Megrez

public class TextView extends View implements ViewTreeObserver.OnPreDrawListener {}

/**
 * Subclasses override this to specify that they have a KeyListener
 * by default even if not specifically called for in the XML options.
 */
protected boolean getDefaultEditable();

/**
 * Subclasses override this to specify a default movement method.
 */
protected MovementMethod getDefaultMovementMethod();

/**
 * Return the text the TextView is displaying as an Editable object.  If
 * the text is not editable, null is returned.
 *
 * @see #getText
 */
public Editable getEditableText();

 /**
 *
 * Returns the state of the {@code textIsSelectable} flag (See
 * {@link #setTextIsSelectable setTextIsSelectable()}). Although you have to set this flag
 * to allow users to select and copy text in a non-editable TextView, the content of an
 * {@link EditText} can always be selected, independently of the value of this flag.
 * <p>
 *
 * @return True if the text displayed in this TextView can be selected by the user.
 *
 * @attr ref android.R.styleable#TextView_textIsSelectable
 */
public boolean isTextSelectable();

...
valueEditText.setSingleLine(isSingleLine);
valueEditText.setMaxLines(array.getInt(R.styleable.WhosvWidget_android_maxLines, 1));
valueEditText.setInputType(array.getInt(R.styleable.WhosvWidget_android_inputType, InputType.TYPE_CLASS_TEXT));
...

valueEditText.setOnKeyListener(new View.OnKeyListener(){
  @Override
  public boolean onKey(View v, int keyCode, KeyEvent event) {
    int MaxLines = ((EditText)v).getMaxLines();
    if (!isSingleLine && MaxLines > 1 && keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_UP) {
      // 获取光标所在位置
      int index = ((EditText)v).getSelectionStart();
      // 获取EditText文本内容
      String text = ((EditText)v).getText().toString();
      // 获取行数
      if(text.substring(index-1,index).equals("\n"))
        index = index - 1;
      String singleEnterText = text.replaceAll("[\\n]+","\n");
      ((EditText) v).setText(singleEnterText);
      int editTextRowCount = ((EditText) v).getLineCount();
      if(index > singleEnterText.length())
        index = singleEnterText.length();
      ((EditText) v).setSelection(index);
      Timber.d("text:"+text+",rows:"+editTextRowCount+",maxLines:"+MaxLines);
      if(editTextRowCount > MaxLines) {
        int lastBreakIndex = text.lastIndexOf("\n");
        String newText = text.substring(0, lastBreakIndex);
        ((EditText) v).setText("");
        ((EditText) v).append(newText);
      }
    }
    return false;
  }
});

private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {

    // Called when the action mode is created; startActionMode() was called
    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        // Inflate a menu resource providing context menu items
        MenuInflater inflater = mode.getMenuInflater();
        inflater.inflate(R.menu.context_menu, menu);
        return true;
    }

    // Called each time the action mode is shown. Always called after onCreateActionMode, but
    // may be called multiple times if the mode is invalidated.
    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false; // Return false if nothing is done
    }

    // Called when the user selects a contextual menu item
    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_share:
                shareCurrentItem();
                mode.finish(); // Action picked, so close the CAB
                return true;
            default:
                return false;
        }
    }

    // Called when the user exits the action mode
    @Override
    public void onDestroyActionMode(ActionMode mode) {
        mActionMode = null;
    }
};

someView.setOnLongClickListener(new View.OnLongClickListener() {
    // Called when the user long-clicks on someView
    public boolean onLongClick(View view) {
        if (mActionMode != null) {
            return false;
        }

        // Start the CAB using the ActionMode.Callback defined above
        mActionMode = getActivity().startActionMode(mActionModeCallback);
        view.setSelected(true);
        return true;
    }
});