共享textView文本以及复制，共享和选择所有功能

Question

我做过同样的事情，就像在单点触摸文本上是复制，共享和选择所有文本，在双指上触摸文本是在Activity类中进行放大和缩小一样。但是，当我在片段类文本视图中执行相同的操作时，它只会放大和缩小文本，而无法显示复制，共享和全部选择的功能，仅通过单指触摸即可完成。

public class MainActivity extends Activity implements View.OnTouchListener {

    final static float STEP = 200;
    TextView mytv;
    float mRatio = 1.0f;
    int mBaseDist;
    float mBaseRatio;
    float fontsize = 13;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mytv = (TextView) findViewById(R.id.mytv);
        mytv.setTextSize(mRatio + 13);

    }

    public boolean onTouchEvent(MotionEvent event) {
        if (event.getPointerCount() == 2) {
            int action = event.getAction();
            int pureaction = action & MotionEvent.ACTION_MASK;
            if (pureaction == MotionEvent.ACTION_POINTER_DOWN) {
                mBaseDist = getDistance(event);
                mBaseRatio = mRatio;
            } else {
                float delta = (getDistance(event) - mBaseDist) / STEP;
                float multi = (float) Math.pow(2, delta);
                mRatio = Math.min(1024.0f, Math.max(0.1f, mBaseRatio * multi));
                mytv.setTextSize(mRatio + 13);
            }
        }
        else if(event.getPointerCount()==1){
            mytv.setTextIsSelectable(true);

        }
        return true;
    }

    int getDistance(MotionEvent event) {
        int dx = (int) (event.getX(0) - event.getX(1));
        int dy = (int) (event.getY(0) - event.getY(1));
        return (int) (Math.sqrt(dx * dx + dy * dy));
    }

    public boolean onTouch(View v, MotionEvent event) {
        return false;
    }

}

和片段类代码

public class DetailContentFragment extends Fragment  implements View.OnTouchListener {

    private OnDetailedContentFragmentInteractionListener mListener;

    FragmentDetailContentBinding binding;
    final static float STEP = 200;
    private Toast toast;
    float mRatio = 1.0f;
    int mBaseDist;
    float mBaseRatio;
    float fontsize = 50;

    public static DetailContentFragment newInstance(String param1, String param2) {
        DetailContentFragment fragment = new DetailContentFragment();
        Bundle args = new Bundle();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

       binding = DataBindingUtil.inflate(LayoutInflater.from(getContext()),R.layout.fragment_detail_content, container, false);
        setHasOptionsMenu(true);

        binding.descriptionText.setTextSize(mRatio + 13);

        binding.descriptionText.setOnTouchListener(new View.OnTouchListener() {

            public boolean onTouch(View view, MotionEvent event) {
                if (event.getPointerCount() == 2) {
                    int action = event.getAction();
                    Log.e("hello " ,binding.descriptionView.toString());
                    int pureaction = action & MotionEvent.ACTION_MASK;
                    if (pureaction == MotionEvent.ACTION_POINTER_DOWN) {

                        mBaseDist =getDistance(event);
                        mBaseRatio = mRatio;
                    } else {
                        float delta = (getDistance(event) - mBaseDist) / STEP;
                        float multi = (float) Math.pow(2, delta);
                        mRatio = Math.min(1024.0f, Math.max(0.1f, mBaseRatio * multi));

                        if(mRatio>47.504753) {
                            mRatio = (float) 47.504753;

                            if (toast != null) {
                                toast.cancel();
                            }
                            toast = Toast.makeText(getContext(),"Text is zoom enough to see",Toast.LENGTH_SHORT);
                            toast.show();

                        }

                        binding.descriptionText.setTextSize(mRatio + 13);
                    }
                }
                else if(event.getPointerCount() == 1){
                    binding.descriptionText.setTextIsSelectable(true);
                }


                return true;
            }
      });


        return binding.getRoot();
    }

        int getDistance(MotionEvent event) {
        int dx = (int) (event.getX(0) - event.getX(1));
        int dy = (int) (event.getY(0) - event.getY(1));

        return (int) (Math.sqrt(dx * dx + dy * dy));
    }

  @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        return false;
    }
}