我一直在网上搜索类似这样的内容并且没有运气只有一个参考但只适合发布它的用户。我有一个名为OptionsMenu的类，它扩展了AppCompatActivity并实现了OnCreateOptionsMenu。我想知道他们是否是一种初始化此方法或调用它的方法，因为我的OptionsMenu类的新实例并不能使菜单显示。如何调出以便显示菜单选项？
**更新**
这是其中包含OnCreateOptions的类。
package com.mycompany.myapp;
import android.view.*;
import android.app.*;
import android.net.*;
import java.util.*;
import android.widget.ListView;
import android.content.*;
import java.io.*;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.*;
import android.support.v7.widget.*;
public class OptionsMenu extends AppCompatActivity
{
private MusicPlayer musicPlayer;
FileManager fm;
private BlueTheme blueTheme;
private PinkTheme pinkTheme;
private final int blue = Menu.FIRST;
private final int pink = blue + 1;
private int items = 0;
public OptionsMenu(MusicPlayer musicPlayer, FileManager fm , BlueTheme blueTheme , PinkTheme PinkTheme){
this.musicPlayer = musicPlayer;
this.fm = fm;
this.blueTheme = blueTheme;
this.pinkTheme = PinkTheme;
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.clear();
MenuInflater inflator = getMenuInflater();
inflator.inflate(R.menu.sidebar_menu, menu);
SubMenu subMenu = menu.addSubMenu("Themes");
subMenu.add(0 , blue , 0 , "Blue");
subMenu.add(0, pink , 1, "Pink");
items = subMenu.getItem().getItemId();
// tool bar menu
ArrayList<Uri> al = new ArrayList<Uri>();
ArrayList<Uri> emailAl = new ArrayList<Uri>();
MenuItem mi = menu.findItem(R.id.searchable);
MenuItem share = menu.findItem(R.id.share);
mi.setIcon(android.R.drawable.ic_search_category_default);
SearchView searchView = (SearchView) menu.findItem(R.id.searchable).getActionView();
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
ShareActionProvider sap = (ShareActionProvider) MenuItemCompat.getActionProvider(share);
Intent intentShare = new Intent(Intent.ACTION_SEND_MULTIPLE);
Intent intentEmail = new Intent(Intent.ACTION_SEND_MULTIPLE);
intentShare.setType("audio/mp3");
intentEmail.setType("audio/mp3");
Uri uri = null;
Uri uriEmail = null;
//FileInputStream in = null;
//FileOutputStream out = null;
//try{
// for(File file : downloads){
// uri = Uri.fromFile(file);
// in = new FileInputStream(file);
// File outFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), file.getName()); // IMPORTANT! You need to create your file object separately, so you can then pass it to intent as well..
// out = new FileOutputStream(outFile);
// byte[] buf = new byte[1024];
// int len;
// while ( (len = in.read(buf, 0, buf.length)) != -1){
// out.write(buf, 0, len);
// }
// in.close();
// out.flush();
// out.close();
// uriEmail = Uri.fromFile(outFile); // Here you passed the parent directory file.. Pass newly created file object ..
