Android recyclerview实现纵向虚线时间轴的示例代码

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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