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Android如何仿一号店货物详情轮播图动画效果

还不是很完全,目前只能点中间图片才能位移,图片外的其他区域没有。。(属性动画),对了,图片加载用得是facebook的一款android图片加载库,感...

还不是很完全,目前只能点中间图片才能位移,图片外的其他区域没有。。(属性动画),对了,图片加载用得是facebook的一款android图片加载库,感觉非常NB啊,完爆一切。

1、先看布局

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

  <ScrollView
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="#bfbfbf"
      android:orientation="vertical">

      <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="300dp" />

      <LinearLayout
        android:id="@+id/ll_bottom_container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#ffffff"
        android:orientation="vertical">


        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>

        <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:gravity="center">

          <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Item 1"
            android:textSize="16sp" />
        </LinearLayout>
      </LinearLayout>

    </LinearLayout>
  </ScrollView>

  <!-- 辅助作用,用于计算屏幕中间位置 -->
  <LinearLayout
    android:id="@+id/ll_container_scroll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#bfbfbf"
    android:gravity="center"
    android:orientation="horizontal"
    android:visibility="invisible">
    <!-- 必须和上面显示的viewpager一样高 -->
    <android.support.v4.view.ViewPager
      android:id="@+id/viewPager_2"
      android:layout_width="match_parent"
      android:layout_height="300dp" />

  </LinearLayout>

</RelativeLayout>

2、主界面代码

package com.newair.frescotextdemo;

import android.animation.Animator;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

import adapter.MyViewPagerAdapter;
import utils.ScreenUtils;

public class MainActivity extends AppCompatActivity {


  private ScrollView scrollView;
  private LinearLayout ll_container_scroll;//scrollview第一层容器
  private LinearLayout ll_bottom_container;//底部容器
  private ViewPager viewPager;//滚动列表
  private ViewPager viewPager_2;
  private MyViewPagerAdapter myViewPagerAdapter;//适配器
  private List<String> image_urls;

  private int y; //记住位移了多少

  private boolean isRunAnimation = false;//判断当前动画是否执行完成

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    initView();
    initData();
    initEvent();

  }

  private void initView() {
    scrollView = (ScrollView) findViewById(R.id.scrollView);
    ll_container_scroll = (LinearLayout) findViewById(R.id.ll_container_scroll);
    ll_bottom_container = (LinearLayout) findViewById(R.id.ll_bottom_container);
    viewPager = (ViewPager) findViewById(R.id.viewPager);
    viewPager_2 = (ViewPager) findViewById(R.id.viewPager_2);
  }

  private void initData() {
    image_urls = new ArrayList<>();
    image_urls.add("http://pic31.nipic.com/20130624/8821914_104949466000_2.jpg");
    image_urls.add("http://pic39.nipic.com/20140307/2531170_213037883000_2.jpg");
    image_urls.add("http://pic10.nipic.com/20101020/3650425_202918301404_2.jpg");
    image_urls.add("http://pic4.nipic.com/20091104/3178344_085047585414_2.jpg");
    image_urls.add("http://pic4.nipic.com/20091101/3672704_160309066949_2.jpg");
    myViewPagerAdapter = new MyViewPagerAdapter(this, image_urls);
    viewPager.setAdapter(myViewPagerAdapter);
    viewPager_2.setAdapter(myViewPagerAdapter);
  }

  private void initEvent() {
    //当前页的点击事件
    myViewPagerAdapter.setOnCurrentPositionClickListener(new MyViewPagerAdapter.OnCurrentViewClick() {
      @Override
      public void onCurrentPositionClick(int position) {

        if (viewPager.getTag() == null || ((Integer) viewPager.getTag()) == 1) {
          showAnimation();
        } else {
          hideAnimation();
        }
      }
    });
    ll_bottom_container.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        hideAnimation();
      }
    });
  }

  //显示动画
  public void showAnimation() {
    if (!isRunAnimation) {
      isRunAnimation = true;
      int scrollY = scrollView.getScrollY();
      y = scrollY + ((ll_container_scroll.getMeasuredHeight() / 2) - (viewPager.getMeasuredHeight() / 2));
      viewPager.animate()
          .x(0f)
          .y(y * 1f)
          .setDuration(500)
          .setListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {
              ll_bottom_container.setVisibility(View.INVISIBLE);
            }

            @Override
            public void onAnimationEnd(Animator animation) {
              isRunAnimation = false;
              viewPager.setTag(2);
              y = 0;
              ll_container_scroll.setVisibility(View.VISIBLE);
              viewPager_2.setCurrentItem(viewPager.getCurrentItem(),false);
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
          });
    }

  }

  //关闭动画
  public void hideAnimation() {

    if (!isRunAnimation) {
      viewPager.animate()
          .x(0f)
          .y(-y * 1f)
          .setDuration(500)
          .setListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {
              ll_container_scroll.setVisibility(View.INVISIBLE);
              viewPager.setCurrentItem(viewPager_2.getCurrentItem(),false);
            }

            @Override
            public void onAnimationEnd(Animator animation) {
              isRunAnimation = false;
              viewPager.setTag(1);
              y = 0;
              ll_bottom_container.setVisibility(View.VISIBLE);
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
          });
    }
  }


}

3、viewpager的适配器代码

package adapter;

import android.content.Context;
import android.net.Uri;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.facebook.drawee.view.SimpleDraweeView;
import com.newair.frescotextdemo.R;

import java.util.List;

/**
 * Created by ouhimehime on 16/4/28.
 * ---------ViewPager适配器----------
 */
public class MyViewPagerAdapter extends PagerAdapter {


  public interface OnCurrentViewClick {
    void onCurrentPositionClick(int position);
  }

  private OnCurrentViewClick onCurrentViewClick;

  public void setOnCurrentPositionClickListener(OnCurrentViewClick onCurrentViewClick) {
    this.onCurrentViewClick = onCurrentViewClick;
  }



  private Context context;
  private List<String> myData;

  public MyViewPagerAdapter(Context context, List<String> myData) {
    this.context = context;
    this.myData = myData;
  }

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

  @Override
  public boolean isViewFromObject(View view, Object object) {
    return view == object;
  }

  @Override
  public Object instantiateItem(ViewGroup container, final int position) {
    SimpleDraweeView simpleDraweeView = (SimpleDraweeView) LayoutInflater.from(context).inflate(R.layout.image_view, null);
    Uri uri = Uri.parse(myData.get(position));
    simpleDraweeView.setImageURI(uri);
    container.addView(simpleDraweeView);
    simpleDraweeView.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        onCurrentViewClick.onCurrentPositionClick(position);
      }
    });

    return simpleDraweeView;
  }

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


}

4、facebook的加载图片的控件

<?xml version="1.0" encoding="utf-8"?>
<com.facebook.drawee.view.SimpleDraweeView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:fresco="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  fresco:actualImageScaleType="centerCrop"
  fresco:fadeDuration="300"
  fresco:placeholderImage="@mipmap/ic_launcher">

</com.facebook.drawee.view.SimpleDraweeView>