6. ActionBar详解

ActionBar简介

 隐藏和显示ActionBar

隐藏ActionBar      getActionBar().hide(); 

显示ActionBar      getActionBar().show(); 

 添加和响应Action按钮

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <Button
        android:id="@+id/button_hide_show_actionbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick_HideShowActionBar"
        android:text="隐藏ActionBar" />
</LinearLayout>

package cn.eoe.first.actionbar;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;

public class FirstActionBarActivity extends Activity {
    private Button hideShowActionBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
        setContentView(R.layout.activity_first_action_bar);
        hideShowActionBar = (Button) findViewById(R.id.button_hide_show_actionbar);
    }

    public void onClick_HideShowActionBar(View view) {
        if (getActionBar() == null)
            return;
        if (getActionBar().isShowing()) {
            getActionBar().hide();
            hideShowActionBar.setText("显示ActionBar");
        } else {
            getActionBar().show();
            hideShowActionBar.setText("隐藏ActionBar");
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.activity_first_action_bar, menu);
        // menu.getItem(2).setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Toast.makeText(this, item.getTitle(), Toast.LENGTH_LONG).show();
        return super.onOptionsItemSelected(item);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_save"
        android:icon="@drawable/save"
        android:showAsAction="ifRoom|withText"
        android:title="保存"/>
    <item
        android:id="@+id/menu_open"
        android:icon="@drawable/open"
        android:showAsAction="ifRoom"
        android:title="打开"/>
    <item
        android:id="@+id/menu_search"
        android:icon="@drawable/search"
        android:showAsAction="always"
        android:title="保存"/>
    <item
        android:id="@+id/menu1"
        android:icon="@drawable/ic_launcher"
        android:showAsAction="ifRoom"
        android:title="菜单项1"/>
    <item
        android:id="@+id/menu2"
        android:icon="@drawable/ic_launcher"
        android:showAsAction="ifRoom"
        android:title="菜单项2"/>
   
</menu>

 可上下两分的Action

package cn.eoe.split.actionbar;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuInflater;

public class SplitActionBar extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_split_action_bar);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.activity_split_action_bar, menu);
        return true;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_save"
        android:icon="@drawable/open"
        android:showAsAction="always|withText"/>
    <item
        android:id="@+id/menu_open"
        android:icon="@drawable/open"
        android:showAsAction="always"
        android:title="打开"/>
    <item
        android:id="@+id/menu_search"
        android:icon="@drawable/search"
        android:showAsAction="always"
        android:title="保存"/>
    <item
        android:id="@+id/menu1"
        android:icon="@drawable/ic_launcher"
        android:showAsAction="always"
        android:title="菜单项1"/>
    <item
        android:id="@+id/menu2"
        android:icon="@drawable/ic_launcher"
        android:showAsAction="always"
        android:title="菜单项2"/>

</menu>

 收缩和展开Action View 

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnActionExpandListener;
import android.widget.Toast;

@SuppressLint("NewApi")
public class ActionViewActivity extends Activity implements
        OnActionExpandListener {
    // private Menu menu;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_action_view);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_action_view, menu);
        // this.menu = menu;
        for (int i = 0; i < menu.size(); i++) {
            menu.getItem(i).setOnActionExpandListener(this);
        }
        return true;
    }

    @Override
    public boolean onMenuItemActionExpand(MenuItem item) {
        Toast.makeText(this, "<" + item.getTitle() + ">已经展开", Toast.LENGTH_LONG)
                .show();

        return true;
    }

    @Override
    public boolean onMenuItemActionCollapse(MenuItem item) {
        Toast.makeText(this, "<" + item.getTitle() + ">已经收缩", Toast.LENGTH_LONG)
                .show();
        return true;
    }

}

res/menu/activity_action_view.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_item_edit"
        android:actionViewClass="android.widget.EditText"
        android:showAsAction="always"
        android:title="编辑"/>
    <item
        android:id="@+id/menu_item_clock"
        android:actionLayout="@layout/action_view_clock"
        android:icon="@drawable/time"
     
        android:showAsAction="always|collapseActionView"
        android:title="时间"/>
    <item
        android:id="@+id/menu_item_search"
        android:actionViewClass="android.widget.SearchView"
        android:icon="@drawable/search"
        android:showAsAction="always|collapseActionView"
        android:title="搜素"/>

</menu>