android开发步步为营之94:使用PathEffect画虚线和虚线框

package com.figo.study.activity;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import com.figo.study.R;

public class PathEffectActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new PathEffectView(this));

}

public class PathEffectView extends View {
public PathEffectView(Context context) {
super(context);
}

public PathEffectView(Context context, AttributeSet attrs) {
super(context, attrs);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//绘制背景
canvas.drawColor(Color.WHITE);
//创建画笔
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(2);
//创建路径效果
PathEffect pathEffect = new DashPathEffect(new float[]{10f, 2f}, 0);
paint.setPathEffect(pathEffect);
//创建路径
Path path = new Path();
path.moveTo(0, 200);//起点
path.lineTo(200, 0);//画一条线

canvas.drawPath(path, paint);
path.reset();
//绘制一个矩形框
path.moveTo(200, 200);
path.lineTo(400, 200);
path.lineTo(400, 400);
path.lineTo(200, 400);
path.lineTo(200, 200);
paint.setPathEffect(pathEffect);
canvas.drawPath(path, paint);

}
}
}