AndroidBug5497Workaround (用我这个就够了)

最新推荐文章于 2024-06-06 10:05:14 发布

原创最新推荐文章于 2024-06-06 10:05:14 发布 · 2.5k 阅读

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#java #开发语言

本文介绍了一个针对AndroidWebView中软键盘遮挡输入框的解决方案，通过AndroidBug5497Workaround类，监听输入框的全局布局变化，动态调整布局以适应键盘显示/隐藏，提供简单易用的在ActivityonCreate中的集成示例。

webview加载网页『软键盘挡住了输入框』,是因为安卓本身的bug,即AndroidBug5497Workaround ;

关于5497的问题,网上也是杂七杂八给了各种方案,试了一天,用我这个方案完美解决问题,所以被5497问题困扰的话,直接copy吧

/**
 * 解决WebView中输入时弹出软键盘，挡住输入框的问题
 */

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);
    }
}

使用方法也很简单就是在 webactivity 的 onCreate的方法里直接调用

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_iweb);
        AndroidBug5497Workaround.assistActivity(this);
    }