Android学习笔记---实现网络图片翻页效果
来源：互联网 发布：mac哈尔滨有专柜么 编辑：程序博客网 时间：2024/05/21 23:40
每天一个小目标,早晚单车变摩托
言归正传,今天又接到了一个需求,就是要使图片翻页的时候模仿电子书的翻页效果,大概是什么样子 先来看下效果图
大概是就是这么一个样子,接下来就进入代码环节
注:以下自定义组件以及工具类都非本人亲自编写,均属于互联网
开源作品,本篇博客只讲使用,不讲原理
首先我们先来复制一个自定义组件到我们自己的项目里分别是
import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.ColorMatrix;import android.graphics.ColorMatrixColorFilter;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PointF;import android.graphics.Region;import android.graphics.drawable.GradientDrawable;import android.view.MotionEvent;import android.view.View;import android.widget.Scroller;public class Pager extends View { private int mWidth = 1280; private int mHeight = 768; private int mCornerX = 0; // 拖拽点对应的页脚 private int mCornerY = 0; private Path mPath0; private Path mPath1; Bitmap mCurPageBitmap = null; // 当前页 Bitmap mNextPageBitmap = null; PointF mTouch = new PointF(); // 拖拽点 PointF mBezierStart1 = new PointF(); // 贝塞尔曲线起始点 PointF mBezierControl1 = new PointF(); // 贝塞尔曲线控制点 PointF mBeziervertex1 = new PointF(); // 贝塞尔曲线顶点 PointF mBezierEnd1 = new PointF(); // 贝塞尔曲线结束点 PointF mBezierStart2 = new PointF(); // 另一条贝塞尔曲线 PointF mBezierControl2 = new PointF(); PointF mBeziervertex2 = new PointF(); PointF mBezierEnd2 = new PointF(); float mMiddleX; float mMiddleY; float mDegrees; float mTouchToCornerDis; ColorMatrixColorFilter mColorMatrixFilter; Matrix mMatrix; float[] mMatrixArray = { 0, 0, 0, 0, 0, 0, 0, 0, 1.0f }; boolean mIsRTandLB; // 是否属于右、上、左、下 float mMaxLength = (float) Math.hypot(mWidth, mHeight); int[] mBackShadowColors; int[] mFrontShadowColors; GradientDrawable mBackShadowDrawableLR; GradientDrawable mBackShadowDrawableRL; GradientDrawable mFolderShadowDrawableLR; GradientDrawable mFolderShadowDrawableRL; GradientDrawable mFrontShadowDrawableHBT; GradientDrawable mFrontShadowDrawableHTB; GradientDrawable mFrontShadowDrawableVLR; GradientDrawable mFrontShadowDrawableVRL; Paint mPaint; Scroller mScroller; public Pager(Context context, int screenWidth, int screenHeight) { super(context); this.mWidth = screenWidth; // Pager 宽和高 this.mHeight = screenHeight; mPath0 = new Path(); mPath1 = new Path(); createDrawable(); mPaint = new Paint(); mPaint.setStyle(Paint.Style.FILL); ColorMatrix cm = new ColorMatrix(); float array[] = { 0.55f, 0, 0, 0, 80.0f, 0, 0.55f, 0, 0, 80.0f, 0, 0, 0.55f, 0, 80.0f, 0, 0, 0, 0.2f, 0 }; cm.set(array); mColorMatrixFilter = new ColorMatrixColorFilter(cm); mMatrix = new Matrix(); mScroller = new Scroller(getContext()); mTouch.x = 0.01f; // 不让x,y为0,否则在点计算时会有问题 mTouch.y = 0.01f; } /** 计算拖拽点对应的拖拽脚 */ public void calcCornerXY(float x, float y) { if (x <= mWidth / 2) mCornerX = 0; else mCornerX = mWidth; if (y <= mHeight / 2) mCornerY = 0; else mCornerY = mHeight; if ((mCornerX == 0 && mCornerY == mHeight) || (mCornerX == mWidth && mCornerY == 0)) mIsRTandLB = true; else mIsRTandLB = false; } public boolean doTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_MOVE) { mTouch.x = event.getX(); mTouch.y = event.getY(); this.postInvalidate(); } if (event.getAction() == MotionEvent.ACTION_DOWN) { mTouch.x = event.getX(); mTouch.y = event.getY(); // calcCornerXY(mTouch.x, mTouch.y); // this.postInvalidate(); } if (event.getAction() == MotionEvent.ACTION_UP) { if (canDragOver()) { startAnimation(1200); } else { mTouch.x = mCornerX - 0.09f; mTouch.y = mCornerY - 