代码如下：
Bitmap bitmap = mWebView.getFavicon();
Drawable drawable = new BitmapDrawable(bitmap);
// edit.setCompoundDrawables(drawable, null, null, null);
drawable = this.getResources().getDrawable(R.drawable.history);
edit.setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null);
edit.setText(cur_url);
// edit.setMaxLines(1);
setCompoundDrawablesWithIntrinsicBounds与setCompoundDrawables的区别:
setCompoundDrawables 画的drawable的宽高是按drawable.setBound()设置的宽高，所以才有The Drawables must already have had setBounds(Rect) called.
而setCompoundDrawablesWithIntrinsicBounds是画的drawable的宽高是按drawable固定的宽高，即通过getIntrinsicWidth()与getIntrinsicHeight()获得，所以才有 The Drawables' bounds will be set to their intrinsic bounds.
看下面方法：
public void setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top,
Drawable right, Drawable bottom) {
if (left != null) {
left.setBounds(0, 0, left.getIntrinsicWidth(), left.getIntrinsicHeight());
}
if (right != null) {
right.setBounds(0, 0, right.getIntrinsicWidth(), right.getIntrinsicHeight());
}
if (top != null) {
top.setBounds(0, 0, top.getIntrinsicWidth(), top.getIntrinsicHeight());
}
if (bottom != null) {
bottom.setBounds(0, 0, bottom.getIntrinsicWidth(), bottom.getIntrinsicHeight());
}
setCompoundDrawables(left, top, right, bottom);
}