Android 解决华为虚拟键冲突遮挡底部按钮

监听某个视图的变化，当可以看见的高度发生变化时，就对这个视图重新布局，保证视图不会被遮挡，也不会浪费屏幕空间。

这一点尤其可用在像华为手机等可以隐藏和显示虚拟键盘上导致屏幕变化的手机上。

这里提供一个工具类：

public class VirturlUtil {
    // 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.

    /**
     * 关联要监听的视图
     *
     * @param viewObserving
     */
    public static void assistActivity(View viewObserving) {
        new AndroidBug54971Workaround(viewObserving);
    }

    private View mViewObserved;//被监听的视图
    private int usableHeightPrevious;//视图变化前的可用高度
    private ViewGroup.LayoutParams frameLayoutParams;

    private AndroidBug54971Workaround(View viewObserving) {
        mViewObserved = viewObserving;
        //给View添加全局的布局监听器
        mViewObserved.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                resetLayoutByUsableHeight(computeUsableHeight());
            }
        });
        frameLayoutParams = mViewObserved.getLayoutParams();
    }

    private void resetLayoutByUsableHeight(int usableHeightNow) {
        //比较布局变化前后的View的可用高度
        if (usableHeightNow != usableHeightPrevious) {
            //如果两次高度不一致
            //将当前的View的可用高度设置成View的实际高度
            frameLayoutParams.height = usableHeightNow;
            mViewObserved.requestLayout();//请求重新布局
            usableHeightPrevious = usableHeightNow;
        }
    }

    /**
     * 计算视图可视高度
     *
     * @return
     */
    private int computeUsableHeight() {
        Rect r = new Rect();
        mViewObserved.getWindowVisibleDisplayFrame(r);
        return (r.bottom);
    }
}

计算可视高度，直接原始bottom

然后在你需要解决这个问题的Activity的onCreate方法的setContentView(R.layout.content_frame);后面添加上

VirturlUtil.assistActivity(findViewById(android.R.id.content));

搞定！