Android中自定义View的实现方式总结大全

@Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);   final int paddingLeft = getPaddingLeft();  final int paddingRight = getPaddingRight();  final int paddingTop = getPaddingTop();  final int paddingBottom = getPaddingBottom();   //get the view's width and height and decide the radiu  int width = getWidth() - paddingLeft - paddingRight;  int height = getHeight() - paddingTop - paddingBottom;  radiu = Math.min(width , height) / 2 - boundWidth - progressWidth;   //setup the paint  paint.setStyle(Paint.Style.STROKE);  paint.setStrokeWidth(boundWidth);  paint.setColor(Color.BLACK);   //draw the inner circle  int centerX = paddingLeft + getWidth()/2;  int centerY = paddingTop + getHeight() / 2;  canvas.drawCircle(centerX,centerY, radiu, paint);     float totalRadiu = radiu +boundWidth +progressWidth/2;   //draw the circlr pic  if (drawable != null&&bitmap == null) {   image = ((BitmapDrawable) drawable).getBitmap();    bitmap = Bitmap.createBitmap((int)(2*totalRadiu),(int)(2*totalRadiu), Bitmap.Config.ARGB_8888);   Canvas bitmapCanvas = new Canvas(bitmap);    Paint bitmapPaint = new Paint();   bitmapPaint.setAntiAlias(true);    bitmapCanvas.drawCircle(totalRadiu, totalRadiu, radiu, bitmapPaint);    bitmapPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));   bitmapCanvas.drawBitmap(image,null,new RectF(0,0,2*totalRadiu,2*totalRadiu) , bitmapPaint);    }  Rect rect = new Rect((int)(centerX -totalRadiu),(int)(centerY-totalRadiu),(int)(centerX+totalRadiu),(int)(centerY+ totalRadiu));  canvas.save();  if(isRotate)  canvas.rotate(rotateDegree,centerX,centerY);  canvas.drawBitmap(bitmap,null ,rect, paint);   canvas.restore();  //set paint for arc  paint.setStrokeWidth(progressWidth);  paint.setStrokeCap(Paint.Cap.ROUND);   //prepare for draw arc  RectF oval = new RectF();  oval.left = centerX -totalRadiu ;  oval.top =centerY- totalRadiu ;  oval.right = centerX + totalRadiu;  oval.bottom = centerY+ totalRadiu;  paint.setColor(progressBackColor);   //draw background arc  canvas.drawArc(oval, arcStar, arcEnd, false, paint);   //draw progress arc  paint.setColor(progressColor);  canvas.drawArc(oval, arcStar, progress, false, paint); }

 public MyView(Context context, AttributeSet attrs) {   super(context, attrs);   LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);   inflater.inflate(R.layout.imagebtn, this);   imageView=(ImageView) findViewById(R.id.imageView1);   textView=(TextView)findViewById(R.id.textView1);   }