Android 让自定义TextView的drawableLeft与文本一起居中

/**
 * drawableLeft与文本一起居中显示
 * 
 * 
 */
public class DrawableCenterTextView extends TextView {

 public DrawableCenterTextView(Context context, AttributeSet attrs,
   int defStyle) {
  super(context, attrs, defStyle);
 }

 public DrawableCenterTextView(Context context, AttributeSet attrs) {
  super(context, attrs);
 }

 public DrawableCenterTextView(Context context) {
  super(context);
 }

 @Override
 protected void onDraw(Canvas canvas) {
  Drawable[] drawables = getCompoundDrawables();
  if (drawables != null) {
   Drawable drawableLeft = drawables[0];
   if (drawableLeft != null) {
    float textWidth = getPaint().measureText(getText().toString());
    int drawablePadding = getCompoundDrawablePadding();
    int drawableWidth = 0;
    drawableWidth = drawableLeft.getIntrinsicWidth();
    float bodyWidth = textWidth + drawableWidth + drawablePadding;
    canvas.translate((getWidth() - bodyWidth) / 2, 0);
   }
  }
  super.onDraw(canvas);
 }
}