diff --git a/src/com/zftlive/android/view/PullZoomListView.java b/src/com/zftlive/android/view/PullZoomListView.java new file mode 100644 index 0000000..d673ce7 --- /dev/null +++ b/src/com/zftlive/android/view/PullZoomListView.java @@ -0,0 +1,227 @@ +package com.zftlive.android.view; + +import android.annotation.SuppressLint; +import android.content.Context; +import android.graphics.Bitmap; +import android.graphics.Canvas; +import android.graphics.Matrix; +import android.graphics.PixelFormat; +import android.graphics.PointF; +import android.graphics.drawable.BitmapDrawable; +import android.graphics.drawable.Drawable; +import android.graphics.drawable.NinePatchDrawable; +import android.os.Handler; +import android.os.Message; +import android.util.AttributeSet; +import android.util.DisplayMetrics; +import android.view.MotionEvent; +import android.view.View; +import android.widget.ImageView; +import android.widget.ListView; +import android.widget.RelativeLayout; + +/** + * Listview下拉放大效果 ,初始化时需调用方法setHeadView + * @author 曾繁添 + * @version 1.0 + * + */ +public class PullZoomListView extends ListView { + + private final static int BACK_SCALE = 0; + private float scaleY = 0; + private boolean isBacking = false;// 是否处在回弹状态 + /** 用于记录拖拉图片移动的坐标位置 */ + private Matrix matrix = new Matrix(); + /** 用于记录图片要进行拖拉时候的坐标位置 */ + private Matrix currentMatrix = new Matrix(); + private Matrix defaultMatrix = new Matrix(); + /** 图片宽高 **/ + private float imgHeight, imgWidth; + /** 记录是拖拉照片模式还是放大缩小照片模式 0:拖拉模式，1：放大 */ + private int MODE_NORMAL = 0; + /** 拖拉照片模式 */ + private final int MODE_DRAG = 1; + /** 用于记录开始时候的坐标位置 */ + private PointF startPoint = new PointF(); + + private ImageView mHeadImage; + private Bitmap mHeadImageBmp; + + public PullZoomListView(Context context) { + this(context, null); + } + + public PullZoomListView(Context context, AttributeSet attrs) { + this(context, attrs, 0); + } + + public PullZoomListView(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + } + + /** + * 设置头部View，并指定缩放目标Imageview + * @param mHeadView Listview头部view + * @param zoomImageView 需要缩放的Imageview + */ + public void setHeadView(View mHeadView,ImageView zoomImageView){ + super.addHeaderView(mHeadView); + + //头部背景图片 + this.mHeadImage = zoomImageView; + mHeadImageBmp = drawableToBitmap(mHeadImage.getDrawable()); + float scale = (float) getScreenWidth() / (float) mHeadImageBmp.getWidth(); + matrix.postScale(scale, scale, 0, 0); + mHeadImage.setImageMatrix(matrix); + defaultMatrix.set(matrix); + + imgHeight = scale * mHeadImageBmp.getHeight(); + imgWidth = scale * mHeadImageBmp.getWidth(); + + RelativeLayout.LayoutParams relativeLayout = new RelativeLayout.LayoutParams((int) imgWidth, (int) imgHeight); + mHeadImage.setLayoutParams(relativeLayout); + } + + /** + * Drawable转成Bitmap + * @param drawable + * @return + */ + public Bitmap drawableToBitmap(Drawable drawable) { + if (drawable instanceof BitmapDrawable) { + return ((BitmapDrawable) drawable).getBitmap(); + } else if (drawable instanceof NinePatchDrawable) { + Bitmap bitmap = Bitmap + .createBitmap( + drawable.getIntrinsicWidth(), + drawable.getIntrinsicHeight(), + drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 + : Bitmap.Config.RGB_565); + Canvas canvas = new Canvas(bitmap); + drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), + drawable.getIntrinsicHeight()); + drawable.draw(canvas); + return bitmap; + } else { + return null; + } + } + + /** + * 获取屏幕宽度 + * + * @return + */ + private int getScreenWidth() { + DisplayMetrics displayMetrics = getContext().getResources() + .getDisplayMetrics(); + return displayMetrics.widthPixels; + } + + /** + * 慢慢回弹初始状态 + */ + private Handler mHandler = new Handler() { + + @Override + public void handleMessage(Message msg) { + switch (msg.what) { + case BACK_SCALE: + float scale = (scaleY / 2 + imgHeight) / (imgHeight); + if (scaleY > 0) { + isBacking = true; + matrix.set(currentMatrix); + RelativeLayout.LayoutParams relativeLayout = new RelativeLayout.LayoutParams( + (int) (scale * imgWidth), (int) (scale * imgHeight)); + mHeadImage.setLayoutParams(relativeLayout); + matrix.postScale(scale, scale, imgWidth / 2, 0); + mHeadImage.setImageMatrix(matrix); + scaleY = (float) (scaleY / 2 - 1); + mHandler.sendEmptyMessageDelayed(BACK_SCALE, 20); + } else { + scaleY = 0; + RelativeLayout.LayoutParams relativeLayout = new RelativeLayout.LayoutParams( + (int) imgWidth, (int) imgHeight); + mHeadImage.setLayoutParams(relativeLayout); + matrix.set(defaultMatrix); + mHeadImage.setImageMatrix(matrix); + isBacking = false; + } + break; + default: + break; + } + super.handleMessage(msg); + } + + }; + + /** + * 向下滑动让图片变大 + * + * @param event + * @return + */ + @SuppressLint("ClickableViewAccessibility") + public boolean onTouchEvent(MotionEvent event) { + + // 无Header + if (getHeaderViewsCount() == 0) { + return super.onTouchEvent(event); + } + + /** + * 使用switch (event.getAction())可以处理ACTION_DOWN和ACTION_UP事件； + * 使用switch (event.getAction() & MotionEvent.ACTION_MASK)就可以处理处理多点触摸的ACTION_POINTER_DOWN和ACTION_POINTER_UP事件 + */ + switch (event.getAction() & MotionEvent.ACTION_MASK) { + // 手指压下屏幕 + case MotionEvent.ACTION_DOWN: + if (isBacking) { + return super.onTouchEvent(event); + } + int[] location = new int[2]; + mHeadImage.getLocationInWindow(location); + if (location[1] >= 0) { + MODE_NORMAL = MODE_DRAG; + // 记录ImageView当前的移动位置 + currentMatrix.set(mHeadImage.getImageMatrix()); + startPoint.set(event.getX(), event.getY()); + } + break; + // 手指在屏幕上移动，改事件会被不断触发 + case MotionEvent.ACTION_MOVE: + // 拖拉图片 + if (MODE_NORMAL == MODE_DRAG) { + float dy = event.getY() - startPoint.y; // 得到y轴的移动距离 + // 在没有移动之前的位置上进行移动 + if (dy / 2 + imgHeight <= 1.5 * imgHeight) { + matrix.set(currentMatrix); + float scale = (dy / 2 + imgHeight) / (imgHeight);// 得到缩放倍数 + if (dy > 0) { + scaleY = dy; + RelativeLayout.LayoutParams relativeLayout = new RelativeLayout.LayoutParams( + (int) (scale * imgWidth), + (int) (scale * imgHeight)); + mHeadImage.setLayoutParams(relativeLayout); + matrix.postScale(scale, scale, imgWidth / 2, 0); + mHeadImage.setImageMatrix(matrix); + } + } + } + break; + // 手指离开屏幕 + case MotionEvent.ACTION_UP: + // 当触点离开屏幕，图片还原 + mHandler.sendEmptyMessage(BACK_SCALE); + + //一个非主要的手指抬起 + case MotionEvent.ACTION_POINTER_UP: + MODE_NORMAL = 0; + break; + } + + return super.onTouchEvent(event); + } +}