Android登陆页面仿拉钩动效，你总会需要它!

view.View;

import android.view.ViewTreeObserver;

import android.widget.FrameLayout;

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(Activity activity) {

FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);

mChildOfContent = content.getChildAt(0);

mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

public void onGlobalLayout() {

possiblyResizeChildOfContent();

}

});

frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();

}

private void possiblyResizeChildOfContent() {

int usableHeightNow = computeUsableHeight();

if (usableHeightNow != usableHeightPrevious) {

int

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