0.09f; } this.postInvalidate(); } // return super.onTouchEvent(event); return true; } /** 求解直线P1P2和直线P3P4的交点坐标 */ public PointF getCross(PointF P1, PointF P2, PointF P3, PointF P4) { PointF CrossP = new PointF(); // 二元函数通式： y=ax+b float a1 = (P2.y - P1.y) / (P2.x - P1.x); float b1 = ((P1.x * P2.y) - (P2.x * P1.y)) / (P1.x - P2.x); float a2 = (P4.y - P3.y) / (P4.x - P3.x); float b2 = ((P3.x * P4.y) - (P4.x * P3.y)) / (P3.x - P4.x); CrossP.x = (b2 - b1) / (a1 - a2); CrossP.y = a1 * CrossP.x + b1; return CrossP; } private void calcPoints() { mMiddleX = (mTouch.x + mCornerX) / 2; mMiddleY = (mTouch.y + mCornerY) / 2; mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY) * (mCornerY - mMiddleY) / (mCornerX - mMiddleX); mBezierControl1.y = mCornerY; mBezierControl2.x = mCornerX; mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY); mBezierStart1.x = mBezierControl1.x - (mCornerX - mBezierControl1.x) / 2; mBezierStart1.y = mCornerY; // 当mBezierStart1.x < 0或者mBezierStart1.x > 480时 // 如果继续翻页，会出现BUG故在此限制 if (mTouch.x > 0 && mTouch.x < mWidth) { if (mBezierStart1.x < 0 || mBezierStart1.x > mWidth) { if (mBezierStart1.x < 0) mBezierStart1.x = mWidth - mBezierStart1.x; float f1 = Math.abs(mCornerX - mTouch.x); float f2 = mWidth * f1 / mBezierStart1.x; mTouch.x = Math.abs(mCornerX - f2); float f3 = Math.abs(mCornerX - mTouch.x) * Math.abs(mCornerY - mTouch.y) / f1; mTouch.y = Math.abs(mCornerY - f3); mMiddleX = (mTouch.x + mCornerX) / 2; mMiddleY = (mTouch.y + mCornerY) / 2; mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY) * (mCornerY - mMiddleY) / (mCornerX - mMiddleX); mBezierControl1.y = mCornerY; mBezierControl2.x = mCornerX; mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY); mBezierStart1.x = mBezierControl1.x - (mCornerX - mBezierControl1.x) / 2; } } mBezierStart2.x = mCornerX; mBezierStart2.y = mBezierControl2.y - (mCornerY - mBezierControl2.y) / 2; mTouchToCornerDis = (float) Math.hypot((mTouch.x - mCornerX), (mTouch.y - mCornerY)); mBezierEnd1 = getCross(mTouch, mBezierControl1, mBezierStart1, mBezierStart2); mBezierEnd2 = getCross(mTouch, mBezierControl2, mBezierStart1, mBezierStart2); /* * mBeziervertex1.x 推导 * ((mBezierStart1.x+mBezierEnd1.x)/2+mBezierControl1.x)/2 化简等价于 * (mBezierStart1.x+ 2*mBezierControl1.x+mBezierEnd1.x) / 4 */ mBeziervertex1.x = (mBezierStart1.x + 2 * mBezierControl1.x + mBezierEnd1.x) / 4; mBeziervertex1.y = (2 * mBezierControl1.y + mBezierStart1.y + mBezierEnd1.y) / 4; mBeziervertex2.x = (mBezierStart2.x + 2 * mBezierControl2.x + mBezierEnd2.x) / 4; mBeziervertex2.y = (2 * mBezierControl2.y + mBezierStart2.y + mBezierEnd2.y) / 4; } private void drawCurrentPageArea(Canvas canvas, Bitmap bitmap, Path path) { mPath0.reset(); mPath0.moveTo(mBezierStart1.x, mBezierStart1.y); mPath0.quadTo(mBezierControl1.x, mBezierControl1.y, mBezierEnd1.x, mBezierEnd1.y); mPath0.lineTo(mTouch.x, mTouch.y); mPath0.lineTo(mBezierEnd2.x, mBezierEnd2.y); mPath0.quadTo(mBezierControl2.x, mBezierControl2.y, mBezierStart2.x, mBezierStart2.y); mPath0.lineTo(mCornerX, mCornerY); mPath0.close(); canvas.save(); canvas.clipPath(path, Region.Op.XOR); canvas.drawBitmap(bitmap, 0, 0, null); canvas.restore(); } private void drawNextPageAreaAndShadow(Canvas canvas, Bitmap bitmap) { mPath1.reset(); mPath1.moveTo(mBezierStart1.x, mBezierStart1.y); mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y); mPath1.lineTo(mBeziervertex2.x, mBeziervertex2.y); mPath1.lineTo(mBezierStart2.x, mBezierStart2.y); mPath1.lineTo(mCornerX, mCornerY); mPath1.close(); mDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl1.x - mCornerX, mBezierControl2.y - mCornerY)); int leftx; int rightx; GradientDrawable mBackShadowDrawable; if (mIsRTandLB) { leftx = (int) (mBezierStart1.x); rightx = (int) (mBezierStart1.x + mTouchToCornerDis / 4); mBackShadowDrawable = mBackShadowDrawableLR; } else { leftx = (int) (mBezierStart1.x - mTouchToCornerDis / 4); rightx = (int) mBezierStart1.x; mBackShadowDrawable = mBackShadowDrawableRL; } canvas.save(); canvas.clipPath(mPath0); canvas.clipPath(mPath1, Region.Op.INTERSECT); canvas.drawBitmap(bitmap, 0, 0, null); canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y); mBackShadowDrawable.setBounds(leftx, (int) mBezierStart1.y, rightx, (int) (mMaxLength + mBezierStart1.y)); mBackShadowDrawable.draw(canvas); canvas.restore(); } public void setBitmaps(Bitmap bm1, Bitmap bm2) { mCurPageBitmap = bm1; mNextPageBitmap = bm2; } public void setScreen(int w, int h) { mWidth = w; mHeight = h; } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(0xFFAAAAAA); calcPoints(); drawCurrentPageArea(canvas, mCurPageBitmap, mPath0); drawNextPageAreaAndShadow(canvas, mNextPageBitmap); drawCurrentPageShadow(canvas); drawCurrentBackArea(canvas, mCurPageBitmap); } /** 创建阴影的GradientDrawable */ private void createDrawable() { int[] color = { 0x333333, 0xb0333333 }; mFolderShadowDrawableRL = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, color); mFolderShadowDrawableRL.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFolderShadowDrawableLR = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, color); mFolderShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT); mBackShadowColors = new int[] { 0xff111111, 0x111111 }; mBackShadowDrawableRL = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, mBackShadowColors); mBackShadowDrawableRL.setGradientType(GradientDrawable.LINEAR_GRADIENT); mBackShadowDrawableLR = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, mBackShadowColors); mBackShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowColors = new int[] { 0x80111111, 0x111111 }; mFrontShadowDrawableVLR = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, mFrontShadowColors); mFrontShadowDrawableVLR.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowDrawableVRL = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, mFrontShadowColors); mFrontShadowDrawableVRL.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowDrawableHTB = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, mFrontShadowColors); mFrontShadowDrawableHTB.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowDrawableHBT = new GradientDrawable(GradientDrawable.Orientation.BOTTOM_TOP, mFrontShadowColors); mFrontShadowDrawableHBT.setGradientType(GradientDrawable.LINEAR_GRADIENT); } /** 绘制翻起页的阴影 */ public void drawCurrentPageShadow(Canvas canvas) { double degree; if (mIsRTandLB) { degree = Math.PI / 4 - Math.atan2(mBezierControl1.y - mTouch.y, mTouch.x - mBezierControl1.x); } else { degree = Math.PI / 4 - Math.atan2(mTouch.y - mBezierControl1.y, mTouch.x - mBezierControl1.x); } // 翻起页阴影顶点与touch点的距离 double d1 = (float) 25 * 1.414 * Math.cos(degree); double d2 = (float) 25 * 1.414 * Math.sin(degree); float x = (float) (mTouch.x + d1); float y; if (mIsRTandLB) { y = (float) (mTouch.y + d2); } else { y = (float) (mTouch.y - d2); } mPath1.reset(); mPath1.moveTo(x, y); mPath1.lineTo(mTouch.x, mTouch.y); mPath1.lineTo(mBezierControl1.x, mBezierControl1.y); mPath1.lineTo(mBezierStart1.x, mBezierStart1.y); mPath1.close(); float rotateDegrees; canvas.save(); canvas.clipPath(mPath0, Region.Op.XOR); canvas.clipPath(mPath1, Region.Op.INTERSECT); int leftx; int rightx; GradientDrawable mCurrentPageShadow; if (mIsRTandLB) { leftx = (int) (mBezierControl1.x); rightx = (int) mBezierControl1.x + 25; mCurrentPageShadow = mFrontShadowDrawableVLR; } else { leftx = (int) (mBezierControl1.x - 25); rightx = (int) mBezierControl1.x + 1; mCurrentPageShadow = mFrontShadowDrawableVRL; } rotateDegrees = (float) Math.toDegrees(Math.atan2(mTouch.x - mBezierControl1.x, mBezierControl1.y - mTouch.y)); canvas.rotate(rotateDegrees, mBezierControl1.x, mBezierControl1.y); mCurrentPageShadow.setBounds(leftx, (int) (mBezierControl1.y - mMaxLength), rightx, (int) (mBezierControl1.y)); mCurrentPageShadow.draw(canvas); canvas.restore(); mPath1.reset(); mPath1.moveTo(x, y); mPath1.lineTo(mTouch.x, mTouch.y); mPath1.lineTo(mBezierControl2.x, mBezierControl2.y); mPath1.lineTo(mBezierStart2.x, mBezierStart2.y); mPath1.close(); canvas.save(); canvas.clipPath(mPath0, Region.Op.XOR); canvas.clipPath(mPath1, Region.Op.INTERSECT); if (mIsRTandLB) { leftx = (int) (mBezierControl2.y); rightx = (int) (mBezierControl2.y + 25); mCurrentPageShadow = mFrontShadowDrawableHTB; } else { leftx = (int) (mBezierControl2.y - 25); rightx = (int) (mBezierControl2.y + 1); mCurrentPageShadow = mFrontShadowDrawableHBT; } rotateDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl2.y - mTouch.y, mBezierControl2.x - mTouch.x)); canvas.rotate(rotateDegrees, mBezierControl2.x, mBezierControl2.y); float temp; if (mBezierControl2.y < 0) temp = mBezierControl2.y - mHeight; else temp = mBezierControl2.y; int hmg = (int) Math.hypot(mBezierControl2.x, temp); if (hmg > mMaxLength) mCurrentPageShadow.setBounds((int) (mBezierControl2.x - 25) - hmg, leftx, (int) (mBezierControl2.x + mMaxLength) - hmg, rightx); else mCurrentPageShadow.setBounds((int) (mBezierControl2.x - mMaxLength), leftx, (int) (mBezierControl2.x), rightx); mCurrentPageShadow.draw(canvas); canvas.restore(); } /** 绘制翻起页背面 */ private void drawCurrentBackArea(Canvas canvas, Bitmap bitmap) { int i = (int) (mBezierStart1.x + mBezierControl1.x) / 2; float f1 = Math.abs(i - mBezierControl1.x); int i1 = (int) (mBezierStart2.y + mBezierControl2.y) / 2; float f2 = Math.abs(i1 - mBezierControl2.y); float f3 = Math.min(f1, f2); mPath1.reset(); mPath1.moveTo(mBeziervertex2.x, mBeziervertex2.y); mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y); mPath1.lineTo(mBezierEnd1.x, mBezierEnd1.y); mPath1.lineTo(mTouch.x, mTouch.y); mPath1.lineTo(mBezierEnd2.x, mBezierEnd2.y); mPath1.close(); GradientDrawable mFolderShadowDrawable; int left; int right; if (mIsRTandLB) { left = (int) (mBezierStart1.x - 1); right = (int) (mBezierStart1.x + f3 + 1); mFolderShadowDrawable = mFolderShadowDrawableLR; } else { left = (int) (mBezierStart1.x - f3 - 1); right = (int) (mBezierStart1.x + 1); mFolderShadowDrawable = mFolderShadowDrawableRL; } canvas.save(); canvas.clipPath(mPath0); canvas.clipPath(mPath1, Region.Op.INTERSECT); mPaint.setColorFilter(mColorMatrixFilter); float