) {
   View view = new View(mContext);
   LinearLayout.LayoutParams lpView = new LinearLayout.LayoutParams(ConvertM.dp2px(mContext, 8), ConvertM.dp2px(mContext, 8));
   lpView.rightMargin = ConvertM.dp2px(mContext, 4);
   view.setLayoutParams(lpView);
   if (0 == i) {
    view.setBackgroundDrawable(gradientDrawableSelected);
   } else {
    view.setBackgroundDrawable(gradientDrawable);
   }
   view.bringToFront();
   vList.add(view);
   llIndex.addView(view);
  }
 }

 /**
  * 初始化ImageView，使用Picasso下載圖片，只在SdCard中緩存
  */
 private void initImageViewList() {
  int count = bannerBeanList.size();
  ivList = new ArrayList<>(count);
  for (int i = 0; i < count; i++) {
   final ImageView imageView = new ImageView(mContext);
   imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
   ivList.add(imageView);
   imageView.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
     mOnItemClickListener.onItemClick(getPosition(imageView));
    }
   });
   if (defaultImageResId != 0) {
    Picasso.with(mContext)
      .load(bannerBeanList.get(i).getUrl())
      .placeholder(defaultImageResId)
      .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)
      .into(imageView);
   } else if (defaultImageDrawable != null) {
    Picasso.with(mContext)
      .load(bannerBeanList.get(i).getUrl())
      .placeholder(defaultImageDrawable)
      .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)
      .into(imageView);
   } else {
    Picasso.with(mContext)
      .load(bannerBeanList.get(i).getUrl())
      .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)
      .into(imageView);
   }
  }
 }

 private void startPlay() {
  scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
  scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
   @Override
   public void run() {
    currentIndex++;
    handler.obtainMessage(HANDLE_UPDATE_INDEX).sendToTarget();
   }
  }, intervalTime, intervalTime, TimeUnit.SECONDS);
 }

 /**
  * 獲取點(diǎn)擊圖片的位置
  * @param item
  * @return int
  */
 private int getPosition(ImageView item) {
  for (int i = 0; i < ivList.size(); i++) {
   if (item == ivList.get(i)) {
    return i;
   }
  }
  return -1;
 }

 @SuppressLint("HandlerLeak")
 private Handler handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
   switch (msg.what) {
    case HANDLE_UPDATE_INDEX:
     vpBanner.setCurrentItem(currentIndex);
     break;
    default:
     break;
   }
  }
 };

 private class OnPageChangeListener implements ViewPager.OnPageChangeListener {
  @Override
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  }

  @Override
  public void onPageSelected(int position) {
   currentIndex = position;
   for (int i = 0; i < bannerBeanList.size(); i++) {
    if (position % ivList.size() == i) {
     vList.get(i).setBackgroundDrawable(gradientDrawableSelected);
    } else {
     vList.get(i).setBackgroundDrawable(gradientDrawable);
    }
    tvText.setText(bannerBeanList.get(position % ivList.size()).getText());
   }
  }

  @Override
  public void onPageScrollStateChanged(int state) {
  }
 }


 private class ViewPagerAdapter extends PagerAdapter {
  @Override
  public void destroyItem(View container, int position, Object object) {
  }

  @Override
  public Object instantiateItem(View container, int position) {
   position %= ivList.size();
   if (position<0){
    position = ivList.size()+position;
   }
   ImageView imageView = ivList.get(position);
   ViewParent vp =imageView.getParent();
   if (vp!=null){
    ViewGroup parent = (ViewGroup)vp;
    parent.removeView(imageView);
   }
   ((ViewPager) container).addView(imageView);
   return imageView;
  }

  @Override
  public int getCount() {
   return Integer.MAX_VALUE;
  }

  @Override
  public boolean isViewFromObject(View arg0, Object arg1) {
   return arg0 == arg1;
  }

  @Override
  public void restoreState(Parcelable arg0, ClassLoader arg1) {

  }

  @Override
  public Parcelable saveState() {
   return null;
  }

  @Override
  public void startUpdate(View arg0) {
  }

  @Override
  public void finishUpdate(View arg0) {
  }
 }

 public interface OnItemClickListener {
  void onItemClick(int position);
 }
}

這篇文章就介紹到這里了，點(diǎn)擊這里查看源碼

下面是測試用的圖片：

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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