Android Open Source - HexNanoController_Android View Pager Indicator

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License

The source code is released under:

Code license GNU GPL v2 http://www.gnu.org/licenses/gpl.html Content license CC BY-NC-SA 4.0 http://creativecommons.org/licenses/by-nc-sa/4.0/

Java Source Code

package com.hexairbot.hexmini.ui.control;
/*from  w w w.  j a v a 2  s  . c  om*/
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.View;

import com.hexairbot.hexmini.R;


public class ViewPagerIndicator extends View 
implements OnPageChangeListener
{
  private Paint pageIndicatorPaint;
  private Paint pageIndicatorCurrentPaint;
  private float radius;
  private float gap;
  private int currentPage;
  private int pageCount;
  
  private int dy;
  private int startX;

  private OnPageChangeListener viewPagerListener;
  
  public ViewPagerIndicator(Context context, AttributeSet attrs) 
  {
    this(context, attrs, R.attr.viewPagerIndicatorStyle);  
  }
  

  
  public ViewPagerIndicator(Context context) 
  {
    this(context, null);
    }

  
  public ViewPagerIndicator(Context context, AttributeSet attrs, int defStyle) 
  {
    super(context, attrs, defStyle);  
    
    currentPage = 1;
    pageCount = 5;
    
    Resources res = context.getResources();
    
    radius = res.getDimension(R.dimen.default_circle_indicator_radius);
    gap = res.getDimension(R.dimen.default_circle_indicator_gap);
    int currentPageColor = res.getColor(R.color.default_circle_indicator_active_color);
    int pageColor = res.getColor(R.color.default_circle_indicator_color);
    
    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewPagerIndicator, defStyle, R.style.ViewPagerIndicatorStyle);
    
    radius = a.getDimension(R.styleable.ViewPagerIndicator_radius, radius);
    gap = a.getDimension(R.styleable.ViewPagerIndicator_gap, gap);
    pageColor = a.getColor(R.styleable.ViewPagerIndicator_color, pageColor);
    currentPageColor = a.getColor(R.styleable.ViewPagerIndicator_activeColor, currentPageColor);
    
    a.recycle();
    
    pageIndicatorPaint = new Paint();
    pageIndicatorPaint.setAntiAlias(true);
    pageIndicatorPaint.setColor(pageColor);
    pageIndicatorPaint.setStyle(Paint.Style.FILL);
    
    pageIndicatorCurrentPaint = new Paint(pageIndicatorPaint);
    pageIndicatorCurrentPaint.setColor(currentPageColor);
  }

  
  public void setViewPager(ViewPager viewPager)
  {
    if (viewPager.getAdapter() == null) {
      throw new IllegalStateException("View pager should be bind to adapter first.");
    }
    
    pageCount = viewPager.getAdapter().getCount();    
    currentPage = viewPager.getCurrentItem();
    viewPager.setOnPageChangeListener(this);
    
    invalidate();
  }
  
  
  public void setOnPageChangeListener(OnPageChangeListener listener)
  {
    this.viewPagerListener = listener;
  }
  
  
  @Override
  protected void onDraw(Canvas canvas) 
  {
    super.onDraw(canvas);
      
    for (int i=0; i<pageCount; ++i) {
      int dx = startX + (int)(radius + getPaddingLeft() + (i * radius * 3) + (i * gap));
      
      if (currentPage == i) {
        canvas.drawCircle(dx, dy, radius, pageIndicatorCurrentPaint);
      } else {
        canvas.drawCircle(dx, dy, radius, pageIndicatorPaint);
      }
    }
  }
  
  
  @Override
  protected void onLayout(boolean changed, int left, int top, int right,
      int bottom) 
  {
    super.onLayout(changed, left, top, right, bottom);
    
    dy = getHeight() / 2 + 1;
    startX = (getWidth() - (int)(radius + getPaddingLeft() + getPaddingRight() + (pageCount * radius * 3) + (gap * (pageCount-1)))) / 2;
  }

  
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
  {
    setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec));
  }
  
  
  private int measureWidth(int measureSpec)
  {
    int mode = MeasureSpec.getMode(measureSpec);
    int size = MeasureSpec.getSize(measureSpec);
    
    if (mode == MeasureSpec.EXACTLY) {
      return size;
    } else {
      int width = getPaddingLeft() + getPaddingRight() +
          (int)((pageCount * radius * 3) + (gap * (pageCount)));
      
      if (mode == MeasureSpec.AT_MOST) {
        return Math.min(size, width);
      }
      
      return width;
    }
  }

  
  private int measureHeight(int measureSpec)
  {
    int mode = MeasureSpec.getMode(measureSpec);
    int size = MeasureSpec.getSize(measureSpec);
    
    if (mode == MeasureSpec.EXACTLY) {
      return size;
    } else {
      
      int height = getPaddingTop() + getPaddingBottom() + (int)(radius * 3);
  
      if (mode == MeasureSpec.AT_MOST) {
        return Math.min(size, height);
      }
  
      return height;
    }
  }


  public void onPageScrollStateChanged(int arg0) 
  { 
    if (viewPagerListener != null) {
      viewPagerListener.onPageScrollStateChanged(arg0);
    }
  }


  public void onPageScrolled(int arg0, float arg1, int arg2) 
  {
    if (viewPagerListener != null) {
      viewPagerListener.onPageScrolled(arg0, arg1, arg2);
    }
  }


  public void onPageSelected(int arg0) 
  {
    currentPage = arg0;
    invalidate();
    
    if (viewPagerListener != null) {
      viewPagerListener.onPageSelected(arg0);
    }
  }
  
}

Java Source Code List

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