Android开发 自制圆形带进度显示的进度条

Android默认的进度条,如果是圆型的,是不能显示进度的,只是在转圈圈,而基于官方的ProgressBar自定义,也只能换那个圈圈的图片而已,无法实现展示进度。下图是要实现的效果:
circleProgressbar
其实原理也很简单,定义一个类继承View,在onDraw方法里画圆即可.

CircleProgressBar:


package com.pocketdigi.curcleprogressbar.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

public class CircleProgressBar extends View {
	private int maxProgress = 100;
	private int progress = 30;
	private int progressStrokeWidth = 4;
	//画圆所在的距形区域
	RectF oval;
	Paint paint;
	public CircleProgressBar(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO 自动生成的构造函数存根
		oval = new RectF();
		paint = new Paint();
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO 自动生成的方法存根
		super.onDraw(canvas);
		int width = this.getWidth();
		int height = this.getHeight();
		
		if(width!=height)
		{
			int min=Math.min(width, height);
			width=min;
			height=min;
		}
		
		paint.setAntiAlias(true); // 设置画笔为抗锯齿
		paint.setColor(Color.WHITE); // 设置画笔颜色
		canvas.drawColor(Color.TRANSPARENT); // 白色背景
		paint.setStrokeWidth(progressStrokeWidth); //线宽
		paint.setStyle(Style.STROKE);

		oval.left = progressStrokeWidth / 2; // 左上角x
		oval.top = progressStrokeWidth / 2; // 左上角y
		oval.right = width - progressStrokeWidth / 2; // 左下角x
		oval.bottom = height - progressStrokeWidth / 2; // 右下角y

		canvas.drawArc(oval, -90, 360, false, paint); // 绘制白色圆圈,即进度条背景
		paint.setColor(Color.rgb(0x57, 0x87, 0xb6));
		canvas.drawArc(oval, -90, ((float) progress / maxProgress) * 360, false, paint); // 绘制进度圆弧,这里是蓝色
		
		paint.setStrokeWidth(1);
		String text = progress + "%";
		int textHeight = height / 4;
		paint.setTextSize(textHeight);
		int textWidth = (int) paint.measureText(text, 0, text.length());
		paint.setStyle(Style.FILL);
		canvas.drawText(text, width / 2 - textWidth / 2, height / 2 +textHeight/2, paint);

	}
	
	
	
	public int getMaxProgress() {
		return maxProgress;
	}

	public void setMaxProgress(int maxProgress) {
		this.maxProgress = maxProgress;
	}

	public void setProgress(int progress) {
		this.progress = progress;
		this.invalidate();
	}

	/**
	 * 非UI线程调用
	 */
	public void setProgressNotInUiThread(int progress) {
		this.progress = progress;
		this.postInvalidate();
	}
}

activity_main.xml:


<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:background="#ccc"
    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=".MainActivity" >


    <com.pocketdigi.curcleprogressbar.view.CircleProgressBar
        android:id="@+id/circleProgressbar"
        android:layout_width="60dp"
        android:layout_height="60dp" />

</RelativeLayout>

MainActivity.java:


package com.pocketdigi.circleprogressbar;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

import com.pocketdigi.curcleprogressbar.view.CircleProgressBar;

public class MainActivity extends Activity {

	CircleProgressBar progressBar;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		progressBar=(CircleProgressBar)findViewById(R.id.circleProgressbar);
		new Thread()
		{
			public void run()
			{
				int i=0;
				while(i<=100)
				{
					progressBar.setProgressNotInUiThread(i);
					i++;
					try {
						sleep(100);
					} catch (InterruptedException e) {
						// TODO 自动生成的 catch 块
						e.printStackTrace();
					}
				}
			
			}
		}.start();
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

虽然代码很简单,还是照顾一下新人,上源码包:
[download id="41" format="1"]

© 2013, 冰冻鱼. 请尊重作者劳动成果,复制转载保留本站链接! 应用开发笔记

发表评论

电子邮件地址不会被公开。 必填项已用*标注