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本篇內(nèi)容介紹了“Android自定義View實現(xiàn)體重表盤的方法是什么”的有關(guān)知識,在實際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
如下圖所示,起點角度為150,終點角度為240
白色圓弧為整個圓弧范圍,藍(lán)色圓弧為根據(jù)數(shù)據(jù)變動而覆蓋白色圓弧,藍(lán)色圓弧比白色圓弧大一點,突出顯示
InnerArcPaint.setStrokeWidth( Width * (float)0.1 ); OuterArcPaint.setStrokeWidth( Width * (float)0.12 );
中間的水滴指針是一個白色的水滴圖片,下圖藍(lán)色為選擇文件的背景顏色(截圖),由于水滴指向-135度,將圖像旋轉(zhuǎn)-75度,水滴尖剛好指向150度的起點。
private void InitPaint(){ InnerArcPaint = new Paint( ); InnerArcPaint.setColor( Color.WHITE ); InnerArcPaint.setAntiAlias( true ); InnerArcPaint.setStyle( Paint.Style.STROKE ); OuterArcPaint = new Paint( ); OuterArcPaint.setColor( Color.BLUE ); OuterArcPaint.setAntiAlias( true ); OuterArcPaint.setStyle( Paint.Style.STROKE ); OuterArcPaint.setShadowLayer( (float)10,(float)10,(float)10,Color.parseColor( "#99000000" ) ); TextPaint = new Paint( ); TextPaint.setColor( Color.RED ); TextPaint.setStyle( Paint.Style.STROKE ); TextPaint.setTextSize( 60 ); TextPaint.setStrokeWidth( 2 ); ScalePaint = new Paint( ); ScalePaint.setColor( Color.WHITE ); ScalePaint.setTextSize( 25 ); //硬件加速 setLayerType( LAYER_TYPE_SOFTWARE,null ); }
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure( widthMeasureSpec, heightMeasureSpec ); int Width = MeasureSpec.getSize( widthMeasureSpec ); InnerArcPaint.setStrokeWidth( Width * (float)0.1 ); OuterArcPaint.setStrokeWidth( Width * (float)0.12 ); oval = new RectF( ); oval.left = Width * (float)0.2; oval.top = Width * (float)0.2; oval.right = Width * (float)0.8; oval.bottom = Width * (float)0.8; //寬、高一致,使畫布無論邊長如何變化,都成為一個正方形 setMeasuredDimension( Width,Width ); }
//繪制內(nèi)圓弧 private void DrawInnerArc(Canvas canvas){ //保存之前的畫布 canvas.save(); canvas.drawArc( oval, StartAngle,SweepAngle,false,InnerArcPaint); }
//繪制外圓弧 private void DrawOuterArc(Canvas canvas){ canvas.save(); canvas.drawArc( oval, StartAngle,SweepAngle * CurrentData / 300,false,OuterArcPaint); }
//繪制中間指針 private void DrawArrow(Canvas canvas){ canvas.save(); Bitmap bitmap = BitmapFactory.decodeResource( getResources(),R.mipmap.waterdrop ); int width = 75; int height = 75; int NewWidth = (int)(getWidth() * 0.08); float ScaleWidth = (float) (NewWidth / width); float ScaleHeight = (float) (NewWidth / height); Matrix matrix = new Matrix( ); //順序不能顛倒 matrix.setRotate( -75 + (SweepAngle * CurrentData / 300),bitmap.getWidth()/2,bitmap.getHeight()/2 ); matrix.postScale( ScaleWidth,ScaleHeight ); Bitmap bitmap1 = Bitmap.createBitmap( bitmap,0,0,width,height,matrix,true ); canvas.drawBitmap( bitmap1,getWidth()/2 - bitmap1.getWidth()/2,getHeight()/2 - bitmap1.getHeight()/2,InnerArcPaint ); bitmap.recycle(); bitmap1.recycle(); }
private void DrawCurrentDataText(Canvas canvas){ canvas.save(); Rect rect = new Rect( ); String str = String.valueOf( CurrentData ) + "KG"; TextPaint.setColor( Color.RED ); TextPaint.getTextBounds( str,0,str.length(),rect ); canvas.drawText( str,getWidth()/2 - rect.width()/2,(int)(getHeight() * (float)0.38),TextPaint ); }
private void DrawScaleRightText(Canvas canvas){ canvas.save(); Rect rect = new Rect( ); String str = "300KG"; TextPaint.setTextSize( 45 ); TextPaint.getTextBounds( str,0,str.length(),rect ); TextPaint.setColor( Color.WHITE ); canvas.drawText( str,getWidth()-getWidth()/6,(getHeight()/2+getWidth()/5) ,TextPaint ); } private void DrawScaleLeftText(Canvas canvas){ canvas.save(); Rect rect = new Rect( ); String str = "0KG"; TextPaint.setTextSize( 45 ); TextPaint.getTextBounds( str,0,str.length(),rect ); TextPaint.setColor( Color.WHITE ); canvas.drawText( str,(getWidth()/2-(getWidth()/3 + 75)),(getHeight()/2+getWidth()/5) ,TextPaint ); }
public void SetCurrentData(final float data, TimeInterpolator interpolator){ long time = ( (long)Math.abs( data- CurrentData ) *20); final ValueAnimator valueAnimator = ValueAnimator.ofFloat( CurrentData,data ).setDuration( time ); valueAnimator.setInterpolator( interpolator ); valueAnimator.addUpdateListener( new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { CustomView_ClockDial.this.CurrentData = (float)valueAnimator.getAnimatedValue(); invalidate(); } } ); valueAnimator.start(); }
