Android 打造万能圆点指示器

1.首先自定义圆点的属性，动态显示，比较方便修改圆点的颜色,取名为：attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="XCircleIndicator"><!-- 被选中圆点的颜色 --><attr name="fillColor" format="color" /><!-- 未选中圆点的颜色 --><attr name="strokeColor" format="color" /><!-- 圆点的大小 --><attr name="radius" format="dimension" /><!-- 圆点间间距的大小 --><attr name="circleInterval" format="dimension" /></declare-styleable>
</resources>

2.自定义Xcircleindicator继承自View
/**
* @author 作者名易皇星
* @email 邮箱名 15095887072@163.com
* @time 2016-4-11 2016-05
* @TODO 缘分是本书，翻得不经意会错过，读得太认真会流泪！
*/

public class Xcircleindicator extends View {private int radius = 4;private final Paint mPaintStroke = new Paint(Paint.ANTI_ALIAS_FLAG);private final Paint mPaintFill = new Paint(Paint.ANTI_ALIAS_FLAG);private int currentScroll = 0;private int flowWidth = 0;private int pageTotalCount = 1;private int currentPage = 0;private int circleInterval = radius;public Xcircleindicator(Context context) {super(context);// TODO Auto-generated constructor stubinitColors(0xFFFFFFFF, 0xFFFFFFFF);}public Xcircleindicator(Context context, AttributeSet attrs) {super(context, attrs);// Retrieve styles attributsTypedArray a = context.obtainStyledAttributes(attrs,R.styleable.XCircleIndicator);try {// Retrieve the colors to be used for this view and apply them.int fillColor = a.getColor(R.styleable.XCircleIndicator_fillColor,0xFFFFFFFF);int strokeColor = a.getColor(R.styleable.XCircleIndicator_strokeColor, 0xFFFFFFFF);// Retrieve the radiusradius = (int) a.getDimension(R.styleable.XCircleIndicator_radius,radius);circleInterval = (int) a.getDimension(R.styleable.XCircleIndicator_circleInterval, radius);initColors(fillColor, strokeColor);} catch (Exception e) {e.printStackTrace();} finally {a.recycle();}}
//设置当前应显示圆点的总数public void initData(int count, int contentWidth) {this.pageTotalCount = count;this.flowWidth = contentWidth;invalidate();}
//设置当前圆点public void setCurrentPage(int currentPage) {this.currentPage = currentPage;invalidate();}public void setPageTotalCount(int pageTotalCount) {this.pageTotalCount = pageTotalCount;invalidate();}private void initColors(int fillColor, int strokeColor) {mPaintStroke.setStyle(Style.STROKE);mPaintStroke.setColor(strokeColor);mPaintFill.setStyle(Style.FILL);mPaintFill.setColor(fillColor);}//设置 被选中圆点的颜色public void setFillColor(int color) {mPaintFill.setColor(color);invalidate();}//设置  未选中圆点的颜色public void setStrokeColor(int color) {mPaintStroke.setColor(color);invalidate();}
// 圆点间间距的大小public void setCircleInterval(int circleInterval) {this.circleInterval = circleInterval;invalidate();}
// 圆点的大小 public void setRadius(int radius) {this.radius = radius;invalidate();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {setMeasuredDimension(measureWidth(widthMeasureSpec),measureHeight(heightMeasureSpec));}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);// Draw stroked circlesfor (int iLoop = 0; iLoop < pageTotalCount; iLoop++) {canvas.drawCircle(getPaddingLeft() + radius+ (iLoop * (2 * radius + circleInterval)), getPaddingTop()+ radius, radius, mPaintStroke);}int cx = 0;cx = (2 * radius + circleInterval) * currentPage;canvas.drawCircle(getPaddingLeft() + radius + cx, getPaddingTop()+ radius, radius, mPaintFill);}private int measureWidth(int measureSpec) {int result = 0;int specMode = MeasureSpec.getMode(measureSpec);int specSize = MeasureSpec.getSize(measureSpec);// We were told how big to beif (specMode == MeasureSpec.EXACTLY) {result = specSize;} else { // Calculate the width according the views countresult = getPaddingLeft() + getPaddingRight()+ (pageTotalCount * 2 * radius) + (pageTotalCount - 1)* circleInterval;// Respect AT_MOST value if that was what is called for by// measureSpecif (specMode == MeasureSpec.AT_MOST) {result = Math.min(result, specSize);}}return result;}private int measureHeight(int measureSpec) {int result = 0;int specMode = MeasureSpec.getMode(measureSpec);int specSize = MeasureSpec.getSize(measureSpec);// We were told how big to beif (specMode == MeasureSpec.EXACTLY) {result = specSize;}// Measure the heightelse {result = 2 * radius + getPaddingTop() + getPaddingBottom();// Respect AT_MOST value if that was what is called for by// measureSpecif (specMode == MeasureSpec.AT_MOST) {result = Math.min(result, specSize);}}return result;}public void onScrolled(int h, int v, int oldh, int oldv) {currentScroll = h;invalidate();}}

3.看看activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"xmlns:indicator="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"><android.support.v4.view.ViewPagerandroid:id="@+id/ViewPager"android:layout_width="match_parent"android:layout_height="match_parent"/><com.example.circleindicator.Xcircleindicatorandroid:id="@+id/Xcircleindicator"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_centerHorizontal="true"android:layout_marginBottom="10dp"indicator:circleInterval="10dp"indicator:fillColor="#F96A0E"         indicator:radius="5dp"indicator:strokeColor="#cecece" /></RelativeLayout>

4.Maintivity

public class MainActivity extends Activity {private Xcircleindicator mXcircleindicator;List<View>  lisViews=new ArrayList<View>();private ViewPager mPager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mXcircleindicator=(Xcircleindicator) findViewById(R.id.Xcircleindicator);mPager=(ViewPager) findViewById(R.id.ViewPager);//添加数据lisViews.add(LayoutInflater.from(this).inflate(R.layout.viewpaer_item_one, null));lisViews.add(LayoutInflater.from(this).inflate(R.layout.viewpaer_item_two, null));lisViews.add(LayoutInflater.from(this).inflate(R.layout.viewpaer_item_three, null));ViewPagerAdapter mAdapter=new ViewPagerAdapter(lisViews);mPager.setAdapter(mAdapter);//设置总共的页数mXcircleindicator.initData(lisViews.size(), 0);//设置当前的页面mXcircleindicator.setCurrentPage(0);mPager.setOnPageChangeListener(new OnPageChangeListener() {@Overridepublic void onPageSelected(int arg0) {mXcircleindicator.setCurrentPage(arg0);}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stub}});}

class ViewPagerAdapter extends PagerAdapter{private List<View>  lisViews;public ViewPagerAdapter(List<View>  lisViews) {this.lisViews=lisViews;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn lisViews.size();}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {// TODO Auto-generated method stubreturn arg0==arg1;//官方提示这样写  }@Overridepublic void destroyItem(View container, int position, Object object) {// TODO Auto-generated method stub((ViewPager) container).removeView(lisViews.get(position));//删除页卡  }//这个方法用来实例化页卡         @Overridepublic Object instantiateItem(View container, int position) {((ViewGroup) container).addView(lisViews.get(position), 0);//添加页卡  return lisViews.get(position);  }}

}

5.效果图：

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