更换 actionBar 的 icon

actionbar.java

<activity
            android:name="com.ilegendsoft.toprankapps.tubeplayer.activities.PlayVideoActivity"
            android:configChanges="orientation|screenSize"
            android:launchMode="singleTop"
            android:logo="@drawable/play_video_back" >
        </activity>
        
        
<?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:drawable="@drawable/btn_actionbar_player_back"
        android:left="12dp"/>

</layer-list>

```java
ActionBar actionBar = getSupportActionBar();
		//actionBar.setDisplayShowHomeEnabled(false);
        actionBar.setDisplayShowTitleEnabled(false);
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeAsUpIndicator(android.R.color.transparent);
		init(getIntent());
```