如何在Android中利用TextView实现一个内容居中效果

package com.test.signcalendar.weight;import android.content.Context;import android.graphics.Canvas;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.TextView;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);  }}