Android--自定义控件（图片轮播）

效果图：

方法一：原理就是利用定时任务器定时切换ViewPager的页面

import java.util.ArrayList;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class MainActivity extends Activity {
	private ViewPager viewPager;
	private TextView tv_intro;
	private LinearLayout dot_layout;
	
	private ArrayList<Ad> list = new ArrayList<Ad>();
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		initView();
		initListener();
		initData();
	}


	private void initView() {
		setContentView(R.layout.activity_main);
		viewPager = (ViewPager) findViewById(R.id.viewPager);
		tv_intro = (TextView) findViewById(R.id.tv_intro);
		dot_layout = (LinearLayout) findViewById(R.id.dot_layout);
	}
	
	private void initListener() {
		viewPager.setOnPageChangeListener(new OnPageChangeListener() {
			@Override
			public void onPageSelected(int position) {
				Log.e("Activity", "position: "+position);
				updateIntroAndDot();
			}
			@Override
			public void onPageScrolled(int position, float positionOffset,
					int positionOffsetPixels) {
			}
			@Override
			public void onPageScrollStateChanged(int state) {
			}
		});
	}
	
	private void initData() {
		list.add(new Ad(R.drawable.a, "巩俐不低俗，我就不能低俗"));
		list.add(new Ad(R.drawable.b, "朴树又回来了，再唱经典老歌引百万人同唱啊"));
		list.add(new Ad(R.drawable.c, "揭秘北京电影如何升级"));
		list.add(new Ad(R.drawable.d, "乐视网TV版大放送"));
		list.add(new Ad(R.drawable.e, "热血屌丝的反杀"));
		
		initDots();
		
		viewPager.setAdapter(new MyPagerAdapter());
		
		updateIntroAndDot();
	}
	
	/**
	 * 初始化dot
	 */
	private void initDots(){
		for (int i = 0; i < list.size(); i++) {
			View view = new View(this);
			LayoutParams params = new LayoutParams(8, 8);
			if(i!=0){
				params.leftMargin = 5;
			}
			view.setLayoutParams(params);
			view.setBackgroundResource(R.drawable.selector_dot);
			dot_layout.addView(view);
		}
	}

	/**
	 * 更新文本
	 */
	private void updateIntroAndDot(){
		int currentPage = viewPager.getCurrentItem()%list.size();
		tv_intro.setText(list.get(currentPage).getIntro());
		
		for (int i = 0; i < dot_layout.getChildCount(); i++) {
			dot_layout.getChildAt(i).setEnabled(i==currentPage);
		}
	}
	
	class MyPagerAdapter extends PagerAdapter{
		
		/**
		 * 返回多少page
		 */
		@Override
		public int getCount() {
			return 100;
		}

		/**
		 * true: 表示不去创建，使用缓存  false:去重新创建
		 * view： 当前滑动的view
		 * object：将要进入的新创建的view，由instantiateItem方法创建
		 */
		@Override
		public boolean isViewFromObject(View view, Object object) {
			return view==object;
		}

		/**
		 * 类似于BaseAdapger的getView方法
		 * 用了将数据设置给view
		 * 由于它最多就3个界面，不需要viewHolder
		 */
		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			View view = View.inflate(MainActivity.this, R.layout.adapter_ad, null);
			ImageView imageView = (ImageView) view.findViewById(R.id.image);
			
			Ad ad = list.get(position%list.size());
			imageView.setImageResource(ad.getIconResId());
			
			container.addView(view);//一定不能少，将view加入到viewPager中
			
			return view;
		}
		
		/**
		 * 销毁page
		 * position： 当前需要消耗第几个page
		 * object:当前需要消耗的page
		 */
		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
//			super.destroyItem(container, position, object);
			container.removeView((View) object);
		}
		
		
		
	}

}

1、在gradle中导入包

compile 'com.jude:rollviewpager:1.2.9'

2、设置播放时间间隔、透明度、指示器（指示器可以是默认原点，数字，也可以自定义图片。

3、设置适配器,本demo中是StaticPagerAdapter，这个比较简单，用的比较多，有其他需要的可以看github源码。

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
 
import com.jude.rollviewpager.RollPagerView;
import com.jude.rollviewpager.adapter.StaticPagerAdapter;
import com.jude.rollviewpager.hintview.ColorPointHintView;
 
public class MainActivity extends AppCompatActivity {
 
    private RollPagerView mRollViewPager;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        mRollViewPager = (RollPagerView) findViewById(R.id.roll_view_pager);
 
        //设置播放时间间隔
        mRollViewPager.setPlayDelay(1000);
        //设置透明度
        mRollViewPager.setAnimationDurtion(500);
        //设置适配器
        mRollViewPager.setAdapter(new TestNormalAdapter());
 
        //设置指示器（顺序依次）
        //自定义指示器图片
        //设置圆点指示器颜色
        //设置文字指示器
        //隐藏指示器
        //mRollViewPager.setHintView(new IconHintView(this, R.drawable.point_focus, R.drawable.point_normal));
        mRollViewPager.setHintView(new ColorPointHintView(this, Color.YELLOW,Color.WHITE));
        //mRollViewPager.setHintView(new TextHintView(this));
        //mRollViewPager.setHintView(null);
    }
 
    private class TestNormalAdapter extends StaticPagerAdapter {
        private int[] imgs = {
                R.drawable.img1,
                R.drawable.img2,
                R.drawable.img3,
                R.drawable.img4,
        };
 
 
        @Override
        public View getView(ViewGroup container, int position) {
            ImageView view = new ImageView(container.getContext());
            view.setImageResource(imgs[position]);
            view.setScaleType(ImageView.ScaleType.CENTER_CROP);
            view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
            return view;
        }
 
 
        @Override
        public int getCount() {
            return imgs.length;
        }
    }
 
}