Question

我试图通过android程序确定软导航栏。我找不到直接判断的方法。无论如何都有找到导航栏的可用性。

软导航栏图像就在这里。

enter image description here

Answer 1

以下方法适用于我并在许多设备中进行了测试。

public boolean hasNavBar (Resources resources)
    {
        int id = resources.getIdentifier("config_showNavigationBar", "bool", "android");
        return id > 0 && resources.getBoolean(id);
    }

注意：在真实设备中验证此方法

Answer 2

据我所知，您可以通过

检测到它

boolean hasSoftKey = ViewConfiguration.get(context).hasPermanentMenuKey();

但它需要API 14 +

如果上述解决方案对您不起作用，请尝试以下方法

public boolean isNavigationBarAvailable(){

        boolean hasBackKey = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
        boolean hasHomeKey = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_HOME);

        return (!(hasBackKey && hasHomeKey));
    }

Answer 3

它是一个黑客，但它工作正常。试试吧。

public static boolean hasSoftKeys(WindowManager windowManager){
  Display d = windowManager.getDefaultDisplay();

  DisplayMetrics realDisplayMetrics = new DisplayMetrics();
  d.getRealMetrics(realDisplayMetrics);  

  int realHeight = realDisplayMetrics.heightPixels;
  int realWidth = realDisplayMetrics.widthPixels;

  DisplayMetrics displayMetrics = new DisplayMetrics();
  d.getMetrics(displayMetrics);

  int displayHeight = displayMetrics.heightPixels;
  int displayWidth = displayMetrics.widthPixels;

  return (realWidth - displayWidth) > 0 || (realHeight - displayHeight) > 0;
}

Answer 4

The accepted answer应该可以在大多数真实设备上正常工作，但它在模拟器中不起作用。

但是，在Android 4.0及更高版本中，还有一个内部API也适用于模拟器：IWindowManager.hasNavigationBar()。您可以使用反射访问它：

/**
 * Returns {@code null} if this couldn't be determined.
 */
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
@SuppressLint("PrivateApi")
public static Boolean hasNavigationBar() {
    try {
        Class<?> serviceManager = Class.forName("android.os.ServiceManager");
        IBinder serviceBinder = (IBinder)serviceManager.getMethod("getService", String.class).invoke(serviceManager, "window");
        Class<?> stub = Class.forName("android.view.IWindowManager$Stub");
        Object windowManagerService = stub.getMethod("asInterface", IBinder.class).invoke(stub, serviceBinder);
        Method hasNavigationBar = windowManagerService.getClass().getMethod("hasNavigationBar");
        return (boolean)hasNavigationBar.invoke(windowManagerService);
    } catch (ClassNotFoundException | ClassCastException | NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
        Log.w("YOUR_TAG_HERE", "Couldn't determine whether the device has a navigation bar", e);
        return null;
    }
}

Answer 5

尝试使用此方法，您可以检测导航栏是否存在。

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
public boolean hasNavBar(Context context) {
    Point realSize = new Point();
    Point screenSize = new Point();
    boolean hasNavBar = false;
    DisplayMetrics metrics = new DisplayMetrics();
    this.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
    realSize.x = metrics.widthPixels;
    realSize.y = metrics.heightPixels;
    getWindowManager().getDefaultDisplay().getSize(screenSize);
    if (realSize.y != screenSize.y) {
        int difference = realSize.y - screenSize.y;
        int navBarHeight = 0;
        Resources resources = context.getResources();
        int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId > 0) {
            navBarHeight = resources.getDimensionPixelSize(resourceId);
        }
        if (navBarHeight != 0) {
            if (difference == navBarHeight) {
                hasNavBar = true;
            }
        }

    }
    return hasNavBar;

}

Answer 6

其他答案对我没有帮助。但是知道是否显示导航栏非常有用，尤其是在Android P / Q之后，用户可以在其中滑动屏幕。我遇到了这篇文章https://blog.stylingandroid.com/gesture-navigation-window-insets/，并提出了这样的方法

fun hasNavBar(activity: Activity): Boolean {
    val temporaryHidden = activity.window.decorView.visibility and View.SYSTEM_UI_FLAG_HIDE_NAVIGATION != 0
    if (temporaryHidden) return false
    val decorView = activity.window.decorView
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        decorView.rootWindowInsets?.let{
            return it.stableInsetBottom != 0
        }
    }
    return true
}

Answer 7

正确的答案和其他答案现在都不实际。
存在一些选项，例如“全屏显示->全屏手势”，其中隐藏了导航栏，但所有这些方法都返回他的存在。

我建议您使用这种方式检查系统视图的大小。在 onCreate 方法中：

ViewCompat.setOnApplyWindowInsetsListener(findViewById(android.R.id.content), 
  (v, insets) -> { 
      int navigationBarHeight = insets.getSystemWindowInsetBottom();
      return insets;
  });

以编程方式检测Android设备中的软导航栏可用性？

7 个答案: