Android 圆弧形进度条 自定义View

前段时间一个项目需要做类似360扫描 圆弧形进度条

闲言碎语不要将--%26gt;

1.首先重写View 在XML layout中应用，我们需要在Value 文件夹下新建attrs.xml

在attrs.xml 里定义我们所需要的属性，然后就可以像Android自带的各种控件一

样在布局文件中一一引用。

attrs.xml

%26lt;?xml version="1.0" encoding="utf-8"?%26gt;
%26lt;resources%26gt;

%26lt;declare-styleable name="CircleProgressBar"%26gt;
%26lt;attr name="circleColor" format="color"/%26gt;
%26lt;attr name="circleProgressColor" format="color"/%26gt;
%26lt;attr name="circleWidth" format="dimension"%26gt;%26lt;/attr%26gt;
%26lt;attr name="textColor" format="color" /%26gt;
%26lt;attr name="textSize" format="dimension" /%26gt;
%26lt;attr name="max" format="integer"%26gt;%26lt;/attr%26gt;
%26lt;attr name="textIsDisplayable" format="boolean"%26gt;%26lt;/attr%26gt;
%26lt;attr name="style"%26gt;
%26lt;enum name="STROKE" value="0"%26gt;%26lt;/enum%26gt;
%26lt;enum name="FILL" value="1"%26gt;%26lt;/enum%26gt;
%26lt;/attr%26gt;
%26lt;/declare-styleable%26gt;

%26lt;/resources%26gt;

2.接着新建一个类CircleProgressBar extends View

我们需要在CircleProgressBar 的构造方法中获取 自己定义的属性。

TypedArray mTypedArray = context.obtainStyledAttributes(attrs,

R.styleable.CircleProgressBar);

先获取到TypedArray ,然后在通过TypedArray 获取到定义的各个属性。

circleColor = mTypedArray.getColor(R.styleable.CircleProgressBar_circleColor, 0xff47d8af);

mTypedArray.getColor() ,方法里的第一个参数是我们在attrs.xml 中定义的值，第二个参数是默认获取不到时的默认值（即我们没在布局文件中设置CircleProgressBar 的Color属性）

TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.CircleProgressBar);

//获取自定义属性和默认值
circleColor = mTypedArray.getColor(R.styleable.CircleProgressBar_circleColor, 0xff47d8af);
circleProgressColor = mTypedArray.getColor(R.styleable.CircleProgressBar_circleProgressColor, Color.WHITE);
textColor = mTypedArray.getColor(R.styleable.CircleProgressBar_textColor, Color.WHITE);
textSize = mTypedArray.getDimension(R.styleable.CircleProgressBar_textSize, 40);
roundWidth = mTypedArray.getDimension(R.styleable.CircleProgressBar_circleWidth, 3);
max = mTypedArray.getInteger(R.styleable.CircleProgressBar_max, 100);
textIsDisplayable = mTypedArray.getBoolean(R.styleable.CircleProgressBar_textIsDisplayable, true);
style = mTypedArray.getInt(R.styleable.CircleProgressBar_style, 0);

mTypedArray.recycle();

%26nbsp;

3.下面是CircleProgressBar 的全部代码

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;

public class CircleProgressBar extends View {

private Paint paint;
private int circleColor;
private int circleProgressCo
4000
lor;
private int textColor;
private float textSize;
private float roundWidth;
private int max;
private int progress;
private boolean textIsDisplayable;
private int style;
public static final int STROKE = 0;
public static final int FILL = 1;

public CircleProgressBar(Context context) {
this(context, null);
}

public CircleProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}

public CircleProgressBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);

paint = new Paint();
TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.CircleProgressBar);

//获取自定义属性和默认值
circleColor = mTypedArray.getColor(R.styleable.CircleProgressBar_circleColor, 0xff47d8af);
circleProgressColor = mTypedArray.getColor(R.styleable.CircleProgressBar_circleProgressColor, Color.WHITE);
textColor = mTypedArray.getColor(R.styleable.CircleProgressBar_textColor, Color.WHITE);
textSize = mTypedArray.getDimension(R.styleable.CircleProgressBar_textSize, 40);
roundWidth = mTypedArray.getDimension(R.styleable.CircleProgressBar_circleWidth, 3);
max = mTypedArray.getInteger(R.styleable.CircleProgressBar_max, 100);
textIsDisplayable = mTypedArray.getBoolean(R.styleable.CircleProgressBar_textIsDisplayable, true);
style = mTypedArray.getInt(R.styleable.CircleProgressBar_style, 0);

mTypedArray.recycle();
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

/**
* 画最外层的大圆环
*/
int centre = getWidth()/2; //获取圆心的x坐标
int radius = (int) (centre - roundWidth/2); //圆环的半径
paint.setColor(circleColor); //设置圆环的颜色
paint.setStyle(Paint.Style.STROKE); //设置空心
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setAntiAlias(true);  //消除锯齿
canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));
canvas.drawCircle(centre, centre, radius, paint); //画出圆环

