当它在
Android 4.4上运行时,我在我的应用程序中使用沉浸式模式. (
http://developer.android.com/training/system-ui/immersive.html)
我的活动确实以全屏显示,我通过使用setOnsystemUIVisibilityChangeListener来解决音量键问题.我也有类似的代码将对话框放入沉浸式模式.
但是,当显示对话框时,导航.酒吧跳到屏幕上,然后立即撤退.当对话框被解除时,情况更糟 – 导航.酒吧跳跃并调整背后的活动.
以下是我的支持沉浸式模式的课程.它只是在每个Activity的onResume上调用,并且在构建每个对话框时也会调用一个单独的函数.
我错过了任何旗帜或回调,还是已知的Android问题？
public class ImmersiveModeHelper {
public ImmersiveModeHelper(Activity activity)
{
mActivity = activity;
}
@SuppressLint("NewApi")
public void supportFullScreenImmersiveMode()
{
MyLog.d("ImmersiveModeHelper: supportFullScreenImmersiveMode: ");
// Support full-screen immersive mode on Android 4.4 and up
if (Build.VERSION.SDK_INT >= 19)
{
// Get the needed flags by reflection and use them
try
{
final int immersiveFlag = View.class.getField("SYSTEM_UI_FLAG_IMMERSIVE_STICKY")
.getInt(null);
final int hideNavigationFlag = View.class
.getField("SYSTEM_UI_FLAG_HIDE_NAVIGATION").getInt(null);
final int fullScreenFlag = View.class.getField("SYSTEM_UI_FLAG_FULLSCREEN").getInt(
null);
// Set the flags to the window decor view
mActivity.getWindow().getDecorView()
.setsystemUIVisibility(immersiveFlag | hideNavigationFlag | fullScreenFlag);
// Set a callback to be called when visibility changes
// (workaround
// for volume keys)
mActivity
.getWindow()
.getDecorView()
.setOnsystemUIVisibilityChangeListener(
new View.OnsystemUIVisibilityChangeListener()
{
@Override
public void onsystemUIVisibilityChange(int visibility)
{
MyLog.d("ImmersiveModeHelper.supportFullScreenImmersiveMode().new OnsystemUIVisibilityChangeListener() {...}: onsystemUIVisibilityChange: " +
"");
if ((visibility & (immersiveFlag | hideNavigationFlag)) == 0)
{
Handler uiHandler = UiThreadUtils.getUiHandler();
uiHandler.removeCallbacks(mHidesystemUICallback);
uiHandler.postDelayed(mHidesystemUICallback,HIDE_SYSTEM_UI_DELAY_MILLI);
}
}
});
} catch (Exception e)
{
e.printStackTrace();
MyLog.e("ImmersiveModeHelper: supportFullScreenImmersiveMode: couldn't support immersive mode by reflection");
}
} else
{
MyLog.i("ImmersiveModeHelper: supportFullScreenImmersiveMode: not supported on this platform version");
}
}
public static void supportFullScreenImmersiveModeForDialog(final Dialog dlg)
{
MyLog.d("ImmersiveModeHelper: supportFullScreenImmersiveModeForDialog: ");
// Support full-screen immersive mode on Android 4.4 and up
if (Build.VERSION.SDK_INT >= 19)
{
final Window dlgWindow = dlg.getWindow();
// Get the needed flags by reflection and use them
try
{
final int immersiveFlag = View.class.getField("SYSTEM_UI_FLAG_IMMERSIVE_STICKY")
.getInt(null);
final int hideNavigationFlag = View.class
.getField("SYSTEM_UI_FLAG_HIDE_NAVIGATION").getInt(null);
final int fullScreenFlag = View.class.getField("SYSTEM_UI_FLAG_FULLSCREEN").getInt(
null);
// Set the flags to the window decor view
int flags = dlgWindow.getDecorView().getsystemUIVisibility();
flags |= (immersiveFlag | hideNavigationFlag | fullScreenFlag);
dlgWindow.getDecorView().setsystemUIVisibility(flags);
// Set a callback to be called when visibility changes
// (workaround for volume keys)
dlgWindow.getDecorView().setOnsystemUIVisibilityChangeListener(
new View.OnsystemUIVisibilityChangeListener()
{
@Override
public void onsystemUIVisibilityChange(int visibility)
{
MyLog.d("ImmersiveModeHelper.supportFullScreenImmersiveModeForDialog(...).new OnsystemUIVisibilityChangeListener() {...}: onsystemUIVisibilityChange: ");
if ((visibility & (immersiveFlag | hideNavigationFlag)) == 0)
{
Runnable hidesystemUICallback = new Runnable()
{
@Override
public void run()
{
supportFullScreenImmersiveModeForDialog(dlg);
}
};
Handler uiHandler = UiThreadUtils.getUiHandler();
uiHandler.removeCallbacks(hidesystemUICallback);
uiHandler.postDelayed(hidesystemUICallback,HIDE_SYSTEM_UI_DELAY_MILLI);
}
}
});
} catch (Exception e)
{
e.printStackTrace();
MyLog.e("ImmersiveModeHelper: supportFullScreenImmersiveMode: couldn't support immersive mode by reflection");
}
} else
{
MyLog.i("ImmersiveModeHelper: supportFullScreenImmersiveMode: not supported on this platform version");
}
}
private Activity mActivity;
private Runnable mHidesystemUICallback = new Runnable()
{
@Override
public void run()
{
supportFullScreenImmersiveMode();
}
};
private static final int HIDE_SYSTEM_UI_DELAY_MILLI = 0;
}
解决方法
来自Google API：
最好包括其他系统UI标志(例如SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION和SYSTEM_UI_FLAG_LAYOUT_STABLE),以防止系统栏隐藏和显示时调整内容大小.
最好包括其他系统UI标志(例如SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION和SYSTEM_UI_FLAG_LAYOUT_STABLE),以防止系统栏隐藏和显示时调整内容大小.
您还应确保同时隐藏操作栏和其他UI控件.此代码段演示了如何隐藏和显示状态和导航栏,而无需调整内容大小：
// This snippet hides the system bars. private void hidesystemUI() { // Set the IMMERSIVE flag. // Set the content to appear under the system bars so that the content // doesn't resize when the system bars hide and show. mDecorView.setsystemUIVisibility( View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar | View.SYSTEM_UI_FLAG_IMMERSIVE); } // This snippet shows the system bars. It does this by removing all the flags // except for the ones that make the content appear under the system bars. private void showsystemUI() { mDecorView.setsystemUIVisibility( View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN); }
希望这可以帮助.
