android开发之自定义圆形进度条(RoundProgressBar)

各位观众，如果你想要实现上面20%的图形进度条，您将怎么办？
我会告诉大家，跟随我的脚步，我会让大家看到奇迹！

首先，自定义View：

/**
 * 仿iphone带进度的进度条，线程安全的View，可直接在线程中更新进度
 * @author wangxiao
 *
 */
public class RoundProgressBar extends View {
    /**
     * 画笔对象的引用
     */
    private Paint paint;

    /**
     * 圆环的颜色
     */
    private int roundColor;

    /**
     * 圆环进度的颜色
     */
    private int roundProgressColor;

    /**
     * 中间进度百分比的字符串的颜色
     */
    private int textColor;

    /**
     * 中间进度百分比的字符串的字体
     */
    private float textSize;

    /**
     * 圆环的宽度
     */
    private float roundWidth;

    /**
     * 最大进度
     */
    private int max;

    /**
     * 当前进度
     */
    private int progress;
    /**
     * 是否显示中间的进度
     */
    private boolean textIsDisplayable;

    /**
     * 进度的风格，实心或者空心
     */
    private int style;

    public static final int STROKE = 0;
    public static final int FILL = 1;

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

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

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

        paint = new Paint();


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

        //获取自定义属性和默认值
        roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
        roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
        textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
        textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
        roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
        max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
        textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
        style = mTypedArray.getInt(R.styleable.RoundProgressBar_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)-2; //圆环的半径
        paint.setColor(roundColor); //设置圆环的颜色
        paint.setStyle(Paint.Style.STROKE); //设置空心
        paint.setStrokeWidth(roundWidth-2); //设置圆环的宽度
        paint.setAntiAlias(true);  //消除锯齿 
        canvas.drawCircle(centre, centre, radius, paint); //画出圆环

        Log.e("log", centre + "");

        /**
         * 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  && 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
        paint.setStrokeWidth(roundWidth); //设置圆环的宽度
        paint.setColor(roundProgressColor);  //设置进度的颜色
        RectF oval = new RectF(centre - radius-1, centre - radius-1, centre
                + radius+1, centre + radius+1);  //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, 90, 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, 90, 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 < 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 < 0){
            throw new IllegalArgumentException("progress not less than 0");
        }
        if(progress > max){
            progress = max;
        }
        if(progress <= max){
            this.progress = progress;
            postInvalidate();
        }

    }


    public int getCricleColor() {
        return roundColor;
    }

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

    public int getCricleProgressColor() {
        return roundProgressColor;
    }

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

我想，我不需要做太多的解释了，因为在代码中我将我所知道的，想要告诉大家的都变成了注释！！

接下来，就是对上面的代码中，引用了其他的资源进行展示：
1、自定义属性：/res/values/attrs.xml文件下：

<declare-styleable name="RoundProgressBar">
    <attr name="roundColor" format="color"/>
    <attr name="roundProgressColor" format="color"/>
    <attr name="roundWidth" format="dimension">attr>
    <attr name="textColor" format="color" />
    <attr name="textSize" format="dimension" />
    <attr name="max" format="integer">attr>
    <attr name="textIsDisplayable" format="boolean">attr>
    <attr name="style">
        <enum name="STROKE" value="0">enum>
        <enum name="FILL" value="1">enum>
    attr>
declare-styleable>

最后，引用自定义View：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:android_custom="http://schemas.android.com/apk/res-auto" //引用自定义属性
              android:layout_width="match_parent"
              android:layout_height="@dimen/s_90dp"
              android:background="@drawable/select_item_selector"
        >
    <com.offcn.android.wangxiao.view.RoundProgressBar
            android:id="@+id/roundProgressBar"
            android:layout_width="@dimen/s_40dp"
            android:layout_height="@dimen/s_40dp"
            android:layout_centerVertical="true"
            android:layout_marginLeft="@dimen/s_10dp"

            android_custom:roundColor="#D1D1D1"
            android_custom:roundProgressColor="@color/color_blue"
            android_custom:textColor="@color/color_blue"
            android_custom:roundWidth="@dimen/s_2dp"
            android_custom:textSize="@dimen/s_13dp"
            android_custom:max="10"
            />
RelativeLayout>