android canvas 编辑bitmap画虚线

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效果图

布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.testsss.PaintActivity"     android:orientation="vertical">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <Button         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="画线"        android:onClick="paint"/>    <ImageView         android:id="@+id/iv"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:src="@drawable/ic_launcher"        /></LinearLayout>

activity

package com.example.testsss;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.DashPathEffect;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.PathEffect;import android.os.Bundle;import android.view.View;import android.widget.ImageView;public class PaintActivity extends Activity {    private ImageView iv;    private Bitmap bitmap;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_paint);iv = (ImageView) findViewById(R.id.iv);bitmap = Bitmap.createBitmap(getResources().getDisplayMetrics().widthPixels,getResources().getDisplayMetrics().heightPixels-iv.getTop(), Config.ARGB_8888);}public void paint(View v){test();}private void test() {Canvas canvas = new Canvas(bitmap);Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);p.setStyle(Style.STROKE);p.setColor(Color.BLUE);p.setStrokeWidth(5);PathEffect effects = new DashPathEffect(new float[] { 1, 2, 4, 8}, 1);p.setPathEffect(effects);canvas.drawCircle(getResources().getDisplayMetrics().widthPixels/2,getResources().getDisplayMetrics().widthPixels/2,getResources().getDisplayMetrics().widthPixels/3, p);canvas.drawLine(0, 0, getResources().getDisplayMetrics().widthPixels,getResources().getDisplayMetrics().widthPixels, p);iv.setImageBitmap(bitmap);} }

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