Android仿京东首页画轴效果源码

package com.example.junweiliu.scrollpaintdemo.widget; import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Rect; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.Scroller; import android.widget.TextView; import com.example.junweiliu.scrollpaintdemo.R; /** * Created by junweiliu on 16/12/10. */ public class ScrollPaintView extends RelativeLayout { /** * TAG */ private static final String TAG = "ScrollPaintView"; /** * 默认滚轴高度 */ private final int DEFAULT_PAINT_SCROLL_HEIGHT = 25; /** * 默认滚动的速度 */ private final int DEFAULT_SCROLL_SPEED = 1000; /** * 默认分割点高度 */ private final int DEFAULT_PARTITION_NODE = 150; /** * 默认画轴文字大小 */ private final int DEFAULT_PAINT_SCROLL_TXT_SIZE = 16; /** * Scroller */ private Scroller mScroller; /** * 滚轴Iv */ private ImageView mPaintScrollImageView; /** * 滚轴Tv */ private TextView mPaintScrollTextView; /** * 图画Iv */ private ImageView mPaintView; /** * 画轴图 */ private Bitmap mPaintScrollBp; /** * 画轴高度 */ private int mPaintIvHeight; /** * 画轴文字 */ private String mPaintScrollTxt; /** * 画轴文字大小 */ private float mPaintScrollTxtSize; /** * 画轴文字颜色 */ private int mPaintScrollTxtColor; /** * 图画开始时的高度 */ private int mPaintStartHeight; /** * 上一次获取的Y */ private int mLastY; /** * 滚动速度 */ private int mScrollSpeed; /** * 分隔节点 */ private int partitionNode; /** * 是否是向上滚动 */ private boolean isScrllerTop = false; /** * 是否正在点击 */ private boolean isClick = false; /** * 布局参数 */ private LayoutParams lpp; /** * 屏幕高度 */ private int screenHeight; /** * 屏幕宽度 */ private int screenWidth; /** * 回调监听 */ private ScrollPaintCompleteListener listener; /** * 上一次滚动的Y值 */ private int lastScrollY; /** * 回调接口 */ public interface ScrollPaintCompleteListener { /** * 点击时的回调 */ public void onScrollTouch(TextView tv); /** * 收缩时的回调 */ public void onScrollTop(TextView tv); /** * 展开时的回调 */ public void onScrollBottom(TextView tv); /** * 滚动中的回调 */ public void onScrollMove(TextView tv); } public ScrollPaintView(Context context) { this(context, null); } public ScrollPaintView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ScrollPaintView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); // 获取属性 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.ScrollPaintView); mPaintIvHeight = (int) ta.getDimension(R.styleable.ScrollPaintView_paintScrollHeight, TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, DEFAULT_PAINT_SCROLL_HEIGHT, getResources().getDisplayMetrics())); mScrollSpeed = ta.getInteger(R.styleable.ScrollPaintView_scrollSpeed, DEFAULT_SCROLL_SPEED); partitionNode = ta.getInteger(R.styleable.ScrollPaintView_scrollPartitionNode, DEFAULT_PARTITION_NODE); mPaintScrollBp = drawableToBitamp(ta.getDrawable(R.styleable.ScrollPaintView_paintScrollSrc)); mPaintScrollTxt = ta.getString(R.styleable.ScrollPaintView_paintScrollTxt); mPaintScrollTxtColor = ta.getColor(R.styleable.ScrollPaintView_paintScrollTxtColor, Color.BLACK); mPaintScrollTxtSize = px2sp(ta.getDimensionPixelSize(R.styleable.ScrollPaintView_paintScrollTxtSize, DEFAULT_PAINT_SCROLL_TXT_SIZE)); ta.recycle(); init(); makePaintScroll(); handleView(); } /** * 设置paintView * * @param paintView */ public void setPaintView(ImageView paintView) { if (null == paintView) { Log.e(TAG, "设置的View为空"); return; } // 处理图片,对图片按照屏幕宽高比进行缩放 Bitmap bp = drawableToBitamp(paintView.getDrawable()); paintView.setImageBitmap(scaleBitmal(bp)); // 设置缩放形式 paintView.setScaleType(ImageView.ScaleType.MATRIX); mPaintView = paintView; } /** * 设置回调 */ public void setScrollPaintCompleteListener(ScrollPaintCompleteListener listener) { if (null != listener) { this.listener = listener; } } /** * 初始化 */ private void init() { mScroller = new Scroller(getContext()); lpp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); // 获取屏幕信息 DisplayMetrics displayMetrics = new DisplayMetrics(); ((Activity) getContext()).getWindowManager().getDefaultDisplay() .getMetrics(displayMetrics); // 屏幕高度 screenHeight = displayMetrics.heightPixels; // 屏幕宽度 screenWidth = displayMetrics.widthPixels; } /** * 创建滚轴 */ private void makePaintScroll() { // 如果已经存在,则不再创建 if (null != mPaintScrollImageView || null != mPaintScrollTextView) { return; } // 创建滚轴 mPaintScrollImageView = new ImageView(getContext()); LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); lp.height = mPaintIvHeight; mPaintScrollImageView.setLayoutParams(lp); mPaintScrollImageView.setScaleType(ImageView.ScaleType.FIT_XY); mPaintScrollImageView.setImageBitmap(null == mPaintScrollBp ? makeDefaultScroll() : mPaintScrollBp); addView(mPaintScrollImageView); // 创建文字 mPaintScrollTextView = new TextView(getContext()); LayoutParams lpt = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); lpt.height = mPaintIvHeight; mPaintScrollTextView.setLayoutParams(lpt); mPaintScrollTextView.setText(null == mPaintScrollTxt ? "" : mPaintScrollTxt); mPaintScrollTextView.setTextSize(mPaintScrollTxtSize); mPaintScrollTextView.setTextColor(mPaintScrollTxtColor); mPaintScrollTextView.setGravity(Gravity.CENTER); addView(mPaintScrollTextView); } /** * 测量方法 * * @param widthMeasureSpec * @param heightMeasureSpec */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (null != mPaintView && getTop() + mPaintIvHeight != mPaintView.getHeight()) { // 重新设置图画高度 mPaintStartHeight = getTop() + mPaintIvHeight / 2; lpp.height = mPaintStartHeight; mPaintView.setLayoutParams(lpp); } // 测量状态栏高度 Rect frame = new Rect(); ((Ac