Android自定义View实现五星好评效果

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>

  
    
    
    
  

/**
 * Created by Michael on 2019/11/1.
 */
 
public class RatingStar extends View {
 
  private int normalId;
  private int focusId;
  private Bitmap normalImg;
  private Bitmap focusImg;
  private int number;
  private int w1;
  private int h1;
  private int marginLeft;
  private int marginTop;
  private int marginBottom;
  private int marginRight;
  private int height;
  private int width;
  private int p;
  private float w0;
  private int i0;
  private int mGrade;
 
  public RatingStar(Context context) {
    this(context,null);
  }
 
  public RatingStar(Context context, @Nullable AttributeSet attrs) {
    this(context, attrs,0);
  }
 
  public RatingStar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.RatingStar);
    normalId = array.getResourceId(R.styleable.RatingStar_starNormal,0);
    focusId = array.getResourceId(R.styleable.RatingStar_starFocus,0);
    normalImg = BitmapFactory.decodeResource(getResources(), normalId);
    focusImg = BitmapFactory.decodeResource(getResources(), focusId);
    number = array.getInteger(R.styleable.RatingStar_starNumber,5);
    array.recycle();
    i0 = -1;
 
  }
 
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    w1 = normalImg.getWidth();
    h1 = normalImg.getHeight();
    //中间间隔
    p = 30;
    marginTop = 20;
    marginBottom = 20;
    marginLeft = 20;
    marginRight = 20;
    height = h1 + marginTop + marginBottom;
    width = w1 *number+(number-1)*p +marginLeft+marginRight;
    setMeasuredDimension(width, height);
  }
 
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    for (int i = 0; i