我实现了我的应用程序,它有2个菜单按钮的操作栏:添加和设置。在设计器中查看2个按钮仍然AP preAR像正常的。然而,当我运行的应用程序,2个按钮不显示在所有。请帮忙
下面是我的code:
activity_main.xml
< RelativeLayout的的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools机器人:layout_width =match_parent
机器人:layout_height =match_parent工具:上下文=MainActivity。>
<的ListView
机器人:ID =@机器人:ID /列表
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignParentTop =真
机器人:layout_alignParentBottom =真/>
< / RelativeLayout的>
MainActivity.Java
包com.example.sunny.mynote;
进口android.app.ActionBar;
进口android.app.ListActivity;
进口android.content.Intent;
进口android.support.v7.app.ActionBarActivity;
进口android.os.Bundle;
进口android.view.ContextMenu;
进口android.view.Menu;
进口android.view.MenuInflater;
进口android.view.MenuItem;
进口android.view.View;
进口android.widget.Adapter;
进口android.widget.AdapterView;
进口android.widget.ArrayAdapter;
进口android.widget.ListView;
进口com.example.sunny.mynote.com.example.sunny.mynote.data.NoteDataSource;
进口com.example.sunny.mynote.com.example.sunny.mynote.data.NoteItem;
进口的java.util.List;
公共类MainActivity扩展ListActivity {
公共静态最终诠释EDITOR_ACRIVITY_REQUEST = 1001;
公共静态最终诠释SETTINGS_REQUEST = 1003;
私有静态最终诠释MENU_DELETE_ID = 1002;
私人诠释currentNoteId;
私人NoteDataSource数据源;
名单< NoteItem> notesList;
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
registerForContextMenu(getListView());
数据源=新NoteDataSource(本);
refreshDisplay();
}
私人无效refreshDisplay(){
notesList = datasource.findAll();
ArrayAdapter< NoteItem>适配器=
新的ArrayAdapter< NoteItem>(这一点,R.layout.list_item_layout,notesList);
setListAdapter(适配器);
}
//添加操作的操作栏
@覆盖
公共布尔onCreateOptionsMenu(功能菜单){
//充气操作栏中使用的菜单项
MenuInflater充气= getMenuInflater();
inflater.inflate(R.menu.menu_main,菜单);
返回super.onCreateOptionsMenu(菜单);
}
//响应操作按钮
@覆盖
公共布尔onOptionsItemSelected(菜单项项){
//操作栏上的项目手柄presses
开关(item.getItemId()){
案例R.id.action_create:
createNote();
返回true;
案例R.id.action_settings:
设置();
返回true;
默认:
返回super.onOptionsItemSelected(项目);
}
}
私人无效createNote()
{
NoteItem注= NoteItem.getNew();
意向意图=新的意图(这一点,NoteEditorActivity.class);
intent.putExtra(钥匙,note.getKey());
intent.putExtra(文本,note.getText());
startActivityForResult(意向,EDITOR_ACRIVITY_REQUEST);
}
私人无效设置()
{
意图intent2 =新的意图(这一点,Settings.class);
startActivityForResult(intent2,SETTINGS_REQUEST);
}
@覆盖
保护无效onListItemClick(ListView的L,视图V,INT位置,长的id){
NoteItem注= notesList.get(位置);
意向意图=新的意图(这一点,NoteEditorActivity.class);
intent.putExtra(钥匙,note.getKey());
intent.putExtra(文本,note.getText());
startActivityForResult(意向,EDITOR_ACRIVITY_REQUEST);
}
@覆盖
保护无效onActivityResult(INT申请code,INT结果code,意图数据){
如果(要求code == EDITOR_ACRIVITY_REQUEST和放大器;&安培;结果code == RESULT_OK)
{
overridePendingTransition(R.anim.fadein,R.anim.fadeout);
NoteItem注=新NoteItem();
note.setKey(data.getStringExtra(钥匙));
note.setText(data.getStringExtra(文本));
datasource.update(注);
refreshDisplay();
}
}
@覆盖
公共无效onCreateContextMenu(文本菜单菜单,视图V,ContextMenu.ContextMenuInfo menuInfo){
AdapterView.AdapterContextMenuInfo信息=(AdapterView.AdapterContextMenuInfo)menuInfo;
currentNoteId =(INT)info.id;
menu.add(0,MENU_DELETE_ID,0,删除);
}
@覆盖
公共布尔onContextItemSelected(菜单项项){
如果(item.getItemId()== MENU_DELETE_ID)
{
NoteItem注意= notesList.get(currentNoteId);
datasource.remove(注);
refreshDisplay();
}
返回super.onContextItemSelected(项目);
}
}
menu.xml文件
<菜单的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:程序=http://schemas.android.com/apk/res-auto
的xmlns:工具=http://schemas.android.com/tools工具:上下文=MainActivity。>
<项目机器人:ID =@ + ID / action_create机器人:标题=@字符串/ action_create
机器人:图标=@可绘制/ create_note
机器人:orderInCategory =100的应用程序:showAsAction =ifRoom/>
<项目机器人:ID =@ + ID / action_settings机器人:标题=@字符串/ action_settings
机器人:orderInCategory =100的应用程序:showAsAction =ifRoom安卓图标=@可绘制/ ic_settings/>
< /菜单>
解决方案
加入menu.xml文件应用程序:showAsAction =ifRoom
是这样的:
<菜单的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:程序=http://schemas.android.com/apk/res-auto
的xmlns:工具=http://schemas.android.com/tools工具:上下文=主。>
<项目机器人:ID =@ + ID /粘贴机器人:标题=粘贴
机器人:orderInCategory =100
应用程序:showAsAction =ifRoom/>
< /菜单>
,并在主:
//添加操作的操作栏
@覆盖
公共布尔onCreateOptionsMenu(功能菜单){
//充气操作栏中使用的菜单项
MenuInflater充气= getMenuInflater();
inflater.inflate(R.menu.main_activity_actions,菜单);
返回super.onCreateOptionsMenu(菜单);
}
//响应操作按钮
@覆盖
公共布尔onOptionsItemSelected(菜单项项){
//操作栏上的项目手柄presses
开关(item.getItemId()){
案例R.id.action_search:
OpenSearch的();
返回true;
案例R.id.action_settings:
