效果图:
这个是看了梁肖的demo,根据他的思路自己写了一个,但是我写的这个貌似计算还是有些问题,这个过程还是有点曲折的,不过还是觉得收获挺多的。比如通动画来进行动态的展示(之前做的都是通过Handler进行更新的所以现在换一种思路觉得特别好),还有圆弧的起止角度,矩形区域的计算等!关于绘制我们可以循序渐进,比如最开始先画圆,然后再画周围的线,最后设置动画部分就可以了。不多说了,上代码了。
代码
自定义View
public class ColorProgressBar extends View{ private int mWidth; private int mHeight; private Paint mPaintbg; private Paint mPaintft; private Paint mPaintLine; private int mLongItem=dip2px(20); private int mDistanceItem=dip2px(10); private int mProgressWidth; private int mBackColor; private int mFrontColor; private float mBackWidth; private float mFrontWidth; private float currentvalue; private ValueAnimator animator; private int curvalue; public ColorProgressBar(Context context) { this(context,null,0); } public ColorProgressBar(Context context, AttributeSet attrs) { this(context, attrs,0); } public ColorProgressBar(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray ta=context.obtainStyledAttributes(attrs, R.styleable.ColorProgressBar); mBackColor= ta.getColor(R.styleable.ColorProgressBar_back_color, Color.BLACK); mFrontColor=ta.getColor(R.styleable.ColorProgressBar_front_color,mBackColor); mBackWidth=ta.getDimension(R.styleable.ColorProgressBar_back_width,dip2px(10)); mFrontWidth=ta.getDimension(R.styleable.ColorProgressBar_front_width,dip2px(10)); mProgressWidth=mBackWidth>mFrontWidth?(int)mBackWidth:(int)mFrontWidth; ta.recycle(); init(); } /** * 都是画笔初始化 */ private void init() { mPaintbg=new Paint(Paint.ANTI_ALIAS_FLAG); mPaintbg.setStrokeWidth(mProgressWidth); mPaintbg.setColor(mBackColor); mPaintbg.setStrokeCap(Paint.Cap.ROUND); mPaintbg.setStyle(Paint.Style.STROKE); mPaintft=new Paint(Paint.ANTI_ALIAS_FLAG); mPaintft.setColor(mFrontColor); mPaintft.setStyle(Paint.Style.STROKE); mPaintft.setStrokeWidth(mFrontWidth); mPaintft.setStrokeCap(Paint.Cap.ROUND); mPaintLine=new Paint(Paint.ANTI_ALIAS_FLAG); mPaintLine.setColor(Color.BLACK); mPaintLine.setStrokeWidth(5); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mWidth=mHeight=getScreenWidth()*2/3; setMeasuredDimension(mWidth,mHeight); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawArc(new RectF(mProgressWidth+mDistanceItem+mLongItem,mProgressWidth+mDistanceItem+mLongItem,mWidth-mProgressWidth-mDistanceItem-mLongItem,mHeight-mProgressWidth-mDistanceItem-mLongItem),0,360,true,mPaintbg); canvas.save(); canvas.rotate(144,mWidth/2,mHeight/2); for(int i=0;i<=30;i++){ canvas.rotate(-9,mWidth/2,mHeight/2); if(i%5==0){ canvas.drawLine(mWidth/2,10,mWidth/2,mLongItem,mPaintbg); }else { canvas.drawLine(mWidth/2,25,mWidth/2,mLongItem,mPaintLine); } } canvas.restore(); SweepGradient sweepGradient=new SweepGradient(mWidth/2,mHeight/2,Color.RED,Color.YELLOW); mPaintft.setShader(sweepGradient); canvas.drawArc(new RectF(mProgressWidth+mDistanceItem+mLongItem,mProgressWidth+mDistanceItem+mLongItem,mWidth-mProgressWidth-mDistanceItem-mLongItem,mHeight-mProgressWidth-mDistanceItem-mLongItem),135,currentvalue,false,mPaintft); mPaintft.setTextSize(100); mPaintft.setTextAlign(Paint.Align.CENTER); canvas.drawText(String.format("%.0f",currentvalue),mWidth/2,mHeight/2+50,mPaintft); } /** * 设置动画 * @param value */ public void setCurrentValue(float value){ animator=ValueAnimator.ofFloat(currentvalue,value); animator.setDuration(3000); animator.setTarget(currentvalue); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { currentvalue= (float) valueAnimator.getAnimatedValue(); curvalue=curvalue/10; invalidate(); } }); animator.start(); } private int dip2px(float dip){ float density=getContext().getResources().getDisplayMetrics().density; return (int)(dip*density+0.5f); }} private int getScreenWidth(){ WindowManager manager= (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE); Display display=manager.getDefaultDisplay(); if(Build.VERSION.SDK_INT>=13){ Point point=new Point(); display.getSize(point); return point.x; }else { return display.getWidth(); } }
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矩形计算
Activity调用
@Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.colorprogressbar); mBtStart1= (Button) findViewById(R.id.bt1); bar1= (ColorProgressBar) findViewById(R.id.cp1); mBtStart1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { bar1.setCurrentValue(270); } }); }
自定义属性
<declare-styleable name="ColorProgressBar"> <attr name="back_color" format="color"></attr> <attr name="front_color" format="color"></attr> <attr name="back_width" format="dimension"></attr> <attr name="front_width" format="dimension"></attr> </declare-styleable>
布局
注意:为了使用自定义属性需要添加一行代码(AS)
xmlns:app="http://schemas.android.com/apk/res-auto"
布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <Button android:id="@+id/bt1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="start1"/> <com.demo.demo.networkdemo.colorprogressbar.widget.ColorProgressBar android:id="@+id/cp1" android:layout_width="232dp" android:layout_height="match_parent" android:layout_gravity="center_horizontal" app:back_color="@color/colorPrimary" app:front_color="@color/colorAccent" android:background="@mipmap/ic_launcher"/> </LinearLayout>
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