Android适配底部虚拟键盘遮挡布局的解决方案

public class AndroidBug54971Workaround {
    // 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(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;
        }
    }

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

使用：

//setContentView之后
AndroidBug54971Workaround.assistActivity(findViewById(android.R.id.content));