Menu in Android

In Android, menus can be divided into options menu (generated by the menu key) and context menu (generated by pressing the screen for a long time)

The following is an example;

1, Options menu (generated by the menu key ),

@Overridepublic boolean onCreateOptionsMenu(Menu menu) {m=menu;menu.add(0, Menu.FIRST, 0, "1st");menu.add(0, Menu.FIRST+1, 0, "2st");menu.add(0, Menu.FIRST+2, 0, "3st");menu.add(0, Menu.FIRST+3, 0, "4st");return super.onCreateOptionsMenu(menu);}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {  case 1:Toast.makeText(this, "you select"+item.getItemId(), 500).show();break;case 2:Toast.makeText(this, "you select"+item.getItemId(), 500).show();break;case 3:Toast.makeText(this, "you select"+item.getItemId(), 500).show();break;case 4:Toast.makeText(this, "you select"+item.getItemId(), 500).show();break;}return super.onOptionsItemSelected(item);}

Note: The public Boolean oncreateoptionsmenu (menu) method is called only once by the system. To change the menu content dynamically, You need to rewrite the onprepareoptionsmenu (menu) method.

Menu m=null;int count=0; @Overridepublic boolean onPrepareOptionsMenu(Menu menu) {if(count>0){if(count%2==0){menu.removeGroup(1);}else{menu.add(1, Menu.FIRST, 0, "5st");menu.add(1, Menu.FIRST+1, 0, "6st");}}count++;return super.onPrepareOptionsMenu(menu);}

2. Context menu (long-pressed screen)

@Overridepublic boolean onContextItemSelected(MenuItem item) {    switch (item.getItemId()) {      case 1:Toast.makeText(this, "you select"+item.getItemId(), 500).show();break;case 2:Toast.makeText(this, "you select"+item.getItemId(), 500).show();break;    }return super.onContextItemSelected(item);}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {menu.add(0, Menu.FIRST, 0, "1st");menu.add(0, Menu.FIRST+1, 0, "2st");super.onCreateContextMenu(menu, v, menuInfo);}

Another step is to bind the view;

/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);     //   setContentView(R.layout.main);        MyView my=new MyView(this);        setContentView(my);        registerForContextMenu(my);    }

The above is implemented through code and can also be implemented through XML files

The menu. XML content is as follows;

<menu xmlns:android="http://schemas.android.com/apk/res/android">       <item android:id="@+id/fourth_item"        android:orderInCategory="3"        android:title="Fourth" />    <item android:id="@+id/third_item"        android:orderInCategory="2"        android:title="Third" />    <item android:id="@+id/dive"        android:orderInCategory="1"        android:title="Second" />    <item android:id="@+id/jump"        android:orderInCategory="0"        android:title="First" /></menu>

Load XML files;

@Override    public boolean onCreateOptionsMenu(Menu menu) {               // Inflate the currently selected menu XML resource.        MenuInflater inflater = getMenuInflater();        inflater.inflate(sMenuExampleResources[R.m], menu);                        return true;    } @Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()) {                                          case R.id.jump:                Toast.makeText(this, "Jump up in the air!", Toast.LENGTH_SHORT).show();                return true;            case R.id.dive:                Toast.makeText(this, "Dive into the water!", Toast.LENGTH_SHORT).show();return false;}               

OK, all done, huh, huh...