Android中多行文本末尾添加图片排版问题的解决方法

 final TextView text = findViewById(R.id.text);
 final String string = "dkffkdjkfjdkfjkdjfdjfkjdkfjkdjkdjfkjdkjk";
 //创建一个SpannableString对象，后面增加空格是预留给图片的
 SpannableString spannableString = new SpannableString(string + " ");
 //创建图片的Drawable对象
 Drawable drawable = getResources().getDrawable(R.mipmap.copy);
 drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
 //创建图片的ImageSpan对象
 ImageSpan imageSpan = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);
 //设置ImageSpan，将其位置设置在spannableString最后面，起始位置start=spannableString.length() - 1，结束位置为end=spannableString.length(),
 // SPAN_INCLUSIVE_EXCLUSIVE表示包含start不包含end
 spannableString.setSpan(imageSpan, spannableString.length() - 1, spannableString.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
 text.setText(spannableString);

//先设置原始文本
text.setText(string);
//使用post方法，在TextView完成绘制流程后在消息队列中被调用
text.post(new Runnable() {
 @Override
 public void run() {
  //获取第一行的宽度
  float lineWidth = text.getLayout().getLineWidth(0);
  //获取第一行最后一个字符的下标
  int lineEnd = text.getLayout().getLineEnd(0);
  //计算每个字符占的宽度
  float widthPerChar = lineWidth / (lineEnd + 1);
  //计算TextView一行能够放下多少个字符
  int numberPerLine = (int) Math.floor(text.getWidth() / widthPerChar);
  //在原始字符串中插入一个空格，插入的位置为numberPerLine - 1
  StringBuilder stringBuilder = new StringBuilder(string).insert(numberPerLine - 1, " ");

  //SpannableString的构建
  SpannableString spannableString = new SpannableString(stringBuilder.toString() + " ");
  Drawable drawable = getResources().getDrawable(R.mipmap.copy);
  drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
  ImageSpan imageSpan = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);
  spannableString.setSpan(imageSpan, spannableString.length() - 1, spannableString.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
  text.setText(spannableString);
 }
});