自动轮播
设计思路：（如果还有除我之外的朋友看到这个，而且你有更好的思路，请不吝赐教，谢谢）
1：重写ViewPager ,增加Handler 去定时发送轮播切换任务；
2：解决手势，和轮播任务冲突，优先采用手势，有手势交互，暂停轮播任务；
3：ViewPager 绑定生命周期，不可见时，不可交互时，暂停轮播任务；
4：adapter count == 1 时，不发送轮播任务；
无限自动轮播
设计思路：
1：采用 支持轮播的ViewPager;
2: 可以选择 MAX_VALUE 的方式，做无限轮播
注意 ：
A ，无限轮播，初始position ；
B , Adapter 中做相应的取模处理；
无限自动轮播的PageIndicator
设计思路：
1：采用上面两个的基础上；
2：设计无限轮播的PageIndicator：
2.1：定义接口
//在具体的PageIndicator中定义返回真实数据量，暴露给具体的Adapter 实现， 如果5的无限轮播就是5；
//具体的PageIndicator 在获取到viepager#adapter#InfinitePageIndicator 获取到数量，显示指示器数量
public interface InfinitePageIndicator {
int realPageIndicator();
}
下面贴出
无限轮播的PageIndicator 相关代码 (没做自动)
public interface PageIndicator extends ViewPager.OnPageChangeListener {
/**
* Bind the indicator to a ViewPager.
*/
void setViewPager(ViewPager view);
/**
* Bind the indicator to a ViewPager.
*/
void setViewPager(ViewPager view, int initialPosition);
/**
* <p>Set the current page of both the ViewPager and indicator.</p>
* <p/>
* <p>This <strong>must</strong> be used if you need to set the page before
* the views are drawn on screen (e.g., default start page).</p>
*/
void setCurrentItem(int item);
/**
* Set a page change listener which will receive forwarded events.
*/
void setOnPageChangeListener(ViewPager.OnPageChangeListener listener);
/**
* Notify the indicator that the fragment list has changed.
*/
void notifyDataSetChanged();
}
package com.xxxxx.base.widget;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.drawable.Drawable;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewConfigurationCompat;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import com.xxxxx.base.R;
import static android.graphics.Paint.ANTI_ALIAS_FLAG;
import static android.widget.LinearLayout.HORIZONTAL;
import static android.widget.LinearLayout.VERTICAL;
/**
* Draws circles (one for each view). The current view position is filled and
* others are only stroked.
*/
public class InfiniteCirclePageIndicator extends View implements PageIndicator {
private static final int INVALID_POINTER = -1;
private float mRadius;
private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
private ViewPager mViewPager;
private ViewPager.OnPageChangeListener mListener;
private int mCurrentPage;
private int mSnapPage;
private float mPageOffset;
private int mScrollState;
private int mOrientation;
private boolean mCentered;
private boolean mSnap;
private int mTouchSlop;
private float mLastMotionX = -1;
private int mActivePointerId = INVALID_POINTER;
private boolean mIsDragging;
private int mLastPositionOffsetPixels;
private int mMoveFlag = 0;
public InfiniteCirclePageIndicator(Context context) {
this(context, null);
}
public InfiniteCirclePageIndicator(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.vpiCirclePageIndicatorStyle);
}
public InfiniteCirclePageIndicator(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if (isInEditMode()) {
return;
}
//Load defaults from resources
final Resources res = getResources();
final int defaultPageColor = res.getColor(R.color.base_default_circle_indicator_page_color);
final int defaultFillColor = res.getColor(R.color.base_default_circle_indicator_fill_color);
final int defaultOrientation = res
.getInteger(R.integer.base_default_circle_indicator_orientation);
final int defaultStrokeColor = res.getColor(R.color.base_default_circle_indicator_stroke_color);
final float defaultStrokeWidth = res
.getDimension(R.dimen.base_default_circle_indicator_stroke_width);
final float defaultRadius = res.getDimension(R.dimen.base_default_circle_indicator_radius);
final boolean defaultCentered = res.getBoolean(R.bool.base_default_circle_indicator_centered);
final boolean defaultSnap = res.getBoolean(R.bool.base_default_circle_indicator_snap);
//Retrieve styles attributes
TypedArray a = context
.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);
mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered);
mOrientation = a
.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation);
mPaintPageFill.setStyle(Style.FILL);
mPaintPageFill
.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor));
mPaintStroke.setStyle(Style.STROKE);
mPaintStroke.setColor(
a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor));
mPaintStroke.setStrokeWidth(
a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth));
mPaintFill.setStyle(Style.FILL);
