我有一个TextView，我试图将其与长时间单击时激活的浮动上下文菜单相关联。我需要TextView中的文本是可以选择的，并且一旦做出选择（长按），选定的文本将用作浮动上下文菜单中选项的输入。长按TextView，将在显示文本选择范围之前显示上下文菜单。如果我改用Contextual Action Bar菜单，则情况有所不同，该菜单只有在屏幕上选择了文本后才能长按才能调用。
我的问题：1.如何确保在调用上下文菜单之前已进入文本选择模式？
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;
}
选项菜单：
<?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>
您应将活动与android.intent.action.PROCESS_TEXT一起使用。
这将在浮动菜单中添加一个选项，如下所示：Custoom floating toolbar for text selection controls