我有一个基于单个 Activity 和多个 fragment 的应用程序，有些 fragment 需要在进入 fragment 时显示为全屏，并在退出时从全屏退出。我目前正在使用标志在 Android Kitkat 中显示全屏，但我认为这不是最佳方式。我还阅读了 ImmersiveMode 但它在较低的 Android 版本中不起作用。目前我正在使用这些方法进行全屏进入和退出。
//This method not showing transparent status bar also navigation bar and not showing system icons either
public static void setFullscreen(Activity activity) {
if (Build.VERSION.SDK_INT > 10) {
int flags = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_FULLSCREEN;
boolean isImmersiveAvailable = android.os.Build.VERSION.SDK_INT >= 19;
if (isImmersiveAvailable) {
flags |= View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
}
activity.getWindow().getDecorView().setSystemUiVisibility(flags);
} else {
activity.getWindow()
.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
}
public static void exitFullscreen(Activity activity) {
if (Build.VERSION.SDK_INT > 10) {
activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
} else {
activity.getWindow()
.setFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
}
}
public static void ShowHideFullscreen(boolean isFullscreen,Context cntx){
int newUiOptions = 0;
if (isFullscreen){
// BEGIN_INCLUDE (get_current_ui_flags)
// The UI options currently enabled are represented by a bitfield.
// getSystemUiVisibility() gives us that bitfield.
int uiOptions = ((Activity)cntx).getWindow().getDecorView().getSystemUiVisibility();
newUiOptions = uiOptions;
// END_INCLUDE (get_current_ui_flags)
// BEGIN_INCLUDE (toggle_ui_flags)
boolean isImmersiveModeEnabled =
((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
if (isImmersiveModeEnabled) {
Log.d(TAG, "Turning immersive mode mode off. ");
} else {
Log.d(TAG, "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)cntx).getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
}else {
((Activity)cntx).getWindow().clearFlags(newUiOptions);
}
}
这些是我们用来在带有隐藏操作栏的 fragment 中进入或退出全屏的方法。我们使用它们在 onCreate 上进入全屏并在 onPause 上退出，但有时它无法显示所需的结果。
我们也需要知道在较低的 API 上显示全屏 fragment 的最佳方式是什么(KITKAT)，以及在显示全屏时隐藏工具栏的最佳方式是什么，因为我们的代码 ((AppCompatActivity)Objects.requireNonNull( getActivity())).getSupportActionBar().hide();
有时会抛出 nullpointerexception。
我们的问题:
- 在全屏 fragment 和透明导航栏上显示带有透明状态栏和绘图系统图标的全屏 fragment 。
- 使用无需获取
NullpointerExepection即可安全调用的方法隐藏和显示工具栏 - 我们可以将 android Kitkat 定位为最低的 android 版本。
带有系统图标和透明导航栏的 fragment 全屏示例。
更新:我在我的 fragment onResume 上设置了 IMMERSIVE 模式，并通过这些方法将其重置回 onStop .
private void hideSystemUI() {
// Enables regular immersive mode.
// For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE.
// Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY
View decorView = getActivity().getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
// Set the content to appear under the system bars so that the
// content doesn't resize when the system bars hide and show.
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
// Hide the nav bar and status bar
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN);
((AppCompatActivity) Objects.requireNonNull(getActivity())).getSupportActionBar().hide();
}
// Shows the system bars by removing all the flags
// except for the ones that make the content appear under the system bars.
private void showSystemUI() {
View decorView = getActivity().getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
((AppCompatActivity) Objects.requireNonNull(getActivity())).getSupportActionBar().show();
}
它以全屏显示我的 fragment 并隐藏状态栏(这不是我想要的)并且我的 fragment 属于 Navigation Drawer。当我从全屏 fragment 按下后退按钮时，它会在上一个 fragment 的工具栏上方显示我的状态栏。
最佳答案
我通过创建一个方法解决了这个问题，该方法在 onStop 清除所需的标志并在 onResume 添加标志
@Override
public void onResume() {
super.onResume();
App_Functions.transparentStatusBar(getActivity(),true,false);
}
@Override
public void onStop() {
super.onStop();
App_Functions.transparentStatusBar(getActivity(),false,false);
}
如果我想显示透明状态栏但导航栏应该相同，那么我在方法的第一个参数中使用 true 并清除该标志只需使用 false。与我使用 true 完全全屏和 false 清除全屏标志的方式相同
public static void transparentStatusBar(Activity activity, boolean isTransparent, boolean fullscreen) {
if (isTransparent){
activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
((AppCompatActivity) Objects.requireNonNull(activity)).getSupportActionBar().hide();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
defaultStatusBarColor = activity.getWindow().getStatusBarColor();
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
// FOR TRANSPARENT NAVIGATION BAR
//activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
Log.d(TAG,"Setting Color Transparent "+Color.TRANSPARENT+ " Default Color "+defaultStatusBarColor);
} else {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
Log.d(TAG,"Setting Color Trans "+Color.TRANSPARENT);
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
}
}else {
if (fullscreen){
View decorView = activity.getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);
}else {
((AppCompatActivity) Objects.requireNonNull(activity)).getSupportActionBar().show();
activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
activity.getWindow().setStatusBarColor(defaultStatusBarColor);
}else {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
}
}
}
}
请随时推荐在所有平台上使用此方法的更好方法。
关于android - 具有透明状态栏的全屏 fragment (以编程方式)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59215711/