解决EditText被软键盘覆盖的问题

1、添加类AndroidBug5497Workaround：

public class AndroidBug5497Workaround {

    public static void assistActivity(View content) {
        new AndroidBug5497Workaround(content);
    }

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

    private AndroidBug5497Workaround(View content) {
        if (content != null) {
            mChildOfContent = content;
            mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                public void onGlobalLayout() {
                    possiblyResizeChildOfContent();
                }
            });
            frameLayoutParams = mChildOfContent.getLayoutParams();
        }
    }

    private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            //如果两次高度不一致
            //将计算的可视高度设置成视图的高度
            frameLayoutParams.height = usableHeightNow;
            mChildOfContent.requestLayout();//请求重新布局
            usableHeightPrevious = usableHeightNow;
        }
    }

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

2、在Activity的onCreate方法中的setContentView后面加上如下代码：

AndroidBug5497Workaround.assistActivity(findViewById(android.R.id.content));

该方案的原理是，给界面的根布局设置一个监听器，当界面大小有变化的时候，如键盘弹出的时候，重新设置一下根布局的高度，再调用requestLayout对界面进行重绘。