参考自：https://www.sunofbeach.net/a/1261253615473975296

@SuppressLint("ClickableViewAccessibility")
    public void disableCopyAndPaste(final EditText editText) {
        try {
            if (editText == null) {
                return ;
            }

            editText.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    return true;
                }
            });
            editText.setLongClickable(false);
            editText.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    if (event.getAction() == MotionEvent.ACTION_DOWN) {
                        // setInsertionDisabled when user touches the view
                        setInsertionDisabled(editText);
                    }

                    return false;
                }
            });
            editText.setCustomSelectionActionModeCallback(new ActionMode.Callback() {
                @Override
                public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                    return false;
                }

                @Override
                public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
                    return false;
                }

                @Override
                public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                    return false;
                }

                @Override
                public void onDestroyActionMode(ActionMode mode) {

                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void setInsertionDisabled(EditText editText) {
        try {
            Field editorField = TextView.class.getDeclaredField("mEditor");
            editorField.setAccessible(true);
            Object editorObject = editorField.get(editText);

            // if this view supports insertion handles
            Class editorClass = Class.forName("android.widget.Editor");
            Field mInsertionControllerEnabledField = editorClass.getDeclaredField("mInsertionControllerEnabled");
            mInsertionControllerEnabledField.setAccessible(true);
            mInsertionControllerEnabledField.set(editorObject, false);

            // if this view supports selection handles
            Field mSelectionControllerEnabledField = editorClass.getDeclaredField("mSelectionControllerEnabled");
            mSelectionControllerEnabledField.setAccessible(true);
            mSelectionControllerEnabledField.set(editorObject, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

使用：
disableCopyAndPaste(editText);