一、隐藏标题栏
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复制代码代码如下:
//隐藏标题栏
this.requestwindowfeature(window.feature_no_title);
二、隐藏状态栏
复制代码代码如下:
//隐藏状态栏
this.getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,
windowmanager.layoutparams.flag_fullscreen);
三、去掉所有activity界面的标题栏
修改androidmanifest.xml
在application
标签中添加android:theme="@android:style/theme.notitlebar"
四、去掉所有activity界面的titlebar
和statusbar
修改androidmanifest.xml
在application
标签中添加
android:theme="@android:style/theme.notitlebar.fullscreen"
[img]先看一下默认的情况：
蓝色一行是自定义的导航栏，
黑色的是自带的 ActionBar ，也就是我们说的标题栏。
首先一般都会选择去掉 ActionBar：
隐藏 actionbar 有很多种方法
这种方法是全局中隐藏了标题栏。
其实在我的手机更新系统之前，隐藏了 ActionBar 后，状态栏和自定义的导航栏颜色是相匹配的，不知道什么原因现在默认为灰色了。
上面使用的主题虽然隐藏了标题栏，但是和我们自定义的导航栏不搭，
这时候我们可以选择用自定义的主题(Theme)，来改变状态栏：
在 values 下的 style.xml 中添加
或者在 onCreate 中：
上面两行一般不一起设置，二选一即可。
第一行设置导航栏为透明，第二行将导航栏隐藏。
不推荐第二种做法，如果一个 Activity 中设置了隐藏导航栏而另一个 Activity 没有，那两者切换的时候会不好看。
融合的效果：
状态栏和 app 顶部相融合了，如果标题栏是一张图片效果会更好。
这里还有一个问题，状态栏的文字和我们导航栏的文字重叠了，
我们可以选择在布局文件的根元素中添加：
让布局为状态栏留出空间，就不会出现上面这张被状态栏遮挡的情况。
如果像上面的例子是一样的纯色的标题栏，我们可以选择直接改变状态栏的颜色解决问题。
或者：
不显示时间、电量等信息和文字：
同要可以用修改 Theme 来实现：
或者在 OnCreat() 中加入，还是要注意加在 setContentView() 的前面
如果想让图片全屏要注意设置为：
Android 完全隐藏状态栏方法
1. 隐藏ActionBar：
ActionBar actionBar = getActionBar();
if (actionBar != null) {
actionBar.hide();
}
如果是继承AppCompatActivity，就用getSupportActionBar()。
2. 隐藏状态栏
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
通过这两个步就可以全屏显示启动页了。
然而，当开始动态申请权限，弹出系统的权限提示对话框后，状态栏又重新露出来了。我日，不是隐藏了吗？怎么又出来了，什么鬼？
通过查看源码的解释：
/**
* Request that the visibility of the status bar or other screen/window
* decorations be changed.
*
* pThis method is used to put the over device UI into temporary modes
* where the user's attention is focused more on the application content,
* by dimming or hiding surrounding system affordances. This is typically
* used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY
* Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content
* to be placed behind the action bar (and with these flags other system
* affordances) so that smooth transitions between hiding and showing them
* can be done.
*
* pTwo representative examples of the use of system UI visibility is
* implementing a content browsing application (like a magazine reader)
* and a video playing application.
*
* pThe first code shows a typical implementation of a View in a content
* browsing application. In this implementation, the application goes
* into a content-oriented mode by hiding the status bar and action bar,
* and putting the navigation elements into lights out mode. The user can
* then interact with content while in this mode. Such an application should
* provide an easy way for the user to toggle out of the mode (such as to
* check information in the status bar or access notifications). In the
* implementation here, this is done simply by tapping on the content.
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java
* content}
*
* pThis second code sample shows a typical implementation of a View
* in a video playing application. In this situation, while the video is
* playing the application would like to go into a complete full-screen mode,
* to use as much of the display as possible for the video. When in this state
* the user can not interact with the application; the system intercepts
* touching on the screen to pop the UI out of full screen mode. See
* {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code.
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java
* content}
*
* @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
* {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
* {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
* and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
*/
从释义上可以知道，setSystemUiVisibility()是用于使系统UI进入一种临时的模式，目的是使用户的注意力关注于应用程序的内容上。所以单独一个Activity这样设置是可以全屏显示的，这个只对当前的Activity有效。可是当申请系统权限使，弹出的对话框是系统的Activity，通过adb shell dumpsys activity 来看，当前最顶端的Activity已经是GrantPermissionsActivity。
Run #2: ActivityRecord{2b99111 u0 com.google.android.packageinstaller/com.android.packageinstaller.permission.ui.GrantPermissionsActivity t141}
而这个GrantPermissionsActivity，我们并无法去设置它的setSystemUiVisibility()。所以这种方法不奏效。
通过和同事讨论，后来找到一种方法，可以实现我们的需求。
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
这种方法是OK的。
它的源码释义是：
/**
* Set the flags of the window, as per the
* {@link WindowManager.LayoutParams WindowManager.LayoutParams}
* flags.
*
* pNote that some flags must be set before the window decoration is
* created (by the first call to
* {@link #setContentView(View, android.view.ViewGroup.LayoutParams)} or
* {@link #getDecorView()}:
* {@link WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN} and
* {@link WindowManager.LayoutParams#FLAG_LAYOUT_INSET_DECOR}. These
* will be set for you based on the {@link android.R.attr#windowIsFloating}
* attribute.
*
* @param flags The new window flags (see WindowManager.LayoutParams).
* @param mask Which of the window flag bits to modify.
* @see #addFlags
* @see #clearFlags
*/
public void setFlags(int flags, int mask) {}
仔细分析发现，这个是设置整个当前Window的，而setSystemUiVisibility()聚焦于显示Activity内容的，还是有差别的。
/**
* Window flag: hide all screen decorations (such as the status bar) while
* this window is displayed. This allows the window to use the entire
* display space for itself -- the status bar will be hidden when
* an app window with this flag set is on the top layer. A fullscreen window
* will ignore a value of {@link #SOFT_INPUT_ADJUST_RESIZE} for the window's
* {@link #softInputMode} field; the window will stay fullscreen
* and will not resize.
*
* pThis flag can be controlled in your theme through the
* {@link android.R.attr#windowFullscreen} attribute; this attribute
* is automatically set for you in the standard fullscreen themes
* such as {@link android.R.style#Theme_NoTitleBar_Fullscreen},
* {@link android.R.style#Theme_Black_NoTitleBar_Fullscreen},
* {@link android.R.style#Theme_Light_NoTitleBar_Fullscreen},
* {@link android.R.style#Theme_Holo_NoActionBar_Fullscreen},
* {@link android.R.style#Theme_Holo_Light_NoActionBar_Fullscreen},
* {@link android.R.style#Theme_DeviceDefault_NoActionBar_Fullscreen}, and
* {@link android.R.style#Theme_DeviceDefault_Light_NoActionBar_Fullscreen}./p
*/
public static final int FLAG_FULLSCREEN = 0x00000400;
从释义上得知，设置这个flag可以隐藏所有的屏幕修饰，像status bar，用于Window使用整个显示屏。这个完全是我们的目的了。
