Android自定义RecyclerView实现不固定刻度的刻度尺
本文实例为大家分享了自定义RecyclerView实现不固定刻度的刻度尺的具体代码,供大家参考,具体内容如下
##不均匀刻度效果图
##等比例刻度效果图
实现功能目前
1、实现类似日期/分类等大小不固定的水平刻度尺效果
2、实现标准刻度尺效果
3、监听RecyclerView滑动时居中条目
4、去掉边缘阴影
定义RecyclerView
public class CenterRecyclerView extends RecyclerView { //设置RecyclerView的速度 private static final int MAXIMUM_FLING_VELOCITY = 3000; //画中轴线 private Paint mCenterLinePaint; private Context context; private CenterLayoutManager mLayoutManager; private Paint mTextPaint; private String text = ""; private String textUnit = ""; private Paint mTextUnitPaint; private int mWidth; private int mHeight; private int mLineStartY; private int mLineEndY; private int mTextStartY; public CenterRecyclerView(@NonNull Context context) { this(context, null); } public CenterRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs) { this(context, attrs, -1); } public CenterRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context, attrs); } private void init(Context context, AttributeSet attrs) { this.context = context; initPaint(); } public void setTypeface(Typeface typeface) { mTextPaint.setTypeface(typeface); mTextUnitPaint.setTypeface(typeface); } private void initPaint() { mCenterLinePaint = new Paint(); mCenterLinePaint.setAntiAlias(true); mCenterLinePaint.setStrokeWidth(ScreenUtil.dip2px(context, 4)); mCenterLinePaint.setTextAlign(Paint.Align.CENTER); mCenterLinePaint.setColor(0xff6e9fff); mTextUnitPaint = new Paint(); mTextUnitPaint.setStyle(Paint.Style.FILL); mTextUnitPaint.setStrokeWidth(ScreenUtil.dip2px(context, 4)); mTextUnitPaint.setTextSize(ScreenUtil.dip2px(context, 15)); mTextUnitPaint.setColor(Color.parseColor("#DD5F00")); mTextPaint = new Paint(); mTextPaint.setStyle(Paint.Style.FILL); mTextPaint.setStrokeWidth(ScreenUtil.dip2px(context, 4)); mTextPaint.setTextSize(ScreenUtil.dip2px(context, 60)); mTextPaint.setColor(Color.parseColor("#DD5F00")); mTextPaint.setTextAlign(Paint.Align.CENTER); } @Override public void addOnScrollListener(@NonNull OnScrollListener listener) { super.addOnScrollListener(listener); postInvalidate(); } @Override protected void onMeasure(int widthSpec, int heightSpec) { super.onMeasure(widthSpec, heightSpec); } //获取相关参数 @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); mWidth = getWidth(); mHeight = getHeight(); int lineHeight = ScreenUtil.dip2px(context, 58); mLineStartY = mHeight / 2 - lineHeight / 2; mLineEndY = mHeight / 2 + lineHeight / 2; mTextStartY = mHeight / 2 - ScreenUtil.dip2px(context, 55); } @Override public void draw(Canvas c) { super.draw(c); Log.d("szjjyh", "draw: " + getWidth()); drawCenterLine(c); drawText(c); } //画线 private void drawCenterLine(Canvas canvas) { canvas.drawLine(mWidth / 2, mLineStartY, mWidth / 2, mLineEndY, mCenterLinePaint); } //画字/画单位 private void drawText(Canvas c) { c.drawText(text, mWidth / 2, mTextStartY, mTextPaint); if (textUnit != null && textUnit.length() != 0) { float textWidth = mTextPaint.measureText(text); c.drawText(textUnit, (mWidth + textWidth) / 2, mTextStartY, mTextUnitPaint); } } public String getText() { return text; } public void setText(String text) { if (text == null) { return; } this.text = text; } public String getTextUnit() { return textUnit; } public void setTextUnit(String textUnit) { if (textUnit == null) { return; } this.textUnit = textUnit; } @Override public void setAdapter(@Nullable Adapter adapter) { super.setAdapter(adapter); } @Override public void setLayoutManager(@Nullable LayoutManager layout) { super.setLayoutManager(layout); mLayoutManager = (CenterLayoutManager) layout; } @Override public boolean fling(int velocityX, int velocityY) { velocityX = solveVelocity(velocityX); velocityY = solveVelocity(velocityY); return super.fling(velocityX, velocityY); } private int solveVelocity(int velocity) { if (velocity > 0) { return Math.min(velocity, MAXIMUM_FLING_VELOCITY); } else { return Math.max(velocity, -MAXIMUM_FLING_VELOCITY); } } // @Override // protected float getLeftFadingEdgeStrength() { // return 0; // } }
