如何在调整TextView大小时自动换行？

可以使用自定义的TextView并结合TextWatcher实现该功能。首先，重写TextView的onTextChanged方法，在其中通过计算当前文本宽度和TextView的宽度得出是否需要自动换行。如果需要，就在当前光标位置插入一个换行符。代码示例如下：

public class WrapContentTextView extends TextView {
  private int mLastWidth = 0;
  public WrapContentTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
  @Override
  protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
    if (getWidth() == mLastWidth) {
      return;
    mLastWidth = getWidth();
    int lineCount = getLineCount();
    int lineHeight = getHeight() / lineCount;
    Layout layout = getLayout();
    int lastLineStart = layout.getLineStart(lineCount - 1);
    int lastLineEnd = layout.getLineEnd(lineCount - 1);
    int lastLineWidth = (int) layout.getLineWidth(lineCount - 1);
    if (lastLineWidth > getWidth()) {
      String newText = text.subSequence(0, lastLineStart) + "\n" + text.subSequence(lastLineStart, text.length());
      setText(newText);
      setSelection(lastLineStart + 1);
然后在Activity中使用这个自定义的TextView，并添加TextWatcher监听器，如下所示：
WrapContentTextView textView = findViewById(R.id.text_view);
textView.addTextChangedListener(new TextWatcher() {
  @Override
  public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
  @Override
  public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    // do something
  @Override
  public void afterTextChanged(Editable editable) {
    // do something
这样，在TextView的文本内容发生改变时，会自动进行换行。