Android Viewpager滑动背景颜色变化的动画

效果:

package cn.taurusxi.guidebackgroundcoloranimation.sample;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import cn.taurusxi.guidebackgroundcoloranimation.library.ColorAnimationView;

public class SampleActivity
		extends FragmentActivity
		implements ColorAnimationView.OnPageChangeListener {
	private static final int[] resource = new int[]{R.drawable.welcome1, R.drawable.welcome4,
			R.drawable.welcome3, R.drawable.welcome4};
	private static final String TAG = SampleActivity.class.getSimpleName();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_sample);
		MyFragmentStatePager adpter = new MyFragmentStatePager(getSupportFragmentManager());
		ColorAnimationView colorAnimationView = (ColorAnimationView) findViewById(R.id.ColorAnimationView);
		ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
		viewPager.setAdapter(adpter);
		/**
		 *  首先，你必须在 设置 Viewpager的 adapter 之后在调用这个方法
		 *  第二点，setmViewPager(ViewPager mViewPager,Object obj, int count, int... colors)
		 *         第一个参数 是 你需要传人的 viewpager
		 *         第二个参数 是 一个实现了ColorAnimationView.OnPageChangeListener接口的Object,用来实现回调
		 *         第三个参数 是 viewpager 的 孩子数量
		 *         第四个参数 int... colors ，你需要设置的颜色变化值~~ 如何你传人 空，那么触发默认设置的颜色动画
		 * */
		/**
		 *  Frist: You need call this method after you set the Viewpager adpter;
		 * Second: setmViewPager(ViewPager mViewPager,Object obj， int count, int... colors)
		 *          so,you can set any length colors to make the animation more cool!
		 * Third: If you call this method like below, make the colors no data, it will create
		 *          a change color by default.
		 * */
		colorAnimationView.setmViewPager(viewPager, this, resource.length);
		// Four : Also ,you can call this method like this:
		// colorAnimationView.setmViewPager(viewPager,this,resource.length,0xffFF8080,0xff8080FF,0xffffffff,0xff80ff80);
	}

	// 实现 OnPageChangeListener的回调方法
	//Implement OnPageChangeListener callback methods
	@Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
		Log.e(TAG, "call onPageScrolled method");
	}

	// 实现 OnPageChangeListener的回调方法
	//Implement OnPageChangeListener callback methods
	@Override public void onPageSelected(int position) {
		Log.e(TAG, "call onPageSelected method");
	}

	// 实现 OnPageChangeListener的回调方法
	//Implement OnPageChangeListener callback methods
	@Override public void onPageScrollStateChanged(int state) {
		Log.e(TAG, "call onPageScrollStateChanged method");
	}


	public class MyFragmentStatePager
			extends FragmentStatePagerAdapter {

		public MyFragmentStatePager(FragmentManager fm) {
			super(fm);
		}

		@Override public Fragment getItem(int position) {
			return new MyFragment(position);
		}

		@Override public int getCount() {
			return resource.length;
		}
	}

	@SuppressLint("ValidFragment") public class MyFragment
			extends Fragment {
		private int position;

		public MyFragment(int position) {
			this.position = position;
		}

		@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
			ImageView imageView = new ImageView(getActivity());
			imageView.setImageResource(resource[position]);
			return imageView;
		}
	}
}