/**
* 画进度百分比
*/
paint.setStrokeWidth(0);
paint.setColor(textColor);
paint.setTextSize(textSize);
paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体

int percent = (int)(((float)progress / (float)max) * 100);  //中间的进度百分比，先转换成float在进行除法运算，不然都为0
float textWidth = paint.measureText(percent + "%");   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间

if(textIsDisplayable %26amp;%26amp; percent != 0 %26amp;%26amp; style == STROKE){
canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比
}

/**
* 画圆弧 ，画圆环的进度
*/

//设置进度是实心还是空心
radius = (int) (centre - roundWidth*2);
paint.setStrokeWidth(roundWidth*2); //设置圆环的宽度
paint.setColor(circleProgressColor);  //设置进度的颜色
RectF oval = new RectF(centre - radius, centre - radius, centre
+ radius, centre + radius);  //用于定义的圆弧的形状和大小的界限

switch (style) {
case STROKE:{
paint.setStyle(Paint.Style.STROKE);
canvas.drawArc(oval, 0, 360 * progress / max, false, paint);  //根据进度画圆弧
break;
}
case FILL:{
paint.setStyle(Paint.Style.FILL_AND_STROKE);
if(progress !=0)
canvas.drawArc(oval, 0, 360 * progress / max, true, paint);  //根据进度画圆弧
break;
}
}

}

public synchronized int getMax() {
return max;
}

/**
* 设置进度的最大值
* @param max
*/
public synchronized void setMax(int max) {
if(max %26lt; 0){
throw new IllegalArgumentException("max not less than 0");
}
this.max = max;
}

/**
* 获取进度.需要同步
* @return
*/
public synchronized int getProgress() {
return progress;
}

/**
* 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
* 刷新界面调用postInvalidate()能在非UI线程刷新
* @param progress
*/
public synchronized void setProgress(int progress) {
if(progress %26lt; 0){
throw new IllegalArgumentException("progress not less than 0");
}
if(progress %26gt; max){
progress = max;
}
if(progress %26lt;= max){
this.progress = progress;
postInvalidate();
}

}

public int getCricleColor() {
return circleColor;
}

public void setCricleColor(int cricleColor) {
this.circleColor = cricleColor;
}

public int getCricleProgressColor() {
return circleProgressColor;
}

public void setCricleProgressColor(int cricleProgressColor) {
this.circleProgressColor = cricleProgressColor;
}

public int getTextColor() {
return textColor;
}

public void setTextColor(int textColor) {
this.textColor = textColor;
}

public float getTextSize() {
return textSize;
}

public void setTextSize(float textSize) {
this.textSize = textSize;
}

public float getRoundWidth() {
return roundWidth;
}

public void setRoundWidth(float roundWidth) {
this.roundWidth = roundWidth;
}

}

%26nbsp;

4.最后说一下在布局文件中的使用

需要在.xml 布局文件的最外面一层加上

xmlns:android_custom="http://schemas.android.com/apk/res/com.example.circleprogress"这个即命名空间

注意：上面绿色字体部分随意写，橙色字体是工程的包名，别写错哦！

%26nbsp;

%26lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:android_custom="http://schemas.android.com/apk/res/com.example.circleprogress"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" %26gt;

%26lt;com.examp
9f41
le.circleprogress.CircleProgressBar
android:id="@+id/circleProgresBar"
android:layout_width="80dip"
android:layout_height="80dip"

android_custom:circleColor="#47d8af"
android_custom:circleProgressColor="@android:color/white"
android_custom:textColor="@android:color/white"
android_custom:textIsDisplayable="true"
android_custom:roundWidth="2dp"
android_custom:textSize="40sp"/%26gt;
%26lt;/RelativeLayout%26gt;

%26nbsp;

5.付效果图一张



%26nbsp;