相信你看完2會吐槽，臥槽，這麼坑爹，拿個動畫來坑人，哈哈，實際開發中都這樣，當然上述這種情況只適用於不用顯示進度的場合，如果要顯示進度的場合就沒用處了，好吧，接下來看下網上一個簡單的自定義圓形進度條！程式碼還是比較簡單，容易理解，又興趣可以看看，或者進行相關擴充套件~

執行效果圖：

實現程式碼：

自定義View類：

/**
 * Created by Jay on 2015/8/5 0005.
 */publicclassCirclePgBarextendsView{privatePaint mBackPaint;privatePaint mFrontPaint;privatePaint mTextPaint
 
;privatefloat mStrokeWidth =50;privatefloat mHalfStrokeWidth = mStrokeWidth /2;privatefloat mRadius =200;privateRectF mRect;privateint mProgress =0;//目標值，想改多少就改多少privateint mTargetProgress =90;privateint mMax =100;privateint mWidth;privateint mHeight;publicCirclePgBar(Context context){super(context);
        init
 
();}publicCirclePgBar(Context context,AttributeSet attrs){super(context, attrs);
        init();}publicCirclePgBar(Context context,AttributeSet attrs,int defStyleAttr){super(context, attrs, defStyleAttr);
        init();}//完成相關引數初始化privatevoid init(){
        mBackPaint =newPaint();
        mBackPaint
 
.setColor(Color.WHITE);
        mBackPaint.setAntiAlias(true);
        mBackPaint.setStyle(Paint.Style.STROKE);
        mBackPaint.setStrokeWidth(mStrokeWidth);

        mFrontPaint =newPaint();
        mFrontPaint.setColor(Color.GREEN);
        mFrontPaint.setAntiAlias(true);
        mFrontPaint.setStyle(Paint.Style.STROKE);
        mFrontPaint.setStrokeWidth(mStrokeWidth);


        mTextPaint =newPaint();
        mTextPaint.setColor(Color.GREEN);
        mTextPaint.setAntiAlias(true);
        mTextPaint.setTextSize(80);
        mTextPaint.setTextAlign(Paint.Align.CENTER);}//重寫測量大小的onMeasure方法和繪製View的核心方法onDraw()@Overrideprotectedvoid onMeasure(int widthMeasureSpec,int heightMeasureSpec){super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mWidth = getRealSize(widthMeasureSpec);
        mHeight = getRealSize(heightMeasureSpec);
        setMeasuredDimension(mWidth, mHeight);}@Overrideprotectedvoid onDraw(Canvas canvas){
        initRect();float angle = mProgress /(float) mMax *360;
        canvas.drawCircle(mWidth /2, mHeight /2, mRadius, mBackPaint);
        canvas.drawArc(mRect,-90, angle,false, mFrontPaint);
        canvas.drawText(mProgress +"%", mWidth /2+ mHalfStrokeWidth, mHeight /2+ mHalfStrokeWidth, mTextPaint);if(mProgress < mTargetProgress){
            mProgress +=1;
            invalidate();}}publicint getRealSize(int measureSpec){int result =1;int mode =MeasureSpec.getMode(measureSpec);int size =MeasureSpec.getSize(measureSpec);if(mode ==MeasureSpec.AT_MOST || mode ==MeasureSpec.UNSPECIFIED){//自己計算
            result =(int)(mRadius *2+ mStrokeWidth);}else{
            result = size;}return result;}privatevoid initRect(){if(mRect ==null){
            mRect =newRectF();int viewSize =(int)(mRadius *2);int left =(mWidth - viewSize)/2;int top =(mHeight - viewSize)/2;int right = left + viewSize;int bottom = top + viewSize;
            mRect.set(left, top, right, bottom);}}}

然後在佈局檔案中加上：

<com.jay.progressbardemo.CirclePgBarandroid:layout_width="match_parent"android:layout_height="match_parent"/>

就是這麼簡單~