Android虚拟按键的适配

华为等手机底部带有虚拟按键，会遮挡app的底部，针对这个问题网上有一些解决方案，但都不是很完美，或多或少存在一些问题。

下面推荐一个比较完美的适配方式。

public class AndroidWorkaround {
    public static void assistActivity(View content) {
        new AndroidWorkaround(content);
    }

    private View mChildOfContent;
    private int usableHeightPrevious;
    private ViewGroup.LayoutParams frameLayoutParams;

    private AndroidWorkaround(View content) {
        mChildOfContent = content;
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                possiblyResizeChildOfContent();
            }
        });
        frameLayoutParams = mChildOfContent.getLayoutParams();
    }

    private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {

            frameLayoutParams.height = usableHeightNow;
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }

    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom);
    }

    public static boolean checkDeviceHasNavigationBar(Context context) {
        boolean hasNavigationBar = false;
        Resources rs = context.getResources();
        int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");
        if (id > 0) {
            hasNavigationBar = rs.getBoolean(id);
        }
        try {
            Class systemPropertiesClass = Class.forName("android.os.SystemProperties");
            Method m = systemPropertiesClass.getMethod("get", String.class);
            String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys");
            if ("1".equals(navBarOverride)) {
                hasNavigationBar = false;
            } else if ("0".equals(navBarOverride)) {
                hasNavigationBar = true;
            }
        } catch (Exception e) {

}
return hasNavigationBar;

}

随后在activity的setContentView后调用即可

setContentView(R.layout.activity_main);
//适配虚拟按键
if (AndroidWorkaround.checkDeviceHasNavigationBar(this)) {
AndroidWorkaround.assistActivity(findViewById(android.R.id.content));
}

以上转载：https://blog.csdn.net/wuhongjie24/article/details/80987142的文章，自己项目中亲测有效，供各位码友参考。

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