自定义控件之-----progressBar

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*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：

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);
		}
	}
}

<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>

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。

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。