TextView控件中使用android:drawableLeft图片和文字使用gravity只能使文字居中，无法使图片随文字同时居中， 让图片随文字同时居中

1.xml布局

<com.yld.administrator.DrawableCenterTextView    //包名.DrawableCenterTextView  
android:text="同意"   
   android:background="#00ff00"  
    android:layout_width="0dp"     
 android:layout_weight="1"  
    android:layout_height="wrap_content"  
    android:drawableLeft="@mipmap/opendoor9"    
  android:layout_margin="5dp"     />

1.DrawableCenterTextView类

public class DrawableCenterTextView extends android.support.v7.widget.AppCompatTextView{
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);

}
}