12/30/2010 geek日志@Android

1. 发现那个professional里面写menu的时候用的是java写的 而不是XML hello里虽然用XML写的 但是1很少2只有optionsmenu 于是我用professional的code修改了menu部分 改成了XML格式的menu 一切都好 但是只是menu.setTitle这个方法不知道如何在menu的XML里面做 把code粘在下面 有兴趣的同学可以看一看

 

其实需要改动的部分主要就是两个 一个是要用MenuInflater 来从XML中调取出来这个Menu 第二个是修改switch语句中的case

需要改动的程序:

1). onCreateOptionsMenu()

@Overridepublic boolean onCreateOptionsMenu(Menu menu) {super.onCreateOptionsMenu(menu);MenuInflater mi = getMenuInflater();mi.inflate(R.menu.menu, menu);/*// draw UI in activity !!!!I don't like it //Create and add new menu items.MenuItem itemAdd = menu.add(0, ADD_NEW_TODO, Menu.NONE, R.string.add_new);MenuItem itemRem = menu.add(0, REMOVE_TODO, Menu.NONE, R.string.remove);//Assign iconsitemAdd.setIcon(R.drawable.add_new_item);itemRem.setIcon(R.drawable.remove_item);//Allocate shortcuts to each of them.itemAdd.setShortcut('0', 'a');itemRem.setShortcut('1', 'r');*/return true;

 

2). onOptionsItemsSelected()

@Overridepublic boolean onOptionsItemSelected(MenuItem item) {super.onOptionsItemSelected(item);int index = itemsView.getSelectedItemPosition();switch (item.getItemId()) {//case REMOVE_TODO :case R.id.remove_item :if (addingNew) {cancelAdd();}else {removeItem(index);}return true;//case ADD_NEW_TODO :case R.id.add_new_item :addNewItem();return true;}return false;}

3). onPrepareOptionsMenu()

@Overridepublic boolean onPrepareOptionsMenu(Menu menu) {super.onPrepareOptionsMenu(menu);int index = itemsView.getSelectedItemPosition();String removeTitle = getString(addingNew ? R.string.cancel : R.string.remove);Log.d(TAG, ""+addingNew);//MenuItem removeItem = menu.findItem(REMOVE_TODO);MenuItem removeItem = menu.findItem(R.id.remove_item);Log.d(TAG, ""+removeItem.getItemId());removeItem.setTitle(removeTitle);removeItem.setVisible(addingNew || index > -1);return true;}

4). onCreateContextMenu()

@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {super.onCreateContextMenu(menu, v, menuInfo);MenuInflater mi = getMenuInflater();mi.inflate(R.menu.context_menu, menu);/*menu.setHeaderTitle("Selected To Do Item");menu.add(0, REMOVE_TODO, Menu.NONE, R.string.remove);*/}

5). onContextItemsSelected()

@Overridepublic boolean onContextItemSelected(MenuItem item) {super.onContextItemSelected(item);switch (item.getItemId()) {case R.id.remove_item :AdapterView.AdapterContextMenuInfo menuInfo = (AdapterView.AdapterContextMenuInfo)item.getMenuInfo();int index = menuInfo.position;removeItem(index);return true;}return false;}

 

下面我们需要添加两个XML文件 我新建了res/menu这个文件夹 然后添加了menu.xml和context_menu.xml两个文件

6). menu.xml

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/add_new_item" android:title="@string/add_new" android:alphabeticShortcut="@string/add_new_shortcut" android:icon="@drawable/add_new_item"/> <item android:id="@+id/remove_item" android:title="@string/remove" android:alphabeticShortcut="@string/remove_shortcut" android:icon="@drawable/remove_item"/></menu>

7). context_menu.xml

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/remove_item" android:title="@string/remove"/></menu>

 

最后我们还需要添加一些string在res/strings.xml里

8) strings.xml

<?xml version="1.0" encoding="utf-8"?><resources> <string name="new_item_label">To Add New Item</string> <string name="app_name">To-do List</string> <string name="add_new">Add New Item</string> <string name="remove">Remove Item</string> <string name="cancel">Cancel</string> <string name="add_new_shortcut">0</string> <string name="remove_shortcut">1</string></resources>