mPaintFill
.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor));
mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius);
mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap);
Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background);
if (background != null) {
setBackgroundDrawable(background);
}
a.recycle();
final ViewConfiguration configuration = ViewConfiguration.get(context);
mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
}
public void setCentered(boolean centered) {
mCentered = centered;
invalidate();
}
public boolean isCentered() {
return mCentered;
}
public void setPageColor(int pageColor) {
mPaintPageFill.setColor(pageColor);
invalidate();
}
public int getPageColor() {
return mPaintPageFill.getColor();
}
public void setFillColor(int fillColor) {
mPaintFill.setColor(fillColor);
invalidate();
}
public int getFillColor() {
return mPaintFill.getColor();
}
public void setOrientation(int orientation) {
switch (orientation) {
case HORIZONTAL:
case VERTICAL:
mOrientation = orientation;
requestLayout();
break;
default:
throw new IllegalArgumentException(
"Orientation must be either HORIZONTAL or VERTICAL.");
}
}
public int getOrientation() {
return mOrientation;
}
public void setStrokeColor(int strokeColor) {
mPaintStroke.setColor(strokeColor);
invalidate();
}
public int getStrokeColor() {
return mPaintStroke.getColor();
}
public void setStrokeWidth(float strokeWidth) {
mPaintStroke.setStrokeWidth(strokeWidth);
invalidate();
}
public float getStrokeWidth() {
return mPaintStroke.getStrokeWidth();
}
public void setRadius(float radius) {
mRadius = radius;
invalidate();
}
public float getRadius() {
return mRadius;
}
public void setSnap(boolean snap) {
mSnap = snap;
invalidate();
}
public boolean isSnap() {
return mSnap;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mViewPager == null) {
return;
}
final int count = ((InfinitePageIndicator) mViewPager.getAdapter()).realPageIndicator();
if (count == 0) {
return;
}
int longSize;
int longPaddingBefore;
int longPaddingAfter;
int shortPaddingBefore;
if (mOrientation == HORIZONTAL) {
longSize = getWidth();
longPaddingBefore = getPaddingLeft();
longPaddingAfter = getPaddingRight();
shortPaddingBefore = getPaddingTop();
} else {
longSize = getHeight();
longPaddingBefore = getPaddingTop();
longPaddingAfter = getPaddingBottom();
shortPaddingBefore = getPaddingLeft();
}
final float threeRadius = mRadius * 4;
final float shortOffset = shortPaddingBefore + mRadius;
float longOffset = longPaddingBefore + mRadius;
if (mCentered) {
longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - (
(count * threeRadius) / 2.0f);
}
float dX;
float dY;
float pageFillRadius = mRadius;
if (mPaintStroke.getStrokeWidth() > 0) {
pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f;
}
//Draw stroked circles
for (int iLoop = 0; iLoop < count; iLoop++) {
float drawLong = longOffset + (iLoop * threeRadius);
if (mOrientation == HORIZONTAL) {
dX = drawLong;
dY = shortOffset;
} else {
dX = shortOffset;
dY = drawLong;
}
// Only paint fill if not completely transparent
if (mPaintPageFill.getAlpha() > 0) {
canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill);
}
// Only paint stroke if a stroke width was non-zero
if (pageFillRadius != mRadius) {
canvas.drawCircle(dX, dY, mRadius, mPaintStroke);
}
}
//Draw the filled circle according to the current scroll
int i = mCurrentPage % count;
if (i == 0 && mMoveFlag == -1 || i == count - 1 && mMoveFlag == 1) {
float cx = i * threeRadius;
if (mOrientation == HORIZONTAL) {
dX = longOffset + cx;
dY = shortOffset;
} else {
dX = shortOffset;
dY = longOffset + cx;
}
canvas.drawCircle(dX, dY, mRadius, mPaintFill);
return;
}
float cx = i * threeRadius;
if (!mSnap) {
cx += mPageOffset * threeRadius;
}
if (mOrientation == HORIZONTAL) {
dX = longOffset + cx;
dY = shortOffset;
} else {
dX = shortOffset;
dY = longOffset + cx;
}
canvas.drawCircle(dX, dY, mRadius, mPaintFill);
}
public boolean onTouchEvent(MotionEvent ev) {
if (super.onTouchEvent(ev)) {
return true;
}
if ((mViewPager == null) || (((InfinitePageIndicator) mViewPager.getAdapter()).realPageIndicator() == 0)) {
return false;
}
final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
switch (action) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
mLastMotionX = ev.getX();
