Android Open Source - AndroidViewPagerIndicator View Pager Indicator

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License

The source code is released under:

MIT License

Java Source Code

package com.efoad.views;
/*w ww.  j  a va2 s  .c o m*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.View;

import com.efoad.androidviewpagerindicator.R;

public class ViewPagerIndicator extends View{

  private static final int SELECTED_FACTOR = 2;
  private static final int SPACING_FACTOR = 4;
  private int numberOfItems = 0;
  private Paint paint = new Paint();
  private int color = Color.BLACK;
  private int activeItem = 0;
  private float radius = 4f;
  private ViewPager viewPager;
  
  public ViewPagerIndicator(Context context, AttributeSet attrs) {
    super(context, attrs);
     TypedArray a = context.getTheme().obtainStyledAttributes(
              attrs,
              R.styleable.ViewPagerIndicator,
              0, 0);

         try {
             radius = a.getDimension(R.styleable.ViewPagerIndicator_radius, 0);
             color = a.getColor(R.styleable.ViewPagerIndicator_color, Color.BLACK);
         } finally {
             a.recycle();
         }
    
    paint.setAntiAlias(true);
//    paint.setStrokeWidth(4f);
    paint.setColor(color);
    paint.setStyle(Paint.Style.FILL);
    paint.setStrokeJoin(Paint.Join.ROUND);
  }
  
  @Override
  protected void onDraw(Canvas canvas) {
    float x, y;
    for (int i = 0;i<numberOfItems;i++) {
      x = (i*SELECTED_FACTOR*radius) + (i*(radius*SPACING_FACTOR)) + radius*SELECTED_FACTOR;
      y = radius*SELECTED_FACTOR;
      
      if(i == activeItem) {
        canvas.drawCircle(x ,y ,
            radius*SELECTED_FACTOR, paint);
      }else {
        canvas.drawCircle(x ,y ,
            radius, paint);
      }
      
    }
    
  }


  public void setActiveItem(int activeItem) {
    this.activeItem = activeItem;
    this.invalidate();
    this.requestLayout();
  }
  

  public ViewPager getViewPager() {
    return viewPager;
  }

  public void setViewPager(ViewPager viewPager) {
    this.viewPager = viewPager;
    this.numberOfItems = this.viewPager.getAdapter().getCount();
    this.setActiveItem(viewPager.getCurrentItem());
    this.viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
      @Override
      public void onPageSelected(int position) {
        setActiveItem(position);
      }
    });
  }
  
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    // x(n) = a + d(n-1)
    // n is numberOfItems
    int n = numberOfItems;
    int measuredWidth = (int) (radius*SELECTED_FACTOR + (radius*(SELECTED_FACTOR+SPACING_FACTOR))*(n-1));
    measuredWidth += radius*SELECTED_FACTOR;
    int measuredHeight = (int) (radius*SELECTED_FACTOR)*2;
    setMeasuredDimension(measuredWidth, measuredHeight );
    
  }
  



}

Java Source Code List

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