定义LinearLayoutManager
public class CenterLayoutManager extends LinearLayoutManager { public CenterLayoutManager(Context context) { super(context); } public CenterLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); } public CenterLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } //计算偏移量自己适配 @Override public void scrollToPosition(int position) { scrollToPositionWithOffset(position,-15); } @Override public void scrollToPositionWithOffset(int position, int offset) { super.scrollToPositionWithOffset(position, offset); } @Override public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) { RecyclerView.SmoothScroller smoothScroller = new CenterSmoothScroller(recyclerView.getContext()); smoothScroller.setTargetPosition(position); startSmoothScroll(smoothScroller); } public void smoothScrollToPosition(RecyclerView recyclerView, int position) { RecyclerView.SmoothScroller smoothScroller = new CenterSmoothScroller(recyclerView.getContext()); smoothScroller.setTargetPosition(position); startSmoothScroll(smoothScroller); } private static class CenterSmoothScroller extends LinearSmoothScroller { CenterSmoothScroller(Context context) { super(context); } //滑动到中间位置 @Override public int calculateDtToFit(int viewStart, int viewEnd, int boxStart, int boxEnd, int snapPreference) { return (boxStart + (boxEnd - boxStart) / 2) - (viewStart + (viewEnd - viewStart) / 2); } //滚动速度设置 @Override protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) { return 4; } @Override protected int getVerticalSnapPreference() { return super.getVerticalSnapPreference(); } } }
滑动事件监听
public class CenterScrollListener extends RecyclerView.OnScrollListener { private CenterLayoutManager mLayoutManager; RecyclerView recyclerView; private int mPosition; private double intScrollState; private int mFirstItemPosition1; private int mLastItemPosition1; private boolean is_Stop; private String TAG = "CenterScrollListener"; private double is_playSound; public CenterScrollListener(OnItemCenterScrollistner onItemCenterScrollistner) { this.onItemCenterScrollistner = onItemCenterScrollistner; } public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) { init(recyclerView); intScrollState = newState; is_Stop = false; if (intScrollState == RecyclerView.SCROLL_STATE_IDLE) { Log.e(TAG, "onScrollStateChanged: 11111:"+mPosition); CeterScroll(0, mPosition); } } public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) { init(recyclerView); int x = Math.abs(dx); if (!is_Stop && x <= 1) { is_Stop = true; if (dx >= 0) { mPosition = (mFirstItemPosition1 + mLastItemPosition1) / 2; View childAt = mLayoutManager.findViewByPosition(mPosition); if (childAt.getLeft() < ScreenUtil.getScreenWidth(recyclerView.getContext()) / 2) { mPosition = mPosition + 1; } Log.e(TAG, "111111: w:" + childAt.getWidth() + " :l:" + childAt.getLeft() + " :r:" + childAt.getRight()); } else { mPosition = (mFirstItemPosition1 + mLastItemPosition1) / 2; View childAt = mLayoutManager.findViewByPosition(mPosition); if (childAt.getLeft() > ScreenUtil.getScreenWidth(recyclerView.getContext()) / 2) { mPosition = mPosition - 1; } } } CeterScroll(x, mPosition); } //事件监听 private void init(@NonNull RecyclerView recyclerView) { this.recyclerView = recyclerView; if (mLayoutManager == null) { mLayoutManager = (CenterLayoutManager) recyclerView.getLayoutManager(); } int firstItemPosition = mLayoutManager.findFirstVisibleItemPosition(); int lastItemPosition = mLayoutManager.findLastVisibleItemPosition(); mFirstItemPosition1 = mLayoutManager.findFirstCompletelyVisibleItemPosition(); mLastItemPosition1 = mLayoutManager.findLastCompletelyVisibleItemPosition(); mPosition = (mFirstItemPosition1 + mLastItemPosition1) / 2; if (is_playSound != mPosition) { is_playSound = mPosition; int count = mLayoutManager.getItemCount(); // soundpool.play(soundmap.get(1), 1, 1, 0, 0, 1); if (onItemCenterScrollistner != null) { //中间条目事件监听 onItemCenterScrollistner.onItemCenterScrollistner(mLastItemPosition1, mPosition,count); } } //目前由于要实现灰色条目当条目间距为10dp,屏幕宽度360时不能继续滑动 if (mPosition <= 18) { CeterScroll(0, 18); } } //速度变小时自动滚动到中间位置 private void CeterScroll(int dx, int position) { if ((intScrollState == RecyclerView.SCROLL_STATE_SETTLING || intScrollState == RecyclerView.SCROLL_STATE_IDLE) && Math.abs(dx) <= 1) { mLayoutManager.smoothScrollToPosition(recyclerView, position); } } OnItemCenterScrollistner onItemCenterScrollistner; public void setOnItemCenterScrollistner(OnItemCenterScrollistner onItemCenterScrollistner) { this.onItemCenterScrollistner = onItemCenterScrollistner; } public interface OnItemCenterScrollistner { void onItemCenterScrollistner(int lastItemPosition1, int position, int count); }
adpater实现
public class DateAdapter extends BaseRecyclerAdapter<CalendarDateBean> { private static final int layoutId = R.layout.view_item_date; public DateAdapter(Context context, List<CalendarDateBean> datas) { super(context, datas, layoutId); } @Override protected void bindData(BaseViewHolder holder, CalendarDateBean data, int position) { if (data.getDay() == 1) { //R.id.tv_1为线需要居中否则和中轴线不会完全对称 R.id.tv_2为大刻度文字 holder.getView(R.id.tv_1).setScaleX(2F); holder.setText(R.id.tv_2, data.getMonth() + "月"); holder.getView(R.id.tv_2).setVisibility(View.VISIBLE); holder.getView(R.id.tv_1).setBackgroundColor(Color.parseColor("#ffffff")); } else if (data.getDay() ==-1){ holder.getView(R.id.tv_1).setScaleX(1F); holder.getView(R.id.tv_2).setVisibility(View.GONE); holder.getView(R.id.tv_1).setBackgroundColor(Color.parseColor("#222222")); }else { holder.getView(R.id.tv_1).setScaleX(1F); holder.getView(R.id.tv_2).setVisibility(View.GONE); holder.getView(R.id.tv_1).setBackgroundColor(Color.parseColor("#ffffff")); } } }
activity 加载view展示
private void initRecyclerView() { //此处试配时注意item10dp 宽度360 计算发放 360/10/2得到记得适配 for (int i = 0; i < 18; i++) { TimeBean timeBean = new TimeBean(); mList.add(timeBean); } for (int i = 0; i < 1440; i++) { int minute = i % 60; int hour = i / 60; if (CalendarUtil.getHourTime()==hour&&CalendarUtil.getMinuteTime()==minute){ mPostion = i; } TimeBean timeBean = new TimeBean(); timeBean.setHour(hour); timeBean.setMinute(minute); timeBean.setTimeDate(CalendarUtil.getHourToMinute(hour,minute)); mList.add(timeBean); } for (int i = 0; i < 18; i++) { TimeBean timeBean = new TimeBean(); // timeBean.setMinute(-1); mList.add(timeBean); } rv_data = findViewById(R.id.rv_data); mAdapter = new TimeAdapter(this, mList); rv_data.setAdapter(mAdapter); //设置字体 rv_data.setTypeface(Typeface.createFromAsset(getAssets(), "fonts/dincond_boldalternate.ttf")); CenterLayoutManager layoutManager = new CenterLayoutManager(this); layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); rv_data.setLayoutManager(layoutManager); rv_data.scrollToPosition(mPostion); rv_data.addOnScrollListener(new CenterScrollListener((lastItemPosition, position,count) -> { //更新文本和单位 rv_data.setText(mList.get(position).getTimeDate()); if (mList.get(position).getHour()>12){ rv_data.setTextUnit("PM"); }else { rv_data.setTextUnit("AM"); } })); }
实现了基本代码全部写了。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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