break;
case MotionEvent.ACTION_MOVE: {
final int activePointerIndex = MotionEventCompat
.findPointerIndex(ev, mActivePointerId);
final float x = MotionEventCompat.getX(ev, activePointerIndex);
final float deltaX = x - mLastMotionX;
if (!mIsDragging) {
if (Math.abs(deltaX) > mTouchSlop) {
mIsDragging = true;
}
}
if (mIsDragging) {
mLastMotionX = x;
if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) {
mViewPager.fakeDragBy(deltaX);
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (!mIsDragging) {
final int count = ((InfinitePageIndicator) mViewPager.getAdapter()).realPageIndicator();
final int width = getWidth();
final float halfWidth = width / 2f;
final float sixthWidth = width / 6f;
if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) {
if (action != MotionEvent.ACTION_CANCEL) {
mViewPager.setCurrentItem(mCurrentPage - 1);
}
return true;
} else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) {
if (action != MotionEvent.ACTION_CANCEL) {
mViewPager.setCurrentItem(mCurrentPage + 1);
}
return true;
}
}
mIsDragging = false;
mActivePointerId = INVALID_POINTER;
if (mViewPager.isFakeDragging()) {
mViewPager.endFakeDrag();
}
break;
case MotionEventCompat.ACTION_POINTER_DOWN: {
final int index = MotionEventCompat.getActionIndex(ev);
mLastMotionX = MotionEventCompat.getX(ev, index);
mActivePointerId = MotionEventCompat.getPointerId(ev, index);
break;
}
case MotionEventCompat.ACTION_POINTER_UP:
final int pointerIndex = MotionEventCompat.getActionIndex(ev);
final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
if (pointerId == mActivePointerId) {
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
}
mLastMotionX = MotionEventCompat
.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
break;
default:
break;
}
return true;
}
@Override
public void setViewPager(ViewPager view) {
if (mViewPager == view) {
return;
}
if (mViewPager != null) {
mViewPager.setOnPageChangeListener(null);
}
if (view.getAdapter() == null) {
throw new IllegalStateException("ViewPager does not have adapter instance.");
}
mViewPager = view;
mViewPager.setOnPageChangeListener(this);
invalidate();
}
@Override
public void setViewPager(ViewPager view, int initialPosition) {
setViewPager(view);
setCurrentItem(initialPosition);
}
@Override
public void setCurrentItem(int item) {
if (mViewPager == null) {
throw new IllegalStateException("ViewPager has not been bound.");
}
mViewPager.setCurrentItem(item);
mCurrentPage = item;
invalidate();
}
@Override
public void notifyDataSetChanged() {
invalidate();
}
@Override
public void onPageScrollStateChanged(int state) {
mScrollState = state;
if (mListener != null) {
mListener.onPageScrollStateChanged(state);
}
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
if (mListener != null) {
mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
}
}
private void pageScrolledInvalidate(int position, float positionOffset, int positionOffsetPixels) {
mCurrentPage = position;
mPageOffset = positionOffset;
mLastPositionOffsetPixels = positionOffsetPixels;
invalidate();
}
@Override
public void onPageSelected(int position) {
pageScrolledInvalidate(position, 0, 0);
if (mListener != null) {
mListener.onPageSelected(position);
}
}
@Override
public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
mListener = listener;
}
/*
* (non-Javadoc)
*
* @see android.view.View#onMeasure(int, int)
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mOrientation == HORIZONTAL) {
setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec));
} else {
setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec));
}
}
/**
* Determines the width of this view
*
* @param measureSpec A measureSpec packed into an int
* @return The width of the view, honoring constraints from measureSpec
*/
private int measureLong(int measureSpec) {
int result;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) {
//We were told how big to be
result = specSize;
} else {
//Calculate the width according the views count
final int count = ((InfinitePageIndicator) mViewPager.getAdapter()).realPageIndicator();
result = (int) (getPaddingLeft() + getPaddingRight()
+ (count * 2 * mRadius) + (count - 1) * mRadius + 1);
//Respect AT_MOST value if that was what is called for by measureSpec
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
/**
* Determines the height of this view