dis = (float) Math.hypot(mCornerX - mBezierControl1.x, mBezierControl2.y - mCornerY); float f8 = (mCornerX - mBezierControl1.x) / dis; float f9 = (mBezierControl2.y - mCornerY) / dis; mMatrixArray[0] = 1 - 2 * f9 * f9; mMatrixArray[1] = 2 * f8 * f9; mMatrixArray[3] = mMatrixArray[1]; mMatrixArray[4] = 1 - 2 * f8 * f8; mMatrix.reset(); mMatrix.setValues(mMatrixArray); mMatrix.preTranslate(-mBezierControl1.x, -mBezierControl1.y); mMatrix.postTranslate(mBezierControl1.x, mBezierControl1.y); canvas.drawBitmap(bitmap, mMatrix, mPaint); //canvas.drawBitmap(bitmap, mMatrix, null); mPaint.setColorFilter(null); canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y); mFolderShadowDrawable.setBounds(left, (int) mBezierStart1.y, right, (int) (mBezierStart1.y + mMaxLength)); mFolderShadowDrawable.draw(canvas); canvas.restore(); } public void computeScroll() { super.computeScroll(); if (mScroller.computeScrollOffset()) { float x = mScroller.getCurrX(); float y = mScroller.getCurrY(); mTouch.x = x; mTouch.y = y; postInvalidate(); } } private void startAnimation(int delayMillis) { int dx, dy; // dx 水平方向滑动的距离，负值会使滚动向左滚动 dy 垂直方向滑动的距离，负值会使滚动向上滚动 if (mCornerX > 0) { dx = -(int) (mWidth + mTouch.x); } else { dx = (int) (mWidth - mTouch.x + mWidth); } if (mCornerY > 0) { dy = (int) (mHeight - mTouch.y); } else { dy = (int) (1 - mTouch.y); // 防止mTouch.y最终变为0 } mScroller.startScroll((int) mTouch.x, (int) mTouch.y, dx, dy, delayMillis); } public void abortAnimation() { if (!mScroller.isFinished()) { mScroller.abortAnimation(); } } public boolean canDragOver() { if (mTouchToCornerDis > mWidth / 10) return true; return false; } /** 是否从左边翻向右边 */ public boolean DragToRight() { if (mCornerX > 0) return false; return true; }
还有一个工具类
import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Paint.Align;public class PagerFactory { private Context mContext; private Bitmap m_book_bg = null; private int m_backColor = 0xffff9e85; // 背景颜色 private boolean m_isfirstPage,m_islastPage; private Paint mPaint; public PagerFactory(Context context) { mContext = context; mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setTextAlign(Align.LEFT); mPaint.setColor(m_backColor); } public void onDraw(Canvas c) { if (m_book_bg == null) c.drawColor(m_backColor); else c.drawBitmap(m_book_bg, 0, 0, null); } public void onDraw(Canvas c, Bitmap bitmap){ c.drawBitmap(bitmap, 0, 0, null); } public void setBgBitmap(Bitmap BG) { m_book_bg = BG; }
好了 既然东西已经有了 那么怎么用呢
我们在xml里面写一个
acitivity.main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.ht.sks.mypage.MainActivity"> <LinearLayout android:orientation="vertical" android:id="@+id/typeview" android:layout_width="match_parent" android:layout_height="300dp"/></RelativeLayout>
布局里面这个LinearLayout主要是用来展示图片的位置,这样就可以随心所欲的使用了,
下面在代码中初始化翻页组件
/** * 初始化组件 */ private void initView() { DisplayMetrics displayMetrics = getResources().getDisplayMetrics(); screenWidth = displayMetrics.widthPixels; screenHeight = displayMetrics.heightPixels; pager = new Pager(this, screenWidth, screenHeight); //下面这段代码是全屏的,不太方便使用,注掉/* FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); addContentView(pager, layoutParams);*/ //把咱们的图片加入到之前的布局里 linearLayout.addView(pager); //图片类型 mCurPageBitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888); mNextPageBitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888); mCurPageCanvas = new Canvas(mCurPageBitmap); mNextPageCanvas = new Canvas(mNextPageBitmap); pagerFactory = new PagerFactory(getApplicationContext()); pager.setBitmaps(mCurPageBitmap, mCurPageBitmap); //翻页监听 pager.setOnTouchListener(new View.OnTouchListener() { private int count = pages.length; private int currentIndex = 0; private int lastIndex = 0; private Bitmap lastBitmap = null; @Override public boolean onTouch(View v, MotionEvent e) { boolean ret = false; if (v == pager) { if (e.getAction() == MotionEvent.ACTION_DOWN) { pager.calcCornerXY(e.getX(), e.getY()); lastBitmap = currentBitmap; lastIndex = currentIndex; pagerFactory.onDraw(mCurPageCanvas, currentBitmap); if (pager.DragToRight()) { // 向右滑动，显示前一页 if (currentIndex == 0) return false; pager.abortAnimation(); currentIndex--; loadImage(mNextPageCanvas, currentIndex); Toast.makeText(MainActivity.this, "当前第"+currentIndex+"页", Toast.LENGTH_SHORT).show(); } else { // 向左滑动，显示后一页 if (currentIndex + 1 == count) return false; pager.abortAnimation(); currentIndex++; //加载图片并显示出来 loadImage(mNextPageCanvas, currentIndex); Toast.makeText(MainActivity.this, "当前第"+currentIndex+"页", Toast.LENGTH_SHORT).show(); } } else if (e.getAction() == MotionEvent.ACTION_MOVE) { } else if (e.getAction() == MotionEvent.ACTION_UP) { if (!pager.canDragOver()) { currentIndex = lastIndex; currentBitmap = lastBitmap; } } ret = pager.doTouchEvent(e); return ret; } return false; } }); }
以及请求网络图片并设置的方法
/** * 请求图片并显示 * @param canvas * @param index */private void loadImage(final Canvas canvas, int index) { //使用封装的Fresco图片加载框架的工具类请求得到网络图片的Bitmap FrescoLoadUtil.getInstance().loadImageBitmap(pages[index], new FrescoBitmapCallback<Bitmap>() { @Override public void onSuccess(Uri uri, Bitmap result) { //原来的大小 int width = result.getWidth(); int height = result.getHeight(); // 设置想要的大小 int newWidth = linearLayout.getWidth(); int newHeight = linearLayout.getHeight(); // 计算缩放比例 float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; // 取得想要缩放的matrix参数 Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // 修改得到的bitmap的大小,根据个人需求自行设置 Bitmap bitMap = Bitmap.createBitmap(result, 0, 0, width, height, matrix, true); currentBitmap = bitMap; //传入得到的图片 pagerFactory.onDraw(canvas, bitMap); pager.setBitmaps(mCurPageBitmap, mNextPageBitmap); pager.postInvalidate(); } @Override public void onFailure(Uri uri, Throwable throwable) { } @Override public void onCancel(Uri uri) { } });}
好了 到这里 一个翻页效果就可以完成了
整体代码
import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Matrix;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout;import android.widget.Toast;import com.facebook.drawee.backends.pipeline.Fresco;public class MainActivity extends AppCompatActivity { private LinearLayout linearLayout; private Pager pager; private PagerFactory pagerFactory; private Bitmap currentBitmap, mCurPageBitmap, mNextPageBitmap; private Canvas mCurPageCanvas, mNextPageCanvas; //图片数组 private static final String[] pages = {"http://pic.58pic.com/58pic/15/62/55/37Z58PICmtR_1024.jpg","http://pic1.16pic.com/00/03/24/16pic_324498_b.jpg","http://pic2.cxtuku.com/00/15/88/b305b7673527.jpg","http://pic18.nipic.com/20120105/293411_145330148396_2.jpg", "http://pic36.nipic.com/20131224/9904897_144358081000_2.jpg", "http://img2.makepolo.net/images/formals/img/product/430/174/6356faae42f9a838bfc036bb49d74656.jpg"}; private int screenWidth; private