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();

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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 circleProgressColor;    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;    }}

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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！

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%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.example.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; 

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5.付效果图一张

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