*
* @param measureSpec A measureSpec packed into an int
* @return The height of the view, honoring constraints from measureSpec
*/
private int measureShort(int measureSpec) {
int result;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
//We were told how big to be
result = specSize;
} else {
//Measure the height
result = (int) (2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);
//Respect AT_MOST value if that was what is called for by measureSpec
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState savedState = (SavedState) state;
super.onRestoreInstanceState(savedState.getSuperState());
mCurrentPage = savedState.currentPage;
mSnapPage = savedState.currentPage;
requestLayout();
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState savedState = new SavedState(superState);
savedState.currentPage = mCurrentPage;
return savedState;
}
static class SavedState extends BaseSavedState {
int currentPage;
public SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
currentPage = in.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(currentPage);
}
}
public interface InfinitePageIndicator {
int realPageIndicator();
}
}
attrs
<declare-styleable name="ViewPagerIndicator">
<!-- Style of the circle indicator. -->
<attr name="vpiUnderlinePageIndicatorStyle" format="reference"/>
<attr name="vpiCirclePageIndicatorStyle" format="reference"/>
</declare-styleable>
<declare-styleable name="CirclePageIndicator">
<!-- Whether or not the indicators should be centered. -->
<attr name="centered"/>
<!-- Color of the filled circle that represents the current page. -->
<attr name="fillColor" format="color"/>
<!-- Color of the filled circles that represents pages. -->
<attr name="pageColor" format="color"/>
<!-- Orientation of the indicator. -->
<attr name="android:orientation"/>
<!-- Radius of the circles. This is also the spacing between circles. -->
<attr name="radius" format="dimension"/>
<!-- Whether or not the selected indicator snaps to the circles. -->
<attr name="snap" format="boolean"/>
<!-- Color of the open circles. -->
<attr name="strokeColor" format="color"/>
<!-- Width of the stroke used to draw the circles. -->
<attr name="strokeWidth"/>
<!-- View background -->
<attr name="android:background"/>
</declare-styleable>
colors
<bool name="base_default_circle_indicator_centered">true</bool>
<color name="base_default_circle_indicator_fill_color">#FFFF9800</color>
<color name="base_default_circle_indicator_page_color">#FFE9E9E9</color>
<integer name="base_default_circle_indicator_orientation">0</integer>
<dimen name="base_default_circle_indicator_radius">4dp</dimen>
<bool name="base_default_circle_indicator_snap">false</bool>
<color name="base_default_circle_indicator_stroke_color">#FFDDDDDD</color>
<dimen name="base_default_circle_indicator_stroke_width">0dp</dimen>
<bool name="base_default_underline_indicator_fades">true</bool>
<integer name="base_default_underline_indicator_fade_delay">300</integer>
<integer name="base_default_underline_indicator_fade_length">400</integer>
<color name="base_default_underline_indicator_selected_color">#FF33B5E5</color>
业务相关的Adapter
class MarktingViewPager : PagerAdapter(), InfiniteCirclePageIndicator.InfinitePageIndicator {
override fun realPageIndicator(): Int {
return REAL_COUNT
}
val mlist = ArrayList<AreaModle>()
val MAX_VALUE = 6000
var REAL_COUNT: Int = 1
var listener: OnPagerOnclickListener? = null
override fun isViewFromObject(view: View, `object`: Any): Boolean {
return view == `object`
}
open fun addList(list: ArrayList<AreaModle>?) {
mlist.clear()
if (list == null) {
notifyDataSetChanged()
return
}
if (list.size >= 3) {
mlist.addAll(list.subList(0, 3))
REAL_COUNT = 3
} else {
mlist.addAll(list)
REAL_COUNT = mlist.size
}
notifyDataSetChanged()
}
open fun getMarkCurrentPosition(): Int {
if (isOneItme()) { //如果只有一条数据 不让viewpager 滑动
return 1
}
return MAX_VALUE / 2
}
open fun isOneItme() = mlist.size == 1
override fun getCount(): Int {
if (mlist.size == 0) {
return 0
}
if (isOneItme()) {
return 1
}
return MAX_VALUE
}
override fun instantiateItem(container: ViewGroup, position: Int): Any {
...
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
container.removeView(`object` as View)
}
interface OnPagerOnclickListener {
fun onclickListener(modle: AreaModle?)
}
}
