Android Targetsdk23カスタムボタンでメニューを開くにはどうすればよいですか？

Question

Googleがメニューボタンをキャンセルした後、一部の携帯電話がボタンを持っていない、私はまだ以下のコードを使用してメニューを開くことができない、私は何を間違えた？

code: 
    public void menu(View v) 
    { 
     KeyEvent event=new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MENU); 
     MainActivity.this.dispatchKeyEvent(event); 
    } 
and the gradle: 
minSdkVersion 18 
targetSdkVersion 23 
i also tried : 
myActivity.this.openOptionsMenu(); 

主な活動コード：

public class MainActivity extends AppCompatActivity { 

     private int openfileDialogId = 0; 
     private Button offline_button = null; 
     private statisticShow ss; 
     private String filepath; 
     private xlsAndXlsxInput input; 
     private final static int ItemIndex = Menu.FIRST+1; 
     private Button menu; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      //  requestWindowFeature(Window.FEATURE_NO_TITLE); 
      setContentView(R.layout.activity_main); 
      offline_button = (Button) findViewById(R.id.offline_button); 
      menu = (Button)findViewById(R.id.menubutton); 
      menu.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        openOptionsMenu(); 
       } 
      }); 
      getSupportActionBar().hide(); 
      SpeechUtility.createUtility(MyApplication.getMyContext(), SpeechConstant.APPID+"=5715fff3"); 
     } 

     public void toOffline(View v) { 
      final EditText et = new EditText(this); 
      et.setBackgroundColor(Color.WHITE); 
      et.setHint("please input the number"); 
      et.setHintTextColor(Color.GRAY); 
      new AlertDialog.Builder(this) 
        .setView(et) 
        .setPositiveButton("sure", new DialogInterface.OnClickListener() { 
       @Override 
       public void onClick(DialogInterface dialog, int which) { 

        Intent tooffline = new Intent(MainActivity.this, OfflineActivity.class); 
        tooffline.putExtra("classname", et.getText().toString()); 
        startActivity(tooffline); 
       } 

      }) 
        .setNegativeButton("cancel", null) 
        .show(); 

     } 

     public void toOnline(View v) { 
      Intent online = new Intent(this, OnlineActivity.class); 
      startActivity(online); 
     } 

     public void createExcel(View v) { 
      Intent create = new Intent(this, AddStudent.class); 
      startActivity(create); 
     } 

     public void imports(View v) { 
      showDialog(openfileDialogId); 
     } 

     @Override 
     protected Dialog onCreateDialog(int id) { 
      if (id == openfileDialogId) { 
       Map<String, Integer> images = new HashMap<String, Integer>(); 
       images.put(OpenFileDialog.sRoot, R.drawable.filedialog_root);  
       images.put(OpenFileDialog.sParent, R.drawable.filedialog_folder_up);  
       images.put(OpenFileDialog.sFolder, R.drawable.filedialog_folder); 
       images.put("xls", R.drawable.filedialog_xlsfile); 
       images.put(OpenFileDialog.sEmpty, R.drawable.filedialog_root); 
       Dialog dialog = OpenFileDialog.createDialog(id, this, "open the files", new CallbackBundle() { 
          @Override 
          public void callback(Bundle bundle) { 
           filepath = bundle.getString("path"); 
           input = new xlsAndXlsxInput(new File("mnt" + File.separator + filepath)); 
          } 
         }, 
         ".xls;", 
         images); 
       return dialog; 
      } 
      return null; 
     } 

     @Override 
     public boolean onCreateOptionsMenu(Menu menu) { 
      menu.add(0,ItemIndex,0,"imformations"); 
      menu.add(0,ItemIndex+1,0,"about"); 
      menu.add(0,ItemIndex+2,0,"help"); 
      return true; 
     } 

     @Override 
     public boolean onOptionsItemSelected(MenuItem item) 
     { 
      switch(item.getItemId()) 
      { 
       case ItemIndex: 
        final EditText et = new EditText(this); 
        new AlertDialog.Builder(this) 
          .setTitle("please input the number") 
          .setView(et) 
          .setPositiveButton("sure", new DialogInterface.OnClickListener() { 
           @Override 
           public void onClick(DialogInterface dialog, int which) { 
             Intent list = new Intent(MainActivity.this, ListActivity.class); 
             list.putExtra("classname",et.getText().toString()); 
             startActivity(list); 

           } 
          }) 
          .setNegativeButton("cancel", null) 
          .show(); 
        break; 
       case ItemIndex+1: 
        Intent about = new Intent(MainActivity.this, ShowActivity.class); 
        startActivity(about); 
        break; 
       case ItemIndex+2: 
        Intent help = new Intent(MainActivity.this, HelpActivity.class); 
        startActivity(help); 
        break; 
      } 
      return super.onOptionsItemSelected(item); 
     } 
} 

Answer 1

この

yourbutton.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
    openOptionsMenu(); 
} 
});