Android无限循环与自动播放ViewPager的简单实现(广告栏)博客源码

package com.example.junweiliu.simpleindicatorview; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.view.View; import android.widget.ImageView; import android.widget.LinearLayout; /** * 轮播图圆形指示器 * Created by junweiliu on 16/6/15. */ public class IndicatorView extends LinearLayout implements ViewPager.OnPageChangeListener { /** * 需要创建的指示器个数 */ private int childViewCount = 0; /** * 设置圆点间margin */ private int mInterval; /** * 当前选中的位置 */ private int mCurrentPostion = 0; /** * 普通显示的图片 */ private Bitmap normalBp; /** * 选中时显示的图片 */ private Bitmap selectBp; /** * 设置的轮播图Vp */ private ViewPager mViewPager; /** * 指示器单项宽度 */ private int mWidth; /** * 指示器单项高度 */ private int mHeight; /** * 圆点半径 */ private int mRadius; /** * 普通状态圆点颜色 */ private int normalColor; /** * 选中状态圆点颜色 */ private int selectColor; /** * 是否是循环 */ private boolean isCirculate; /** * 对外提供ViewPager的回调接口 */ interface OnPageChangeListener { public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels); public void onPageSelected(int position); public void onPageScrollStateChanged(int state); } /** * 回调接口 */ private OnPageChangeListener mListener; /** * 设置回调 * * @param listener */ public void setOnPageChangeListener(OnPageChangeListener listener) { this.mListener = listener; } public IndicatorView(Context context) { this(context, null); } public IndicatorView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public IndicatorView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); // 获取自定义属性 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.IndicatorView); normalBp = drawableToBitamp(ta.getDrawable(R.styleable.IndicatorView_normalDrawable)); selectBp = drawableToBitamp(ta.getDrawable(R.styleable.IndicatorView_selectDrawable)); mInterval = ta.getDimensionPixelOffset(R.styleable.IndicatorView_indicatorInterval, 6); normalColor = ta.getColor(R.styleable.IndicatorView_normalColor, Color.GRAY); selectColor = ta.getColor(R.styleable.IndicatorView_selectColor, Color.RED); mRadius = ta.getInteger(R.styleable.IndicatorView_indicatorRadius, 6); isCirculate = ta.getBoolean(R.styleable.IndicatorView_isCirculate, true); ta.recycle(); // 初始化 init(); } /** * 初始化数据 */ private void init() { // 处理自定义属性 if (null == normalBp) { normalBp = makeIndicatorBp(normalColor); } if (null == selectBp) { selectBp = makeIndicatorBp(selectColor); } mWidth = normalBp.getWidth(); mHeight = normalBp.getWidth(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); // 如果是wrap_content设置为图片宽高,否则设置为父容器宽高 setMeasuredDimension((widthMode == MeasureSpec.EXACTLY) ? sizeWidth : (mWidth + mInterval) * childViewCount , (heightMode == MeasureSpec.EXACTLY) ? sizeHeight : mHeight); } /** * 重绘 * * @param canvas */ @Override protected void dispatchDraw(Canvas canvas) { // 创建指示器圆点 if (getChildCount() < childViewCount && getChildCount() == 0) { for (int i = 0; i < childViewCount; i++) { addView(makeIndicatorItem()); } // 设置默认选中指示器 setIndicatorState(mCurrentPostion); } super.dispatchDraw(canvas); } /** * 设置Vp * * @param viewpager */ public void setViewPager(ViewPager viewpager) { if (null == viewpager) { return; } if (null == viewpager.getAdapter()) { throw new IllegalStateException("ViewPager does not have adapter."); } this.mViewPager = viewpager; this.mViewPager.addOnPageChangeListener(this); this.childViewCount = viewpager.getAdapter().getCount(); invalidate(); } /** * 设置Vp * * @param viewpager * @param currposition 当前选中的位置 */ public void setViewPager(ViewPager viewpager, int currposition) { if (null == viewpager) { return; } if (null == viewpager.getAdapter()) { throw new IllegalStateException("ViewPager does not have adapter."); } this.mViewPager = viewpager; this.mViewPager.addOnPageChangeListener(this); this.childViewCount = viewpager.getAdapter().getCount(); this.mCurrentPostion = currposition; invalidate(); } /** * 设置vp * * @param childViewCount 需要显示指示器的个数 * @param viewpager vp */ public void setViewPager(int childViewCount, ViewPager viewpager) { if (null == viewpager) { return; } if (null == viewpager.getAdapter()) { throw new IllegalStateException("ViewPager does not have adapter."); } this.mViewPager = viewpager; this.mViewPager.addOnPageChangeListener(this); this.childViewCount = childViewCount; removeAllViews(); invalidate(); } /** * 创建指示器 * * @return */ private View makeIndicatorItem() { ImageView iv = new ImageView(getContext()); LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); lp.width = normalBp.getWidth(); lp.height = normalBp.getHeight(); lp.rightMargin = mInterval; iv.setImageBitmap(normalBp); iv.setLayoutParams(lp); return iv; } /** * 创建圆点指示器图片 * * @param color 创建不同颜色的指示器项 * @return */ private Bitmap makeIndicatorBp(int color) { Bitmap normalBp = Bitmap.createBitmap(mRadius * 2, mRadius * 2, Bitmap.Config.ARGB_8888); Paint paint = new Paint(); paint.setAntiAlias(true); paint.setColor(color); Canvas canvas = new Canvas(normalBp); canvas.drawCircle(mRadius, mRadius, mRadius, paint); return normalBp; } /** * drawable转bitmap * * @param drawable * @return */ private Bitmap drawableToBitamp(Drawable drawable) { if (null == drawable) { return null; } if (drawable instanceof BitmapDrawable) { BitmapDrawable bd = (BitmapDrawable) drawable; return bd.getBitmap(); } int w = drawable.getIntrinsicWidth(); int h = drawable.getIntrinsicH