切换全屏模式

Question

我需要一些帮助来切换全屏模式。我在首选项屏幕中设置了全屏。在我的主要活动的我的onResume有：

if(mFullscreen == true) { 
       getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
       getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN); 

      } else 
      { 
       getWindow().addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN); 
       getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 

      } 

但是，这似乎并没有工作，因为它需要setContentView权之前叫什么名字？

......而且，我有requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView前，它带走的标题和状态栏...任何人能提供一些帮助？

---编辑--- 好吧，我有一个错误，导致这不起作用。所以它确实如此。现在，我只需要知道如何切换标题栏。

Answer 1

private void setFullscreen(boolean fullscreen) 
{ 
    WindowManager.LayoutParams attrs = getWindow().getAttributes(); 
    if (fullscreen) 
    { 
     attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN; 
    } 
    else 
    { 
     attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN; 
    } 
    getWindow().setAttributes(attrs); 
} 

Answer 2

我的解决方案结合了答案：

• cprcrack的回答这个问题
• Holoeverywhere : how to programmatically remove at runtime the action bar from an activity
• Android: Programmatically detect if device has hardware menu button

我添加了这些方法来我的活动。要切换全屏，请使用setFullScreen(!isFullScreen())。

public boolean isFullScreen() { 

    return (getWindow().getAttributes().flags & 
     WindowManager.LayoutParams.FLAG_FULLSCREEN) != 0; 
} 

@SuppressLint("NewApi") 
public void setFullScreen(boolean full) { 

    if (full == isFullScreen()) { 
     return; 
    } 

    Window window = getWindow(); 
    if (full) { 
     window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    } else { 
     window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    } 

    if (Build.VERSION.SDK_INT >= 11) { 
     if (full) { 
      getActionBar().hide(); 
     } else { 
      getActionBar().show(); 
     } 
    } 
} 

就我而言，我希望有一个菜单按钮做切换。问题是：在没有硬件菜单按钮的设备上，隐藏操作栏也隐藏了从全屏返回的切换。所以，我添加了一些额外的逻辑，所以如果设备具有硬件菜单按钮，它只隐藏操作栏。请注意，运行SDK 11-13的设备没有一个。

if (Build.VERSION.SDK_INT >= 14 
     && ViewConfiguration.get(this).hasPermanentMenuKey()))) { 

     if (full) { 
      getActionBar().hide(); 
     } else { 
      getActionBar().show(); 
     } 
    } 

老设备（运行姜饼或更早版本）有一个标题栏，而不是一个操作栏。以下代码将隐藏它，但请注意，一旦活动开始，标题栏就不能显示/隐藏。我在帮助菜单中向用户提供了一条消息，指出全屏更改可能不会在旧设备上完全生效，直到他们重新启动应用程序/活动（当然这假设您只有在需要时才继续选择并执行此代码全屏）。

// call before setContentView() 
    if (Build.VERSION.SDK_INT < 11) { 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
    } 

Answer 3

由于Jellybean（4.1）有一个不依赖于WindowManager的新方法。相反，使用setSystemUiVisibility关闭窗口，这比使用WindowManager标志可以更精确地控制系统栏。这是你如何启用全屏：

if (Build.VERSION.SDK_INT < 16) { //ye olde method 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
        WindowManager.LayoutParams.FLAG_FULLSCREEN); 
} else { // Jellybean and up, new hotness 
    View decorView = getWindow().getDecorView(); 
    // Hide the status bar. 
    int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN; 
    decorView.setSystemUiVisibility(uiOptions); 
    // Remember that you should never show the action bar if the 
    // status bar is hidden, so hide that too if necessary. 
    ActionBar actionBar = getActionBar(); 
    actionBar.hide(); 
} 

这就是你如何恢复上面的代码：

if (Build.VERSION.SDK_INT < 16) { //ye olde method 
    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
} else { // Jellybean and up, new hotness 
    View decorView = getWindow().getDecorView(); 
    // Hide the status bar. 
    int uiOptions = View.SYSTEM_UI_FLAG_VISIBLE; 
    decorView.setSystemUiVisibility(uiOptions); 
    // Remember that you should never show the action bar if the 
    // status bar is hidden, so hide that too if necessary. 
    ActionBar actionBar = getActionBar(); 
    actionBar.show(); 
} 

Answer 4

有一个较短的切换全屏方法实现：

private void toggleFullscreen() { 
    WindowManager.LayoutParams attrs = getWindow().getAttributes(); 
    attrs.flags ^= WindowManager.LayoutParams.FLAG_FULLSCREEN; 
    getWindow().setAttributes(attrs); 
} 

它采用逐位异或逻辑切换FLAG_FULLSCREEN。

Answer 5

/** 
* toggles fullscreen mode 
* <br/> 
* REQUIRE: android:configChanges="orientation|screenSize" 
* <pre> 
* sample: 
*  private boolean fullscreen; 
*  ................ 
*  Activity activity = (Activity)context; 
*  toggleFullscreen(activity, !fullscreen); 
*  fullscreen = !fullscreen; 
* </pre> 
*/ 
private void toggleFullscreen(Activity activity, boolean fullscreen) { 
    if (Build.VERSION.SDK_INT >= 11) { 
     // The UI options currently enabled are represented by a bitfield. 
     // getSystemUiVisibility() gives us that bitfield. 
     int uiOptions = activity.getWindow().getDecorView().getSystemUiVisibility(); 
     int newUiOptions = uiOptions; 
     boolean isImmersiveModeEnabled = 
       ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions); 
     if (isImmersiveModeEnabled) { 
      Log.i(context.getPackageName(), "Turning immersive mode mode off. "); 
     } else { 
      Log.i(context.getPackageName(), "Turning immersive mode mode on."); 
     } 

     // Navigation bar hiding: Backwards compatible to ICS. 
     if (Build.VERSION.SDK_INT >= 14) { 
      newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION; 
     } 

     // Status bar hiding: Backwards compatible to Jellybean 
     if (Build.VERSION.SDK_INT >= 16) { 
      newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN; 
     } 

     // Immersive mode: Backward compatible to KitKat. 
     // Note that this flag doesn't do anything by itself, it only augments the behavior 
     // of HIDE_NAVIGATION and FLAG_FULLSCREEN. For the purposes of this sample 
     // all three flags are being toggled together. 
     // Note that there are two immersive mode UI flags, one of which is referred to as "sticky". 
     // Sticky immersive mode differs in that it makes the navigation and status bars 
     // semi-transparent, and the UI flag does not get cleared when the user interacts with 
     // the screen. 
     if (Build.VERSION.SDK_INT >= 18) { 
      newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY; 
     } 
     activity.getWindow().getDecorView().setSystemUiVisibility(newUiOptions); 
    } else { 
     // for android pre 11 
     WindowManager.LayoutParams attrs = activity.getWindow().getAttributes(); 
     if (fullscreen) { 
      attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN; 
     } else { 
      attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN; 
     } 
     activity.getWindow().setAttributes(attrs); 
    } 

    try { 
     // hide actionbar 
     if (activity instanceof ActionBarActivity) { 
      if (fullscreen) ((ActionBarActivity) activity).getSupportActionBar().hide(); 
      else ((ActionBarActivity) activity).getSupportActionBar().show(); 
     } else if (Build.VERSION.SDK_INT >= 11) { 
      if (fullscreen) activity.getActionBar().hide(); 
      else activity.getActionBar().show(); 
     } 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    // set landscape 
    // if(fullscreen) activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE); 
    // else activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT); 
} 

我的代码在Android 2.3和4.4下正常工作。2