Android ActionBar 初探，androidactionbar

Android ActionBar 初探，androidactionbar

1.指南，例子，個人感覺

首先上官網指南連結http://developer.android.com/guide/topics/ui/actionbar.html

參考了官網上的例子http://developer.android.com/samples/ActionBarCompat-Basic/index.html

初看指南感覺ActionBar 的作用類似於web 開發中常用的include heder.html ,如cnblog 頁面總第一行 。

 

2.相容問題： sdk 11及11以上 可以直接使用，sdk 11以下則需要support-v7

PS:使用這兩種在設定檔裡也要區別如下 ,注意下面#後面是使用sdk 11內建的ActionBar 配置

<menu xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:support="http://schemas.android.com/apk/res-auto"# xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    tools:context="com.example.actionbar.MainActivity" >    <item        android:id="@+id/action_settings"        android:orderInCategory="100"        android:title="@string/action_settings"        support:showAsAction="never"        #app:showAsAction="never"/>        <item        android:id="@+id/menu_refresh"        android:icon="@drawable/ic_action_refresh"        android:title="@string/menu_refresh"        support:showAsAction="ifRoom"        />        

 

3.構造方法

 有設定檔，和程式碼裡構建兩種

    @Override    public boolean onCreateOptionsMenu(Menu menu) {
　　　  　設定檔構建        getMenuInflater().inflate(R.menu.main, menu);        MenuItem locationItem = menu.add(0,R.id.menu_location,0,R.string.menu_location);

        程式構建        locationItem.setIcon(R.drawable.ic_action_location);        MenuItemCompat.setShowAsAction(locationItem, MenuItem.SHOW_AS_ACTION_IF_ROOM);        return true;    }

 

4.全代碼

package com.example.actionbar;import android.annotation.SuppressLint;import android.annotation.TargetApi;import android.os.Build;import android.os.Bundle;import android.support.v4.view.MenuItemCompat;import android.support.v7.app.ActionBar;import android.support.v7.app.ActionBarActivity;import android.view.Menu;import android.view.MenuItem;//@SuppressLint("NewApi")public class MainActivity extends ActionBarActivity {        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.sample_main);   // android.app.ActionBar actionBar =  getActionBar();    //actionBar.hide();    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        MenuItem locationItem = menu.add(0,R.id.menu_location,0,R.string.menu_location);        locationItem.setIcon(R.drawable.ic_action_location);        MenuItemCompat.setShowAsAction(locationItem, MenuItem.SHOW_AS_ACTION_IF_ROOM);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        switch (item.getItemId()) {        case R.id.menu_refresh:            // Here we might start a background refresh task            return true;        case R.id.menu_location:            // Here we might call LocationManager.requestLocationUpdates()            return true;        case R.id.menu_settings:            // Here we would open up our settings activity            return true;        case R.id.action_settings:            // Here we would open up our settings activity            return true;    }        return super.onOptionsItemSelected(item);    }}

5.後續.....