requestWindowFeature详解

迈不过友情╰ 2022-03-27 12:42 184阅读 0赞

android开发中经常会在setContentView(R.layout.XXX); 前设置requestWindowFeature(XXXX)。

他的意思是**需要软件全屏显示、自定义标题（使用按钮等控件）和其他的需求**

**首先介绍一个重要方法那就是requestWindowFeature(featrueId),它的功能是启用窗体的扩展特性。参数是Window类中定义的常量。**

**一、枚举常量**

1.DEFAULT\_FEATURES：系统默认状态，一般不需要指定

2.FEATURE\_CONTEXT\_MENU：启用ContextMenu，默认该项已启用，一般无需指定

3.FEATURE\_CUSTOM\_TITLE：自定义标题。当需要自定义标题时必须指定。如：标题是一个按钮时

4.FEATURE\_INDETERMINATE\_PROGRESS：不确定的进度

5.FEATURE\_LEFT\_ICON：标题栏左侧的图标

6.FEATURE\_NO\_TITLE：没有标题

7.FEATURE\_OPTIONS\_PANEL：启用“选项面板”功能，默认已启用。

8.FEATURE\_PROGRESS：进度指示器功能

9.FEATURE\_RIGHT\_ICON:标题栏右侧的图标

**二、详解**

默认显示状态

![fa6141f6-aac0-3159-8d11-c0b9ced77093.jpg][]

**1.FEATURE\_CUSTOM\_TITLE详解**

this.requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);  
    setContentView(R.layout.main);

这是因为没有设置Featrue
    
    在上面代码后加：getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title);
    
     
    
    
    自定义标题完成，它是一个xml文件布局

<?xml version="1.0" encoding="utf-8"?>  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content" >  
      
        <ImageView  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:src="@drawable/ic_launcher"  
            />  
      
        <TextView  
            android:id="@+id/text"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:layout_alignParentLeft="true"  
            android:textColor="#000000"  
            android:text="FEATURE_CUSTOM_TITLE" />  
      
    </LinearLayout>

**2.FEATURE\_INDETERMINATE\_PROGRESS详解**

可以用来表示一个进程正在运行

this.requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);  
    setContentView(R.layout.main);  
    getWindow().setFeatureInt(Window.FEATURE_INDETERMINATE_PROGRESS, R.layout.progress);  
    setProgressBarIndeterminateVisibility(true);

![d8a306fe-91f1-377a-93c8-ae1c295053eb.jpg][]

<?xml version="1.0" encoding="utf-8"?>  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content" >  
      
        <ProgressBar  
            android:id="@+id/progress"  
            style="?android:attr/progressBarStyleSmallTitle"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:layout_gravity="center_vertical" >  
        </ProgressBar>  
      
    </LinearLayout>

3.FEATURE\_LEFT\_ICON和 **FEATURE\_RIGHT\_ICON** 详解

requestWindowFeature(Window.FEATURE_RIGHT_ICON);  
    setContentView(R.layout.main);      
    getWindow().setFeatureDrawableResource(Window.FEATURE_RIGHT_ICON,R.drawable.ic_launcher);

requestWindowFeature(Window.FEATURE_LEFT_ICON);  
    setContentView(R.layout.main);          
    getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,R.drawable.ic_launcher);

![59916459-70e1-302e-9b4c-36e4cb549d3f.jpg][]

![ea603294-3605-3c02-a968-4884a315decd.jpg][]

** 4.FEATURE\_NO\_TITLE详解**

this.requestWindowFeature(Window.FEATURE_NO_TITLE);  
    setContentView(R.layout.main);

![75276a27-52c5-3327-abdb-dfb425c9a2c1.jpg][]

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

![087a5675-c936-32b4-9602-d56d1b15d697.jpg][]

** **

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[d8a306fe-91f1-377a-93c8-ae1c295053eb.jpg]: /images/20220327/008b784c21f0461dadb63e6614fde7a3.png
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[ea603294-3605-3c02-a968-4884a315decd.jpg]: /images/20220327/a00685413f404e2db8b64d996b20e3c7.png
[75276a27-52c5-3327-abdb-dfb425c9a2c1.jpg]: /images/20220327/36a7700a4dc74500b4d7d546bfc95619.png
[087a5675-c936-32b4-9602-d56d1b15d697.jpg]: /images/20220327/b4ff136b16ea4db39d2890fd1d9cada7.png