blocks|key|2163273|text|我知道你可以通过|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2163274|boolean+hasSoftKey+=+ViewConfiguration.get(context).hasPermanentMenuKey();|code-block|syntax|javascript|2163275|，但它需要API+14%2B|offset|length|style|BOLD|2163276|如果上述解决方案对您无效，请尝试以下方法|2163277|public+boolean+isNavigationBarAvailable(){

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

++++++++return+(!(hasBackKey+&&+hasHomeKey));
++++}|2163278|entityMap^0|0|0|0|C|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

As i know you can detect it by 

<pre><code>boolean hasSoftKey = ViewConfiguration.get(context).hasPermanentMenuKey();
</code></pre>

But it required APIs 14+

<hr>

If above solution doesn't work for you then try below method

<pre><code>public boolean isNavigationBarAvailable(){

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

 return (!(hasBackKey &amp;&amp; hasHomeKey));
 }
</code></pre>

blocks|key|2163283|text|这是一次黑客攻击，但效果很好。试试看。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2163284|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+%7C%7C+(realHeight+-+displayHeight)+>+0;
}|code-block|syntax|javascript|2163285|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Its a hack but it works fine. Try it.

<pre><code>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) &gt; 0 || (realHeight - displayHeight) &gt; 0;
}
</code></pre>

blocks|key|866559|text|下面的方法对我有效，并在许多设备上进行了测试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|866560|public+boolean+hasNavBar+(Resources+resources)
++++{
++++++++int+id+=+resources.getIdentifier("config_showNavigationBar",+"bool",+"android");
++++++++return+id+>+0+&&+resources.getBoolean(id);
++++}|code-block|syntax|javascript|866561|注：在实际设备中验证了该方法|offset|length|style|BOLD|866562|entityMap^0|0|0|0|2|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Following method worked for me and tested in many devices.

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

Note: Verified this method in real device

blocks|key|2163324|text|尝试此方法，以这种方式可以检测导航栏是否存在。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2163325|@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;

}|code-block|syntax|javascript|2163326|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this method,in this way you can detect if the navigation bar exist.

<pre><code>@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 &gt; 0) {
 navBarHeight = resources.getDimensionPixelSize(resourceId);
 }
 if (navBarHeight != 0) {
 if (difference == navBarHeight) {
 hasNavBar = true;
 }
 }

 }
 return hasNavBar;

}
</code></pre>

blocks|key|2682597|text|被接受的答案在大多数实际设备上应该运行良好，但它在模拟器中不能工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2682598|然而，在Android4.0和更高版本中，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：|2682599|/**
+*+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+%7C+ClassCastException+%7C+NoSuchMethodException+%7C+SecurityException+%7C+IllegalAccessException+%7C+IllegalArgumentException+%7C+InvocationTargetException+e)+{
++++++++Log.w("YOUR_TAG_HERE",+"Couldn't+determine+whether+the+device+has+a+navigation+bar",+e);
++++++++return+null;
++++}
}|code-block|syntax|javascript|2682600|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/32698387/238753|1|https://github.com/android/platform_frameworks_base/blob/124460817263f5449d59a4345ab24dde82645bd9/services/core/java/com/android/server/policy/PhoneWindowManager.java#L7869^0|0|6|0|0|11|X|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

<a href="https://stackoverflow.com/a/32698387/238753">The accepted answer</a> should work fine on most real devices, but it doesn't work in the emulators.

However, in Android 4.0 and above, there's an internal API that also works on the emulators: <a href="https://github.com/android/platform_frameworks_base/blob/124460817263f5449d59a4345ab24dde82645bd9/services/core/java/com/android/server/policy/PhoneWindowManager.java#L7869" rel="noreferrer">IWindowManager.hasNavigationBar()</a>. You can access it using reflection:

