Android Open Source - CirPageIndicator Cir Page Indicator

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License

The source code is released under:

MIT License

Java Source Code

package com.dacer.cirpageindicator;
//from  w w w  . j av  a2s .c  om
import android.content.Context;
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;

/**
 * Created by Dacer on 2/17/14.
 */
public class CirPageIndicator extends View implements ViewPager.OnPageChangeListener {

//    private ViewPager mViewpager;
    private int mCount = 0;
    private int viewWidth = 0;
    private int actualWidth = 0;
    private int selectedPos = 0;
    private Paint selectedPaint;
    private Paint unselectedPaint;
    private int dotMargin = dip2px(getContext(), 16);// Dot dotMargin Dot dotMargin Dot
                                                     //  .             .             .

    private int radius = dip2px(getContext(), 3);
    private int paddingTop = dip2px(getContext(), 2);
    private int paddingBottom = dip2px(getContext(), 2);
    public final static int UNSELECTED_COLOR = Color.parseColor("#D8D8D8");
    public final static int SELECTED_COLOR = Color.parseColor("#4A4A4A");


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

    public CirPageIndicator(Context context, AttributeSet attrs) {
        super(context, attrs);
        selectedPaint = new Paint();
        selectedPaint.setAntiAlias(true);
        selectedPaint.setColor(SELECTED_COLOR);
        selectedPaint.setStyle(Paint.Style.FILL);
        unselectedPaint = new Paint(selectedPaint);
        unselectedPaint.setColor(UNSELECTED_COLOR);
    }


    public void setViewPager(ViewPager view){
        view.setOnPageChangeListener(this);
        mCount = view.getAdapter().getCount();
        actualWidth = dotMargin * (mCount-1) + radius * 2 * mCount;
        postInvalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawDots(canvas);
    }

    private void drawDots(Canvas canvas){
        int x = (viewWidth-actualWidth)/2 + radius;
        int y = radius;
        for(int i=0; i< mCount; i++){
            boolean selected = selectedPos == i;
            canvas.drawCircle(x,y,radius,selected? selectedPaint : unselectedPaint);
            x+=(radius*2+dotMargin);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int mViewHeight = measureHeight(heightMeasureSpec);
        viewWidth = measureWidth(widthMeasureSpec);
        setMeasuredDimension(viewWidth, mViewHeight);
    }

    private int measureWidth(int measureSpec) {
        int preferred = actualWidth;
//        if (preferred<0) preferred = 0;
        return getMeasurement(measureSpec, preferred);
    }

    private int measureHeight(int measureSpec) {
        int preferred = radius*2 + paddingBottom + paddingTop;
        return getMeasurement(measureSpec, preferred);
    }

    private int getMeasurement(int measureSpec, int preferred) {
        int specSize = View.MeasureSpec.getSize(measureSpec);
        int measurement = 0;

        switch (View.MeasureSpec.getMode(measureSpec)) {
            case View.MeasureSpec.EXACTLY:
                measurement = specSize;
                break;
            case View.MeasureSpec.AT_MOST:
                measurement = Math.min(preferred, specSize);
                break;
            default:
                measurement = preferred;
                break;
        }
        return measurement;
    }

    @Override
    public void onPageScrolled(int i, float v, int i2) {

    }

    @Override
    public void onPageSelected(int i) {
        selectedPos = i;
        postInvalidate();
    }

    @Override
    public void onPageScrollStateChanged(int i) {

    }
    
    public static int dip2px(Context context, float dipValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dipValue * scale + 0.5f);
    }
}

Java Source Code List

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