public class CustomView_ClockDial extends View { //內(nèi)圓弧畫筆 private Paint InnerArcPaint; //外圓弧畫筆 private Paint OuterArcPaint; //文字畫筆 private Paint TextPaint; //刻度畫筆 private Paint ScalePaint; //圓弧范圍 private RectF oval; //當(dāng)前數(shù)據(jù) private float CurrentData = 0; //起點角度 private float StartAngle = 150; //終點角度 private float SweepAngle = 240; public CustomView_ClockDial(Context context) { super( context ); InitPaint(); } public CustomView_ClockDial(Context context, @Nullable AttributeSet attrs) { super( context, attrs ); InitPaint(); } public CustomView_ClockDial(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super( context, attrs, defStyleAttr ); InitPaint(); } private void InitPaint(){ InnerArcPaint = new Paint( ); InnerArcPaint.setColor( Color.WHITE ); InnerArcPaint.setAntiAlias( true ); InnerArcPaint.setStyle( Paint.Style.STROKE ); OuterArcPaint = new Paint( ); OuterArcPaint.setColor( Color.BLUE ); OuterArcPaint.setAntiAlias( true ); OuterArcPaint.setStyle( Paint.Style.STROKE ); OuterArcPaint.setShadowLayer( (float)10,(float)10,(float)10,Color.parseColor( "#99000000" ) ); TextPaint = new Paint( ); TextPaint.setColor( Color.RED ); TextPaint.setStyle( Paint.Style.STROKE ); TextPaint.setTextSize( 60 ); TextPaint.setStrokeWidth( 2 ); ScalePaint = new Paint( ); ScalePaint.setColor( Color.WHITE ); ScalePaint.setTextSize( 25 ); //硬件加速 setLayerType( LAYER_TYPE_SOFTWARE,null ); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure( widthMeasureSpec, heightMeasureSpec ); int Width = MeasureSpec.getSize( widthMeasureSpec ); InnerArcPaint.setStrokeWidth( Width * (float)0.1 ); OuterArcPaint.setStrokeWidth( Width * (float)0.12 ); oval = new RectF( ); oval.left = Width * (float)0.2; oval.top = Width * (float)0.2; oval.right = Width * (float)0.8; oval.bottom = Width * (float)0.8; //寬、高一致,使畫布無論邊長如何變化,都成為一個正方形 setMeasuredDimension( Width,Width ); } @Override protected void onDraw(Canvas canvas) { super.onDraw( canvas ); DrawInnerArc(canvas); DrawOuterArc(canvas); DrawArrow(canvas); DrawCurrentDataText(canvas); DrawScaleRightText(canvas); DrawScaleLeftText(canvas); } //繪制內(nèi)圓弧 private void DrawInnerArc(Canvas canvas){ //保存之前的畫布 canvas.save(); canvas.drawArc( oval, StartAngle,SweepAngle,false,InnerArcPaint); } //繪制外圓弧 private void DrawOuterArc(Canvas canvas){ canvas.save(); canvas.drawArc( oval, StartAngle,SweepAngle * CurrentData / 300,false,OuterArcPaint); } //繪制中間指針 private void DrawArrow(Canvas canvas){ canvas.save(); Bitmap bitmap = BitmapFactory.decodeResource( getResources(),R.mipmap.waterdrop ); int width = 75; int height = 75; int NewWidth = (int)(getWidth() * 0.08); float ScaleWidth = (float) (NewWidth / width); float ScaleHeight = (float) (NewWidth / height); Matrix matrix = new Matrix( ); //順序不能顛倒 matrix.setRotate( -75 + (SweepAngle * CurrentData / 300),bitmap.getWidth()/2,bitmap.getHeight()/2 ); matrix.postScale( ScaleWidth,ScaleHeight ); Bitmap bitmap1 = Bitmap.createBitmap( bitmap,0,0,width,height,matrix,true ); canvas.drawBitmap( bitmap1,getWidth()/2 - bitmap1.getWidth()/2,getHeight()/2 - bitmap1.getHeight()/2,InnerArcPaint ); bitmap.recycle(); bitmap1.recycle(); } private void DrawCurrentDataText(Canvas canvas){ canvas.save(); Rect rect = new Rect( ); String str = String.valueOf( CurrentData ) + "KG"; TextPaint.setColor( Color.RED ); TextPaint.getTextBounds( str,0,str.length(),rect ); canvas.drawText( str,getWidth()/2 - rect.width()/2,(int)(getHeight() * (float)0.38),TextPaint ); } private void DrawScaleRightText(Canvas canvas){ canvas.save(); Rect rect = new Rect( ); String str = "300KG"; TextPaint.setTextSize( 45 ); TextPaint.getTextBounds( str,0,str.length(),rect ); TextPaint.setColor( Color.WHITE ); canvas.drawText( str,getWidth()-getWidth()/6,(getHeight()/2+getWidth()/5) ,TextPaint ); } private void DrawScaleLeftText(Canvas canvas){ canvas.save(); Rect rect = new Rect( ); String str = "0KG"; TextPaint.setTextSize( 45 ); TextPaint.getTextBounds( str,0,str.length(),rect ); TextPaint.setColor( Color.WHITE ); canvas.drawText( str,(getWidth()/2-(getWidth()/3 + 75)),(getHeight()/2+getWidth()/5) ,TextPaint ); } public void SetCurrentData(final float data, TimeInterpolator interpolator){ long time = ( (long)Math.abs( data- CurrentData ) *20); final ValueAnimator valueAnimator = ValueAnimator.ofFloat( CurrentData,data ).setDuration( time ); valueAnimator.setInterpolator( interpolator ); valueAnimator.addUpdateListener( new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { CustomView_ClockDial.this.CurrentData = (float)valueAnimator.getAnimatedValue(); invalidate(); } } ); valueAnimator.start(); } }
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