<pre><code>/**
 * Returns {@code null} if this couldn't be determined.
 */
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
@SuppressLint("PrivateApi")
public static Boolean hasNavigationBar() {
 try {
 Class&lt;?&gt; serviceManager = Class.forName("android.os.ServiceManager");
 IBinder serviceBinder = (IBinder)serviceManager.getMethod("getService", String.class).invoke(serviceManager, "window");
 Class&lt;?&gt; 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;
 }
}
</code></pre>

blocks|key|2163372|text|其他的答案帮不了我。但是，知道导航栏是否显示是非常有用的，特别是在Android+/Q之后，用户可以在屏幕外滑动导航栏。我遇到过这篇文章https://blog.stylingandroid.com/gesture-navigation-window-insets/，并做了这样的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2163373|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
}|code-block|syntax|javascript|2163374|entityMap|0|LINK|mutability|MUTABLE|url|https://blog.stylingandroid.com/gesture-navigation-window-insets/^0|1W|1T|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Other answers don't help me. But it's quite useful to know if navigation bar is shown, especially after Android P/Q, where user can swipe it out of screen. I've encounter this article <a href="https://blog.stylingandroid.com/gesture-navigation-window-insets/" rel="nofollow noreferrer">https://blog.stylingandroid.com/gesture-navigation-window-insets/</a> and made such method 

<pre><code>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 &gt;= Build.VERSION_CODES.M) {
 decorView.rootWindowInsets?.let{
 return it.stableInsetBottom != 0
 }
 }
 return true
}
</code></pre>

blocks|key|2163415|text|正确的答案和其他现在都不是实际的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2163416|有一些选项，如‘全屏显示->全屏手势’，其中导航栏是隐藏的，但所有这些方法返回他的存在。|2163417|我建议您使用这种方式检查系统视图的大小。在onCreate方法中：|2163418|ViewCompat.setOnApplyWindowInsetsListener(findViewById(android.R.id.content),+
++(v,+insets)+->+{+
++++++int+navigationBarHeight+=+insets.getSystemWindowInsetBottom();
++++++return+insets;
++});|code-block|syntax|javascript|2163419|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Right answer and other are not actual now. 
There are exist some options like 'Full Screen Display -> Full Screen Gestures' where navigation bar is hidden but all this methods returns that he is present.

I suggest you to use this way to check size of system views.
In onCreate method:

<pre><code>ViewCompat.setOnApplyWindowInsetsListener(findViewById(android.R.id.content), 
 (v, insets) -&gt; { 
 int navigationBarHeight = insets.getSystemWindowInsetBottom();
 return insets;
 });
</code></pre>

blocks|key|866698|text|查找是否启用软导航的目的是确定所提供窗口的大小，并根据以下内容设置布局。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|866699|有一个非常强大的工具叫做decorView，它从以前设置窗口，以便直接在它下面实现方法。它可以写成这样：|offset|length|style|CODE|866700|val+decorView+=+window.decorView
decorView.systemUiVisibility+=+View.SYSTEM_UI_FLAG_LAYOUT_STABLE|code-block|syntax|javascript|866701|只要开始在它下面写方法，不管你想在框架内做什么。|866702|在尝试了大量的方法和技巧之后，才发现这个方法是有效的，而这个方法和技巧是唯一起作用的。|866703|entityMap^0|0|C|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

The point of finding the soft navigation enabled or not is to determine what is the size of the window provided and to set the layout according to.
There is a very powerful tool called <code>decorView</code> that sets the window from before so as to directly implement methods under it. It can be written like this:
<pre class="lang-java prettyprint-override"><code>val decorView = window.decorView
decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
</code></pre>
Just start writing methods under it whichever you want to make inside the frame.
Found this one working after trying a ton of methods and tricks and this one is the only one working.

I am trying to determine soft navigation bar through the android program. I didn't find straight way to determine. Is there anyway to find the navigation bar availability. 

Soft Navigation bar image is here.

<img src="https://i.stack.imgur.com/grH4i.png" alt="enter image description here">

How to detect bottom soft navigation bar available in android programmatically?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正试图通过android程序来确定软导航栏。我没有找到直接的方法来确定。是否有找到导航栏的可用性。软导航条图像在这里。​​

问如何以编程方式检测android中可用的底部软导航条？
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问如何以编程方式检测android中可用的底部软导航条？
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