全面屏时代，android设备已经很少有键盘的存在了，为了便捷，虚拟按键应运而生，当然iphone的手势控制也有一部分厂商移植到了android系统中。
本文主要是关于底部的三个虚拟按键RECENT、HOME、BACK对于第三方APK如何隐藏。
View.java的API显示，三个虚拟按键都是hide，即只有系统APK可以调用：
/*** @hide** NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked* out of the public fields to keep the undefined bits out of the developer's way.** Flag to hide only the recent apps button. Don't use this* unless you're a special part of the system UI (i.e., setup wizard, keyguard).*/public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000;/*** @hide** NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked* out of the public fields to keep the undefined bits out of the developer's way.** Flag to hide only the home button. Don't use this* unless you're a special part of the system UI (i.e., setup wizard, keyguard).*/public static final int STATUS_BAR_DISABLE_HOME = 0x00200000;/*** @hide** NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked* out of the public fields to keep the undefined bits out of the developer's way.** Flag to hide only the back button. Don't use this* unless you're a special part of the system UI (i.e., setup wizard, keyguard).*/public static final int STATUS_BAR_DISABLE_BACK = 0x00400000;
那第三方APK如何控制呢？
// 定义与API中相同的数值private static final int STATUS_BAR_DISABLE_RECENT = 0x01000000;private static final int STATUS_BAR_DISABLE_HOME = 0x00200000;private static final int STATUS_BAR_DISABLE_BACK = 0x00400000;@Overrideprotected void onCreate(Bundle icicle) {super.onCreate(icicle);...int flags = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;KeyguardManager mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);flags |= STATUS_BAR_DISABLE_RECENT;Log.i(TAG, "disable recent!");getWindow().getDecorView().setSystemUiVisibility(flags);...}
示例显示了如何隐藏RECENT虚拟按键。
