android TextView图文混写 嵌入表情

private void setImageText()
	{
		//根据ID获取图像的Bitmap对象
		Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
		//创建imageSpan对象
		ImageSpan imageSpan = new ImageSpan(this, bitmap);
		//创建一个SpannableString对imageSpan进行封装
		SpannableString spannableString = new SpannableString("icon哇咔咔");
		//用ImageSpan对象替换icon
		spannableString.setSpan(imageSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
		tv_hello.setText(spannableString);
	}