DrawableTextView.Java:
package com.xing.drawabletextview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.TextView;
/**
 * Created by Administrator on 2017/2/28.
 */
public class DrawableTextView extends TextView {
  public DrawableTextView(Context context) {
    this(context, null);
  }
  public DrawableTextView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }
  public DrawableTextView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }
  @Override
  protected void onDraw(Canvas canvas) {
    // getCompoundDrawables() : Returns drawables for the left, top, right, and bottom borders.
    Drawable[] drawables = getCompoundDrawables();
    // 得到drawableLeft设置的drawable对象
    Drawable leftDrawable = drawables[0];
    if (leftDrawable != null) {
      // 得到leftDrawable的宽度
      int leftDrawableWidth = leftDrawable.getIntrinsicWidth();
      // 得到drawable与text之间的间距
      int drawablePadding = getCompoundDrawablePadding();
      // 得到文本的宽度
      int textWidth = (int) getPaint().measureText(getText().toString().trim());
      int bodyWidth = leftDrawableWidth + drawablePadding + textWidth;
      canvas.save();
      canvas.translate((getWidth() - bodyWidth) / 2, 0);
    }
    super.onDraw(canvas);
  }
}