自定義視圖不能繪製

Question

我正在創建一個自定義視圖但它不顯示。我已經將它的屬性添加到了attrs.xml中。我已經實現了它的構造函數，我只畫了一個圓弧和一個橢圓，但它不顯示。

它沒有給出任何錯誤但不顯示。

我在XML中添加他們像<package.above.Pie>

我在哪裏錯了..

public class Pie extends View 
{ 
    Context cont; 

    public int eventValue = 0; 

    RectF mediumOval; 

    RectF oval; 

    Paint p1; 

    Paint p2; 

    Paint p3; 

    Paint p4; 

    Paint p5; 

    RectF smallOval; 

    int width; 

    public Pie(Context context, AttributeSet attrs, int defStyleAttr) 
    { 
     super(context, attrs, defStyleAttr);  

     cont = context; 


     final TypedArray styled = context.getTheme().obtainStyledAttributes(attrs, R.styleable.Pie, 0, 0); 

     eventValue = styled.getInteger(R.styleable.Pie_eventValue, 16); 

     styled.recycle(); 

     myInit(); 
    } 

    public Pie(Context context, AttributeSet attrs) 
    { 
     this(context,attrs,0); 
    } 

    public Pie(Context context) 
    { 
     super(context); 

     cont = context; 

     myInit(); 
    } 



    public void setEventValue(int eValue) 
    { 
     eventValue = eValue; 
    } 

    public void myInit() 
    { 
     width = getWidth(); 

     p1 = new Paint(1); 
     p1.setColor(Color.rgb(86, 86, 86)); 
     p1.setStyle(android.graphics.Paint.Style.FILL); 


     p2 = new Paint(1); 
     p2.setColor(Color.rgb(245, 109, 89)); 
     p2.setStyle(android.graphics.Paint.Style.FILL); 


     p3 = new Paint(1); 
     p3.setColor(Color.rgb(71, 71, 71)); 
     p3.setStyle(android.graphics.Paint.Style.FILL); 


     p4 = new Paint(1); 
     p4.setColor(Color.rgb(247, 247, 247)); 
     p4.setStyle(android.graphics.Paint.Style.FILL); 

     p5 = new Paint(1); 
     p5.setColor(Color.rgb(246, 246, 246)); 
     p5.setStyle(android.graphics.Paint.Style.FILL); 

     mediumOval = new RectF(); 

     oval = new RectF(); 

     smallOval = new RectF(); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) 
    { 
     super.onDraw(canvas); 

     int i = width/4; 

     oval.set(i - i/2, i/2, i * 3 + i/2, i * 3 + i/2); 

     mediumOval.set(i - i/4, i - i/4, i * 3 + i/4, i * 3 + i/4); 

     smallOval.set(i, i, i * 3, i * 3); 

     canvas.drawOval(oval, p1); 

     canvas.drawArc(oval, -90F, (int)Math.round((360D * Double.valueOf(eventValue).doubleValue())/100D), true, p2); 

     canvas.drawOval(mediumOval, p3); 

     canvas.drawOval(smallOval, p1); 
    } 

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
    { 
     super.onMeasure(widthMeasureSpec, heightMeasureSpec); 

     int desiredWidth = width; 


     int desiredHeight = width; 


     int widthMode = android.view.View.MeasureSpec.getMode(widthMeasureSpec); 


     int widthSize = android.view.View.MeasureSpec.getSize(widthMeasureSpec); 


     int heightMode = android.view.View.MeasureSpec.getMode(heightMeasureSpec); 


     int heightSize = android.view.View.MeasureSpec.getSize(heightMeasureSpec); 


     int measuredWidth; 


     int measuredHeight; 

     if (widthMode == MeasureSpec.EXACTLY)   
     {  
      measuredWidth = widthSize ;   
     }   
     else if (widthMode == MeasureSpec.AT_MOST) 

     {  
      measuredWidth = Math.min(desiredWidth , widthSize);  
     } 
     else   
     { 
      measuredWidth = desiredWidth;  
     } 



     if (heightMode == MeasureSpec.EXACTLY) 
     { 
      measuredHeight = heightSize ; 
     } 
     else if (heightMode == MeasureSpec.AT_MOST) 
     { 
      measuredHeight = Math.min(desiredHeight, heightSize); 
     } 
     else 
     { 
      measuredHeight = desiredHeight; 
     } 
     setMeasuredDimension(measuredWidth, measuredHeight); 
    } 
} 

Answer 1

在你的onDraw（）方法的寬度值越來越爲0（零）..

改變這一行

int i = width/4; 

到

int i = getWidth()/4;