AndroidViewPager实现滑动指示条功能

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package com.demo;

import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;

public class MyPagerAdapter extends PagerAdapter {

  private ArrayList viewLists;


  public MyPagerAdapter() {
  }

  public MyPagerAdapter(ArrayList viewLists) {
    this.viewLists = viewLists;
  }

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

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

  @NonNull
  @Override
  public Object instantiateItem(@NonNull ViewGroup container, int position) {

    container.addView(viewLists.get(position));
    return viewLists.get(position);
  }

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

package com.demo;

import android.annotation.SuppressLint;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener,
    ViewPager.OnPageChangeListener{

  private ViewPager pager1;
  private ArrayList list;
  private MyPagerAdapter myPagerAdapter;


  private ImageView img_cursor;
  private TextView tv_one;
  private TextView tv_two;
  private TextView tv_three;
  private int offSet = 0; //移动条图片的偏移量
  private int currIndex = 0; //当前页
  private int imageWidth = 0; //移动条图片的宽度
  private int One= 0;  //移动条滑动一页的距离
  private int two = 0;  //移动条滑动两页的距离

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

    init();

  }

  private void init() {
    tv_One= findViewById(R.id.tv_one);
    tv_two = findViewById(R.id.tv_two);
    tv_three = findViewById(R.id.tv_three);
    img_cursor =findViewById(R.id.img_cursor);

    /**
     * 下划线动画的相关设置
     */
    //获取图片的宽度
    imageWidth = BitmapFactory.decodeResource(getResources(),R.mipmap.line).getWidth();


    DisplayMetrics dm = new DisplayMetrics();
    //获取手机屏幕宽度
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    int screenW = dm.widthPixels;
    offSet = (screenW/3 - imageWidth) /2 ; //计算偏移量

    Matrix matrix = new Matrix();
    matrix.postTranslate(offSet,0);

    img_cursor.setImageMatrix(matrix);//设置动画初始位置

    One= offSet *2 +imageWidth;
    two = one*2;

    pager1 = findViewById(R.id.vp_show);

    //往ViewPager填充View，同时设置点击事件与页面切换事件
    list = new ArrayList<>();
    LayoutInflater li = getLayoutInflater();

    list.add(li.inflate(R.layout.view3,null,false));
    list.add(li.inflate(R.layout.view1,null,false));
    list.add(li.inflate(R.layout.view2,null,false));

    myPagerAdapter= new MyPagerAdapter(list);
    pager1.setAdapter(myPagerAdapter);
    pager1.setCurrentItem(0);     //设置ViewPager当前页，从0开始算

    tv_one.setOnClickListener(this);
    tv_two.setOnClickListener(this);
    tv_three.setOnClickListener(this);

    pager1.addOnPageChangeListener(this);

  }

  @Override
  public void onPageScrolled(int i, float v, int i1) {

  }

  @Override
  public void onPageSelected(int i) {
    Animation animation = null;
    switch (i){

      case 0:
        if (currIndex==1) {
          animation = new TranslateAnimation(one,0,0,0);
        }
        else if (currIndex==2) {
          animation = new TranslateAnimation(two,0,0,0);
        }
        break;
      case 1:
        if (currIndex==0) {
          animation = new TranslateAnimation(offSet,one,0,0);
        }
        else if (currIndex==2) {
          animation = new TranslateAnimation(two,one,0,0);
        }
        break;
      case 2:
        if (currIndex==1) {
          animation = new TranslateAnimation(one,two,0,0);
        }
        else if (currIndex==0) {
          animation = new TranslateAnimation(offSet,two,0,0);
        }
        break;
    }

    currIndex = i;
    animation.setFillAfter(true); // true表示图片停在动画结束位置
    animation.setDuration(300); //设置动画时间
    img_cursor.startAnimation(animation); //开始动画

  }

  @Override
  public void onPageScrollStateChanged(int i) {

  }

  @Override
  public void onClick(View view) {

    switch (view.getId()) {
      case R.id.tv_one: pager1.setCurrentItem(0);break;
      case R.id.tv_two: pager1.setCurrentItem(1);break;
      case R.id.tv_three: pager1.setCurrentItem(2);break;
    }

  }
}