studio - programacion android pdf 2018

Seleccionar texto en TextView e invocar menú flotante al hacer clic largo

Question

Tengo un TextView con el que intento asociar el menú contextual flotante activado al hacer clic con el botón largo. Necesito que el texto en el TextView sea ​​seleccionable y una vez que se hace la selección (haciendo un clic largo), el texto seleccionado se utilizará como entrada a las opciones en el menú contextual flotante.
Al presionar TextView , el menú contextual aparece antes de que se muestre el rango de selección de texto. Esto es diferente si utilizo el menú de la Contextual Action Bar contextual en su lugar, que se invoca al mantener pulsado solo después de que se ha seleccionado el texto en la pantalla.

Mis preguntas):
1. ¿Cómo me aseguro de que se ingrese el modo de selección de texto antes de invocar el menú contextual?

package com.sriram.hellotts;

import java.io.File;
import java.io.Serializable;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Environment;
import android.text.Spannable;
import android.text.style.BackgroundColorSpan;
import android.util.Log;
import android.view.ActionMode;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class HelloTTS extends Activity {

    //ui elements.
    //private ImageButton playBtn;
    private Button playBtn;
    private TextView tv;

    private boolean longClick = false;
    private String chosenText;

    private int count = 1;

    private int REQUEST_RETURN_SETTINGS = 2;

    private static final int RECORDER_RETURN = 1;  //request code.

    //text to read.
    private String content = "MUMBAI: Whatever the general market trend, Mumbai''s realty market does not stop " +
            "creating new records. In the costliest apartment deal in the country, a sea-facing duplex in a Malabar Hill" +
            " building was recently sold for Rs 57 crore or roughly Rs 1.35 lakh a sq ft., an increase of over 15% year on year." +
            " The duplex in the tony Darshan Apartments on Mount Pleasant Road was sold last month to the Bulchandanis," +
            " a prominent business family with interests in software, aluminium and real estate. They own three other duplexes " +
            "in the same complex. The family''s latest acquisition (flat number 111) sits on the 9th, 10th and 11th floors of the " +
            "complex''s ''A'' wing, has four bedrooms and is spread over 3,510 sq ft. It comes with attached terraces of 1,386 sq ft " +
            "on the 11th and 12th floors and a covered garage of about 700 sq ft./n" + 
            " NEW DELHI: A bunch of skulls of human ancestors dating back to 1.8 million years ago has created a storm among scientists." +
            "The discovery suggests that three human ancestor species were actually just one, with variations in features." + 
            " Five hominid skulls were found by scientists in Dmanisi, Georgia in 2005. The site is well-known for having revealed" +
            " a range of fossils. Of the five skulls, one was found to fit with a jaw bone found in 2000 at the same site." + 
            " This fitting together gave rise to a complete skull. Informally known as /"skull 5/", it /"is the most complete skull" +
            " of an adult from this date/", says Marcia Ponce de Leon, of the Anthropological Institute and Museum in Zurich, Switzerland," + 
            " and one of the authors of the study.";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hello_tts);

        //prevent window from going to sleep.
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        //hierarchical navigation.
        getActionBar().setDisplayHomeAsUpEnabled(true);

        //get ui elements and add relevant functionality.
        tv = (TextView) findViewById(R.id.tv);

        //set other features for textview.
        tv.setFocusable(true);


        Log.v(this.toString(), "Setting content for textview: " + content);
        tv.setText(content);

        tv.setOnLongClickListener(new View.OnLongClickListener() {

            @Override
            public boolean onLongClick(View v) {
                Log.v(this.toString(), "Long click of EditText.");
                tv.setCursorVisible(true);
                longClick = true;

                //if the TTS is speaking, pause it.
                if(TTS != null) {
                    if(TTS.isSpeaking()) {
                        TTS.pause();
                    }
                }

                //bring up our custom action mode menu.
                Log.v(this.toString(), "Starting actionmodecallback.");
                v.setSelected(true);

                return false;
            }
        });

registerForContextMenu (tv);

        tv.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                int action = event.getAction();

                /* 
                 * On action up,if longClick was active, then chosenText etc. are taken in.
                 */

                switch(action) {
                case (MotionEvent.ACTION_DOWN):
                    Log.v(this.toString(), "Action down.");
                break;

                case (MotionEvent.ACTION_UP):
                    Log.v(this.toString(), "Action up.");
                if(longClick) {
                    Log.v(this.toString(), "Action up after long click. Getting to selecting text.");
                    int start = tv.getSelectionStart();
                    int end = tv.getSelectionEnd();
                    Log.v(this.toString(), "Start = " + start + " and end = " + end);
                    chosenText = tv.getText().toString().substring(start, end);
                }
                longClick = false;  //reset longClick.

                break;

                case (MotionEvent.ACTION_MOVE):
                    Log.v(this.toString(), "Action move.");
                break;

                default:
                    Log.v(this.toString(), "Some other activity seen which is not being handled.");
                break;
                }
                return false;
            }
        });
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.options_menu, menu);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        AdapterContextMenuInfo adcm = (AdapterContextMenuInfo) item.getMenuInfo();
        boolean result = false;
        switch(item.getItemId()) {

        case R.id.option1:
            Log.v(this.toString(), "Option 1 chosen.");
            result = true;
            break;

        case R.id.readFromHere:
            Log.v(this.toString(), "Read from here.");
            result = true;
            break;

        default:
            result = super.onContextItemSelected(item);
            break;
        }
        return result;
    }

El menú de opciones:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

      <item android:id="@+id/readFromHere"
          android:icon="@drawable/ic_launcher"
          android:title="@string/readFromHere" />

      <item android:id="@+id/option1"
          android:icon="@drawable/ic_launcher"
          android:title="@string/record" />   
</menu>