怎么用Android recyclerview实现纵向虚线时间轴

本篇内容主要讲解"怎么用Android recyclerview实现纵向虚线时间轴"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"怎么用Android recyclerview实现纵向虚线时间轴"吧!

效果图

代码

package com.jh.timelinedemo; import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.DashPathEffect;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;  /** * @Description: Android自定义虚线 * @Date 2019-07-20 10:07 * @Version */public class DividerView extends View {    static public int ORIENTATION_HORIZONTAL = 0;    static public int ORIENTATION_VERTICAL = 1;    private Paint mPaint;    private int orientation;     public DividerView(Context context) {        this(context, null);    }     public DividerView(Context context, AttributeSet attrs) {        super(context, attrs);        int dashGap, dashLength, dashThickness;        int color;         TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.DividerView, 0, 0);         try {            dashGap = a.getDimensionPixelSize(R.styleable.DividerView_dashGap, 5);            dashLength = a.getDimensionPixelSize(R.styleable.DividerView_dashLength, 5);            dashThickness = a.getDimensionPixelSize(R.styleable.DividerView_dashThickness, 3);            color = a.getColor(R.styleable.DividerView_divider_line_color, 0xff000000);            orientation = a.getInt(R.styleable.DividerView_divider_orientation, ORIENTATION_HORIZONTAL);        } finally {            a.recycle();        }         mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setColor(color);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(dashThickness);        mPaint.setPathEffect(new DashPathEffect(new float[]{dashGap, dashLength,}, 0));    }     public void setBgColor(int color) {        mPaint.setColor(color);        invalidate();    }     @Override    protected void onDraw(Canvas canvas) {        if (orientation == ORIENTATION_HORIZONTAL) {            float center = getHeight() * 0.5f;            canvas.drawLine(0, center, getWidth(), center, mPaint);        } else {            float center = getWidth() * 0.5f;            canvas.drawLine(center, 0, center, getHeight(), mPaint);        }    }}

package com.jh.timelinedemo; import androidx.appcompat.app.AppCompatActivity;import androidx.recyclerview.widget.LinearLayoutManager;import androidx.recyclerview.widget.RecyclerView; import android.os.Bundle;import android.view.View; public class MainActivity extends AppCompatActivity {     private RecyclerView rcy;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        rcy = findViewById(R.id.rcy);         LinearLayoutManager manager = new LinearLayoutManager(this, RecyclerView.VERTICAL, false);        rcy.setLayoutManager(manager);        TimeLineAdapter adapter = new TimeLineAdapter(this);        rcy.setAdapter(adapter);    }}

package com.jh.timelinedemo; import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup; import androidx.annotation.NonNull;import androidx.recyclerview.widget.RecyclerView; /** *  * @date：on 2021/7/21 17:38 */public class TimeLineAdapter extends RecyclerView.Adapter {     private Context context;     public TimeLineAdapter(Context context) {        this.context = context;    }     @NonNull    @Override    public TimeLineAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, null);        ViewHolder viewHolder = new ViewHolder(inflate);        return viewHolder;    }     @Override    public void onBindViewHolder(@NonNull TimeLineAdapter.ViewHolder holder, int position) {        holder.line_up.setVisibility(position == 0 ? View.INVISIBLE : View.VISIBLE);//第一条数据隐藏头部线        holder.line_down.setVisibility(position == 4 ? View.INVISIBLE : View.VISIBLE);//最后一条数据隐藏底部线    }     @Override    public int getItemCount() {        return 5;    }     class ViewHolder extends RecyclerView.ViewHolder {         private final DividerView line_up, line_down;         public ViewHolder(@NonNull View itemView) {            super(itemView);            line_up = itemView.findViewById(R.id.line_up);            line_down = itemView.findViewById(R.id.line_down);        }    }}

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