写了那一年多代码都没有认认真真写过自定义控件,最近看到网易新闻里面的加载图标如图
感觉很有意思,就准备自己写个玩玩。在api里面脑补了一些canvas的姿势,就上了,效果如下。
说实话真心不难,自定义控件比起平时做的应用多了几分自由和创作的快感,可能我应该去做游戏,代码如下,注释已经写的很白痴了:
[java] view plaincopyprint?
- package com.example.circleprogressbar;
- import android.content.Context;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.graphics.RectF;
- import android.util.AttributeSet;
- import android.view.View;
- public class CircleProgressBarView extends View {
- private int progress;
- private int max;
- private Paint paint;
- private RectF oval;
- public int getMax() {
- return max;
- }
- public void setMax(int max) {
- this.max = max;
- }
- public int getProgress() {
- return progress;
- }
- public void setProgress(int progress) {
- this.progress = progress;
- invalidate();
- }
- public CircleProgressBarView(Context context, AttributeSet attrs) {
- super(context, attrs);
- paint = new Paint();
- oval = new RectF();
- }
- @Override
- protected void onDraw(Canvas canvas) {
- super.onDraw(canvas);
- paint.setAntiAlias(true);// 设置是否抗锯齿
- paint.setFlags(Paint.ANTI_ALIAS_FLAG);// 帮助消除锯齿
- paint.setColor(Color.GRAY);// 设置画笔灰色
- paint.setStrokeWidth(10);// 设置画笔宽度
- paint.setStyle(Paint.Style.STROKE);// 设置中空的样式
- canvas.drawCircle(100, 100, 55, paint);// 在中心为(100,100)的地方画个半径为55的圆,宽度为setStrokeWidth:10,也就是灰色的底边
- paint.setColor(Color.GREEN);// 设置画笔为绿色
- oval.set(45, 45, 155, 155);// 设置类似于左上角坐标(45,45),右下角坐标(155,155),这样也就保证了半径为55
- canvas.drawArc(oval, -90, ((float) progress / max) * 360, false, paint);// 画圆弧,第二个参数为:起始角度,第三个为跨的角度,第四个为true的时候是实心,false的时候为空心
- paint.reset();// 将画笔重置
- paint.setStrokeWidth(3);// 再次设置画笔的宽度
- paint.setTextSize(35);// 设置文字的大小
- paint.setColor(Color.BLACK);// 设置画笔颜色
- if (progress == max) {
- canvas.drawText("完成", 70, 110, paint);
- } else {
- canvas.drawText(progress + "%", 70, 110, paint);
- }
- }
- }
[html] view plaincopyprint?
- <RelativeLayout 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=".CirclePbActivity" >
- <com.example.circleprogressbar.CircleProgressBarView
- android:id="@+id/circleProgressBar"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content" />
- </RelativeLayout>
[java] view plaincopyprint?
- package com.example.circleprogressbar;
- import android.os.Bundle;
- import android.os.Handler;
- import android.app.Activity;
- import android.view.Menu;
- public class CirclePbActivity extends Activity {
- private CircleProgressBarView testConvas;
- private int i = 0;
- Handler handler = new Handler() {
- public void handleMessage(android.os.Message msg) {
- testConvas.setProgress(msg.what);
- if (i <= testConvas.getMax()) {
- handler.sendEmptyMessageDelayed(i++, 50);
- }
- };
- };
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_circle_progressbar);
- testConvas = (CircleProgressBarView) findViewById(R.id.circleProgressBar);
- testConvas.setMax(100);
- handler.sendEmptyMessageDelayed(i++, 50);
- }
- }
做了圆形的,一不做二不休,把horizontalProgressBar也做了一遍,加了一点创意要素,立马多了几分艺术气息(其实好像更俗气了),各位可以自己发挥想象力。
[java] view plaincopyprint?
- package com.example.circleprogressbar;
- import android.annotation.SuppressLint;
- import android.content.Context;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.util.AttributeSet;
- import android.view.View;
- @SuppressLint("DrawAllocation")
- public class HorizontalProgressBarView extends View {
- private int progress = 50;
- private int max = 100;
- private int mwidth = 450;
- private int mhight = 40;
- private int startX;
- private int startY;
- private Paint paint;
- public int getMwidth() {
- return mwidth;
- }
- public void setMwidth(int mwidth) {
- this.mwidth = mwidth;
- }
- public int getMhight() {
- return mhight;
- }
- public void setMhight(int mhight) {
- this.mhight = mhight;
- }
- public int getProgress() {
- return progress;
- }
- public void setProgress(int progress) {
- this.progress = progress;
- invalidate();
- }
- public int getMax() {
- return max;
- }
- public void setMax(int max) {
- this.max = max;
- }
- public HorizontalProgressBarView(Context context, AttributeSet attrs) {
- super(context, attrs);
- paint = new Paint();
- }
- @Override
- protected void onDraw(Canvas canvas) {
- super.onDraw(canvas);
- paint.setAntiAlias(true);// 设置是否抗锯齿
- paint.setFlags(Paint.ANTI_ALIAS_FLAG);// 帮助消除锯齿
- paint.setColor(Color.parseColor("#EFEFEF"));// 设置画笔灰色
- paint.setStrokeWidth(10);// 设置画笔宽度
- canvas.drawRect(startX, startY, mwidth, mhight, paint);
- paint.setColor(Color.parseColor("#76B034"));
- canvas.drawRect(startX, startY, ((float) progress / max) * mwidth,
- mhight, paint);
- // 绘制内部线条
- paint.setStrokeWidth(2);
- paint.setColor(Color.YELLOW);
- canvas.drawLine(startX, startY + (mhight - startY) / 4 * 1,
- ((float) progress / max) * mwidth, startY + (mhight - startY)
- / 4 * 1, paint);
- paint.setColor(Color.RED);
- canvas.drawLine(startX, startY + (mhight - startY) / 4 * 2,
- ((float) progress / max) * mwidth, startY + (mhight - startY)
- / 4 * 2, paint);
- paint.setColor(Color.WHITE);
- canvas.drawLine(startX, startY + (mhight - startY) / 4 * 3,
- ((float) progress / max) * mwidth, startY + (mhight - startY)
- / 4 * 3, paint);
- // 绘制下标进度数字
- if(progress<(max/3)){
- paint.setColor(Color.BLACK);
- }else if(progress<(max/3)*2&&progress>(max/3)){
- paint.setColor(Color.YELLOW);
- }else{
- paint.setColor(Color.RED);
- }
- paint.setTextSize(30);
- canvas.drawText(progress + "%", ((float) progress / max) * mwidth - 20,
- mhight + 30, paint);
- }
- }
最后谈一下感想:
总感觉学的越多,自己的想象力和创新能力越枯竭,代码敲多了,脑袋敲不灵活了,以前没接触程序的时候有很多的想法,现在感觉自己越来越平庸,没了那份想象力,和搬砖的有什么区别?天朝的教育让能很快学会人家的技术,但是永远跟着别人后面,就看各大布局,各种控件,基本上都是学国外的。哎,不吐槽了,已经这样了,我希望能保存自己仅有的那份想象力,在敲代码的时候多想想自己能创造什么,一次从无到有,比重复千万次人家的都有价值,我是这么认为的。
原文:http://blog.csdn.net/mobilexu/article/details/9666461
时间: 2024-10-07 20:54:35