ViewPager学习

官方文档：

https://developer.android.com/reference/android/support/v4/view/ViewPager.html

一、使用步骤

（1）在布局中新建一个ViewPager的控件

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

（2）编写ViewPager特有的Adapter

一般是继承ViewPager的PagerAdapter，主要重写getCount、instantiateItem、destroyItem、isViewFromObject方法

private static final int sMyDrawableIds[] = {
        R.drawable.img1,
        R.drawable.img2,
        R.drawable.img3,
    };
private class MyPagerAdapter extends PagerAdapter {
        private List<View> mListViews;

        public MyPagerAdapter(Context context) {
            mListViews = new ArrayList<>();

            Resources resources = context.getResources();
            for (int i = 0; i < 3; ++i) {
                ImageView imageView = new ImageView(context);
                imageView.setImageDrawable(resources.getDrawable(sMyDrawableIds[i]));
                mListViews.add(imageView);
            }
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View view = mListViews.get(position);
            container.addView(view);
            return view;
        }

        @Override
        public int getCount() {
            return mListViews.size();
        }

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

（3）实例化ViewPager并绑定Adapter

private ViewPager mViewPager;
private void initView() {
        mViewPager = (ViewPager) findViewById(R.id.clip_tips_step_pager);
        mViewPager.setAdapter(new ClipPagerAdapter(mContext));
}

如果设置监听事件，可以采用addOnPageChangeListener(ViewPager.OnPageChangeListener listener)

private class MyPagerChangeListener implements ViewPager.OnPageChangeListener {
	@Override
	public void onPageSelected(int position) {}

	@Override
	public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}

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

mViewPager.addOnPageChangeListener(new MyPagerChangeListener());

二、一些常用方法

setCurrentItem(int item) ：设置现在选择的页面

三、深入使用

ViewPager 全面剖析及使用详解 http://www.jianshu.com/p/e5abbda4a71c （提高篇）

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