// al.add(uri);
// emailAl.add(uriEmail);
// }
// } catch(IOException e){
// e.printStackTrace();
// }
for(File file : fm.GetDownloadFiles()){
uriEmail = Uri.fromFile(fm.exportFile(file));
}
emailAl.add(uriEmail);
intentShare.putParcelableArrayListExtra(Intent.EXTRA_STREAM,al );
intentEmail.putParcelableArrayListExtra(Intent.EXTRA_STREAM,emailAl);
intentEmail.putExtra(Intent.EXTRA_SUBJECT , "Subject");
intentEmail.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
sap.setShareIntent(intentShare);
sap.setShareIntent(intentEmail);
MenuItemCompat.OnActionExpandListener el = new MenuItemCompat.OnActionExpandListener(){
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Do something when action item collapses
return true; // Return true to collapse action view
}
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true; // Return true to expand action view
}};
// Assign the listener to that action item
MenuItemCompat.setOnActionExpandListener(share,el);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch(item.getItemId()){
case R.id.playlist:
break;
case blue:
blueTheme.Blue();
break;
case pink:
pinkTheme.Pink();
break;
case R.id.muteoption:
musicPlayer.MuteVolume();
break;
case R.id.unmuteoption:
musicPlayer.UnMuteVolume();
break;
default:
return super.onOptionsItemSelected(item);
// TODO: Implement this method
}
return super.onOptionsItemSelected(item);
}
}
这是主要的活动类
package com.mycompany.myapp;
import android.app.*;
import android.os.*;
import android.widget.Button;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.EditText;
import android.widget.AdapterView;
import android.widget.TextView;
import java.io.*;
import android.content.*;
import android.view.*;
import android.media.*;
import javax.security.auth.*;
import android.util.*;
import android.widget.AdapterView.*;
import java.net.*;
import org.apache.http.util.*;
import android.webkit.*;
import java.text.*;
import android.graphics.*;
import android.widget.TextView.*;
import android.text.*;
import android.widget.ActionMenuView.*;
import android.support.v7.app.*;
import android.support.v7.widget.Toolbar;
import android.support.v7.app.ActionBar;
import android.support.v7.widget.SearchView;
import android.view.MenuItem.*;
import android.support.v7.view.menu.*;
import android.widget.*;
import android.content.Intent;
import android.support.v4.view.*;
import android.support.v7.widget.*;
import android.support.v7.widget.ShareActionProvider;
import android.net.*;
import java.util.*;
import java.nio.channels.*;
import java.nio.*;
public class MainActivity extends AppCompatActivity
{
private MusicPlayer musicPlayer;
private String pos = "";
private FileManager fm;
private BlueTheme BlueTheme;
private PinkTheme PinkTheme;
private Downloader downloader;
private EditTextCustomizable etc;
private OptionsMenu optionsMenu;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar ab = getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(true);
ab.setDisplayShowHomeEnabled(true);
musicPlayer = new MusicPlayer(new MediaPlayer());
fm = new FileManager(this,this);
BlueTheme = new BlueTheme(this,this ,fm);
PinkTheme = new PinkTheme(this,this,fm);
etc = new EditTextCustomizable(this , BlueTheme , PinkTheme);
etc.customize();
optionsMenu = new OptionsMenu(musicPlayer, fm, BlueTheme , PinkTheme);
//here is where I need to call out options menu.what ????? In order for my options menu to show .
fm.ListFiles();
fm.DeleteFiles();
fm.EditFiles();
Button rewind = (Button)findViewById(R.id.rewind);
rewind.setText("<");
Button fwd = (Button)findViewById(R.id.fwd);
fwd.setText(">");
ListView downloadsList = (ListView) findViewById(R.id.downloads);
downloadsList.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3){
ListView downloadsList = (ListView) findViewById(R.id.downloads);
pos = downloadsList.getItemAtPosition(position).toString();
musicPlayer.InitPlay(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath() + "/" + pos);
}});
}
public void Play(View view){
musicPlayer.Play();
EditText search = (EditText)findViewById(R.id.search);
musicPlayer.SearchResult(search.getText().toString());
}
public void Pause(View view){
musicPlayer.Pause();
}
public void Stop(View view){
musicPlayer.Stop();
}
public void Rewind(View view){
musicPlayer.Rewind();
}
public void Fwd(View view){
musicPlayer.Fwd();
}
public void onDownloadClick(View view){
EditText bar = (EditText)findViewById(R.id.search);
String downloadFile = bar.getText().toString();
downloader.DownloadURL(downloadFile);
}
public File writeToExternal(String filename) {
try{
File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString(), filename); //Get file location from external source
InputStream is = new FileInputStream(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() + File.separator + filename); //get file location from internal
OutputStream os = new FileOutputStream(file); //Open your OutputStream and pass in the file you want to write to
byte[] toWrite = new byte[is.available()]; //Init a byte array for handing data transfer
Log.i("Available ", is.available() + "");
int result = is.read(toWrite); //Read the data from the byte array
Log.i("Result", result + "");
os.write(toWrite); //Write it to the output stream
is.close(); //Close it
os.close(); //Close it
return file;
} catch (Exception e) { e.printStackTrace();
//if there's an error, make a piece of toast and serve it up
return null;
}
}
}
上面是OnCreate（）中的代码，我需要实例化或调出OnCreateOptionsMenu ????有办法做到这一点?????我会在那里发表评论，我需要它。