安卓学习-界面-ui-菜单ActionBar

什么是actionbar

如下图这个就是

1.actionbar里添加按钮，通过代码添加

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //设置菜单
        MenuItem item1=menu.add(0, 0, 1, "添加");
        MenuItem item2=menu.add(0, 0, 3, "删除");
        MenuItem item3=menu.add(0, 0, 2, "修改");
        //绑定到actionbar
        item1.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
        item2.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
        item3.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
                
        return super.onCreateOptionsMenu(menu);
    }

    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        Toast.makeText(MainActivity.this, item.getTitle(), Toast.LENGTH_SHORT).show();
        
        return super.onMenuItemSelected(featureId, item);
    }
    
    
}

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2.通过xml配置文件添加

主要是item后面要添加 android:showAsAction="always"，否则显示的是菜单，不是按钮

没添加的效果

添加后效果

若是在按钮太多显示不下，则可以添加android:showAsAction="collapseActionView"，效果如下

menu1.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:id="@+id/item1" android:orderInCategory="1" android:title="添加" android:showAsAction="always"/>
    <item android:id="@+id/item2" android:orderInCategory="3" android:title="删除" android:showAsAction="always"/>
    <item android:id="@+id/item3" android:orderInCategory="2" android:title="修改" android:showAsAction="always"/>
</menu>

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MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater=getMenuInflater();
        inflater.inflate(R.menu.menu1, menu);
                
        return super.onCreateOptionsMenu(menu);
    }

    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        Toast.makeText(MainActivity.this, item.getTitle(), Toast.LENGTH_SHORT).show();
        
        return super.onMenuItemSelected(featureId, item);
    }
}

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3.甚至actionbar为tabs

Tab1Fragment.java

public class Tab1Fragment extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        
        return inflater.inflate(R.layout.tab1, container, false);
    }
    
}

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tab1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

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还有2个tab，反正也一样

MainActivity.java

public class MainActivity extends Activity {

    ActionBar bar;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        bar=getActionBar();
        //bar.hide();
        
        bar.setDisplayShowTitleEnabled(false);
         bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        
        ActionBar.Tab tab1=bar.newTab().setText("页面1");
        ActionBar.Tab tab2=bar.newTab().setText("页面2");
        ActionBar.Tab tab3=bar.newTab().setText("页面3");

        Fragment fragment1 = new Tab1Fragment();
        tab1.setTabListener(new MyTabsListener(fragment1));
        bar.addTab(tab1);
        
        Fragment fragment2 = new Tab2Fragment();
        tab2.setTabListener(new MyTabsListener(fragment2));
        bar.addTab(tab2);
        
        Fragment fragment3 = new Tab3Fragment();
        tab3.setTabListener(new MyTabsListener(fragment3));
        bar.addTab(tab3);
    }
    
    public class  MyTabsListener implements ActionBar.TabListener{

        private Fragment fragment;
        
         public MyTabsListener(Fragment fragment)
            {
                this.fragment = fragment;
            }
        
        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            // TODO 自动生成的方法存根
            ft.add(R.id.layout1, fragment, null);
            
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
             ft.remove(fragment);
            
            
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
            // TODO 自动生成的方法存根
            
        }
        
        
    }
    
}

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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="${relativePackage}.${activityClass}" >

    <LinearLayout
        android:id="@+id/layout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

    </LinearLayout>

</RelativeLayout>

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4.ActionBar 显示为list

tabs页面参照上面

activity_main.java

public class MainActivity extends Activity {

    ActionBar bar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        bar=getActionBar();
        //bar.hide();
        
        bar.setDisplayShowTitleEnabled(false);
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

        ArrayAdapter<String> adapter=new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1,
                android.R.id.text1, new String[]{"页面1","页面2","页面3"});
        
        bar.setListNavigationCallbacks(adapter,new OnNavigationListener() {
            @Override
            public boolean onNavigationItemSelected(int itemPosition, long itemId) {
                
                Fragment fragment=null;
                if(itemPosition==0){
                    fragment = new Tab1Fragment();
                }else if (itemPosition==1){
                    fragment = new Tab2Fragment();
                }else if (itemPosition==2){
                    fragment = new Tab3Fragment();
                }
                
                FragmentTransaction tr=getFragmentManager().beginTransaction();
                tr.replace(R.id.layout1, fragment);
                tr.commit();
                
                return true;
            }
        });
    }
}

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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="${relativePackage}.${activityClass}" >

    <LinearLayout
        android:id="@+id/layout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

    </LinearLayout>

</RelativeLayout>

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