int screenHeight; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化框架 Fresco.initialize(this); //初始化布局; linearLayout = (LinearLayout) findViewById(R.id.typeview); //初始化自定义组件 initView(); //默认加载第一张图 loadImage(mNextPageCanvas, 0); } /** * 初始化组件 */ private void initView() { DisplayMetrics displayMetrics = getResources().getDisplayMetrics(); screenWidth = displayMetrics.widthPixels; screenHeight = displayMetrics.heightPixels; pager = new Pager(this, screenWidth, screenHeight); //下面这段代码是全屏的,不太方便使用,注掉/* FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); addContentView(pager, layoutParams);*/ //把咱们的图片加入到之前的布局里 linearLayout.addView(pager); //图片类型 mCurPageBitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888); mNextPageBitmap = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888); mCurPageCanvas = new Canvas(mCurPageBitmap); mNextPageCanvas = new Canvas(mNextPageBitmap); pagerFactory = new PagerFactory(MainActivity.this); pager.setBitmaps(mCurPageBitmap, mCurPageBitmap); //翻页监听 pager.setOnTouchListener(new View.OnTouchListener() { private int count = pages.length; private int currentIndex = 0; private int lastIndex = 0; private Bitmap lastBitmap = null; @Override public boolean onTouch(View v, MotionEvent e) { boolean ret = false; if (v == pager) { if (e.getAction() == MotionEvent.ACTION_DOWN) { pager.calcCornerXY(e.getX(), e.getY()); lastBitmap = currentBitmap; lastIndex = currentIndex; pagerFactory.onDraw(mCurPageCanvas, currentBitmap); if (pager.DragToRight()) { // 向右滑动，显示前一页 if (currentIndex == 0) return false; pager.abortAnimation(); currentIndex--; loadImage(mNextPageCanvas, currentIndex); Toast.makeText(MainActivity.this, "当前第"+currentIndex+"页", Toast.LENGTH_SHORT).show(); } else { // 向左滑动，显示后一页 if (currentIndex + 1 == count) return false; pager.abortAnimation(); currentIndex++; //加载图片并显示出来 loadImage(mNextPageCanvas, currentIndex); Toast.makeText(MainActivity.this, "当前第"+currentIndex+"页", Toast.LENGTH_SHORT).show(); } } else if (e.getAction() == MotionEvent.ACTION_MOVE) { } else if (e.getAction() == MotionEvent.ACTION_UP) { if (!pager.canDragOver()) { currentIndex = lastIndex; currentBitmap = lastBitmap; } } ret = pager.doTouchEvent(e); return ret; } return false; } }); } /** * 请求图片并显示 * @param canvas * @param index */ private void loadImage(final Canvas canvas, int index) { //使用封装的Fresco图片加载框架的工具类请求得到网络图片的Bitmap FrescoLoadUtil.getInstance().loadImageBitmap(pages[index], new FrescoBitmapCallback<Bitmap>() { @Override public void onSuccess(Uri uri, Bitmap result) { //原来的大小 int width = result.getWidth(); int height = result.getHeight(); // 设置想要的大小 int newWidth = linearLayout.getWidth(); int newHeight = linearLayout.getHeight(); // 计算缩放比例 float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; // 取得想要缩放的matrix参数 Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // 修改得到的bitmap的大小,根据个人需求自行设置 Bitmap bitMap = Bitmap.createBitmap(result, 0, 0, width, height, matrix, true); currentBitmap = bitMap; //传入得到的图片 pagerFactory.onDraw(canvas, bitMap); pager.setBitmaps(mCurPageBitmap, mNextPageBitmap); pager.postInvalidate(); } @Override public void onFailure(Uri uri, Throwable throwable) { } @Override public void onCancel(Uri uri) { } }); }}
好了到这一步 我们的工作就以及完成了,让我们来看看效果吧
demo下载地址
http://download.csdn.net/download/crackgmkey/10018821
阅读全文
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