android webview 键盘弹出,Android webview input标签 软键盘遮挡问题

在App中使用Webview中的网页使用了input标签，用于选择文件并且上传；

问题：

点击input标签 后软键盘出现，但是整体布局未向上移动，造成软键盘遮挡put标签等。

解决方案：

简单来说就是使用AndroidBug5497Workaround 类，在onCreate时设置

虚拟按键出现问题

设备：红米redmi 5 plus

类似红米5 plus 这样的设备底部可能有虚拟按键，并且加载的网页十分特殊，网页底部有一个pop，如图

image

在使用AndroidBug5497Workaround 出现pop(红框部分)被底部的虚拟键(蓝框部分)遮挡。

解决方案

* 为修复WebView内的input 弹出软键盘导致布局被遮挡引入

* https://stackoverflow.com/questions/7417123/android-how-to-adjust-layout-in-full-screen-mode-when-softkeyboard-is-visible/19494006#19494006

*/

public class AndroidBug5497Workaround {

// For more information, see https://issuetracker.google.com/issues/36911528

// 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 int frameLayoutHeight = 0;

private void possiblyResizeChildOfContent() {

int usableHeightNow = computeUsableHeight();

if (usableHeightNow != usableHeightPrevious) {

int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();

int heightDifference = usableHeightSansKeyboard - usableHeightNow;

if (heightDifference > (usableHeightSansKeyboard/4)) {

// keyboard probably just became visible

frameLayoutHeight = frameLayoutParams.height;// ！！！修改前保存原有高度

frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;

} else {

// keyboard probably just became hidden

if(0 != frameLayoutHeight) {

frameLayoutParams.height = frameLayoutHeight;// ！！！收起键盘恢复原有高度

}

}

mChildOfContent.requestLayout();

usableHeightPrevious = usableHeightNow;

}

}

private int computeUsableHeight() {

Rect r = new Rect();

mChildOfContent.getWindowVisibleDisplayFrame(r);

return (r.bottom - r.top);

}

}```