android webview监听软键盘弹出和隐藏来修改虚拟导航栏颜色

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u010648159/article/details/83546055

最近项目中用到了webview，然后里面有输入框，当我们点击输入框的时候，软键盘挡住了布局，这就尴尬了，并且产品说，只有在软键盘弹出的时候底部的虚拟导航栏为黑色，软键盘隐藏的时候虚拟导航栏应该也隐藏。网上搜了很多资料和博客，最终把几篇有价值的贴上，并且附上源码。

public class AndroidBug5497Workaround {

	// For more information, see
	// https://code.google.com/p/android/issues/detail?id=5497
	// To use this class, simply invoke assistActivity() on an Activity that already
	// has its content view set.

	public static void assistActivity(Activity activity) {
		new AndroidBug5497Workaround(activity);
	}

	private View						mChildOfContent;

	private int							usableHeightPrevious;

	private FrameLayout.LayoutParams	frameLayoutParams;

	private AndroidBug5497Workaround(final Activity activity) {
		FrameLayout content = activity.findViewById(android.R.id.content);
		mChildOfContent = content.getChildAt(0);
		mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

			public void onGlobalLayout() {
				possiblyResizeChildOfContent(activity);
			}
		});
		frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
	}

	private void possiblyResizeChildOfContent(Activity activity) {
		int usableHeightNow = computeUsableHeight();
		if (usableHeightNow != usableHeightPrevious) {
			int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
			int heightDifference = usableHeightSansKeyboard - usableHeightNow;
			if (heightDifference > (usableHeightSansKeyboard / 4)) {
				// keyboard probably just became visible
				frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
				PhoneUtils.setBottomNavigationColor(activity);
			} else {
				// keyboard probably just became hidden
				frameLayoutParams.height = usableHeightSansKeyboard;
				PhoneUtils.hideVirtualNavigation(activity);
			}
			mChildOfContent.requestLayout();
			usableHeightPrevious = usableHeightNow;
		}
	}



	private int computeUsableHeight() {
		Rect r = new Rect();
		mChildOfContent.getWindowVisibleDisplayFrame(r);
		return (r.bottom - r.top);// 全屏模式下： return r.bottom
	}

}

public class PhoneUtils {
	/***
	 * 显示底部虚拟按键的颜色
	 * 
	 * @param activity
	 */
	public static void setBottomNavigationColor(Activity activity) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
			Window window = activity.getWindow();
			window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
			window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
			window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
			window.setNavigationBarColor(Color.BLACK);
		}
	}

	/***
	 * 隐藏虚拟按键
	 * 
	 * @param activity
	 */
	public static void hideVirtualNavigation(Activity activity) {
		if (hasNavBar(activity.getApplicationContext())) {
			hideBottomUIMenu(activity);
		}
	}

	/**
	 * 隐藏虚拟按键，并且全屏
	 */
	private static void hideBottomUIMenu(Activity activity) {
		// 隐藏虚拟按键，并且全屏
		if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
			View v = activity.getWindow().getDecorView();
			v.setSystemUiVisibility(View.GONE);
		} else if (Build.VERSION.SDK_INT >= 19) {
			// for new api versions.
			View decorView = activity.getWindow().getDecorView();

			int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE;

			decorView.setSystemUiVisibility(uiOptions);
			activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
		}
	}

	/**
	 * 检查是否存在虚拟按键栏
	 *
	 * @param context
	 * @return
	 */
	private static boolean hasNavBar(Context context) {
		Resources res = context.getResources();
		int resourceId = res.getIdentifier("config_showNavigationBar", "bool", "android");
		if (resourceId != 0) {
			boolean hasNav = res.getBoolean(resourceId);
			// check override flag
			String sNavBarOverride = getNavBarOverride();
			if ("1".equals(sNavBarOverride)) {
				hasNav = false;
			} else if ("0".equals(sNavBarOverride)) {
				hasNav = true;
			}
			return hasNav;
		} else { // fallback
			return !ViewConfiguration.get(context).hasPermanentMenuKey();
		}
	}

	/**
	 * 判断虚拟按键栏是否重写
	 *
	 * @return
	 */
	private static String getNavBarOverride() {
		String sNavBarOverride = null;
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
			try {
				Class c = Class.forName("android.os.SystemProperties");
				Method m = c.getDeclaredMethod("get", String.class);
				m.setAccessible(true);
				sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
			} catch (Throwable e) {
			}
		}
		return sNavBarOverride;
	}
}

thanks
webview 软键盘挡住问题
虚拟按键修改颜色
隐藏虚拟按键