openSettings();
返回true;
默认:
返回super.onOptionsItemSelected(项目);
}
}
看到这样的: https://开头developer.android.com/training/basics/actionbar/adding-buttons.html
I'm implementing an action bar for my app which has 2 menu buttons : Add and Settings. In Designer view the 2 buttons still apprear like normal. However when I run the app 2 buttons does not show up at all. Please help
Below are my code:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context=".MainActivity">
<ListView
android:id="@android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true" />
</RelativeLayout>
MainActivity.Java
package com.example.sunny.mynote;
import android.app.ActionBar;
import android.app.ListActivity;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.example.sunny.mynote.com.example.sunny.mynote.data.NoteDataSource;
import com.example.sunny.mynote.com.example.sunny.mynote.data.NoteItem;
import java.util.List;
public class MainActivity extends ListActivity {
public static final int EDITOR_ACRIVITY_REQUEST = 1001;
public static final int SETTINGS_REQUEST = 1003;
private static final int MENU_DELETE_ID = 1002;
private int currentNoteId;
private NoteDataSource datasource;
List<NoteItem> notesList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
registerForContextMenu(getListView());
datasource = new NoteDataSource(this);
refreshDisplay();
}
private void refreshDisplay() {
notesList = datasource.findAll();
ArrayAdapter<NoteItem> adapter =
new ArrayAdapter<NoteItem>(this, R.layout.list_item_layout, notesList);
setListAdapter(adapter);
}
//Add the Actions to the Action Bar
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return super.onCreateOptionsMenu(menu);
}
//Respond to Action Buttons
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_create:
createNote();
return true;
case R.id.action_settings:
Settings();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void createNote()
{
NoteItem note = NoteItem.getNew();
Intent intent = new Intent(this, NoteEditorActivity.class);
intent.putExtra("key", note.getKey());
intent.putExtra("text", note.getText());
startActivityForResult(intent, EDITOR_ACRIVITY_REQUEST);
}
private void Settings()
{
Intent intent2 = new Intent(this, Settings.class);
startActivityForResult(intent2, SETTINGS_REQUEST);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
NoteItem note = notesList.get(position);
Intent intent = new Intent(this, NoteEditorActivity.class);
intent.putExtra("key", note.getKey());
intent.putExtra("text", note.getText());
startActivityForResult(intent, EDITOR_ACRIVITY_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == EDITOR_ACRIVITY_REQUEST && resultCode == RESULT_OK)
{
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
NoteItem note = new NoteItem();
note.setKey(data.getStringExtra("key"));
note.setText(data.getStringExtra("text"));
datasource.update(note);
refreshDisplay();
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
currentNoteId = (int)info.id;
menu.add(0, MENU_DELETE_ID, 0, "Delete");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
if (item.getItemId() == MENU_DELETE_ID)
{
NoteItem note = notesList.get(currentNoteId);
datasource.remove(note);
refreshDisplay();
}
return super.onContextItemSelected(item);
}
}
menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">
<item android:id="@+id/action_create" android:title="@string/action_create"
android:icon="@drawable/create_note"
android:orderInCategory="100" app:showAsAction="ifRoom" />
<item android:id="@+id/action_settings" android:title="@string/action_settings"
android:orderInCategory="100" app:showAsAction="ifRoom" android:icon="@drawable/ic_settings"/>
</menu>
解决方案
add in menu.xml app:showAsAction="ifRoom"
like this:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" tools:context=".Main">
<item android:id="@+id/paste" android:title="Paste"
android:orderInCategory="100"
app:showAsAction="ifRoom" />
</menu>
and in main:
//Add the Actions to the Action Bar
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}
//Respond to Action Buttons
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_search:
openSearch();
return true;
case R.id.action_settings:
openSettings();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
see this: https://developer.android.com/training/basics/actionbar/adding-buttons.html