import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by yanchengmengon 2017/3/22.
 */


public class DashLineView extends View {

    private float y=500;
    private int lineColor=android.R.color.darker_gray;

    public DashLineView(Context context, AttributeSet attrs) {
        super(context, attrs);

    }

    public DashLineView(Context context) {
        super(context);
    }

    public DashLineView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public DashLineView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint = new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(getResources().getColor(lineColor));//顏色可以自己設定
        Path path = new Path();
        path.moveTo(0, 0);//起始座標
        path.lineTo(0, y);//終點座標
        PathEffect effects = new DashPathEffect(new float[]{8, 8, 8, 8}, 1);//設定虛線的間隔和點的長度
        paint.setPathEffect(effects);
        canvas.drawPath(path, paint);
    }

    /**
     * 設定虛線終點y座標：也就是虛線長度
     * @param y
     */
    @Override
    public void setY(float y) {
        this.y = y;
        invalidate();
    }

    /**
     * 設定虛線顏色
     * @param lineColor
     */
    public void setLineColor(int lineColor) {
        this.lineColor = lineColor;
        invalidate();
    }
}