自定义控件TextView

public class defineTextView extends TextView {

    Context context;
public defineTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        this.context=context;
    }
    public defineTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        this.context=context;
    }
    public defineTextView(Context context) {
        super(context);
        this.context=context;
    }
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
            Drawable[] drawable=getCompoundDrawables();
            int drawablewidth=drawable[0].getIntrinsicWidth();
            float textwidth=getPaint().measureText(getText().toString());
            int drawablepadding=getCompoundDrawablePadding();
            int bodywidth=(int) (drawablepadding+textwidth+drawablewidth);
            canvas.translate((getWidth()-bodywidth)/2, 0);
            canvas.drawLine(0, getHeight(), getWidth(), getHeight(), getPaint());
        super.onDraw(canvas);
    }
    @Override
    public void setTextSize(float size) {

        super.setTextSize(size);
    }